CYW20737
Table 9. GPIO Pin Descriptionsa (Cont.)
Default Di- After POR
Pin Number
Pin Name
P4
Power Domain
Alternate Functions
rection
State
23
Input
Input
floating
VDDO
■ GPIO: P4
■ IR_TX
■ SPI_2: MOSI (master and slave)
■ Quadrature Y0
■ PUART_RX (peripheral UART)
■ GPIO: P8
24
P8
Input
Input
Input
floating
VDDO
VDDO
■ ~TX_PD (external T/R switch control)
■ ADC_IN27 (A/D converter input)
■ GPIO: P33
P33
Input
floating
■ ACLK1 (auxiliary clock output)
■ SPI_2: MOSI (slave)
■ ADC_IN6 (A/D converter input)
■ QDX1 (quadrature X1)
■ PUART_RX (peripheral UART)
■ GPIO: P9
P9
■ TX_PD
■ ADC_IN26
P10
P11
P27
■ GPIO: P10
■ PA_RAMP (power amplifier ramp)
■ ADC_IN25 (A/D converter input)
■ GPIO: P11
1
Input
Input
Input
floating
VDDO
VDDO
■ ADC_IN24 (A/D converter input)
■ XTALI32K
Input
floating
■ GPIO: P27
■ QOC1 (quadrature output control)
■ SPI_2: MOSI (master and slave)
■ PWM1
■ Current: 16 mA
32
P12
P26
Input
Input
Input
floating
VDDO
VDDO
■ GPIO: P12
■ ADC_IN23 (A/D converter input)
■ XTALO32K
Input
■ GPIO: P26
floating
■ QOC0 (quadrature output control)
■ SPI_2: SPI_CS (slave)
■ SPI_1: MISO (master)
■ PWM0
■ Current: 16 mA
Document Number: 002-16365 Rev. *C
Page 19 of 36
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