View TCM1617_70413.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

EVALUATION KIT AVAILABLE
TCM1617
SMBus Thermal Sensor with External Diode Input
FEATURES
s s s s s s s s s s Includes Internal External Sensing Capability Outputs Temperature as 8-Bit Digital Word Solid State Temperature Sensing; 1C Resolution 3.0 - 5.5V Operating Range Independent Internal and External Threshold Set-Points With ALERT# Interrupt Output SMBus 2-Wire Serial Interface Up To Nine TCM1617s May Share the Same Bus Standby Mode for Low Standby Power Low Power ............................ 70A (max) Operating ...................................... 10A (max) Standby Mode 16-Pin Plastic QSOP Package
GENERAL DESCRIPTION
The TCM1617 is a serially programmable temperature sensor optimized for monitoring modern high performance CPUs with on-board integrated thermal diodes. Temperature data is converted from the CPU's thermal diode outputs and made available as an 8-Bit digital word. Communication with the TCM1617 is accomplished via the standard System Management Bus (SMBus) commonly used in modern computer systems. This permits reading the current internal/external temperature, programming the threshold setpoints, and configuring the device. Additionally, an interrupt is generated on the ALERT# pin when temperature moves outside the preset threshold windows in either direction. A Standby command may be sent via the SMBus by signaling the STBY# input to activate the low-power Standby mode. Registers can be accessed while in Standby mode. Address selection inputs allow up to nine TCM1617s to share the same 2-wire SMBus for multi-zone monitoring. All registers can be read by the host, and both polled and interrupt driven systems are easily accommodated. Small size, low installed cost, and ease of use make the TCM1617 an ideal choice for implementing sophisticated system management schemes, such as ACPI.
TYPICAL APPLICATIONS
s Thermal Protection For Intel "Deschutes" Pentium IITM and Other High Performance CPUs with Integrated On-Board Diode -- No Sensor Mounting Problems! Accurate Thermal Sensing From Any Si Junction Diode Thermal Management in Electronic Systems: Computers, Network Equipment, Power Supplies
s s
BLOCK DIAGRAM
Internal Sensor (Diode)
D+ D-
ORDERING INFORMATION
Part No.
TCM1617MQR TCM1617EV
Control Logic
Package
Temp. Range
QSOP-16 -55C to +125C Evaluation Kit for TCM1617
Modulator Register Set
Int. Temp Ext. Temp Status Byte Config. Byte Conv. Rate Ext. Hi Limit Ext. Lo Limit Int. Hi Limit Int. Lo Limit
PIN CONFIGURATION
ALERT# STBY#
NC VDD D+ D-
1 2 3 4 5 6 7 8 TCM1617
16 NC 15 STBY# 14 13 12 11 10 9 SCL NC SDA ALERT# ADD0 NC
SCL SDA
NC ADD 1 GND
SMBus Interface
ADD 0 ADD 1
GND
16-Pin Plastic QSOP
2001 Microchip Technology Inc. DS21485A
1
TCM1617-1 2/5/99
SMBus Thermal Sensor with External Diode Input
TCM1617
ABSOLUTE MAXIMUM RATINGS*
Power Supply Voltage (VDD) .........................................6V Voltage On Any Pin ............ (GND - 0.3V) to (VDD + 0.3V) Operating Temperature (TA) .................. -55C to +125C Storage Temperature (TSTG) .................. -65C to +150C SMBus Input/Output Current ................. -1 mA to +50 mA D- Input Current ......................................................1 mA Max. Power Dissipation ........................................330 mW
*Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses above those 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 above those indicated in the operational sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS: VDD = 3.3V, -55C TA 125C, unless otherwise noted.
