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19-4779; Rev 0; 8/98
Supervisory Circuit Evaluation Kit
General Description
Maxim's line of supervisory circuits offers multiple wafer trimmable options, leading to thousands of variations. The large number of variations makes it difficult to offer samples for each unique version. The Supervisory Circuit Evaluation Kit (SUPEVKIT) has been developed to emulate all the different variations of the MAX63XX line. It reproduces the logic of this line but not the electrical characteristics. Any device in these product families can be emulated simply by changing jumper settings and using a capacitor, if required. The SUPEVKIT supports the following MAX63XX devices:
MAX6305 MAX6306 MAX6307 MAX6308 MAX6309 MAX6310 MAX6311 MAX6312 MAX6313 MAX6314 MAX6315 MAX6316L MAX6316M MAX6317H MAX6318LH MAX6318MH MAX6319LH MAX6319MH MAX6320P MAX6321HP MAX6322HP MAX6326 MAX6327 MAX6328 MAX6332* MAX6333* MAX6334* MAX6335* MAX6336* MAX6337* PART SUPEVKIT
Features
o Easy to Configure o Five Reset Outputs Bidirectional RESET Open-Drain RESET Push/Pull RESET Push/Pull RESET Open-Drain RESET o Adjustable Reset Timeout o Manual Reset Input o Adjustable Under/Overvoltage Supply Monitoring o Adjustable Watchdog Timeout o Reset Valid Down to VCC = 1V o Immune to Short Negative-Going VCC Transients o Assembled and Tested
SUPEVKIT
Ordering Information
TEMPERATURE +25C
*Future product--contact factory for availability.
Component Suppliers
SUPPLIER Central Semiconductor Taiyo Yuden PHONE 515-435-1110 408-573-4150 FAX 515-435-1824 408-573-4159
Component List
DESIGNATION QTY C1 C2 C3, C4 C5 C6 C7 JU1, JU2 JU3, JU4, JU5 R1, R8 R2, R9 1 0 0 1 1 1 2 3 2 2 DESCRIPTION 470pF, 20% ceramic capacitor Not installed (user supplied) Not installed (user supplied) 0.01F, 20% ceramic capacitor 0.068F, 20% ceramic capacitor 0.47F, 10% ceramic capacitor Taiyo Yuden TMK316BJ474KL 3-pin jumpers 2-pin jumpers 30k, 5% resistors 39k, 5% resistors DESIGNATION QTY R3, R4, R5, R10, R13, R16 R6, R7 R11, R12, R14, R15, R17 R18, R19 Q1 Q2-Q5 U1 U2 U3 6 2 5 2 1 4 1 1 1 DESCRIPTION 10k, 5% resistors 1M, 5% resistors 100k, 5% resistors 100k trimmer potentiometers 2N3906 PNP transistor Central Semiconductor CMPT3906 2N3904 NPN transistors Central Semiconductor CMPT3904 MAX969EEE MAX6303CUA MAX6314US26D1-T 1
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
Supervisory Circuit Evaluation Kit SUPEVKIT
Quick Start
Before you begin, you will need the following equipment: to 0. The reset threshold voltage on the SUPEVKIT is now set. 8) Connect the SUPEVKIT to the test circuit, using the device inputs and outputs listed in Table 1. Example: The MAX6320PUK33BX-T uses pads MR, WDI, and RESETOD.
* A 1V to 5.5V variable DC power supply * A voltmeter * A trimmer potentiometer adjustment tool (small
flat-blade screwdriver) Table 1 lists the features that can be emulated by the SUPEVKIT. Refer to the corresponding device's data sheet to look up the specifications for these features. To configure the supervisory circuit, take the following steps: 1) Install jumpers JU2-JU5 in the positions listed in Table 1. Example: For the MAX6320PUK33BX-T, the jumper settings are JU2 = 2-3, JU3 = open, JU4 = closed, and JU5 = closed. 2) Set the reset timeout period, referring to Table 2 to determine which trace (if any) needs to be cut. Example: For the MAX6320PUK33BX-T, the reset timeout period is 20ms, so it is necessary to cut the trace between C5 and C6. 3) If the selected supervisory circuit has a watchdog timeout feature, consult Table 3 to determine which capacitor value to use for C2 and which position to use for jumper JU1. Example: For the MAX6320PUK33BX-T, the watchdog timeout period is 71ms. Use a value of 0.039F for capacitor C2. Jumper JU1 should be in the 2-3 position. 4) Turn on the power supply and connect it to the voltmeter. Set the power-supply voltage to the desired reset threshold voltage. The accuracy of the trip threshold is determined by the accuracy of the voltmeter. Example: For the MAX6320PUK33BX-T, set the power supply to 3.30V. 5) Connect the power supply to the SUPEVKIT at the pads labeled VCC and GND. The SUPEVKIT operates from +1V to +5.5V. The supply voltage must not exceed +5.5V. 6) Connect the voltmeter to the pads labeled TP and GND. 7) Turn potentiometer R18 clockwise until the voltmeter reading goes high (approximately equal to VCC). Then slowly turn potentiometer R18 counterclockwise until the voltmeter reading decreases
2
Detailed Description
Watchdog Circuit
A watchdog circuit consists of an input (WDI) and an output (RESET). If WDI is not toggled within the watchdog timeout period (which is a predetermined amount of time), then a RESET is issued. Disable the watchdog function by installing jumper JU3. Capacitor C2 selects the watchdog timeout period. To choose a value for this capacitor, refer to Table 3 or use the following formula: C2 = tWD / 2.67 where tWD is the watchdog timeout period in s and C2 is in pF. The SUPEVKIT features two modes of watchdog timer operation: normal mode and extended mode. In normal mode (JU1 = 2-3), the formula shown above determines the watchdog timeout period. In extended mode (JU1 = 1-2), the watchdog timeout (tWD) is multiplied by a factor of 500. Note: In extended mode operation, leaving pad WDI floating disables the watchdog feature.
