PCA9698方案咨询，只做输出使用

[150973860]

我有个产品想用PCA9698DGG这个芯片扩展IO，只做输出使用，我想请问：

1、由于我MCU引脚有限，只有三根引脚用于扩展，我想接SDA、SCL和RESET，因为只做输出使用，请问OE输出使能引脚可以直接接低电平吗？

2、因为只做输出使用，INT引脚可以不接吗？

3、我扩展IO的目的是模拟多路SPI接口，请问这个芯片的响应速度是否可以满足？（我使用的SPI速度不是很高）

非常感谢！

[TomasVaverka]

Hi Xiaoyong,

1. Yes, when a LOW level is applied to the OE pin, with OEPOL = 0 (default), all the I/Os configured as outputs are enabled and the logic value programmed in their respective OP registers is applied to the pins.

2. Yes, the INT pin can be left open (unconnected) when using port pins as outputs only.

3. I assume you need to take into consideration following timing parameters:

Best regards,

Tomas

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