Symbol
VDD VUV-LOCK VPOR IDD IDD
Parameter
Power Supply Voltage VDD Undervoltage Lockout Threshold Power-On Reset Threshold Operating Current Operating Current
Test Conditions
-55 TA +125C
Min
3.0 2.4 1.0 -- -- -- -- -- -- -- VDD x 0.7 -- VDD x 0.7 --
Typ
-- 2.80 1.7 -- -- -- -- 160 -- -- -- -- -- 1 -- -- 3 -- -- 5 100 10 0.7
Max
5.5 2.95 2.3 70 180 100 10 -- 0.4 VDD x 0.3 -- VDD x 0.3 -- -- +2 +3 -- +3 +5 -- -- -- --
Unit
V V V A A A A A V V V V V C C C C C C A A V
Power Supply
IDD-STANDBY Standby Supply Current IDD-STANDBY Standby Supply Current IADD-BIAS ADD[1:0] Bias Current
VDD Falling Edge 0.25 Conv./Sec Rate SMBus Inactive (Note 1) 2 Conv./Sec Rate SMBus Inactive (Note 1) VDD = 3.3V SMBus Active VDD = 3.3V, SMBus Inactive Power-Up Only IOL = 1.0 mA (Note 3)
ALERT# Output
VOL VIL VIH Output Low Voltage Logic Input Low Logic Input High Logic Input Low Logic Input High Basic Temperature Resolution Internal Diode Temperature +60C TA +100C 0C TA +125C -55C TA < 0C +60C TA +100C 0C TA +125C -3 -55C TA < 0C (D+) - (D-) ~ 0.65V (D+) - (D-) ~ 0.65V ADD[1:0] Inputs
STBY# Input
VIL VIH TRES TIERR1
Temp-to-Bits Converter
-2 -3 -- -3 -5 -- -- --
TEERR
External Diode Temperature (Note 4) External Diode High Source Current External Diode Low Source Current D- Source Voltage
IDIODE-HIGH IDIODE-LOW VD-SOURCE
TCM1617-1
2/5/99
2
2001 Microchip Technology Inc.
DS21485A
SMBus Thermal Sensor with External Diode Input
TCM1617
ELECTRICAL CHARACTERISTICS (CONT): VDD = 3.3V, -55C TA 125C, unless otherwise noted.
Symbol tCONV CR VIH VIL VOL CIN ILEAK Parameter Conversion Time Conversion Rate Accuracy Logic Input High Logic Input Low SDA Output Low Input Capacitance SDA, SCL I/O Leakage IOL = 2 mA (Note 3) IOL = 4 mA (Note 3) Conditions from CHIP STOP to Conv. Complete (Note 2) See Conversion Rate Register Desc. Min 54 -35 2.2 -- -- -- -- -1 Typ 83 -- -- -- -- -- 5 0.1 Max 112 +35 -- 0.8 0.4 0.6 -- 1 Unit msec % V V V V pF A
2-Wire SMBus Interface
SMBus PORT AC TIMING: VDD = 3.3V, -55 (TA = TJ) 125C; CL = 80 pF, unless otherwise noted.
Symbol
fSMB tLOW tHIGH tR tF tSU(START) tH(START) tSU-DATA tH-DATA tSU(STOP) tIDLE
Parameter
SMBus Clock Frequency Low Clock Period High Clock Period SMBus Rise Time SMBus Fall Time Start Condition Setup Time (for Repeated Start Condition) Start Condition Hold Time Data in Set Up Time Data in Hold Time Stop Condition Setup Time Bus Free Time Prior to New Transition
Test Conditions
10% to 10% 90% to 90% 10% to 90% 90% to 10% 90% SCL to 10% SDA
Min
10 4.7 4 -- -- 4 4 1000 1250 4 4.7
Typ
-- -- -- -- -- -- -- -- -- -- --
Max
100 -- -- 1,000 300 -- -- -- -- -- --
Unit
KHz sec sec nsec nsec sec sec nsec nsec sec sec
NOTES: 1. Operating current is an average value (including external diode injection pulse current) integrated over multiple conversion cycles. Transient current may exceed this specification. 2. For true reccurring conversion time see Conversion Rate register description. 3. Output current should be minimized for best temperature accuracy. Power dissipation within the TCM1617 will cause self-heating and temperature drift error. 4. Refer to Application Note 64.
2001 Microchip Technology Inc.
DS21485A
3
TCM1617-1 2/5/99
SMBus Thermal Sensor with External Diode Input
TCM1617
SMBUS THERMAL S SMBUS Write Timing Diagram
A
ILOW
B
IHIGH
C
D
E
F
G
H
I
J
K
L
M
SCL
SDA
tSU(START) tH(START)
tSU-DATA
tH-DATA
tSU(STOP)
tIDLE
A = Start Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave E = Slave Pulls SDA Line Low
F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Slave H = LSB of Data Clocked into Slave I = Slave Pulls SDA Line Low
J = Acknowledge Clocked into Master K = Acknowledge Clock Pulse L = Stop Condition, Data Executed by Slave M = New Start Condition
SMBUS Read Timing Diagram
A
ILOW
B
IHIGH
C
D
E
F
G
H
I
J
K
SCL
SDA
tSU(START)
tH(START)
tSU-DATA
tSU(STOP)
tIDLE
A = Start Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave
E = Slave Pulls SDA Line Low F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Master H = LSB of Data Clocked into Master
