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SMM665C
Six-Channel Active DC Output Controller, Monitor, Marginer and Sequencer
FEATURES & APPLICATIONS
* Extremely accurate (0.2%) Active DC Output Control (ADOCTM) * Undervoltage Lockout function (UVLO) * ADOCTM Automatically adjusts supply output voltage level under all DC load conditions * Monitors, controls, sequences and margins up to six supplies from 0.3V to 5.5V with 1.25V Vref Wide Margin/ADOC range from 0.3V to VDD * Programmable Power-on/-off sequencing * Monitors internal temperature sensor * Operates from any intermediate bus supply from 8V to 15V and from 2.7V to 5.5V * Monitors 12V input and VDD * Monitors two general-purpose 10-bit ADC inputs * Programmable threshold limits (2 OV/2 UV) for each monitored input * Programmable RESET, HEALTHY and FAULT * 4k-bit general purpose nonvolatile memory * I2C 2-wire serial bus for programming configuration and monitoring status, including 10-bit ADC conversion results Applications * Monitor/Control Distributed and POL Supplies * Multi-voltage Processors, DSPs, ASICs used in Telecom, CompactPCI or server systems
INTRODUCTION
The SMM665C is an Active DC Output power supply Controller (ADOCTM) that monitors, margins and cascade sequences. The ADOC feature is unique and maintains extremely accurate settings of system supply voltages to within 0.2% under full load. The device actively controls up to six DC/DC converters that use a Trim or Regulator VADJ/FB pin to adjust the output voltage. For system test, the part also controls margining of the supplies using I2C commands. It can margin supplies with either positive or negative control within a range of 0.3V to VDD depending on the specified range of the converter. The SMM665C also intelligently sequences or cascades the power supplies on and off in any order using enable outputs with programmable polarity. It can operate off any intermediate bus supply ranging from 8V to 15V or from 5.5V to as low as 2.7V. The part monitors six power supply channels as well as VDD, 12V input, two general-purpose analog inputs and an internal temperature sensor using a 10-bit ADC. The 10-bit ADC can measure the value on any one of the monitor channels and output the data via the I2C bus. A host system can communicate with the SMM665C status register, optionally control Power-on/off, margining and utilize 4K-bits of nonvolatile memory.
SIMPLIFIED APPLICATIONS DRAWING
12VIN (+8V to +15V Range) 3.3VIN (+2.7V to +5.5V Range) 12VIN VDD CAPA TRIM_CAPA DC/DC Converter C, E VIN DC/DC Converter A Vout TRIM ON/OFF 2 of 6 DC-DC Converters shown VMA CAPB DC/DC Converter D, F VIN DC/DC Converter B Vout TRIM ON/OFF 12V 3.3V
SDA I2C BUS SCL A2 External or Internal TEMP SENSOR Environ mental SENSOR External or Internal REFERENCE
2.5VIN
TRIMA PUPA
AIN1
SMM665C
AIN2 VREF_CNTL VREF_ADC HEALTHY
TRIM_CAPB
P/ ASIC
1.2VIN
TRIMB PUPB
RST
MR
VMB HEALTHY RESET READY
Figure 1 - Applications Schematic using the SMM665C Controller to actively control the output levels of up to six DC/DC Converters while also providing power on/off, cascade sequencing and output margining.
Note: This is an applications example only. Some pins, components and values are not shown. (c) SUMMIT Microelectronics, Inc. 2006 * 757 N. Mary Avenue * Sunnyvale CA 94085 * Phone 408 523-1000 * FAX 408 523-1266
The Summit Web Site can be accessed by "right" or "left" mouse clicking on the link: http://www.summitmicro.com/ 2125 3.1 7/22/2008 1
SMM665C
VDD (+2.7V to +5.5V) or 12VIN ( +8V to +15V) 2.7V 2.5V 2.0V 1.8V 1.5V
RST#
---
t1 ---
Figure 2 - Example Power Supply Sequencing and System Start-up Initialization using the SMM665C. Any order of supply sequencing can be applied using the SMM665C. Power supply ordering, trimming and Active DC control allows supply cascade sequencing, automatic level adjustment, margin testing and reset control.
GENERAL DESCRIPTION
The SMM665C is a highly integrated and accurate power supply controller, monitor and sequencer. It has the ability to automatically control, monitor and cascade sequence up to six power supplies. Also, the SMM665C can monitor the VDD input, the 12V input, two general-purpose analog inputs and the internal temperature sensor. The SMM665C has four operating modes: Power-on sequencing mode, monitor mode, supply margining mode using Active DC Output Control (ADOCTM), and Power-off sequencing mode. Power-on sequencing can be initiated via the PWR_ON/OFF pin or I2C control. In this mode, the SMM665C will sequence the power supply channels on in any order by activating the PUP outputs and monitoring the respective converter voltages to ensure cascading of the supplies. Cascade sequencing is the ability to hold off the next sequenced supply until the first supply reaches a programmed threshold. A programmable sequence termination timer can be set to disable all channels if the Power-on sequence stalls. Once all supplies have sequenced on and the voltages are above the UV settings, the Active DC Control, if enabled, will bring the supply voltages to their nominal settings. During this mode, the HEALTHY output will remain inactive and the RST output will remain active. Once the Power-on sequencing mode is complete, the SMM665C enters monitor mode. In the monitor mode, the SMM665C starts the ADOC control of the supplies and adjusts the output voltage to the programmed setting under all load conditions, especially useful for supplies without sense lines. Typical converters have 2% accuracy ratings for their output voltage, the Active DC Output Control feature of the SMM665C increases the accuracy to 0.2% (using a 0.1% external voltage reference). The part also enables the triggering of outputs by monitored fault conditions. The 10-bit ADC cycles through all 11 channels every
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2ms and checks the conversions against the programmed threshold limits. The results can be used to trigger RST, HEALTHY and FAULT outputs as well as to trigger a Power-off or a Force Shutdown operation. While the SMM665C is in its monitoring mode, an I2C command to margin the supply voltages can bring the part into margining mode. In margining mode the SMM665C can margin six supply voltages in any combination of nominal, high and low voltage settings using the ADOC feature, all to within 0.2% using a 0.1% external reference. The margin high and low voltage settings can range from 0.3V to VDD around the converters' nominal output voltage setting depending on the specified margin range of the DCDC converter. During this mode the HEALTHY output is always active and the RST output is always inactive regardless of the voltage threshold limit settings and triggers. Furthermore, the triggers for Power-off and Force Shutdown are temporarily disabled. The Power-off sequencing mode can only be entered while the SMM665C is in the monitoring mode. It can be initiated by either bringing the PWR_ON/OFF pin inactive, through I2C control or triggered by a channel exceeding its programmed thresholds. Once Poweroff is initiated, it will disable the Active DC Control and sequence the PUP outputs off in either the same or reverse order as Power-on sequencing and monitor the supply voltages to ensure cascading of the supplies as they turn off. The sequence termination timer can be programmed to immediately disable all channels if the Power-off sequencing stalls. The RST output will remain active throughout this mode while the HEALTHY output remains inactive.
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INTERNAL FUNCTIONAL BLOCK DIAGRAM
12VIN
VDD
VDD_CAP
PWR_ON/OFF FS
VREF_ADC AIN1 AIN2 VM A CAPA
3.6V or 5.5V Regulator
Power Supply Arbitrator UVLO Control Cascade Sequence Control
PUPA PUPB PUPC PUPD PUPE PUPF
10-Bit ADC
Temperature Sensor
VM F MR CAPF RST HEALTHY FAULT TRIM A TRIM_CAPA
Output Control
Active DC Control (ADOCTM)
TRIM F TRIM_CAPF VREF_CNTL FILT_CAP
Memory, Limit and Status Registers
SDA
I2C Interface
SCL A2
GND
Figure 3 - SMM665C Internal Functional Block Diagram.