Reset Outputs
The SUPEVKIT has five reset outputs: active-low push/pull (RESET), active-low bidirectional (RESETBD), active-low open-drain (RESETOD), active-high push/pull (RESET), and active-high open-drain (RESETOD). These outputs are valid down to VCC = 1V. The reset timeout period is the amount of time RESET is asserted after VCC rises above the reset threshold voltage. Capacitors C1, C5, C6, and C7 set the reset timeout period. The SUPEVKIT comes with the period set at 1120ms. To change the period to either 1ms, 20ms, or 140ms, cut a PC board trace as specified in Table 2. The bidirectional reset output of the SUPEVKIT is valid only for reset threshold voltages down to 2.63V.
Undervoltage Setup
Potentiometer R18 sets the undervoltage reset threshold. To enable the undervoltage reset feature, install the jumpers in the positions specified in Table 4. Use a voltmeter to set the power-supply voltage to the desired trip
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Supervisory Circuit Evaluation Kit SUPEVKIT
Table 1. Devices and Settings
DEVICE INPUTS OVERSTIN RSTIN1 RSTIN2 DEVICE DEVICE OUTPUTS RESETOD RESETOD RESETBD INSTALL ADJUST RESET RESET USER SETTINGS
WDI
JU2
JU4
MAX6305 MAX6306 MAX6307 MAX6308 MAX6309 MAX6310 MAX6311 MAX6312 MAX6313 MAX6314 MAX6315 MAX6316L MAX6316M MAX6317H MAX6318LH MAX6318MH MAX6319LH MAX6319MH MAX6320P MAX6321HP MAX6322HP MAX6326 MAX6327 MAX6328 MAX6332 MAX6333 MAX6334 MAX6335 MAX6336 MAX6337
X
X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
X X X R18 R18 R18 R18 R18 R18 X X C2 X C2 C2 C2 X X X X X C2 C2 C2 R18 R18 R18 R18 R18 R18 R18 R18 R18 R18 R18 R18 R18 R18 X X X X X X X X X X R18 R18 R18 R18 R18 R18 R18
2-3 2-3 open 2-3 2-3 open 2-3 2-3 open 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3 2-3
closed closed closed closed closed closed closed closed closed closed closed open open open open open closed closed open open closed closed closed closed closed closed closed closed closed closed
JU3
open closed closed open closed closed open closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed
open open open open open open open open open closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed closed
X
X X X
X
X X X
Note: All devices require VCC and GND connections.
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JU5 3
MR
Supervisory Circuit Evaluation Kit SUPEVKIT
voltage. Connect a voltmeter or oscilloscope to the TP pad. Turn R18 clockwise until the voltage at TP goes high (VCC). Slowly turn R18 counterclockwise until the voltage goes low. The SUPEVKIT is now set to trip when the supply voltage decreases to this voltage. To disable undervoltage reset, open jumper JU4.
Table 4. Undervoltage Setup
JUMPER JU2 JU3 JU4 JU5 STATE 2-3 Closed Closed Closed
Overvoltage Setup
Potentiometer R19 sets the overvoltage reset threshold. To enable the overvoltage reset feature, install the jumpers in the positions specified in Table 5. Use a voltmeter to set the power-supply voltage to the desired trip voltage. Connect a voltmeter or oscilloscope to the TP pad. Turn R19 clockwise until the voltage at TP goes high (VCC). Slowly turn R19 counterclockwise until the voltage goes low. The SUPEVKIT is now set to trip when the supply voltage increases to this voltage. To disable overvoltage reset, move JU2's shunt to position 2-3. Note: If the voltage at TP does not pull high after turning R19 clockwise for 14 turns, turn R18 counterclockwise. The undervoltage trip point might be set higher than the supply voltage, holding the SUPEVKIT in reset.
Table 5. Overvoltage Setup
JUMPER JU2 JU3 JU4 JU5 STATE 1-2 Closed Closed Closed
Table 6. Jumper Function Table
JUMPER STATE 1-2 JU1 2-3* FUNCTION Watchdog-select connected to VCC (extended mode). Watchdog-select connected to GND (normal mode). Use R19 to set overvoltage threshold. Disable overvoltage comparator. Use OVRSTIN pad. Use watchdog function (insert C2). Disable watchdog function. Use RSTIN1 pad. Use R18 to set undervoltage threshold. Use RSTIN2 pad. Disable RSTIN2 undervoltage comparator.
Negative-Going VCC Transients
The SUPEVKIT is relatively immune to short-duration negative-going transients (glitches). If more immunity is required, install 0.1F bypass capacitors for C3 and C4.
Table 2. Selecting the Reset Timeout Period
MINIMUM TIMEOUT PERIOD (ms) 1 20 140 1120 *Default jumper state. CUT TRACE BETWEEN: C1 and C5 C5 and C6 C6 and C7 No cutting necessary*
1-2 JU2 2-3* Open JU3 JU4 Open Closed* Open Closed* Open JU5 Closed*
*Default jumper state.
Table 3. Capacitance Values for Common Watchdog Timeout Periods
MINIMUM WATCHDOG TIMEOUT (tWD) 4.3ms 71ms 1.12sec 17.9sec 4 C1 VALUE 2200pF 20% 0.039F 20% 1200pF 20% 0.018F 20% JU1 STATE 2-3 2-3 1-2 1-2
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Supervisory Circuit Evaluation Kit SUPEVKIT
Pad Description
PAD NAME VCC GND WDI RSTIN1 RSTIN2 OVRSTIN MR RESET RESETOD DESCRIPTION Supply Voltage and Reset Threshold Monitor Input (1V to 5.5V) Ground Watchdog Input. A rising or falling transition must occur on this input within the selected watchdog timeout period, or a reset will occur. Undervoltage Reset Comparator Input. Asserts reset when the monitored voltage falls below the programmed threshold. Set the reset threshold with an external resistor-divider. Undervoltage Reset Comparator Input. Asserts reset when the monitored voltage falls below the programmed threshold. Set the reset threshold with an external resistor-divider. Overvoltage Reset Comparator Input. Asserts reset when the monitored voltage exceeds the programmed threshold. Set the reset threshold with an external resistor-divider. Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is low, and for the duration of the reset timeout period (tRP) after the reset condition is terminated. Push/Pull, Active-High Reset Output. RESET changes from low to high whenever a reset condition occurs. After the reset condition is terminated, RESET remains high for the duration of the reset timeout period and then goes low. Open-Drain, Active-High Reset Output. RESETOD is asserted high whenever a reset condition occurs. After the reset condition is terminated, RESETOD remains high for the duration of the reset timeout period. Push/Pull, Active-Low Reset Output. RESET changes from high to low whenever a reset condition occurs. RESET remains low for the duration of the reset timeout period. After the reset condition is terminated, RESET remains low for the duration of the timeout period and then goes high. Open-Drain, Active-Low Reset Output. RESETOD is asserted low whenever a reset condition occurs. After the reset condition is terminated, RESETOD remains low for the duration of the reset timeout period. Bidirectional, Active-Low Reset Output. RESETBD changes from high to low whenever a reset condition occurs. After the reset condition is terminated, RESETBD remains low for the duration of the reset timeout period and then goes high. In addition to the normal N-channel pull-down, RESETBD has a P-channel pull-up transistor in parallel with a 4.7k resistor to facilitate connection to Ps with bidirectional resets. See the MAX6314 data sheet.
RESET
RESETOD
RESETBD
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5
SUPEVKIT
Supervisory Circuit Evaluation Kit
Figure 1. SUPEVKIT Schematic
VCC VCC VCC C4 7 WDI MR GND 1 3 RESET RESET 4 VCC U3 1 RESETIN RESET VCC 8 VCC GND GND 2
6
MAX6314
2 RESETBD R10 10k 3 C1 470pF C6 0.068F 4 JU3 VCC R11 100k VCC R16 10k RESET R9 39k R5 10k R12 100k VCC R7 1M Q1 R17 100k RESETOD Q4 R15 100k JU1 1 2 3 R13 10k R14 100k Q3 RESETOD Q5 SWT WDS 5 VCC C3 C2 3 1 VCC OUTC 15 OVRSTIN R19 100k JU2 VCC VCC R4 10k 11 MR INC+ INC10 R6 1M 6 7 INB8 INB+ REF 1.235V REF GND HYST 9 14 1 2 3 R8 30k OUTD 2 OUTB OUTA 16 C7 0.47F C5 0.01F SRT
U2
WDI VCC
6
VCC
MAX6303
TP
Q2
VCC
RSTIN1 4 13 12 5 INAINA+ IND+ IND-
R1 30k
R18 JU4
VCC
100k
R3 10k
R2 39k
JU5
+
U1 MAX969
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RSTIN2
Supervisory Circuit Evaluation Kit SUPEVKIT
1.0"
Figure 2. SUPEVKIT Component Placement Guide-- Component Side
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7
Supervisory Circuit Evaluation Kit SUPEVKIT
1.0"
Figure 3. SUPEVKIT PC Board Layout--Component Side
1.0"
Figure 4. SUPEVKIT PC Board Layout--Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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