I = Acknowledge Clock Pulse J = Stop Condition K = New Start Condition
TCM1617-1
2/5/99
4
2001 Microchip Technology Inc.
DS21485A
SMBus Thermal Sensor with External Diode Input
TCM1617
PIN DESCRIPTION
Pin Number
2 3 4 6,10 7,8 11 12 14 15 1,5, 9, 13,16
Symbol
VDD D+ D- ADD[1:0] GND ALERT# SDA SCL STBY# NC
Type
Power Bi-Directional Bi-Directional Input Power Output Bi-Directional Input Input --
Description
Power Supply Input Current Source and A/D Positive Input Current Sink and A/D Negative Input Address Select Pins (See Address Decode Table) System Ground SMBus Interrupt (SMBALERT#) SMBus Serial Data SMBus Serial Clock Standby Enable Not Connected
PIN DESCRIPTION SCL
Input. SMBus serial clock. Clocks data into and out of the TCM1617. See System Management Bus Specification, rev. 1.0, for timing diagrams. INT_TEMP equal to or exceeds INT_HLIM INT_TEMP falls below INT_LLIM EXT_TEMP equal to or exceeds EXT_HLIM EXT_TEMP falls below EXT_LLIM External Diode "Open" The operation of the ALERT# output is controlled by the MASK1 bit in the CONFIG register. If the MASK1 bit is set to "1," no interrupts will be generated on ALERT#. The ALERT# output is cleared and re-armed by the Alert Response Address (ARA). This output may be WIRE-ORed with similar outputs from other SMBus devices. If the alarm condition persists after the ARA, the ALERT# output will be immediately re-asserted. (NOTE: A pull-up resistor is necessary on ALERT# since it is an open-drain output. Current sourced from the pull-up resistor causes power dissipation and may cause internal heating of the TCM1617. To avoid affecting the accuracy of internal temperature readings, the pull-up resistors should be made as large as possible.)
SDA
Bi-directional. Serial data is transferred on the SMBus in both directions using this pin. See System Management Bus Specification, rev. 1.0, for timing diagrams.
ADD1, ADD0
Inputs. Sets the 7-bit SMBus address. These pins are "tri-state," and the SMBus addresses are specified in the Address Decode Table below. (NOTE: The tri-state scheme allows up to nine TCM1617s on a single bus. A match between the TCM1617's address and the address specified in the serial bit stream must be made to initiate communication. Many SMBuscompatible devices with other addresses may share the same 2-wire bus (see System Management Bus Specification rev. 1.0 for address allocations). These pins are only active at power-on reset, and will latch into the appropriate states.
ALERT#
Output, Open Collector, Active Low. The ALERT# output corresponds to the general SMBALERT# signal and indicates an interrupt event. The TCM1617 will respond to the standard SMBus Alert Response Address (see SMBus Specification 1.0) and associated protocol when ALERT# is asserted. Normally, the ALERT# output will be asserted when any of the following occurs:
2001 Microchip Technology Inc. DS21485A
STBY#
Input. The activation of Standby mode may be achieved using either the STBY# pin or the CHIP STOP bit (CONFIG register). If STBY# is pulled low, the TCM1617 unconditionally enters its low-power Standby mode (IDD = 10 A, max). The temperature-to-digital conversion process is halted, but ALERT remains functional. The TCM1617's bus interface
5
TCM1617-1 2/5/99
SMBus Thermal Sensor with External Diode Input
TCM1617
remains active, and all registers may be read from and written to normally. The INT_TEMP and EXT_TEMP registers will contain whatever data was valid at the time of Standby. (Transitions on SDA or SCL due to external bus activity may increase the Standby power consumption.)
STANDBY MODE
The TC1617 allows the host to put it into a low power mode (IDD = 10 A, max) Standby mode. In this mode, the A/D converter is halted, and the temperature data registers are frozen. The SMBus port operates normally. Standby mode can be enabled with either the STBY# input pin or the CHIP STOP bit in the CONFIG register. The following table summarizes this operation.
EXT_TEMP INT_TEMP
D+
Bi-directional. this pin connects to the anode of the external diode and is the positive A/D input. Current is injected into the external diode from the TCM1617, and the temperature proportional VBE is measured and converted to digital temperature data.
Temperature
D-
Bi-directional. This pin connects to the cathode of the external diode. Current is sunk from the external diode into the TCM1617 through this pin. It also is the negative input terminal to the TCM1617's A/D converter. This node is kept at approximately 0.7V above GROUND.
ASSERT ALERT#
EXT_HLIM
ASSERT ALERT# ASSERT ALERT# ASSERT ALERT#
Setpoints
INT_HLIM EXT_LLIM INT_LLIM
VDD
ALERT#
Time
Input. Power supply input. See electrical specifications.
