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
–
C4
P36
Input
Floating
VDDO ■ GPIO: P36
■ A/D converter input
■ Quadrature: QDZ0
■ SPI_2: SPI_CLK (master and slave)
■ Auxiliary Clock Output: ACLK0
■ Battery detect pin in default FW
■ External T/R switch control: ~tx_pd
36
36
36
C3
B3
A3
P37
P38
P39
Input
Input
Input
Floating
Floating
Floating
VDDO ■ GPIO: P37
■ A/D converter input
■ Quadrature: QDZ1
■ SPI_2: MISO (slave only)
■ Auxiliary clock output: ACLK1
■ Alternative function: P38, P39
VDDO ■ GPIO: P38
■ A/D converter input
■ SPI_2: MOSI (master and slave)
■ IR_TX
■ XTALO32K (64-BGA only)
■ Alternate functions: P37, P39
VDDO ■ GPIO: P39
■ SPI_2: SPI_CS (slave only)
■ SPI_1: MISO (master only)
■ Infrared control: IR_RX
■ External PA ramp control: PA_Ramp
■ XTALI32K (64-BGA only)
■ 60Hz_main
■ Alternative function: P37, P38
a. During Power-On Reset, all inputs are disabled.
Document Number: 002-14891 Rev. *C
Page 24 of 42
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