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Input/Output Connector Description
3 Input/Output Connector Description
This section describes the jumpers and connectors on the EVM, as well as how to properly connect, set
up, and use the TPS65023B/TPS650231EVM-664.
J1 – VIN
Input voltage from external power supply, recommended maximum 5.5 V. Input current depends
on load but typically is less than 2 A.
J2 – GND
This is the return connection for VIN.
J3 – VINLDO/GND
Input voltage and return for LDO1 and LDO2. Resistor R20 connects this pin to VIN. If an
external power supply is used, remove R20. Recommended maximum input voltage is 5.5 V.
J4 – VSYSIN/GND
Input voltage and return for VSYSIN, one of the input voltages for RTC. Resistor R21 can be
used to connect this input to VIN. If an external power supply is used, remove R21.
Recommended maximum input voltage is 4 V.
J5 – VBACKUP/GND
Input voltage and return for VBACKUP, one of the input voltages for RTC. There are no onboard
connections to a voltage input. Recommended maximum input voltage is 4 V.
J6 – VRTC/GND
Output voltage from RTC circuit.
J7 – Fault Outputs
Four fault outputs are available on this connector:
PWRFAIL – Fault occurs when input voltage is less than 3 V. Pulled up to VRTC when safe; low
for fail.
INT – Fault occurs when a fail is on an input or output voltage; acts as a sum fail. Pulled up to
VIN when safe; low for fail.
RESPWRON – Low reset signal is controlled by SW1, 144 ms. Pulled up to VIN normally.
LOWBAT – Fault occurs when input voltage is less than 3.6 V. Pulled up to VIN when safe; low
for fail.
J8 – I2C
This header duplicates the I2C signals from the J20 interface connector. I2C data (SDA) and
clock (SCL) can be accessed on this header
J9 – VDCDC1
Output from DCDC1 switching regulator maximum output current 1.7 A; default voltage setting is
3.3 V.
J10 – GND
Return for VDCDC1.
J11 – VDCDC2
Output from DCDC2 switching regulator; maximum output current 1.2 A.
J12 – GND
Return for VDCDC2
J13 – VLDO1
Output from low-dropout regulator VLDO1; maximum output current 200 mA.
J14 – GND
Return for VLDO1
J15 – VLDO2
Output from low-dropout regulator VLDO2; maximum output current 200 mA.
J16 – GND
Return for VLDO2.
3
SLVU394–October 2010 TPS65023B/TPS650231EVM
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