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PIN DESCRIPTIONS
Pin Number 1 2 3 Pin Type DATA CLK IN Pin Name SDA SCL A2 Pin Description I2C Bi-directional data line I2C Clock line The address pin is biased either to VDD_CAP or GND. When communicating with the SMM665C over the 2-wire bus A2 provides a mechanism for assigning a unique bus address. Programmable active high/low input. When asserted the RST output will be go active. When de-asserted the RST output will go inactive immediately after a reset timeout period (tPRTO) if there are no RST trigger sources active. This timeout period makes it suitable to use a pushbutton for manual reset. Programmable active high/low input signals the start of the power sequencing. When asserted the part will sequence the supplies on and when de-asserted the part will sequence the supplies off. Note: The SMM665C does not monitor for faults during sequencing. The PWR_ON/OFF pin is overridden by the I2C power on/off command. To get the pin to work again requires the part be given an I2C 'Clear' command (see page 14, "RESTART OF POWER-ON CASCADE SEQUENCING"). Programmable active high/low input. Force shutdown is used to immediately turn off all converter enable signals (PUP outputs) when a fault is detected. Programmable active high/low open drain Fault output. Active when a programmed fault condition exists on AIN1, AIN2, or the internal temperature sensor. Programmable active high/low open drain Healthy output. Active when all programmed power supply inputs and monitored inputs are within OV and UV limits. Programmable active high/low open drain Reset output. Active when a programmed fault condition exists on any power supply inputs or monitored inputs or when MR is active. RST has a programmable timeout period with options for 0.64ms, 25ms, 100ms and 200ms. General purpose monitored analog input General purpose monitored analog input Ground Voltage reference input used for A/D conversion where: (4XVREF_ADC) = Full Scale (FS) for VMA-F and VDD (12XVREF_ADC) = FS for 12VIN (2XVREF_ADC) = FS for AIN1 and AIN2. VREF_ADC can be connected to VREF_CNTL in most applications.
4
IN
MR
5
IN
PWR_ON/OFF
6 7
IN OUT
FS FAULT
8
OUT
HEALTHY
9
OUT
RST
10 11 12
IN IN GND
AIN1 AIN2 GND
13
IN
VREF_ADC
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PIN DESCRIPTIONS (Cont.)
Pin Number 14 15 41,36, 31, 26, 21,16 42, 37, 32, 27, 22, 17 43, 38, 33, 28, 23, 18 44, 39, 34, 29, 24, 19 45, 40, 35, 30, 25, 20 46 47 48 Pin Type I/O CAP IN CAP OUT Pin Name VREF_CNTL FILT_CAP VMX CAPX PUPX Pin Description Voltage reference input used for DC output control and margining. VREF_CNTL can be programmed to output the internal 1.25V reference. External capacitor input used to filter VMX inputs Positive converter sense line, VMA through VMF External capacitor input used to filter the VMX inputs to the 10-bit ADC, CAPA through CAPF. This provides an RC filter where R = 25k. Programmable active high/low open drain converter enable output, PUPA through PUPF Output voltage used to control the output of DC/DC converters, TRIMA through TRIMF . If the ADOC/margining functionality is not used on a channel the associated TRIMX pin should be left floating External sample and hold capacitor input used to set the voltage on the TRIM pins, TRIM_CAPA through TRIM_CAPF Power supply of the part 12V power supply input internally regulated to either 3.6V or 5.5V External capacitor input used to filter the internal supply
OUT
TRIMX TRIM_CAPX VDD 12VIN VDD_CAP
CAP PWR PWR CAP
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PACKAGE AND PIN CONFIGURATION
48-LEAD TQFP
TRIM _CAPA TRIM _CAPB
VDD_CAP
TRIM A
TRIM B
12VIN
PUPA
PUPB 38
CAPA
48
47
46
45
44
43
42
41
40
39
SDA SCL A2 MR PW R_ON/OFF FS FAULT HEALTHY RST AIN1 AIN2 GND
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
37 36 35 34 33 32 31 30 29 28 27 26 25
CAPB
VM A
VDD
VMB TRIM_CAPC TRIMC PUPC CAPC VMC TRIM_CAPD TRIMD PUPD CAPD VMD TRIM_CAPE
VREF_CNTL
TRIM F
VM F
TRIM _CAPF
CAPF
VREF_ADC
FILT_CAP
PUPF
TRIM E
VM E
CAPE
PUPE
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ABSOLUTE MAXIMUM RATINGS Temperature Under Bias....................... -55C to 125C Storage Temperature............................ -65C to 150C Terminal Voltage with Respect to GND: VDD Supply Voltage ......................... -0.3V to 6.0V 12VIN Supply Voltage ..................... -0.3V to 15.0V PUPA, through PUPF ....................... -0.3V to 15.0V All Others ................................-0.3V to VDD + 0.7V Output Short Circuit Current ............................... 100mA Lead Solder Temperature (10 secs) .................... 300C Junction Temperature........................................150C ESD Rating per JEDECB................................2000V Latch-Up testing per JEDEC........................100mA
Note A - The device is not guaranteed to function outside its operating rating. Stresses listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions outside those listed in the operational sections of the specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability. Devices are ESD sensitive. Handling precautions are recommended.
RECOMMENDED OPERATING CONDITIONS Temperature Range (Industrial)...........-40C to +85C (Commercial) ............-5C to +70C VDD Supply Voltage ..................................2.7V to 5.5V 12VIN Supply VoltageC ............................8.0V to 14.0V VIN ............................................................ GND to VDD VOUT ...................................................... GND to 14.0V Package Thermal Resistance (JA) 48-Lead TQFP........................................80oC/W
Moisture Classification Level 1 (MSL 1) per J-STD- 020. MSL 3 for 100% Sn, RoHS compliant, see Ordering Information.
Note B - Pin # 46 and pin #48 meet 1kV. Note C - Range depends on internal regulator set to 3.6V or 5.5V, see 12VIN specification below.
RELIABILITY CHARACTERISTICS Data Retention.....................................100 Years Endurance...................................100,000 Cycles
DC OPERATING CHARACTERISTICS
(Over recommended operating conditions, unless otherwise noted. All voltages are relative to GND.) Symbol Parameter Notes Min Typ Max VDD Supply Voltage 2.7 5.5 12VIN IDD I12VIN Supply Voltage Power Supply Current from VDD Power Supply Current from 12VIN
Internally regulated to 5.5V Internally regulated to 3.6V
Unit V V V mA mA
10 6 1.4 3.6
14 14 5 5
All TRIM pins floating, 12VIN floating All TRIM pins floating, VDD floating, Note 10 TRIM Sourcing Maximum Current TRIM Sinking Maximum Current Depends on Trim range of DC-DC Converter Max acceptable board and cap leakage is 50nA
Internally regulated to 3.6V
TRIM characteristics ITRIM TRIM output current through 100 to 1.0V, Note 10 Margin Control and ADOC Range 1.5 1.5
VREF_CNT L/4
mA mA VDD V
VTRIM
TRIM_CAP characteristics TRIM output current through 1uF capacitor to ground, Note 2 All other input and output characteristics ITRIM_CAP VVDD_CAP VDD_CAP voltage 100 3.4 5.3
VDD - 0.1
nA 3.8 5.7
VDD + 0.1
3.6 5.5
VDD
V V V
Internally regulated to 5.5V
No voltage on 12VIN, Note 10
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DC OPERATING CHARACTERISTICS (CONTINUED)
(Over recommended operating conditions, unless otherwise noted. All voltages are relative to GND.) Symbol Parameter Notes Min Typ Max VIH Input High Voltage (FS, PWR_ON/OFF, MR#, SDA, SCL), Note 3 Input Low Voltage (FS, PWR_ON/OFF, MR#, SDA, SCL), Note 3 Input High Voltage (FS, PWR_ON, MR#, SDA, SCL), Notes 3, 10 Input Low Voltage (FS, PWR_ON, MR#, SDA, SCL), Notes 3, 10 Output Low Current, Note 6 Output low current for SDA Leakage current on SDA and SCL Positive Sense Voltage Monitor Threshold Step Size Internal Temperature Sensor Accuracy (Notes 5, 8) Temperature Threshold Step Size Internal 1.25VREF Output Voltage Accuracy External VREF Voltage Range External VREF=1.25V, 0.1%, Total PUPx ISINK = 6ma, VSENSE 3.5V, T = 0C to +50C External VREF=1.25V, 0.1%, Total PUPx ISINK = 6ma, VSENSE 3.5V, T = 0C to +70C External VREF=1.25V, 0.1%, Total PUPx ISINK = 6ma, VSENSE 3.5V, T = 0C to +50C Internal VREF=1.25V, Total PUPx ISINK = 6ma, T = 0C to +50C VOL=0.4V When SDA or SCL are at 3.6V VM pin VM, AIN1/AIN2 pins Commercial Temp Range Industrial Temp Range Internal Temp Sensor T = +25C T = -40C to +85C -0.4 -0.8 0.5 -0.20 +0.3 5 -4 -6 4 6 0.25 +0.4 +0.8
VDD_CAP
Unit V V
VDD = 2.7V VDD = 5.0V VDD = 2.7V VDD = 5.0V
Internally regulated to 3.6V Internally regulated to 5.5V Internally regulated to 3.6V Internally regulated to 5.5V
0.7 x VDD_CAP 0.7 x VDD_CAP 0.3 x VDD_CAP 0.3 x VDD_CAP 0.7 x VDD_CAP 0.7 x VDD_CAP 0.3 x VDD_CAP 0.3 x VDD_CAP
