CYW20738
Table 9. GPIO Pin Descriptionsa (Cont.)
Pin Number
Default Di-
rection
Power Do-
main
Pin Name
After POR
Alternate Function Description
40-pin
QFN
64-pin
BGA
–
E3
P23
Input
Floating
VDDO ■ GPIO: P23
■ Keyboard scan output (column): KSO15
■ A/D converter input
33
A7
P24
P25
Input
Floating
VDDO ■ GPIO: P24
■ Keyboard scan output (column): KSO16
■ SPI_2: SPI_CLK (master and slave)
■ SPI_1: MISO (master only)
■ Peripheral UART: puart_tx
32
38
B7
A4
Input
Input
Floating
Floating
VDDO ■ GPIO: P25
■ Keyboard scan output (column): KSO17
■ SPI_2: MISO (master and slave)
■ Peripheral UART: puart_rx
P26
VDDO ■ GPIO: P26
PWM0
■ Keyboard scan output (column): KSO18
■ SPI_2: SPI_CS (slave only)
■ SPI_1: MISO (master only)
■ Optical control output: QOC0
■ Current: 16 mA
■ Alternative function: P15
1
B4
B5
P27
PWM1
Input
Input
Floating
Floating
VDDO ■ GPIO: P27
■ Keyboard scan output (column): KSO19
■ SPI_2: MOSI (master and slave)
■ Optical control output: QOC1
■ Current: 16 mA
35
P28
VDDO ■ GPIO: P28
PWM2
■ Optical control output: QOC2
■ A/D converter input
■ LED1
■ Current: 16 mA
■ Alternative function: P13
–
A5
P29
PWM3
Input
Floating
VDDO ■ GPIO: P29
■ Optical control output: QOC3
■ A/D converter input
■ LED2
■ Current: 16 mA
Document Number: 002-14891 Rev. *C
Page 22 of 42
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