Sleep mode current increases when i2c wakeup source used

[VasuVirpariya]

I used the SDK's example (power_mode_switch_lpc) for exercising power-down mode. I added support for i2c wakeup in power-down mode. The issue that we are facing is as per below.

1) Entering power-down mode from the UART menu.

2) Power down mode current = 14 uA.

3) Wake up from the I2C.

4) Entering power-down mode from the UART menu.

5) Power down mode current = 67 uA.

 I have attached the project below. What could be going wrong in second time?

[VasuVirpariya]

It is LPC804. I am using the LPCxpresso804 kit. 

What I am wondering is why first time it is consuming 14uA current and the second time onward it is taking 67uA. The attached firmware can be run on the LPCxpresso804 kit.

[xiangjun_rong]

Hi,

Because you use I2C as slave to wake-up the LPC, I suppose that you activate  SRAM block, as you know that each SRAM block requires a lot power.

Pls check the SRAM block power up or down in PDRUNCFG register for your different configuration

BTW, can you tell us the part number of LPC?

BR

XiangJun Rong