V V V V V V mA mA
VIL
VIH
VIL IOL IOLSDA IS VSENSE VMonitor TSA TMonitor VREF Ext VREF
0 3
1.0
1.0
VDD_CAP
A V mV
o o o
+4 +6
C C C
% % V %
0.1
+0.20
-0.35
0.1
+0.35
%
ADOCACC
ADOC/Margin Accuracy
-0.50
0.3
+0.50
%
-0.50
0.3
+0.50
%
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DC OPERATING CHARACTERISTICS (CONTINUED)
Symbol VOUT_VALID UVLO IVDD_CAP Parameter Minimum Output Valid Voltage UVLO (Under Voltage Lockout) threshold (Note 4) Notes VDD_CAP voltage at which the PUP, RST, HEALTHY and FAULT outputs are valid VDD_CAP rising VDD_CAP falling Min Typ 1 2.6 2.5 10 10
Minimum resolution for which no missing codes are guaranteed
Max
Unit V V V mA Bits Bits
Maximum load on VDD_CAP, Note 10 AIN1/AIN2 ADC characteristics N Resolution MC S/N DNL INL GAIN OFFSET ADC_TC IMADC IIVREF ICVREF IRVREF Missing codes Signal-to-noise Ratio Differential non-linearity Integral non-linearity Positive full scale gain error Offset error Full scale temperature coefficient Analog ADC Input Impedance VREF input current VREF input capacitance VREF input impedance
10 72 -1/2 -1 -0.5 -1 +1/2 +1 +0.5 +1
Conversion rate = 500Hz Note 7 Note 7 Note 7
0.16 15 10 250 200 1
dB LSB LSB % LSB ppm/ o C M nA pF k Bits Bits
VMA-VMF, VDD ADC characteristics N Resolution MC S/N
ERR_ADC
10
Minimum resolution for which no missing codes are guaranteed Conversion rate = 500Hz Total ADC Read Error
Missing codes Signal-to-noise Ratio
Total ADC Error
10 72 -4 100 10 +4
dB LSB K Bits Bits
IMADC Analog ADC Input Impedance 12VIN ADC characteristics N Resolution MC S/N
ERR_ADC
VMA-VMF
Missing codes Signal-to-noise Ratio
Total ADC Error
Minimum resolution for which no missing codes are guaranteed Conversion rate = 500Hz Total ADC Read Error
10 72 -4 +4
dB LSB
Note 1 - Range depends on internal regulator set to 3.6V or 5.5V see 12VIN specification. Note 2 - See Application Note 37 which describes the type of capacitors to use to obtain minimum leakage. Note 3 - All logic levels are with respect to the voltage on VDD_CAP, when supplied from VDD; VDD_CAP is equal to VDD, under no load. Note 4 - (100mV typical Hysteresis) Note 5 - Under certain operating conditions, self-heating could result in additional temperature sensor error. Note 6 - SDA not included (separate electrical specification). The device can sink more than 20mA, however total ISINK from all PUPx pins should not exceed 6mA or ADOCACC specification will be affected. Note 7 - The formula for the total ADC inaccuracy is: [((ADC read voltage) +/- INL)*(range of gain error)]+range of offset error Note 8 - When temperature sensor is not used (determined by the hex file configuration setting) sensor accuracy is tested for typical values only. Note 9 - The term "FAULT#" throughout this document describes a pin and output signal, whereas the term "fault" describes an operating condition that may or may not activate the FAULT# pin. The FAULT# pin can only be activated by Ain1, Ain2 and Temperature fault conditions. Note 10 - Guaranteed by Design and/or Characterization - not 100% tested in production. Summit Microelectronics, Inc 2125 3.1 7/22/2008
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AC OPERATING CHARACTERISTICS
Over recommended operating conditions, unless otherwise noted. All voltages are relative to GND. See Figure 5 and 6 Timing diagrams. Symbol Description Conditions Min Typ Max Unit tDPON = 0.64ms Programmable Power-on delay tDPON = 12.5ms from VMX out-of-fault to PUPY tDPON -15 tDPON +15 % tDPON = 25ms active tDPON = 50ms tDPOFF = 0.64ms Programmable Power-off delay tDPOFF = 12.5ms -15 tDPOFF tDPOFF +15 % from VMX off to PUPY inactive tDPOFF = 25ms tDPOFF = 50ms tPRTO = 0.64ms Programmable Reset Time-Out tPRTO = 25ms -15 tPRTO tPRTO +15 % Period tPRTO = 100ms tPRTO = 200ms tSTT = OFF tSTT = 100ms Programmable Sequence -15 tSTT tSTT +15 % Termination Timer tSTT = 200ms tSTT = 400ms Time for ADC conversion 10-bit ADC sampling period tADC 2 ms of all 11 channels Update period for Active Active DC Control sampling DC Control of channels 1.7 ms tDC_CONTROL period A-F Single ADC channel conversion Update period for Active 182 tconv s time DC Control per channel Slow Margin, + 10% change in voltage with 850 ms 0.1% ripple TRIM_CAP=1F TMARGIN Margin Time from Nominal Fast Margin, + 10% change in voltage with 85 ms 0.1% ripple TRIM_CAP=1F Auto-Monitor suspended Auto-Monitor Suspend Period tA-M_SUSPEND 25 100 ms indefinitely by a faulty I2C transaction
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I2C 2-WIRE SERIAL INTERFACE AC OPERATING CHARACTERISTICS - 100/400kHz
T =-40C to +85C, VDD = +2.8V to +5.5V, unless otherwise noted. All voltages are relative to GND. See Figure 4 Timing Diagram. Conditions 100kHz 400kHz Symbol Description Min Typ Max Min Typ Max fSCL tLOW tHIGH tBUF tSU:STA tHD:STA tSU:STO tAA tDH tR tF tSU:DAT tHD:DAT TI tWR_CONFIG tWR_EE SCL Clock Frequency Clock Low Period Clock High Period Bus Free Time Start Condition Setup Time Start Condition Hold Time Stop Condition Setup Time Clock Edge to Data Valid Data Output Hold Time SCL and SDA Rise Time SCL and SDA Fall Time Data In Setup Time Data In Hold Time Noise Filter SCL and SDA Write Cycle Time Config Write Cycle Time EE Noise suppression, Note 11 Configuration Registers Memory Array SCL low to valid SDA (cycle n) SCL low (cycle n+1) to SDA change
Note 11 Note 11 Before New Transmission - Note 11
Units KHz s s s s s s
0 4.7 4.0 4.7 4.7 4.0 4.7 0.2 0.2
100
0 1.3 0.6 1.3 0.6 0.6 0.6
400
3.5
0.2 0.2
0.9
s s
1000 300 250 0 100 10 5 150 0 100
1000 300
ns ns ns ns ns
10 5
ms ms
Note 11 - Guaranteed by Design.
TIMING DIAGRAMS
tWR (For Write Operation Only) tLOW tSU:DAT tDH tSU:STO tBUF
tR SCL tSU:STA SDA (IN) tAA SDA (OUT)
tF tHD:STA
tHIGH tHD:DAT
Figure 4 - Basic I2C Serial Interface Timing
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TIMING DIAGRAMS (CONTINUED)
0 PUP A t DPONA 1 2
VM A
PUP B
t DPONB
VM B t DPONC PUP C
VM C
PUP D
t DPOND
VM D
Figure 5 - The SMM665C cascade sequencing the supplies on and then monitoring for fault conditions.
2 PUP A 1 0
t DPOFFA
VM A
PUP B
t DPOFFB
VM B
PUP C t DPOFFC
VM C
PUP D
t DPO FFD
VM D
Figure 6 - The SMM665C cascade sequencing the supplies off.
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APPLICATIONS INFORMATION DEVICE OPERATION
POWER SUPPLY The SMM665C can be powered by either a 12V input through the 12VIN pin or by a 3.3V or 5.0V input through the VDD pin. The 12VIN pin feeds an internal programmable regulator that internally generates either 5.5V or 3.6V. A voltage arbitration circuit allows the device to be powered by the highest voltage from either the regulator output or the VDD input. This voltage arbitration circuit continuously checks for these voltages to determine which will power the SMM665C. The resultant internal power supply rail is connected to the VDD_CAP pin that allows both filtering and holdup of the internal power supply. To ensure that the input voltage is high enough for reliable operation, an under voltage lockout circuit holds the controlled supplies off until the UVLO thresholds are met. MODES OF OPERATION The SMM665C has four basic modes of operation (shown in Figures 5 through 8): Power-on cascade sequencing mode, ongoing operations-monitoring mode, supply margining mode and Power-off cascade sequencing mode. In addition, there are two features: ADOC and forced shutdown which can be used during monitoring and margining mode. A detailed description of each mode and feature follows. ACTIVE DC OUTPUT CONTROL (ADOCTM) The SMM665C can actively control the DC output voltage of bricks or DC/DC converters that have a trim pin during monitoring and margining mode. The converter may be an off-the shelf compact device, or may be a "roll your own" circuit on the application board. In either case, the SMM665C dramatically improves voltage accuracy (down to 0.2%) by implementing closed-loop ADOC active control. This utilizes the DC-DC's "trim" pin as shown in Figure 12, or an equivalent output voltage feedback adjustment "VADJ" or "FB" node in a user's custom circuit, Figure 13. Each of the TRIMX pins on the SMM665C is connected to the trim input pins on the power supply converters. A sense line from the channel's point-ofload connects to the corresponding VM input. The ADOC function cycles through all six channels (A-F) every 1.7ms making slight adjustments to the voltage on the associated TRIMX output pins based on the voltage inputs on the VMX pins. These voltage adjustments allow the SMM665C to control the output voltage of power supply converters to within 0.2% when using a 0.1% external voltage reference.
