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Pin Diagram and Functional Description

Pin Diagram

Figure P-1 Pin Assignment and Definition

Pin Description

Table P-1 Pin Description

Pin No.	Pin Name	Type	5V Tolerant	Default State	Pin Function
1	AVDD	P	-	-	● Internal LDO-3.3V Output ● 3.3V Power Supply for Analog Circuits Note1
2	VIN5V	P	-	-	● Power Supply Input (3.6V - 5.5V) Note1
3	VDD11	P	-	-	● LDO-1.1V Output ● 1.1V Core Power Supply Note1
4	GND1	P	-	-	Ground
5	VDDRF	P	-	-	● RF Power Input
6	XOUT	IO	-	-	● Crystal Oscillator Output
7	XIN	IO	-	-	● Crystal Oscillator Input
8	GND2	P	-	-	Ground
9	RF	IO	-	-	● RF Antenna
10	PB5	IO	√	IN,T+U	● GPIO PB5 (Default) ● UART0_TX ● I2C_SDA ● PWM1 ● PWMP
11	PB6	IO	√	IN,T+U	● GPIO PB6 (Default) ● UART0_RX ● I2C_SCL ● PWM2 ● PWMN
12	PC4	IO	-	IN,T+U	● Reserved (Default: GND) ● PC4 ● SCL ● PWM0
13	HPOUT	O	-	-	DAC Output Note2
14	MICP	I	-	-	Microphone Positive Input
15	MICBIAS	O	-	-	Microphone Bias Output
16	VCM	O	-	-	VCM Output

Note1: Requires external 4.7μF capacitor
Note2: System enters programming mode when this pin is high during power-up

Symbol Definitions

I - Input

O - Output

IO - Bidirectional

P - Power or Ground

T+D - Tri-state with Pull-down

T+U - Tri-state with Pull-up

OUT - Default to output mode at power-up

IN - Default to input mode at power-up

All IOs support configurable drive strength and pull-up/down resistors.

Multiplexed Functions

Table P-2 IO Multiplexing Functions

Pin Number	Function1	Function2	Function3	Function4	Function5	Function6	Specific Function
PB5	PB5	UART0_TX	I2C_SDA	PWM1	PWMP	-	-
PB6	PB6	UART0_RX	I2C_SCL	PWM2	PWMN	-	-
PC4	-	PC4	SCL	PWM0	-	-	-