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3 BoosterPack
™
Operation
BoosterPack headers ( J5, J10 ) are used to communicate with TPS274C65's SPI interface. The header can
be used to easily communicate with a Texas Instruments microcontroller, or can be paired with a custom
microcontroller with jumper wires. A list of pins connected to the BoosterPack header can be seen below in
Table
3-1 :
Table 3-1. Connected BoosterPack
™
Header Pins on TPS274C65EVM
BoosterPack Pin Function Note
1 3.3-V power rail 3.3-V output from microcontroller
6
Current sensing through the SNS pin for version BS
(current sense for AS is through SPI line)
Optional for AS
7 SPI CLK from microcontroller The maximum SPI clock rate is 10MHz
12 CS_IC from microcontroller SPI chip select
14 SDI_BP
Serial data input for microcontroller , must be connected to
SDO of the IC if using addressable SPI. Alternatively, it can be
connected to SDI of the IC for daisy chain operations.
15 SDO_BP
Serial data input for microcontroller , must be connected to
SDI of the IC if using addressable SPI. Alternatively, it can be
connected to SDO of the IC for daisy chain operations.
17 Configure DO_EN pin Setting this pin low disables ALL the inputs.
18 Configure DSPI pin
Pulling this pin high enables daisy chain SPI mode. Pulling
this pin low enables addressable SPI mode.
33 READY pin output from IC
Logic low output indicating the IC is ready for SPI
communication.
34 FAULT pin output from IC
Optional for AS and BS as the fault output is available through
SPI
Note that there are no series resistors with I/O ports for reverse current protection due to the high speed of SPI
communications. Please use diode or TI's ideal diode solutions for reverse current protection.
To power the attached LaunchPad from the on-board buck converter of the TPS274C65EVM, use a 1 × 3 shunt
to connect
J16 . Note that this feeds the output of the buck converter on the TPS274C65EVM into the 3.3-V rail
on the LaunchPad. If there is another power supply trying to power the LaunchPad (such as the integrated USB
power on the LaunchPad itself) this can potentially cause issues with the separate power sources fighting for
contention.
Jumpers J14 is used to manually configure the control signals going into the TPS274C65. When using a
microcontroller to control these signals, these jumpers must be unpopulated to allow for the microcontroller to
drive them high or low.
The current sense value can be reported digitally through internal ADC. However, current sense value can be
read directly without SPI through pin 34. Please make sure
D3 is populated to clamp the pin voltage properly.
BoosterPack
™
Operation www.ti.com
4 TPS274C65 Evaluation Module SLVUCI0 – MAY 2022
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