Figure 7 - Waveform shows four SMM665C channels exhibiting Sequence-on to Nominal voltage, Margin High or Low, Nominal voltage and then sequence-off Ch 1 = 2.5V DC-DC converter output (Yellow trace) Ch 2 = 1.8V DC-DC converter output (Blue trace) Ch 3 = 1.5V DC-DC converter output (Purple trace) Ch 4 = 1.2V DC-DC converter output (Green trace
Figure 8 - Waveform shows two SMM665C channels Sequencing-on to Nominal voltage, Margin High and Low, and then sequence-off. Channel 3 and 4 shows the RST and HEALTHY signals. Ch 1 = 2.5V DC-DC converter output (Yellow trace) Ch 2 = 1.5V DC-DC converter output (Blue trace) Ch 3 = RST signal output (Purple trace) Ch 4 = HEALTHY signal output (Green trace)
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APPLICATIONS INFORMATION (CONTINUED)
A pulse of current, either sourced or sunk for 5s every 1.7ms, to the capacitors connected to the TRIM_CAPX pins adjusts the voltage output on the TRIMX pins. The voltages on the TRIM_CAPX pins are buffered and applied to the TRIMX pins. The voltage adjustments on the TRIMX pins cause a slight ripple of less than 1mV on the power supply voltages. The amplitude of this ripple is a function of the TRIM_CAP capacitor and the trim gain of the converter. Application Note 37 details the calculation of the TRIM_CAP capacitor to achieve a desired minimum ripple. Each channel can be programmed to either enable or disable the Active DC Control function. When disabled or not active, the TRIMX pins on the SMM665C are high impedance inputs. If disabled and not used, they can be connected to ground. The voltages on the TRIMX pins are buffered and applied to the TRIM_CAPX pins charging the capacitors. This allows a smooth transition from the converter powering up to its nominal voltage; to the SMM665C controlling that voltage, and to the Active DC Control nominal setting. The pulse of current can be increased to a 10X pulse of current until the power supply voltages are at their nominal settings by selecting the programmable Speed-Up Convergence option. As the name implies, this option decreases the time required to bring a supply voltage from the converter's nominal output voltage to the Active DC Control nominal voltage setting. POWER-ON CASCADE SEQUENCING The SMM665C can be programmed to sequence up to six power supplies in any order. Each of these six channels (A-F) has an associated open drain PUP output that, when connected to a converter's enable pin, controls the turn-on of the converter. The channels are assigned sequence positions to determine the order of the sequence. Any channel can also be programmed to not take part in the sequencing in applications with fewer than six supplies. The polarity of each of the PUPX outputs is programmable for use with various types of converters. Power-on sequencing can be initiated by the PWR_ON/OFF pin or via I2C control. The polarity of the PWR_ON/OFF pin is programmable. If hard wired in its active state the SMM665C will automatically initiate the Power-on sequence. Otherwise, toggling the PWR_ON/OFF pin to its active state will initiate the Power-on sequence. To enable software control of the sequencing feature, the SMM665C offers an I2C command to initiate Power-on sequencing while the PWR_ON/OFF pin is in its inactive state. The SMM665C can be programmed to wait until either or both VDD and 12VIN inputs are within their respective voltage threshold limits before Power-on sequencing is allowed to begin. This ensures that the converters have their full supply voltage before they are enabled. Once Power-on sequencing begins, the SMM665C will wait a Power-on delay time (tDPON) for any channel in the first sequence position (0) and then activate the PUPX outputs for those channels. The Power-on delay times are individually programmable for each channel. The SMM665C will then wait until all VMX inputs of the channels assigned to the first sequence position (0) are above their programmed UV1 thresholds which is called cascade sequencing. At this point, the SMM665C will enter the second sequence position (1) and begin to timeout the Poweron delay times for the associated channels. This process continues until all of channels in the sequence have turned on and are above their UV1 threshold. The status registers indicates that all sequenced power supply channels have turned on. Once these channels are above their UV1 thresholds, the SMM665C will begin the Active DC Control of the enabled channels. The Power-on sequencing mode ends when the Active DC Controlled channels are at their nominal voltage setting. The "Ready" bit in the status registers signifies that the voltages are at their set points. The programmable sequence termination timer can be used to protect against a stalled Power-on sequence. This timer resets itself at the beginning of each sequence position. All channels in the sequence position must go above their UV1 threshold before the sequence termination timer times out (tSTT) or the sequence will terminate and all PUPX outputs will be switched to their inactive state. The status registers contain bits that indicate the sequence has been terminated and in which sequence position the timer timed out. This timer has four settings of OFF, 100ms, 200ms and 400ms.
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APPLICATIONS INFORMATION (CONTINUED)
While the SMM665C is in the Power-on sequencing mode the RST output is held active and the HEALTHY output is held inactive regardless of trigger sources (Figure 8). The Power-off and Force Shutdown trigger options are also disabled while in this mode. Furthermore, the SMM665C will not respond to activity on the PWR_ON/OFF pin or to a Power-off I2C command during Power-on sequencing mode. ONGOING OPERATIONS-MONITORING MODE During ongoing operations mode, the part can (1) monitor (2) actively control via ADOC, and (3) use force shutdown if necessary. Once the Power-on sequence is complete and before a Power-off sequence has been initiated, the SMM665C continues to monitor all VMX inputs, the VDD and 12VIN inputs, and two temperature sensor inputs with a 10-bit ADC. Each of these inputs is sampled and converted by the ADC every 2ms. The ADC input has a range of 0V to four times the voltage on VREF_ADC for inputs VMA-F and the VDD input. The range is extended to 12 times VREF_ADC for the 12VIN input and is reduced to two times VREF_ADC for the AIN1 and AIN2 inputs. The SMM665C monitors internal temperature using the 10-bit ADC and the auto-monitor function. Two under temperature and two over temperature thresholds can be set, each with its own programmable trigger options and consecutive conversion before trigger counter. Resolution is 0.25 C per bit scaled over the range of -128 C to 127.75 C. The temperature value can be acquired over the I2C bus as a 10-bit signed two's complement value. The SMM665C compares each resulting ADC conversion with two programmable 10-bit undervoltage limits (UV1, UV2) and two programmable 10bit over-voltage limits (OV1, OV2) for the corresponding input. A consecutive conversion counter is used to provide filtering of the ADC inputs. Each limit can be programmed to require 1, 2, 4 or 6 consecutive out-of-limit conversions before it is said to be in fault. One in-limit conversion will remove the fault from the threshold limit. This provides digital filtering of the monitored inputs. The ADC inputs VMAF can use additional filtering by connecting a capacitor from the corresponding CAPX pins to ground to form an analog RC filter (R=25k). The input is considered to be in a fault condition if any of its limit thresholds are in fault. Setting an OV threshold limit to full-scale (3FFHEX), or setting an UV threshold limit to 000HEX ensures that the limit can never be in fault. The status registers provide the real-time status of all monitored inputs. The voltage threshold limits for inputs VMA-F, VDD and 12VIN can be programmed to trigger the RST and HEALTHY outputs as well as a Force Shutdown and Power-off operation when exceeded. The threshold limits for the internal temperature sensor and the AIN1 and AIN2 inputs can be programmed to trigger the RST, HEALTHY, and FAULT outputs. The HEALTHY and FAULT outputs of the SMM665C are active as long as the triggering limit remains in a fault condition. The RST output also remains active as long as the triggering limit remains in a fault condition; however, once the trigger source goes away the RST will remain active for a reset timeout period (tPRTO). AUTO-MONITOR MODE The auto-monitor mode, responsible for monitoring all voltage thresholds and triggering the programmable options, is paused during an I2C transaction. This is done to allow the I2C interface to access the internal data bus that is used in the auto-monitor function Specifically, the auto-monitor is paused approximately 100ns after the falling edge of SCL during transmission of the R/W bit of a valid slave address. For normal I2C transactions, the auto-monitor function is resumed following an I2C STOP issued at the end of the transaction or upon the NACK of an invalid slave address. For I2C ADC conversion transactions, which employ acknowledge polling, the auto-monitor function is resumed after the conversion has completed (approximately 300us after the second ACK of the transaction) and following a I2C STOP issued at the end of the transaction or upon the NACK of an invalid slave address. During every suspension of the auto-monitor, a 25ms timer is activated. The clock stage will determine the exact timeout period, typically between 25msec and 50msec. Should the I2C transaction fail, this timer will expire and restart the auto-monitor. See "Auto-Monitor Function" section for timing details and conditions under which the auto-monitor timer will be asserted.