GND
Input. Ground return for all TCM1617 functions.
Note: This diagram inplies that the appropriate setpoint is moved, temporarily, after each ALERT# event to suppress re-assertion of ALERT# immediately after the ARA/de-assertion.
Figure 1. Temperature-vs-Setpoint Event Generation
FUNCTIONAL DESCRIPTION
The TCM1617 acquires and converts temperature information from two separate sources, both silicon junction diodes, with a basic accuracy of 1C. One is located on the TCM1617 die; the other is connected externally. The external diode may be located on another IC die. The analog-todigital converter on the TCM1617 alternately converts temperature data from the two sensors and stores them separately in internal registers. The system interface is a slave SMBus port with an ALERT# (SMBALERT#) interrupt output. The interrupt is triggered when one or more of four preset temperature thresholds are tripped (see Figure 1). These four thresholds are user-programmable via the SMBus port. Additionally, the temperature data can be read at any time through the SMBus port. Nine SMBus addresses are programmable for the TCM1617, which allows for a multi-sensor configuration. Also, there is low-power Standby mode where temperature acquisition is suspended.
SMBUS SLAVE ADDRESS
The two pins ADD1 and ADD0 are tri-state input pins which determine the 7-Bit SMBus slave address of the TCM1617. The address is latched during POR.
SERIAL PORT OPERATION
Standby Mode Operation
STBY# 0 1 1 1 Chip Stop Bit Don't Care 0 1 1 One Shot? Don't Care Don't Care No Yes Operating Mode Standby Normal Standby Normal (1 Conversion Only, then Standby)
TCM1617-1
2/5/99
6
2001 Microchip Technology Inc.
DS21485A
SMBus Thermal Sensor with External Diode Input
TCM1617
POR, initialize all registers
Monitor SMBus for START condition STBY mode active?
NO YES
Stop conv., reset STATUS D[7] STATUS read? One shot?
NO NO YES YES NO YES
Start internal conversion, STATUS [D7]
Execute STATUS read and clear STATUS
STBY active?
NO
YES
STBY released? Perform one conversion cycle
Execute SMBus read
READ
Read/ Write?
WRITE
Execute SMBus write
NO
EOC?
YES
Update INT_TEMP
NO NO
YES
Valid command?
Start external conversion
NO
Address match? Thermal Trip?
YES
NO
ARA?
YES YES
STBY active?
NO
YES NO
ALERT# active?
YES
Ext. diode open?
NO
YES
ARA bus arbitration
NO YES NO
Win arbitration?
YES
Rest period over?
NO
EOC?
YES
Disable and re-arm ALERT#, send local address to host
YES
One Shot?
NO
Update EXT_TEMP
NO
CONFIG [D7] active?
YES
Rest Period according to CONV_RATE register
Thermal Trip?
NO
YES
Reset STATUS bit D[7]
Set appropriate STATUS bit D[6:2]
Enable ALERT#
Figure 2. TCM1617 Functional Description Flowchart
2001 Microchip Technology Inc. DS21485A
7
TCM1617-1 2/5/99
SMBus Thermal Sensor with External Diode Input
TCM1617
The Serial Clock input (SCL) and bi-directional data port (SDA) form a 2-wire bi-directional serial port for programming and interrogating the TCM1617. The following conventions are used in this bus architecture: All transfers take place under control of a host, usually a CPU or microcontroller, acting as the Master, which Address Decode Table
ADD0 0 0 0 open (3-state) open (3-state) open (3-state) 1 1 1 ADD1 0 open (3-state) 1 0 (open (3-state) 1 0 open (3-state) 1 SMBus Address 0011 000 0011 001 0011 010 0101 001 0101 010 0101 011 1001 100 1001 101 1001 110
one or more data bytes. The device address byte includes a Read/Write selection bit. Each access must be terminated by a Stop Condition (STOP). A convention called (ACK) confirms receipt of each byte. Note that SDA can change only during periods when SCL is LOW (SDA changes while SCL is High are reserved for Start and Stop conditions.)
Start Condition (START)
The TCM1617 continuously monitors the SDA and SCL lines for a start condition (a High to Low transition of SDA while SCL is High), and will not respond until this condition is met.
