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
–
E4
E7
D6
P30
Input
Floating
VDDO ■ GPIO: P30
■ A/D converter input
■ Pairing button pin in default FW
■ Peripheral UART: puart_rts
–
P31
P32
Input
Input
Floating
Floating
VDDO ■ GPIO: P31
■ A/D converter input
■ EEPROM WP pin in default FW
■ Peripheral UART: puart_tx
31
VDDO ■ GPIO: P32
■ A/D converter input
■ Quadrature: QDX0
■ SPI_2: SPI_CS (slave only)
■ SPI_1: MISO (master only)
■ Auxiliary clock output: ACLK0
■ Peripheral UART: puart_tx
30
D8
P33
Input
Floating
VDDO ■ GPIO: P33
■ A/D converter input
■ Quadrature: QDX1
■ SPI_2: MOSI (slave only)
■ Auxiliary clock output: ACLK1
■ Peripheral UART: puart_rx
–
–
B6
D5
P34
P35
Input
Input
Floating
Floating
VDDO ■ GPIO: P34
■ A/D converter input
■ Quadrature: QDY0
■ Peripheral UART: puart_rx
■ External T/R switch control: tx_pd
VDDO ■ GPIO: P35
■ A/D converter input
■ Quadrature: QDY1
■ Peripheral UART: puart_cts
Document Number: 002-14891 Rev. *C
Page 23 of 42
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