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APPLICATIONS INFORMATION (CONTINUED)
TEMPERATURE SENSOR ACCURACY The internal temperature sensor accuracy is 5oC from -40 to +90oC. The sensor measures the temperature of the SMM665C die and the ambient temperature. If VDD is at 5V, the die temperature is +2oC and at 12V, it is +4oC. In order to calculate this difference in specific applications measure the Vdd or 12VIN supply current and calculate the power dissipated and multiply by 80oC/W. For instance, 5V and 5mA is 25mW, which creates a 2oC offset. Note: For hex files (configuration settings) that indicate no use of the temperature sensor, only the typical temperature sensor accuracy is valid. MARGINING The SMM665C has two additional Active DC Output Control voltage settings for channels A-F; margin high and margin low. The margin high and margin low voltage settings can range from 0.3V to VDD of the converters' nominal output voltage depending on the specified margin range of the DC-DC converter. These settings are stored in the configuration registers and are loaded into the Active DC Control voltage setting by margin commands issued via the I2C bus. The channel must be enabled for Active DC Control in order to enable margining. The margin command registers contain two bits for each channel that decode the commands to margin high, margin low, or control to the nominal setting. Therefore, any combination of margin high, margin low, and nominal control is allowed in the margining mode. Once the SMM665C receives the command to margin the supply voltages, it begins adjusting the supply voltages to move toward the desired setting. When all channels are at their voltage setting, a bit is set in the margin status registers. Note: Configuration writes or reads of registers 00HEX to 0FHEX should not be performed while the SMM665C is margining. POWER-OFF CASCADE SEQUENCING The SMM665C can be programmed to perform Poweroff sequencing in either the same order or reverse order of Power-on cascade sequencing. Power-off cascade sequencing can be initiated by the PWR_ON/OFF pin, via I2C control or triggered by a fault condition on any of the monitored inputs. Toggling the PWR_ON/OFF pin to its inactive state will initiate the Power-off sequence. To enable software control of the Power-off sequencing feature, the SMM665C offers an I2C command to initiate Power-off sequencing regardless of the state of the PWR_ON/OFF pin. Furthermore, Power-off sequencing can be initiated by a fault condition on a monitored input. Once Power-off sequencing begins, the SMM665C will wait a Power-off delay time (tDPOFF) for any channel in the last sequence position (reverse order) and then deactivate the PUP outputs for those channels. The Power-off delay times are individually programmable for each channel. The SMM665C will then wait until all VMX inputs of the channels assigned to that sequence position are below the programmed OFF thresholds. At this point, the SMM665C will decrement to the next sequence position and begin to timeout the Power-off delay times for the associated channels. This process continues until all of channels in the sequence have turned off and are below their OFF thresholds. The status register reveals that all sequenced channels have turned off. The Power-off sequencing mode ends when all sequenced supplies are below their OFF thresholds. The programmable sequence termination timer can be used to protect against a stalled Power-off sequence. This timer resets itself at the beginning of each sequence position. All channels in the sequence position must go below their OFF threshold before the sequence termination timer times out (tSTT) or the sequence will terminate and all PUP outputs will be switched to their inactive state. This timer has four settings of OFF, 100ms, 200ms and 400ms. The sequence termination timer can be disabled separately for Power-off sequencing. While the SMM665C is in the Power-off sequencing mode the RST output is held active and the HEALTHY output is held inactive regardless of trigger sources (Figure 8). The Force Shutdown trigger option is also disabled while in this mode. Furthermore, the SMM665C will not respond to activity on the PWR_ON/OFF pin or to a Power-on I2C command during Power-off sequencing mode.
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APPLICATIONS INFORMATION (CONTINUED)
FORCE SHUTDOWN The Force Shutdown operation brings all PUPX outputs to their inactive state. This operation is used for an emergency shutdown when there is not enough time to sequence the supplies off. The Force Shutdown operation shuts off all sequenced channels and waits for the supply voltages to drop below their respective OFF thresholds. A Force Shutdown operation can be initiated by any one of four events. The first two methods for initiating a Force Shutdown are always enabled. Simply taking the FS pin to its active state will initiate a Force Shutdown operation and maintain it until the pin is brought to its inactive state. An I2C Force Shutdown command allows the Force Shutdown operation to be initiated via software control. This I2C Force Shutdown command sets a volatile register bit that triggers a Force Shutdown. This bit is cleared after all sequenced channels have dropped below their OFF voltage threshold. During Power-on and Power-off sequencing, the sequence termination timer can initiate a Force Shutdown operation. As described in the previous sections, the sequence termination timer triggers a Force Shutdown operation if it times out before the power supply voltages surpass their voltage thresholds. This Force Shutdown will remain active until all sequenced power supply channels have dropped below their OFF voltage threshold. While the SMM665C is in ongoing operations-monitor mode, a programmed fault condition on any power supply channel or on the 12VIN or VDD inputs can trigger a Force Shutdown. A Force Shutdown resulting from this will remain active until all sequenced power supply channels have dropped below their OFF voltage threshold. For restarting the device, the FS command needs to be cleared by writing that bit to a zero. This will clear the command and, if the POWER-ON/OFF pin is not being forced low externally the SMM665C will begin a power-on sequence
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APPLICATIONS INFORMATION (CONTINUED)
SMM665C BROWNOUT RECOVERY/HANDLING During a power `brown-out' (Figure 9) the SMM665C can default to a power-off state, thus requiring toggling of the PWR_ON/OFF pin to enable the device to perform a power-on sequence. For applications using I2C control of the power-on/power-off function, the same result may be effected by, upon recovery of power, issuing a software (I2C) `Power-Off' command followed by a `Power-On' command and ending with
-48V Supply 0V
a `Clear' command. If the PWR_ON/OFF pin is in the asserted state, the SMM665C will initiate a power-on sequence once all input conditions are met. Otherwise the PWR_ON/OFF pin may require toggling if, upon recovery from the `brownout', it is in the de-asserted state.
-48V
Pow er Brow n-Out
SMM665 Supplies SMM665 Hold-Up Time +12VIN
VDD_CAP
Figure 9 - Power Brown-Out with Resulting Loss of SMM665C Supply Voltages
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APPLICATIONS INFORMATION (CONTINUED)
AUTO-MONITOR FUNCTION The auto-monitor function is used for monitoring all supplies throughout the power-on and power-off sequencing, force shutdown operation, and monitor mode. The auto-monitor function is paused during an I2C transaction. This function is re-enabled by several methods as described in the diagrams below.
Pausing Auto-Monitor: I2C Transaction Addressing the SMM665C
Start SDA SA3 SA2 SA1 SA0 BA2 BA1 BA0 R/W ACK
SCL
AUTO-MONITOR
Figure 9A: Auto-monitor is paused on the falling edge of SCL during the R/W bit following a valid slave address.
Re-Enabling Auto-Monitor: I2C Read Transaction
Stop SDA RD3 RD2 RD1 RD0 NACK from Host
SCL
SYSTEM CLOCK (T=5us)
AUTO-MONITOR
Figure 9B: At the end of an I2C read transaction, auto-monitor is re-enabled on the falling edge of the internal system clock after the Stop.
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APPLICATIONS INFORMATION (CONTINUED)
Re-Enabling Auto-Monitor: I2C Command Write Transaction
Stop SDA WD3 WD2 WD1 WD0 ACK
SCL
SYSTEM CLOCK (T=5us)
AUTO-MONITOR
Figure 9C: At the end of an I2C command write transaction, auto-monitor is re-enabled on the falling edge of the internal system clock after the Stop. The I2C command write is any write to slave address 9Xh, word address 8Xh.
Re-Enabling Auto-Monitor: I2C Writes to Configuration, General Purpose Memory and Margin Control Registers
Stop SDA WD3 WD2 WD1 WD0 ACK
SCL
EE_WRITE/READOUT
~15ms
SYSTEM CLOCK (T=5us)
AUTO-MONITOR
Figure 9D: At the end of an I2C write to configuration, general purpose memory or margin control registers, auto-monitor is re-enabled on the falling edge of the internal system clock after the EE_WRITE/READOUT has completed.