Address Byte
Immediately following the Start Condition, the host must transmit the address byte to the TCM1617. The states of ADD1 and ADD0 during power-up determine the 7-bit SMBus address for the TCM1617. The 7-bit address transmitted in the serial bit stream must match for the TCM1617 to respond with an Acknowledge (indicating the TCM1617 is on the bus and ready to accept data). The eighth bit in the Address Byte is a Read-Write Bit. This bit is 1 for a read operation or 0 for a write operation.
provides the clock signal for all transfers. The TCM1617 always operates as a slave. The serial protocol is illustrated in Figure 3. All data transfers have two phases; all bytes are transferred MSB first. Accesses are initiated by a start condition (START), followed by a device address byte and TCM1617 Serial Bus Conventions
Term Transmitter Receiver Master Explanation The device sending data to the bus. The device receiving data from the bus. The device which controls the bus: initiating transfers (START), generating the clock, and terminating transfers (STOP). The device addressed by the master. A unique condition signaling the beginning of a transfer indicated by SDA falling (High - Low) while SCL is high. A unique condition signaling the end of a transfer indicated by SDA rising (Low - High) while SCL is high. A receiver acknowledges the receipt of each byte with this unique condition. The receiver drives SDA low during SCL high of the ACK clock-pulse. The Master provides the clock pulse for the ACK cycle. Communication is not possible because the bus is in use. When the bus is idle, both SDA and SCL will remain high. The state of SDA must remain stable during the High period of SCL in order for a data bit to be considered valid. SDA only changes state while SCL is low during normal data transfers (see Start and Stop conditions.)
8
Acknowledge (ACK)
Acknowledge (ACK) provides a positive handshake between the host and the TCM1617. The host releases SDA after transmitting eight bits, then generates a ninth clock cycle to allow the TCM1617 to pull the SDA line Low to acknowledge that it successfully received the previous eight bits of data or address.
Slave Start
Data Byte
After a successful ACK of the address byte, the host must next transmit the data byte to be written or clock out the data to be read. (See the appropriate timing diagrams.) ACK will be generated after a successful write of a data byte into the TCM1617.
Stop
ACK
Busy NOT Busy Data Valid
TCM1617-1
2/5/99
2001 Microchip Technology Inc.
DS21485A
SMBus Thermal Sensor with External Diode Input
TCM1617
Write Byte Format S ADDRESS 7 Bits
Slave Address
WR
ACK
COMMAND 8 Bits
ACK
DATA 8 Bits
ACK
P
Command Byte: selects which register you are writing to.
Data Byte: data goes into the register set by the command byte.
Read Byte Format S ADDRESS WR ACK COMMAND ACK S 7 Bits
Slave Address
ADDRESS RD ACK DATA NACK P 7 Bits
Slave Address: repeated due to change in dataflow direction.
8 Bits
Command Byte: selects which register you are reading from.
8 Bits
Data Byte: reads from the register set by the command byte.
Send Byte Format S ADDRESS WR ACK COMMAND ACK P 7 Bits 8 Bits
Command Byte: sends command with no data, usually used for one-shot command.
S = Start Condition P = Stop Condition Shaded = Slave Transmission
Receive Byte Format S ADDRESS RD ACK DATA NACK P 7 Bits 8 Bits
Data Byte: reads data from the register commanded by the last Read Byte.
Figure 3. SMBus Protocols
2001 Microchip Technology Inc.
DS21485A
9
TCM1617-1 2/5/99
SMBus Thermal Sensor with External Diode Input
TCM1617
Stop Condition (STOP)
Communications must be terminated by a stop condition (a Low to High transition of SDA while SCL is High). The Stop Condition must be communicated by the transmitter to the TCM1617. (Refer to TCN75 data sheet for serial bus timing diagrams.)
Configuration Register (Config), 8-Bits, Read/Write
Configuration Register (Config)
D[7] D[6] D[5] Mask1 Chip Stop D[4] D[3] D[2] Reserved D[1] D[0]
REGISTER SET AND PROGRAMMER'S MODEL TCM1617 Command Set
The TCM1617 supports four SMBus command protocols. These are READ_BYTE, WRITE_BYTE, SEND_BYTE, and RECEIVE_BYTE. See System Management Bus Specification Rev. 1.0 for details. Command Byte Description
Command RIT RET RS RC RCR RIHL RILL REHL RELL WC WCR WIHL WILL WEHL WELL OSHT RMID RMREV Code 00h 01h 02h 03h 04h 05h 06h 07h 08h 09h 0Ah 0Bh 0Ch 0Dh 0Eh 0Fh FEh FFh Function Read Internal Temp (INT_TEMP) Read External Temp (EXT_TEMP) Read Status Byte (STATUS) Read Configuration Byte (CONFIG) Read Conversion Rate Byte (CONV_RATE) Read Internal High Limit (INT_HLIM) Read Internal Low Limit (INT_LLIM) Read External High Limit (EXT_HLIM) Read External Low Limit (EXT_LLIM) Write Configuration Byte (CONFIG) Write Conversion Rate Byte (CONV_RATE) Write Internal High Limit (INT_HLIM) Write Internal Low Limit (INT_LLIM) Write External High Limit (EXT_HLIM) Write External Low Limit (EXT_LLIM) One Shot Temp Measurement Read Manufacturer ID (MFR_ID) Read Manufacturer Revision Number (MFR_REV)
Bit
D[7]
POR State Function
0 Interrupt Mask (see text) Standby switch
Operation
1 = mask ALERT#, 0 = don't mask ALERT # 1 = standby, 0 = normal N/A
D[6]
0
D[5] - D[0]
0
Reserved - Always returns zero when read.
