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 Circuitry Note1
2	VIN5V	P	-	-	● Power Supply Input (3.6V～5.5V) Note1
3	PA0	IO	-	-	● XIN (Default at Power-on) ● GPIO PA0 ● PWM2
4	VDD11	P	-	-	● LDO-1.1V Output ● 1.1V Core Power Supply Note1
5	GND	P	-	-	Ground
6	PA2	IO	√	IN,T+D	● GPIO PA2 (Default at Power-on) ● IIC_SDA ● UART1_TX ● PWM0 ● PWMP
7	PA3	IO	√	IN,T+D	● GPIO PA3 (Default at Power-on) ● IIC_SCL ● UART1_RX1 ● PWM1 ● PWMN
8	PA4	IO	√	IN,T+U	● GPIO PA4 (Default at Power-on)/PG_EN Note2 ● PWM2
9	PB5	IO	√	IN,T+U	● GPIO PB5 (Default at Power-on) ● UART0_TX ● IIC_SDA ● PWM1 ● PWMP
10	PB6	IO	√	IN,T+U	● GPIO PB6 (Default at Power-on) ● UART0_RX ● IIC_SCL ● PWM2 ● PWMN
11	VCM	O	-	-	VCM Output
12	MICN	I	-	-	Microphone N Input
13	MICP	I	-	-	Microphone P Input
14	MICBIAS	O	-	-	Microphone Bias Output
15	AGND	P	-	-	Analog Ground
16	HPOUT	O	-	-	DAC Output

Note1: A 4.7uF external capacitor is required for this pin
Note2: System enters programming mode when this pin is high during power-on

Symbol Definition¶

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-on

IN Default to Input mode at power-on

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

Multiplexing Functions¶

Table P-2 I/O Multiplexing Functions

Pin Number	Function1	Function2	Function3	Function4	Function5	Function6	Specific Function
PA0	PA0	PWM2	-	-	-	-	XIN
PA2	PA2	-	IIC_SDA	UART1_TX	PWM0	PWMP	-
PA3	PA3	-	IIC_SCL	UART1_RX	PWM1	PWMN	-
PA4	PA4	-	-	-	PWM2	-	PG_EN Note3
PB5	PB5	UART0_TX	IIC_SDA	PWM1	PWMP	-	-
PB6	PB6	UART0_RX	IIC_SCL	PWM2	PWMN	-	-

Note3: The PA4 (PG_EN) pin has an internal pull-up by default. If the system detects this pin is high during power-on and there is a Firmware Update signal on the UART0 interface, it will automatically enter programming mode, allowing the internal Flash to be programmed using the upgrade tool. If no Firmware Update signal is detected on the UART0 interface or if the PA4 pin voltage is low, the system will enter normal operation mode.