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APPLICATIONS INFORMATION (CONTINUED)
Re-Enabling Auto-Monitor: Auto-Monitor Timeout
SDA
BA0
R/W
ACK
SCL
AUTO-MON TIMER ENABLE
>25ms
AUTO-MON TIMER TIMEOUT
SYSTEM CLOCK (T=5us)
AUTO-MONITOR
Figure 9E: Auto-monitor is re-enabled on the falling edge of the internal system clock after the automonitor timer has timed out. The auto-monitor timer is enabled when auto-monitor is paused and is restarted on the falling edge of SCL.
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APPLICATIONS INFORMATION (CONTINUED)
Re-Enabling Auto-Monitor: Invalid Slave Address
Start SDA SA3 SA2 SA1 SA0 BA2 BA1 BA0 R/W NACK
SCL
SYSTEM CLOCK (T=5us)
AUTO-MONITOR
Figure 9F: Auto-monitor is re-enabled on the falling edge of the internal system clock after the falling edge of SCL during the NACK following a invalid slave address.
Re-Enabling Auto-Monitor: Invalid Slave Address During an I2C A-to-D Conversion
Start SDA SA + R/W ACK WA ACK
Start SA + R/W NACK
SCL
x8
x8
x8
CONVERSION_BUSY
~250us
SYSTEM CLOCK (T=5us)
AUTO-MONITOR
Figure 9G: During the 250us A-to-D conversion time, the activity on SDA and SCL are ignored.
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APPLICATIONS INFORMATION (CONTINUED)
Re-Enabling Auto-Monitor: Invalid Slave Address During an I2C A-to-D Conversion
Start SDA SA + R/W NACK
Start SA + R/W NACK
(Invalid SA)
SCL x8
(Invalid SA)
x8
CONVERSION_BUSY
SYSTEM CLOCK (T=5us)
AUTO-MONITOR
Figure 9H: Auto-monitor is re-enabled on the falling edge of the internal system clock after the falling edge of SCL during the NACK following a invalid slave address after the conversion has completed.
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APPLICATIONS INFORMATION (CONTINUED)
RESTART OF SEQUENCING POWER-ON CASCADE after the brownout condition is over or if the supplies do not fully discharge before initiating a Power-on sequence. Recommended Use of the PWR_ON/OFF pin: The PWR_ON/OFF pin is edge-triggered to lock out false or nuisance signals during both the power-on and power-off sequences. If during a system powerdown, whether deliberate or due to a failed power system, the VDD_CAP voltage falls below 2.5V, the SMM665C internal UVLO (UnderVoltage LockOut) circuit resets all internal logic. Once power has recovered above 2.6V the SMM665C will restart assuming the PWR_ON/OFF pin is in the asserted state or an I2C power command is issued. The SMM665C can be used with the PWR_ON/OFF pin either toggled by a logic level, controlled by a software command or tied either high or low as described in the data sheet.
Once a Force Shutdown or Power-off operation has completed, the SMM665C can restart the Power-on cascade sequencing. The device can be programmed to automatically restart after a Force Shutdown provided the PWR_ON/OFF pin remains in the active state or the I2C Power-on command remains in the command register. If this option is not selected, the SMM665C requires toggling of the PWR_ON/OFF pin or toggling of the I2C commands by issuing a Poweroff command and then reissuing the Power-on command in order to restart Power-on sequencing. In either case, assertion of the FS pin will prevent the SMM665C from restarting Power-on sequencing. In addition, the device can be programmed to check that VDD and the 12VIN are within their programmed voltage thresholds before restarting Power-on sequencing. In cases where brownout conditions (Figure 10) or loss of power are used to cause a sequence off of the supplies or a Force Shutdown, it is best to toggle the PWR_ON/OFF pin or use the I2C Power commands
VDD_CAP 3.6V, 5.5V
2.6V 2.5V
UVLO (Internal)
Figure 10 - Timing Sequence recovering from a VDD_CAP Power `Brown-Out'
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APPLICATIONS INFORMATION (CONTINUED)
SMM665C
Figure 11 - SMM665C Distributed power applications schematic. The accuracy of the external reference (U10) sets the accuracy of the ADOC function. Total accuracy with a 0.1% external reference is 0.2%.
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APPLICATIONS INFORMATION (CONTINUED)
12V 12V
VREG_IN
C8
TRIMB SDA I2C BUS SCL CS VMB+
Rtrim 1.6K
SS1 FB1 R7
R9
VSW1 FB1S
SMM665C
Not all components Shown For interface purposes only Part designators are from the International Rectifier iP1202 Demo board .
PUPA TRIMA C7 Rtrim 3.3K
VOUT1 1.5V SS2 FB2 R8
VIN
PUPB
R10 VMA+
IR iP1202
VSW2 FB2S VOUT2 2.5V
Figure 12 - The SMM665C can be used to sequence and control discrete DC switching regulators. The ADOC function sets the output voltage of the IR iP1202 Regulator through the FBX feedback pins. Accuracy is improved even under full load, essentially acting as a "SENSE" pin. The sequence function is applied through the iP1202 SSX soft start pins.
Figure 13 - Ch1 is set to 2.5V and Ch2 is set to 1.5V on the ip1202 board. Ch1 is set to sequence on first followed by Ch2 after 50ms. Then Ch1 is margined high while Ch2 is margined low. Ch2 is then sequenced off followed by Ch1 after 50ms.
Figure 14 - This is the same sequencing-on function but with a shorter delay between channels, the HEALTHY and RESET flags are also shown.
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DEVELOPMENT HARDWARE & SOFTWARE
The end user can obtain the Summit SMX3200 programming system for device prototype development. The SMX3200 system consists of a programming Dongle, cable and WindowsTM GUI software. It can be ordered on the website or from a local representative. The SMX3200 programming Dongle/cable interfaces directly between a PC's parallel port and the target application. The device is then configured on-screen via an intuitive graphical user interface employing drop-down menus. The Windows GUI software will generate the data and send it in I2C serial bus format so that it can be directly downloaded to the SMM665C via the programming Dongle and cable. An example of the connection interface is shown in Figure 15. When design prototyping is complete, the software can generate a HEX data file that should be transmitted to Summit for approval. Summit will then assign a unique customer ID to the HEX code and program production devices before the final electrical test operations. This will ensure proper device operation in the end application.
Top view of straight 0.1" x 0.1 closed-side connector. SMX3200 interface cable connector. Pin 10, Reserved Pin 8, Reserved Pin 6, MR# Pin 4, SDA Pin 2, SCL Pin 9, 5V Pin 7, 10V Pin 5, Reserved Pin 3, GND Pin 1, GND
D1 1N4148 VDD_CAP
SMM665C
MR SDA SCL
10 8 6 4 2
9 7 5 3 1
0.1F
GND
Figure 15 - SMX3200 Programmer I2C serial bus connections to program the SMM665C. Note that the MR pin does not need to be connected to pin 6 for programming purposes.