A/D Conversion Rate Register (CONV_RATE), 8-Bits, Read/Write
A/D Conversion Rate Register (CONV_RATE)
D[7] D[6] D[5] D[4] Reserved D[3] D[2] MSB D[1] X D[0] LSB
Bit
D[7:3]
POR State Function
0 Reserved - Always returns zero when read. Conversion rate bits.
Operation
N/A
D[2:0]
010b
See below.
A/D Conversion Rate Selection
D2 0 0 0 0 1 1 1 1 D1 0 0 1 1 0 0 1 1 D0 0 1 0 1 0 1 0 1 Conversion Rate Sa/sec 0.0625 0.125 0.25 0.5 1.0 2.0 4.0 8.0
NOTE: Proper device operation is NOT guaranteed if undefined locations (10h to FDh) are addressed. In case of erroneous SMBus operation (RECEIVE_BYTE command issued immediately after WRITE_BYTE command) the TCM1617 will ACKnowledge the address and return 1111 1111b to signify an error. Under no condition will it implement an SMBus "timeout."
NOTE: Conversion rate denotes actual sampling of both internal and external sensors.
TCM1617-1
2/5/99
10
2001 Microchip Technology Inc.
DS21485A
SMBus Thermal Sensor with External Diode Input
TCM1617
Temperature Registers, 8-Bits, Read-Only (INT_TEMP, EXT_TEMP)
The binary value (2's complement format) in these two registers represents temperature of the internal and external sensors following a conversion cycle. The registers are automatically updated in an alternating manner. Internal Temperature Register (INT_TEMP)
D[7] MSB D[6] x D[5] x D[4] x D[3] x D[2] x D[1] x D[0] LSB
Temperature Threshold Setpoint Registers, 8-Bits, Read-Write (INT_HLIM, INT_LLIM, EXT_HLIM, EXT_LLIM)
These registers store the values of the upper and lower temperature setpoints for event detection. The value is in 2's-complement binary. INT_HLIM and INT_LLIM are compared with the INT_TEMP value, and EXT_HLIM and EXT_LLIM are compared with EXT_TEMP. These registers may be written at any time. Internal High Limit Setpoint Register (INT_HLIM)
D[7] MSB D[6] x D[5] x D[4] x D[3] x D[2] x D[1] x D[0] LSB
External Temperature Register (EXT_TEMP) D[7] D[6] D[5] D[4] D[3] D[2] D[1] MSB x x x x x x
D[0] LSB
In the two temperature data and four threshold setpoint registers, each unit value represents one degree (Celsius). The value is in 2's-complement binary format such that a reading of 00000000b corresponds to 0C. Examples of this temperature-to-binary value relationship are shown in the following table. Temperature-to-Digital Value Conversion (INT_TEMP, EXT_TEMP, INT_HLIM, INT_LLIM, EXT_HLIM, EXT_LLIM)
Actual Temperature +130.00C +127.00C +126.50C +25.25C +0.50C +0.25C 0.00C -0.25C -0.50C -0.75C -1.00C -25.00C -25.25C -54.75C -55.00C -65.00C Rounded Temperature +127C +127C +127C +25C +1C 0C 0C 0C 0C -1C -1C -25C -25C -55C -55C -65C Binary Value 01111111 01111111 01111111 00011001 00000001 00000000 00000000 00000000 00000000 11111111 11111111 11100111 11100110 11001001 11001001 10111111 Hex Value 7F 7F 7F 19 01 00 00 00 00 FF FF E7 E7 C9 C9 BF
Internal Low Limit Setpoint Register (INT_LLIM) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB x x x x x x LSB
External High Limit Setpoint Register (EXT_HLIM)
D[7] MSB D[6] x D[5] x D[4] x D[3] x D[2] x D[1] x D[0] LSB
External Low Limit Setpoint Register (EXT_LLIM)
