Texas Instruments TPS65988EVM, User Manual

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5.1.4 S6 SPI MISO Pull Down Button
S6 is located on the top right corner of the EVM. This push button switch holds the SPI Miso line to GND. This
button is to be used when booting the device. If this button is pressed when the device is booting, the TPS65988
does not load its configuration from the SPI Flash, but instead boots into a default ROM configuration.
Figure 5-12. SPI-MISO Pull Down Switch
5.1.5 S3: FTDI ® Enable and Disable
The dip switch, S3, has 4 switches. The switches labeled 3.3V (switch 3) and 5V (switch 4) pass the supply from
the FTDI board micro-B receptacle from the BoosterPack header (J6) and vice versa. The
Force Enable (switch
1 and switch 2) switch controls the reset on the FTDI device. When switch 1 is closed, the FTDI is held in reset
until the TPS65988 has successfully loaded the firmware. When switch 2 is closed, the FTDI can be reset
externally by pin 8 on the FTDI board header J7. By default, all switches are opened and in the upward position.
Figure 5-13 highlights these features.
GND
0 R203
DNP
0 R206
DNP
0 R212
0 R215
0 R218
0 R222
0 R204
DNP
0 R207
DNP
0 R209
DNP
0 R219
0 R223
1.00k
R195
F_SPI_CLK
F_I2C_IRQ2
F_I2C_SCL2
F_I2C_SDA2
F_SYSTEM_3V3
F_SYSTEM_3V3
F_5V_VBUS
F_SWD_CLK
F_SWD_DATA
F_C_UART_RX
F_C_UART_TX
1
3
5
6
4
2
7
9
10
8
12 11
14 13
16 15
18 17
20 19
J6
6 3
1 8
2 7
5 4
S3
F_RESETN RESETN
F_I2C_IRQ1
White
1 2
D26
10.0k
R314
GND
3
1
2
Q28
I2C1_SCL
I2C1_SDA
Figure 5-13. FTDI ® Dip Switch (S3) Schematic
Setup www.ti.com
12 TPS65988 Evaluation Module SLVUB62B – JUNE 2017 – REVISED NOVEMBER 2020
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