SLVUCI0 May 2022 TPS274C65
BoosterPack plug-in module 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 plug-in module header can be seen below in Table 3-1:
| BoosterPack Plug-in Module 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.