D[7] MSB D[6] x D[5] x D[4] x D[3] x D[2] x D[1] x D[0] LSB
NOTE: POR states: INT_HLIM INT_LLIM EXT_HLIM EXT_LLIM
01111111b 11001001b 01111111b 11001001b
+127C -55C +127C -55C
2001 Microchip Technology Inc.
DS21485A
11
TCM1617-1 2/5/99
SMBus Thermal Sensor with External Diode Input
TCM1617
Status Register (Status), 8-Bits, Read Only:
Status Register (Status)
D[7] Busy D[6] Flag1 D[5] D[4] Flag2 Flag3 D[3] D[2] Flag4 Flag5 D[1] D[0] Reserved
Register Set Summary:
The TCM1617's register set is summarized below. All registers are 8-bits wide. Name
INT_TEMP
Description
POR State
0000 0000b*
Read Write
Bit
D[7] D[6] D[5] D[4] D[3] D[2] D[1:0]
POR State
0 0 0 0 0 0 0
Function
Signal A/D converter is busy. Interrupt flag for INT_HLIM event Interrupt flag for INT_LLIM event Interrupt flag for EXT_HLIM event Interrupt flag for EXT_LLIM event External diode "fault" flag Reserved - Always returns zero.
Operation*
1 = A/D busy, 0 = A/D idle 1 = interrupt occurred, 0 = none 1 = interrupt occurred, 0 = none 1 = interrupt occurred, 0 = none 1 = interrupt occurred, 0 = none 1 = external diode fault, 0 = external diode OK N/A
NOTE: All status bits are cleared after a read operation is performed on STATUS. The EXT_TEMP register will read +127C if an external diode "open" is detected.
Manufacturer's Identification Register (MFR_ID), 8-Bits, Read Only:
Manufacturer's Identification Register (MFR_ID)
D[7] MSB D[6] X D[5] X D[4] X D[3] X D[2] X D[1] X D[0] LSB
Internal sensor temperature (2's complement) EXT_TEMP External sensor temperature (2's complement) STATUS STATUS register CONFIG CONFIG register CONV_RATE A/D conversion rate register INT_HLIM Internal high limit (2's complement) INT_LLIM Internal low limit (2's complement) EXT_HLIM External high limit (2's complement) EXT_LLIM External low limit (2's complement) MFR_ID ASCII for letter "T" (Microchip) MFR_REV Serial device revision#
0000 0000b*
0000 0000b 0000 0000b 0000 0010b 0111 1111b

1100 1001b
0111 1111b
1100 1001b
0101 0100b **

Manufacturer's Revision Register (MFR_REV), 8-Bits, Read Only:
Manufacturer's Revision Register (MFR_REV)
D[7] MSB D[6] X D[5] X D[4] X D[3] X D[2] X D[1] X D[0] LSB
NOTE: *The INT_TEMP and EXT_TEMP register immediately will be updated by the A/D converter after POR. If STBY# is low at powerup, INT_TEMP and EXT_TEMP will remain in POR state (0000 0000b). **MFR_REV will sequence 01h, 02h, 03h, etc. by masking changes.
TCM1617-1
2/5/99
12
2001 Microchip Technology Inc.
DS21485A
SMBus Thermal Sensor with External Diode Input
TCM1617
PACKAGE DIMENSIONS
16-Pin QSOP (Narrow)
PIN 1
.157 (3.99) .150 (3.81) .244 (6.20) .228 (5.80)
.196 (4.98) .189 (4.80)
.010 (0.25) .004 (0.10) .069 (1.75) .053 (1.35) 8 MAX. .050 (1.27) .016 (0.41)
.010 (0.25) .007 (0.19)
.025 (0.635) TYP.
.012 (0.31) .008 (0.21)
Dimensions: inches (mm)
