CYW20737
Table 8. Pin Descriptions (Cont.)
Pin Number Pin Name
BSC
I/O
Power Domain
Description
15
SDA
I/O, PU VDDM
Data signal for an external I2C device.
Alternative function:
■ SPI_1: MOSI (master only)
■ GPIO0
■ CTS
16
SCL
I/O, PU VDDM
Clock signal for an external I2C device.
Alternative function:
■ SPI_1: SPI_CLK (master only)
■ GPIO1
■ RTS
LDO Regulator Power Supplies
2
3
LDOIN
I
N/A
N/A
Battery input supply for the LDO
LDO output
LDOOUT
O
Table 9. GPIO Pin Descriptionsa
Default Di- After POR
Pin Number
Pin Name
P0
Power Domain
Alternate Functions
rection
State
19
Input
Input
VDDO
■ GPIO: P0
floating
■ PUART_TX (peripheral UART)
■ SPI_2: MOSI (master and slave)
■ ADC_IN29 (A/D converter input)
■ IR_RX/60 Hz_main
■ Not available during TMC=1
■ GPIO: P1
20
P1
Input
Input
floating
VDDO
■ IR_TX
■ PUART_RTS (peripheral UART)
■ SPI_2: MISO (master and slave)
■ ADC_IN28 (A/D converter input)
■ GPIO: P3
21
22
P3
P2
Input
Input
Input
floating
VDDO
VDDO
■ SPI_2: SPI_CLK (master and slave)
■ Quadrature X1
■ PUART_CTS (peripheral UART)
■ GPIO: P2
Input
floating
■ SPI_2: SPI_MOSI (master only)
■ Quadrature X0
■ PUART_RX (peripheral UART)
■ SPI_2: SPI_CS (slave)
Document Number: 002-16365 Rev. *C
Page 18 of 36
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