Setup
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6SLVUBF3A–May 2018–Revised August 2018
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TPS65987-90 Evaluation Module
2.5 Switches
Table 5,Table 6, and Table 7 lists the TPS65987-90EVM switches. For S1, make sure to leave all six
switches in the ON position (to the right) for flashing a project and debugging. For S4 Switch: EVM out of
th box should have S4->4 (BP_WaitFor3V3_Internal) as on(right). This ensures that PD controller enables
internal paths in dead battery mode. This switch can be turned off(left) if EVM is used as source only.
Table 5. S1 Switch Bank
Switch (S1) Description
1: SPI_CLK Connects SPI_CLK node from FTDI to TPS65987D, EEPROM when the switch is in the ON position (to the
right), and disconnects when in the OFF position (to the left)
2: SPI_MOSI Connects SPI_MOSI node from FTDI to TPS65987D, EEPROM when the switch is in the ON position (to
the right), and disconnects when in the OFF position (to the left)
3: SPI_MISO Connects SPI_MISO node from FTDI to TPS65987D, EEPROM when the switch is in the ON position (to
the right), and disconnects when in the OFF position (to the left)
4: SPI_CSZ Connects SPI_CSZ node from FTDI to TPS65987D, EEPROM when the switch is in the ON position (to the
right), and disconnects when in the OFF position (to the left)
5: I2C_SCL Connects I2C_SCL node from FTDI to TPS65987D, EEPROM when the switch is in the ON position (to the
right), and disconnects when in the OFF position (to the left)
6: I2C_SDA Connects I2C_SDA node from FTDI to TPS65987D, EEPROM when the switch is in the ON position (to the
right), and disconnects when in the OFF position (to the left)
Table 6. S4 Switch Bank
Switch (S4) Description
1, 2, 3 OFF I2C address selection: 000b
1 ON Only I2C address selection: 001b
2 ON Only I2C address selection: 010b
3 ON Only I2C address selection: 011b
4, 5, 6 OFF Dead battery mode: BP_NoResponse
4 ON Only Dead battery mode: BP_WaitFor3V3_Internal
5 ON Only Dead battery mode: BP_WaitFor3V3_External
6 ON Only Dead battery mode: BP_NoWait
Table 7. Push Buttons
Designator Label Description
S2 PD Reset This switch is a push-button that pulls the HRESET pin (44) of the TPS65987D device high
when pressed. Releasing the push-button pulsl HRESET low again, and the TPS65987D
device goes through a soft reset, which consists of reloading firmware from RAM. If a valid
configuration is present in RAM, the TPS65988 device will not reload configuration from the
external flash.
S3 Disable Flash
Config This push button switch will hold the SPI Miso line to GND. Use this button when booting the
device. If this button is pressed when the device is booting, the TPS65987D device does not
load its configuration from the SPI Flash and instead boots into a default ROM configuration.