2001 Microchip Technology Inc.
DS21485A
13
TCM1617-1 2/5/99
SMBus Thermal Sensor with External Diode Input
TCM1617
WORLDWIDE SALES AND SERVICE
AMERICAS
Corporate Office
2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com
New York
150 Motor Parkway, Suite 202 Hauppauge, NY 11788 Tel: 631-273-5305 Fax: 631-273-5335
ASIA/PACIFIC (continued)
Singapore
Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-334-8870 Fax: 65-334-8850
San Jose
Microchip Technology Inc. 2107 North First Street, Suite 590 San Jose, CA 95131 Tel: 408-436-7950 Fax: 408-436-7955
Rocky Mountain
2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-7456
Taiwan
Microchip Technology Taiwan 11F-3, No. 207 Tung Hua North Road Taipei, 105, Taiwan Tel: 886-2-2717-7175 Fax: 886-2-2545-0139
Toronto
6285 Northam Drive, Suite 108 Mississauga, Ontario L4V 1X5, Canada Tel: 905-673-0699 Fax: 905-673-6509
Atlanta
500 Sugar Mill Road, Suite 200B Atlanta, GA 30350 Tel: 770-640-0034 Fax: 770-640-0307
ASIA/PACIFIC
China - Beijing
Microchip Technology Beijing Office Unit 915 New China Hong Kong Manhattan Bldg. No. 6 Chaoyangmen Beidajie Beijing, 100027, No. China Tel: 86-10-85282100 Fax: 86-10-85282104
Austin
Analog Product Sales 8303 MoPac Expressway North Suite A-201 Austin, TX 78759 Tel: 512-345-2030 Fax: 512-345-6085
EUROPE
Australia
Microchip Technology Australia Pty Ltd Suite 22, 41 Rawson Street Epping 2121, NSW Australia Tel: 61-2-9868-6733 Fax: 61-2-9868-6755
Boston
2 Lan Drive, Suite 120 Westford, MA 01886 Tel: 978-692-3848 Fax: 978-692-3821
China - Shanghai
Microchip Technology Shanghai Office Room 701, Bldg. B Far East International Plaza No. 317 Xian Xia Road Shanghai, 200051 Tel: 86-21-6275-5700 Fax: 86-21-6275-5060
Denmark
Microchip Technology Denmark ApS Regus Business Centre Lautrup hoj 1-3 Ballerup DK-2750 Denmark Tel: 45 4420 9895 Fax: 45 4420 9910
Boston
Analog Product Sales Unit A-8-1 Millbrook Tarry Condominium 97 Lowell Road Concord, MA 01742 Tel: 978-371-6400 Fax: 978-371-0050
France
Arizona Microchip Technology SARL Parc diActivite du Moulin de Massy 43 Rue du Saule Trapu Batiment A - ler Etage 91300 Massy, France Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Hong Kong
Microchip Asia Pacific RM 2101, Tower 2, Metroplaza 223 Hing Fong Road Kwai Fong, N.T., Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431
Chicago
333 Pierce Road, Suite 180 Itasca, IL 60143 Tel: 630-285-0071 Fax: 630-285-0075
Dallas
4570 Westgrove Drive, Suite 160 Addison, TX 75001 Tel: 972-818-7423 Fax: 972-818-2924
India
Microchip Technology Inc. India Liaison Office Divyasree Chambers 1 Floor, Wing A (A3/A4) No. 11, OiShaugnessey Road Bangalore, 560 025, India Tel: 91-80-2290061 Fax: 91-80-2290062
Germany
Arizona Microchip Technology GmbH Gustav-Heinemann Ring 125 D-81739 Munich, Germany Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
Dayton
Two Prestige Place, Suite 130 Miamisburg, OH 45342 Tel: 937-291-1654 Fax: 937-291-9175
Germany
Analog Product Sales Lochhamer Strasse 13 D-82152 Martinsried, Germany Tel: 49-89-895650-0 Fax: 49-89-895650-22
Detroit
Tri-Atria Office Building 32255 Northwestern Highway, Suite 190 Farmington Hills, MI 48334 Tel: 248-538-2250 Fax: 248-538-2260
Japan
Microchip Technology Intl. Inc. Benex S-1 6F 3-18-20, Shinyokohama Kohoku-Ku, Yokohama-shi Kanagawa, 222-0033, Japan Tel: 81-45-471- 6166 Fax: 81-45-471-6122
Italy
Arizona Microchip Technology SRL Centro Direzionale Colleoni Palazzo Taurus 1 V. Le Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883
Los Angeles
18201 Von Karman, Suite 1090 Irvine, CA 92612 Tel: 949-263-1888 Fax: 949-263-1338
Korea
Microchip Technology Korea 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku Seoul, Korea Tel: 82-2-554-7200 Fax: 82-2-558-5934
United Kingdom
Arizona Microchip Technology Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 Printed on recycled paper.
01/09/01
Mountain View
Analog Product Sales 1300 Terra Bella Avenue Mountain View, CA 94043-1836 Tel: 650-968-9241 Fax: 650-967-1590
All rights reserved. (c) 2001 Microchip Technology Incorporated. Printed in the USA. 1/01
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchipis products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellectual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. All rights reserved. All other trademarks mentioned herein are the property of their respective companies.
TCM1617-1
2/5/99
14
2001 Microchip Technology Inc.
DS21485A

▲Up To Search▲

Price & Availability of TCM1617

	To Download TCM1617 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .