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3
Test Point Descriptions
Wire-loop test points and scope probe test points are provide as convenient connection points for digital
voltmeters (DVM) or oscilloscope probes to aid in the evaluation of the module. A description of each test
point follows.
VIN RS+, VIN RS-
VIN DVM, DVM GND
VIN MON (J5)
VOUTA, GNDA
VOUTB, GNDB
VOUTA S+, S-
VOUT_A MON (J6)
VOUTB S+, S-
VOUT_B MON (J7)
RESET
A_PGD
B_PGD
CLK
DATA
ALERT
A_EN (J8)
B_EN (J9)
GND
5V, 3V3
A_Trans In (J11)
A_Imon (J12)
B_Trans In (J13)
B_Imon (J14)
SNAU240 – August 2018
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Table 1. Test Points
Remote sense connection points for host input supply. Use these to maintain the desired input voltage at
the input to the module.
Input voltage monitor. Connect a DVM across these points to measure efficiency.
Input voltage scope monitor. Connect an oscilloscope to this set of points to measure input ripple.
VOUT_A output voltage monitor. Connect a DVM across these points to measure efficiency.
VOUT_B output voltage monitor. Connect a DVM across these points to measure efficiency.
VOUT_A remote sense points. Connect a DVM across these points to measure load and line regulation.
VOUT_A output voltage scope monitor. Connect an oscilloscope to this set of points to measure output
ripple and transient response.
VOUT_B remote sense points. Connect a DVM across these points to measure load and line regulation.
VOUT_B output voltage scope monitor. Connect an oscilloscope to this set of points to measure output
ripple and transient response.
Module reset pin. Normally high. Pull low to reset module to default VOUT values.
VOUT_A Power Good. Open drain signal pulled up via a 10k to 3.3V. When high, VOUT_A is converting
power with no faults detected.
VOUT_B Power Good. Open drain signal pulled up via a 10k to 3.3V. When high, VOUT_B is converting
power with no faults detected.
PMBus CLK line. Used to monitor the CLK signal.
PMBus DATA line. Used to monitor the DATA signal.
PMBus ALERT line. Used to monitor the ALERT signal.
VOUT_A enable pin. Open drain signal pulled up via a 10k to 3.3V. When jumper is removed, VOUT_A is
allowed to convert power. Place a jumper across both pins to stop power conversion. Note that the USB to
GPIO pod can also control this pin.
VOUT_B enable pin. Open drain signal pulled up via a 10k to 3.3V. When jumper is removed, VOUT_B is
allowed to convert power. Place a jumper across both pins to stop power conversion. Note that the USB to
GPIO pod can also control this pin.
Convenience GND connection for DVMs or scope probes.
Monitor points for on-board 5V and 3.3V bias rails generated by the EVM. These voltages are used for pull-
up resistors and the fast transient generation circuitry. These do not monitor the bias rails on the
TPSM831D31 module.
SMB jack input from external function generator to drive the VOUT_A fast transient generator.
SMB jack for current monitor output of VOUT_A transient generator. 3mV/A, 50Ω output impedance.
SMB jack input from external function generator to drive the VOUT_B fast transient generator.
SMB jack for current monitor output of VOUT_B transient generator. 3mV/A, 50Ω output impedance.
Copyright © 2018, Texas Instruments Incorporated
Using the TPSM831D31 Power Module Evaluation Module
Test Point Descriptions
5
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