[FAQ0701483]AW21024X_AW21036X如何实现open或short检测？

Sensor&呼吸灯 2025-11-18 阅读量: 93 点赞量: 61

A：AW21024X_AW21036X的open或short检测，需在灯常亮状态下执行。核心操作逻辑是先点亮所有LED灯，再通过寄存器配置启动检测并读取结果，具体操作流程及参数配置如下：

1、点亮所有LED，完成以下寄存器配置步骤：

1）使能芯片：0x00寄存器的CHIPEN位设置为1；

GCR: Global Control Register(Address 00H)

Bit

Symbol

R/W

Description

Default

CHIPEN

Chip enable

0: Disable (default)

1: Enable

2）将所有LED灯的亮度BRx和颜色COLx都设置为0xff

BR: BR Register(Address 01H~24H)
Bit	Symbol	R/W	Description		Default
7:0	BR	RW	Individual 8bit BR parameter for LED1~36. After configuring the BR registers, should write 0x00 to register UPDATE to update the data.		0x00
COL0~COL35: COL Register(Address 4AH~6DH)
Bit	Symbol	R/W	Description	Default
7:0	COL	RW	Individual 8bit COL parameter for LED1~36.	0x00

3）通过给0x49寄存器写0x00让亮度BRx寄存器的值生效

UPDATE: Update Register(Address 49H)
Bit	Symbol	R/W	Description	Default
7:0	UPDATE	W	Write 0x00 to update BR register.	0x00

4）将0x78寄存器的bit7:bit5设置为b111，即PWM占空比设置成100%

SSCR: Spread Spectrum Control Register (Address 78H)
Bit	Symbol	R/W	Description	Default
7	PWMDIS2	RW	0: PWM duty of LED 25~36 determined by BR24~BR35 1: PWM duty of LED 25~36 fixed as 100%	0
6	PWMDIS1	RW	0: PWM duty of LED 13~24 determined by BR12~BR23 1: PWM duty of LED 13~24 fixed as 100%	0
5	PWMDIS0	RW	0: PWM duty of LED 1~12 determined by BR0~BR11 1: PWM duty of LED 1~12 fixed as 100%	0

5）根据当前项目使用的LED参数和硬件电阻大小，设置全局电流（0x6E寄存器）；推荐设置为0x0f

GCCR: Global Control Register(Address 6EH)
Symbol	R/W	Description	Default
GCC	RW	Global current control.	0x00

注意：

（K=200, VREXT = 0.4V, n=1, 2, 3, …, 36）

2、打开open或short检测，同步设置open和short阈值（0x71寄存器）；

OSDCR: Open Short Detect Control Register(Address 71H)
Bit	Symbol	R/W	Description	Default
3	OTH	RW	Open threshold 0: 0.1V 1: 0.2V	0
2	STH	RW	Short threshold 0: VDD-1V 1: VDD-0.5V	0
1:0	OSDE	RW	Open short detect enable b0x: Detect disable b10: Short detect enable b11: Open detect enable	00

3、延时50ms；

4、读0x72~0x76寄存器查看检测结果，其对应的位置如下：

5、 OSST0~3: Open/Short Status Register (Address 72H~75H)

Bit

Symbol

R/W

Description

Default

7:0

OSST

Open/short status of LED1~LED32

0: No open/short event detected

1: Open/short event detected

0x00

OSST4: Open/Short Status Register (Address 76H)
Bit	Symbol	R/W	Description	Default
7:4	RESERVED	R	Reserved	0000
3:0	OSST	R	Open/short status of LED33~LED36 0: No open/short detected 1: Open/short detected	0000

6、用AW21036QNR举例如下：

1. //1.点亮所有灯

2. // Chip enable

3. aw_i2c_writebyte(I2C_ADDR, 0x00, 0x01);

4. // Set BRx

5. for(int i = 0;i < NUMS; i++){ //NUMS是LED的个数

6. aw_i2c_writebyte(I2C_ADDR, 0x01 + i, 0xFF);

7. }

8. // Set SLx

9. for(int i = 0;i < NUMS; i++){ //NUMS是LED的个数

10. aw_i2c_writebyte(I2C_ADDR, 0x4A + i, 0xFF);

11. }

12. // update BRx

13. aw_i2c_writebyte(I2C_ADDR, 0x49, 0x00);

14. // Set pwm duty

15. aw_i2c_writebyte(I2C_ADDR, 0x78, 0xE0);

16. // Set global current

17. aw_i2c_writebyte(I2C_ADDR, 0x6E, 0x0f); //需要根据项目进行计算设置

18.

19. //2.开始short检测

20. aw_i2c_writebyte(I2C_ADDR, 0x71, AW210XX_STH << 2 | AW210XX_BIT_SHORT_EN); // AW210XX_STH是短路的阈值,0=VDD-1V,1=VDD-0.5V;AW210XX_BIT_SHORT_EN = 0x02是short检测

21. soft_delay(50); //延时50ms

22. for(int i = 0x72;i < 0x76; i++){

23. aw_i2c_readbyte(I2C_ADDR, i, short_result); //short_result值就是咱们short检测结果，按照手册描述查找对应位置

24. }

25. //3.开始open检测

26. aw_i2c_writebyte(I2C_ADDR, 0x71, AW210XX_OTH << 3 | AW210XX_BIT_OPEN_EN); // AW210XX_OTH是open的阈值,0=0.1V,1=0.2V; AW210XX_BIT_SHORT_EN = 0x03是short检测

27. soft_delay(50); //延时50ms

28. for(int i = 0x72;i < 0x76; i++){

29. aw_i2c_readbyte(I2C_ADDR, i, open_result); //open_result值就是咱们open检测结果，按照手册描述查找对应位置

30. }

31. //4.软件复位并按照项目需求进行初始化