The latest revisions of all software and an application brief describing the SMX3200 is available from the website at: http://www.summitmicro.com/tech_support/program_kit/SMX3200.htm
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I2C PROGRAMMING INFORMATION
SERIAL INTERFACE Access to the configuration registers, general-purpose memory and command and status registers is carried out over an industry standard 2-wire serial interface (I2C). SDA is a bi-directional data line and SCL is a clock input. Data is clocked in on the rising edge of SCL and clocked out on the falling edge of SCL. All data transfers begin with the MSB. During data transfers SDA must remain stable while SCL is high. Data is transferred in 8-bit packets with an intervening clock period in which an Acknowledge is provided by the device receiving data. The SCL high period (tHIGH) is used for generating Start and Stop conditions that precede and end most transactions on the serial bus. A high-to-low transition of SDA while SCL is high is considered a Start condition while a low-to-high transition of SDA while SCL is high is considered a Stop condition. The interface protocol allows operation of multiple devices and types of devices on a single bus through unique device addressing. The address byte is comprised of a 4-bit device type identifier (slave address) and a 3-bit bus address. The remaining bit indicates either a read or a write operation. Refer to Table 1 for a description of the address bytes used by the SMM665C. The device type identifier for the memory array is generally set to 1010BIN following the industry standard for a typical nonvolatile memory. There is an option to change the identifier to 1011BIN allowing it to be used on a bus that may be occupied by other memory devices. The configuration registers are grouped with the memory array and thus use 1010BIN or 1011BIN as the device type identifier. The command and status registers as well as the 10-bit ADC are accessible with the separate device type identifier of 1001BIN. The bus address bits A[1:0] are programmed into the configuration registers. Bus address bit A[2] can be programmed as either 0 or biased by the A2 pin. The bus address accessed in the address byte of the serial data stream must match the setting in the SMM665C and on the A2 pin. Any access to the SMM665C on the I2C bus will temporarily halt the monitoring function. This does not affect the ADOC function, which will continue functioning and control the DC outputs. This is true not only during the monitor mode, but also during Power-on and Power-off sequencing when the device is monitoring the channels to determine if they have turned on or turned off. The SMM665C halts the monitor function from when it acknowledges the address byte until a valid stop is received. WRITE Writing to the memory or a configuration register is illustrated in Figures 16, 17, 19, 21 and 22. A Start condition followed by the address byte is provided by the host; the SMM665C responds with an Acknowledge; the host then responds by sending the memory address pointer or configuration register address pointer; the SMM665C responds with an acknowledge; the host then clocks in on byte of data. For memory and configuration register writes, up to 15 additional bytes of data can be clocked in by the host to write to consecutive addresses within the same page. After the last byte is clocked in and the host receives an Acknowledge, a Stop condition must be issued to initiate the nonvolatile write operation. READ The address pointer for the configuration registers, memory, command and status registers and ADC registers must be set before data can be read from the SMM665C. This is accomplished by a issuing a dummy write command, which is simply a write command that is not followed by a Stop condition. The dummy write command sets the address from which data is read. After the dummy write command is issued, a Start command followed by the address byte is sent from the host. The host then waits for an Acknowledge and then begins clocking data out of the slave device. The first byte read is data from the address pointer set during the dummy write command. Additional bytes can be clocked out of consecutive addresses with the host providing an Acknowledge after each byte. After the data is read from the desired registers, the read operation is terminated by the host holding SDA high during the Acknowledge clock cycle and then issuing a Stop condition. Refer to Figures 18, 20 and 23 for an illustration of the read sequence.
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I2C PROGRAMMING INFORMATION (CONTINUED)
WRITE PROTECTION The SMM665C powers up into a write protected mode. Writing a code to the volatile write protection register can disable the write protection. The write protection register is located at address 87HEX of slave address 1001BIN. Writing 0101BIN to bits [7:4] of the write protection register allow writes to the general-purpose memory while writing 0101BIN to bits [3:0] allow writes to the configuration registers. The write protection can reenable by writing other codes (not 0101BIN) to the write protection register. Writing to the write protection register is shown in Figure 16. CONFIGURATION REGISTERS The majority of the configuration registers are grouped with the general-purpose memory located at either slave address 1010BIN or 1011BIN. The bus address bits, A[1:0], used to differentiate the general-purpose memory from the configuration registers are set to 11BIN. Bus address bit A[2] can be programmed as either 0 or biased by the A2 pin. Two additional configuration registers are located at addresses 83HEX and 84HEX of slave address 1001BIN. Writing and reading the configuration registers is shown in Figures 17, 18, 19, 20 and 21 Note: Configuration writes or reads of registers 00HEX to 0FHEX should not be performed while the SMM665C is margining. GENERAL-PURPOSE MEMORY The 4k-bit general-purpose memory is located at either slave address 1010BIN or 1011BIN. The bus address bits, A[1:0], used to differentiate the generalpurpose memory from the configuration registers are set to 00BIN for the first 2k-bits and 01BIN for the second 2k-bits. Bus address bit A[2] can be programmed as either 0 or biased by the A2 pin. The word address must be set each time the memory is accessed. Slave Address
1001BIN
Memory writes and reads are shown in Figures 22, 23 and 24. COMMAND AND STATUS REGISTERS The command and status registers are located at slave address 1001BIN. Writes and reads of the command and status registers are shown in Figures 25 and 26. ADC CONVERSIONS An ADC conversion on any monitored channel can be performed and read over the I2C bus using the ADC read command and requires 182s to complete. The ADC read command, shown in Figure 27, starts with a dummy write to the 1001BIN slave address. Bits [6:3] of the word address byte are used to address the desired monitored input. Once the device acknowledges the channel address, it begins the ADC conversion of the addressed input. This conversion requires 70s to complete. During this conversion time, acknowledge polling can be used. The SMM665C will not acknowledge the address bytes until the conversion is complete. When the conversion has completed, the SMM665C will acknowledge the address byte and return the 10-bit conversion along with a 4-bit channel address echo. GRAPHICAL USER INTERFACE (GUI) Device configuration utilizing the Windows based SMM665C graphical user interface (GUI) is highly recommended. The software is available from the Summit website at: (http://www.summitmicro.com/tech_support/tech.htm# GUI. Using the GUI in conjunction with this datasheet and Application Note 33, simplifies the process of device prototyping and the interaction of the various functional blocks. A programming Dongle (SMX3200) is available from Summit to communicate with the SMM665C. The Dongle connects directly to the parallel port of a PC and programs the device through a cable using the I2C bus protocol. Register Type
Write Protection Register, Command and Status Registers, Two Configuration Registers, ADC Conversion Readout 1st 2-k Bits of General-Purpose Memory 2nd 2-k Bits of General-Purpose Memory Configuration Registers
Bus Address
A2 A1 A0 A2 0 0 A2 0 1 A2 1 1
1010BIN or 1011BIN
Table 1 - Address bytes used by the SMM665C.
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SMM665C
I2C PROGRAMMING INFORMATION (CONTINUED)
M aster
S T A R T 1 0 0 1
Bus Address A 2 A 1 A 0
Configuration Register Address = 87 HEX
Data = 55 HEX
S T O P 1 0 1 A C K
W A C K
1
0
0
0
0
1
1
1 A C K
0
1
0
1
0
Slave
