Part Number:TCA9509Other Parts Discussed in Thread:TCA9539
您好!
我有如下疑惑,请帮忙解疑答惑:
1、当TCA9539芯片上的GPIO都作为电源芯片EN的控制脚,有时序要求时候,比如P00~P07 、P10~P17每个管脚上电时序精度是多少?
2、当TCA9539芯片上的GPIO都作为PWM输出,且要求P00~P07 、P10~P17每个管脚有时序要求,此芯片是否能实现?
Links:
TCA9539的规格书没有给出该精度值,因为每个GPIO引脚的上电时序精度会受到I2C总线时序和具体应用电路的影响。
TCA9539仅为通用I/O扩展器,如果对PWM的时序有要求,建议考虑PWM芯片。
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您好!
那对于用GPIO扩展出有严格时序要求的PWM信号的扩展芯片有推荐吗?或者是译码器芯片也能实现吧,有推荐的型号吗?
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Links:
TI是有PWM控制器的,请查看下面的链接
脉宽调制 | TI.com.cn
或者选择内置PWM控制的MCU了。
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您好!
我们这边已经有一个SOC的主控了,只是主控上管脚不够用,需要扩展出16个,其实也不是输出PWM,而是一个20Hz的方波,但是对于这16个方波的输出时间之间的时序要求很精确,精确度至少在10us到100us之间。译码器或编码器芯片可以是实现吗?
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Links:
可以尝试SoC与I2C或SPI接口的GPIO扩展芯片进行配置,结合外部精确时钟源,通过主控精确控制扩展器的输出时序