LPC844 低功耗

[kentsun]

在调试深度睡眠相关功能，当芯片进入深度休眠后，发现I2C部分的上拉电阻有1.4mA左右的耗电，如何去除这上面的功耗？

[jeremyzhou]

Hi kent sun

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
I'd like to suggest you use the PIO0_10 and PIO0_11as the I2C_SCL, I2C_SDA, respectively.
The PIO0_10 and PIO0_11 can be programmed to support a true open-drain, in other word, removing the external resistors are available.
Please give a try.
Have a great day,
TIC

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[kentsun]

去掉上拉电阻后，IIC不能正常工作。 

kent

sun

136-1184-5798

 发件人： jeremyzhou发送时间： 2019-03-05 10:16收件人： kent sun主题： Re: - Re: LPC844   低功耗

NXP Community

Re: LPC844   低功耗

reply from jeremyzhou in LPC Microcontrollers - View the full discussion

Hi kent sunThank you for your interest in NXP Semiconductor products and for the opportunity to serve you.

I'd like to suggest you use the PIO0_10 and PIO0_11as the I2C_SCL, I2C_SDA, respectively.

The PIO0_10 and PIO0_11 can be programmed to support a true open-drain, in other word, removing the external resistors are available.

Please give a try.

Have a great day,

TIC 

[jeremyzhou]

Hi kent sun,

感谢回复！
对的，确实需要上拉电阻，我原来的回复有出错，抱歉。
在LPC844进入低功耗模式后，在上拉电阻上的电量损耗，无法被完全去除，因为这个“回路”始终存在，但可以尝试适当增大上拉电阻来降低损耗。
Have a great day,
TIC

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