8 H EX W rite Protection Register Address
7 HEX
5 HEX Unlocks General Purpose EE
5 HEX Unlocks Configuration Registers
Figure 16 - Write Protection Register Write
S T A R T 1 Slave 0 1 S A 0 S T O P D 2 D 1 D 0 A C K
Master
Bus Address A 2 C 7 A C K C 6
Configuration Register Address W C 5 C 4 C 3 C 2 C 1 C 0 A C K D 7 D 6 D 5
Data D 4 D 3
1
1
Figure17 - Configuration Register Byte Write
S T A R T 1 Slave 0 1 S A 0
Master
Bus Address A 2 C 7 A C K C 6
Configuration Register Address C 5 C 4 C 3 C 2 C 1 C 0 A C K D 7 D 6 D 5
Data (1) D 4 D 3 D 2 D 1 D 0 A C K
1
1
W
Master D 7 Slave D 6 D 5
Data (2) D 4 D 3 D 2 D 1 D 0 A C K D 7 D 6 D 5 D 2 D 1 D 0 A C K D 7 D 6 D 5
Data (16) D 4 D 3 D 2 D 1 D 0 A C K
S T O P
Figure 18 - Configuration Register Page Write
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SMM665C
I2C PROGRAMMING INFORMATION (CONTINUED)
S T A R T 1 Slave 0 1 S A 0 S T A R T C 1 C 0 A C K 1 0 1 S A 0
Master
Bus Address A 2 C 7 A C K C 6
Configuration Register Address W C 5 C 4 C 3 C 2
Bus Address A 2
1
1
1
1
R A C K
Master D 7 Slave D 6 D 5
Data (1) D 4 D 3 D 2 D 1 D 0 A C K D 7 D 6 D 5 D 2 D 1 D 0 A C K D 7 D 6 D 5
Data (n) D 4 D 3 D 2 D 1 D 0
N A C K
S T O P
Figure 19 - Configuration Register Read
S T A R T 1 Slave 0 0 1
Master
Bus Address A 2 A 1 A 0 C 7 A C K C 6
Configuration Register Address W C 5 C 4 C 3 C 2 C 1 C 0 A C K D 7 D 6 D 5
Data D 4 D 3 D 2 D 1 D 0 A C K
S T O P
Figure 20 - Configuration Register with Slave Address 1001BIN Write
S T A R T 1 Slave 0 0 1 S T A R T C 1 C 0 A C K 1 0 0 1
Master
Bus Address A 2 A 1 A 0 C 7 A C K C 6
Configuration Register Address W C 5 C 4 C 3 C 2
Bus Address A 2 A 1 A 0
R A C K
Master D 7 Slave D 6 D 5
Data (1) D 4 D 3 D 2 D 1 D 0 A C K D 7 D 6 D 5 D 2 D 1 D 0 A C K D 7 D 6 D 5
Data (n) D 4 D 3 D 2 D 1 D 0
N A C K
S T O P
Figure 21 - Configuration Register with Slave Address 1001BIN Read
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SMM665C
I2C PROGRAMMING INFORMATION (CONTINUED)
S T A R T 1 Slave 0 1 S A 0 S T O P D 2 D 1 D 0 A C K
Master
Bus Address A 2 0 / 1 C 7 A C K C 6
Memory Address
Data C 1 C 0 A C K D 7 D 6 D 5 D 4 D 3
0
W
C 5
C 4
C 3
C 2
Figure 22 - General Purpose Memory Byte Write
S T A R T 1 Slave 0 1 S A 0
Master
Bus Address A 2 0 / 1 C 7 A C K C 6
Memory Address C 5 C 4 C 3 C 2 C 1 C 0 A C K D 7 D 6 D 5
Data (1) D 4 D 3 D 2 D 1 D 0 A C K
0
W
Master D 7 Slave D 6 D 5
Data (2) D 4 D 3 D 2 D 1 D 0 A C K D 7 D 6 D 5 D 2 D 1 D 0 A C K D 7 D 6 D 5
Data (16) D 4 D 3 D 2 D 1 D 0 A C K
S T O P
Figure 23 - General Purpose Memory Page Write
S T A R T 1 Slave 0 1 S A 0 S T A R T C 1 C 0 A C K 1 0 1 S A 0
Master
Bus Address A 2 0 / 1 C 7 A C K C 6
Memory Address C 5 C 4 C 3 C 2
Bus Address A 2 0 / 1
0
W
0
R A C K
Master D 7 Slave D 6 D 5
Data (1) D 4 D 3 D 2 D 1 D 0 A C K D 7 D 6 D 5 D 2 D 1 D 0 A C K D 7 D 6 D 5
Data (n) D 4 D 3 D 2 D 1 D 0
N A C K
S T O P
Figure 24 - General Purpose Memory Read
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SMM665C
I2C PROGRAMMING INFORMATION (CONTINUED)
S T A R T 1 Slave 0 0 1 S T O P D 2 D 1 D 0 A C K
Master
Bus Address A 2 A 1 A 0 C 7 A C K C 6
Command and Status Register Address W C 5 C 4 C 3 C 2 C 1 C 0 A C K D 7 D 6 D 5
Data D 4 D 3
Figure 25 - Command and Status Register Write
S T A R T 1 Slave 0 0 1 S T A R T C 1 C 0 A C K 1 0 0 1
Master
Bus Address A 2 A 1 A 0 C 7 A C K C 6
Command and Status Register Address W C 5 C 4 C 3 C 2
Bus Address A 2 A 1 A 0
R A C K
Master D 7 Slave D 6 D 5
Data (1) D 4 D 3 D 2 D 1 D 0 A C K D 7 D 6 D 5 D 2 D 1 D 0 A C K D 7 D 6 D 5
Data (n) D 4 D 3 D 2 D 1 D 0
N A C K
S T O P
Figure 26 - Command and Status Register Read
S T A R T
Master
Bus Address
Channel Address CC C 0 HH H 32 1 A C K ADC conversion starts here Insert a delay of 182s or start ACK polling here C H0 0
S T A R T 1AAAR 210 (N) A C K
Channel Addr Echo CC CC 0 HH HH0 D D 98 32 10
A C K
10-Bit ADC Data
N A C K
S T O P
100
1AAAW 210
0
0
100
D DDDDDDD 7 6543210
Slave
A C K
Figure 27 - ADC Conversion Read
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SMM665C
DEFAULT CONFIGURATION REGISTER SETTINGS - SMM665CFC-802
Register Contents Register Contents Register Contents Register Contents R0 0D R40 0D R98 41 RBF E0 R1 83 R41 B9 R99 3E RC0 0B R2 0D R42 0E R9A 81 RC1 38 R3 FF R43 39 R9B 33 RC2 0B R4 0E R44 0E R9C 29 RC3 38 R5 61 R45 A4 R9D 9A RC4 09 R6 0E R46 0F R9E 11 RC5 90 R7 C7 R47 16 R9F AE RC6 09 R8 0F R48 0F RA0 41 RC7 90 R9 54 R49 B4 RA1 0B RC8 0C RA 0B R4A 06 RA2 80 RC9 00 RB 22 R4B 7F RA3 F6 RCA 0C RC 7F R4C 00 RA4 29 RCB 00 RD 3F R4D 12 RA5 5D RCC 0F RE 03 R4E 50 RA6 11 RCD FF RF 01 R80 42 RA7 71 RCE 0F R10 8F R81 48 RA8 40 RCF FF R11 9F R82 82 RA9 CE RD0 0C R12 AF R83 3E RAA 80 RD1 00 R13 BF R84 2A RAB 8F RD2 0C R14 CF R85 B8 RAC 29 RD3 00 R15 DF R86 12 RAD 1F RD4 0F R18 00 R87 F6 RAE 11 RD5 D8 R19 00 R88 26 RAF 33 RD6 0F R30 0D R89 C8 RB0 2A RD7 D8 R31 60 R8A 81 RB1 67 RE0 00 R32 0D R8B B9 RB2 0A RE1 3D R33 DC R8C 2A RB3 52 RE2 00 R34 0E R8D 34 RB4 03 RE3 3D R35 45 R8E 12 RB5 FF RE4 00 R36 0E R8F 49 RB6 03 RE5 3D R37 A2 R90 49 RB7 FF RE6 00 R38 0F R91 5C RB8 0D RE7 3D R39 08 R92 81 RB9 9A RE8 00 R3A 0F R93 52 RBA 0D RE9 3D R3B D6 R94 29 RBB 56 REA 00 R3C 00 R95 D7 RBC 0F REB 3D R3D 12 R96 11 RBD E0 R3E 50 R97 EB RBE 0F The default device ordering number is SMM665CFC-802. It is programmed with the register contents as shown above and tested over the commercial temperature range with a default VREF setting of 1.25V. Other standard external VREF voltage settings that can be specified and tested are values of: 1.024, 1.225, 1.250, 2.048, 2.500, 3.000 or 3.300. The value is derived from the customer supplied hex file. New device suffix numbers are assigned for all nondefault VREF requirements. If other VREF values are required, please contact a Summit Microelectronics Sales Representative.
RC1
Application Note 33 contains a complete description of the Windows GUI and the default settings of each of the 154 individual Configuration Registers.
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SMM665C
Advanced Information
PACKAGE
48 PIN TQFP PACKAGE
0.354 (9.00) 0.276 (7.00) BSC (A) BSC (B) Inches (Millim eters)
0.02 (0.5)
BSC
0.007 - 0.011 (0.17 - 0.27)
DETAIL "A"
(B) (A)
Ref Jedec M S-026
0.037 - 0.041 0.95 - 1.05 Pin 1 Indicator 0.039 (1.00)
Ref
0.047 MAX. (1.2)
0 o Min to 7 o Max
A
B
0.002 - 0.006 (0.05-0.15)
0.018 - 0.030 (0.45 - 0.75)
DETAIL "B"
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SMM665C
PART MARKING
SUMMIT SMM665CF xx
Summit Part Number
Status Tracking Code (Blank, MS, ES, 01, 02,...) (Summit Use)
Annn L AYYWW
Date Code (YYWW)
Pin 1
Lot tracking code (Summit use) 100% Sn, RoHS compliant Part Number suffix (Contains Customer specific programming and ordering requirements. The default device ordering number is not marked on the device)
Drawing not to scale
Product Tracking Code (Summit use)
ORDERING INFORMATION
Summit Part Number
SMM665C F Package
F = 48-Lead TQFP
C
nnn
L
Environmental Attribute Part Number Suffix
Specific requirements are contained in the suffix such as Hex code, Hex code revision, etc. The calibrated VREF voltage settings are standard values of: 1.024, 1.225, 1.250, 2.048, 2.500, 3.000 or 3.300
Temp Range
C=Commercial Blank=Industrial
NOTICE
NOTE 1 - This is a Final data sheet that describes a Summit product currently in production. Revision 3.1 - This document supersedes all previous versions. SUMMIT Microelectronics, Inc. reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. SUMMIT Microelectronics, Inc. assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained herein reflect representative operating parameters, and may vary depending upon a user's specific application. While the information in this publication has been carefully checked, SUMMIT Microelectronics, Inc. shall not be liable for any damages arising as a result of any error or omission. SUMMIT Microelectronics, Inc. does not recommend the use of any of its products in life support or aviation applications where the failure or malfunction of the product can reasonably be expected to cause any failure of either system or to significantly affect their safety or effectiveness. Products are not authorized for use in such applications unless SUMMIT Microelectronics, Inc. receives written assurances, to its satisfaction, that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; and (c) potential liability of SUMMIT Microelectronics, Inc. is adequately protected under the circumstances. (c) Copyright 2007 SUMMIT MICROELECTRONICS, Inc. ADOC
TM
PROGRAMMABLE POWER FOR A GREEN PLANETTM
is a registered trademark of Summit Microelectronics Inc., I2C is a trademark of Philips Corporation.
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