Low Power Mode in ArduCAM-mini-2MP

Other Hardware 3rd Party Boards
1

Hi. I try to reduce the power consumption of Arducam mini 2MP (OV2640). I can take it to Standby mode with the following code. However, it still consumes about 40 mA in standby mode which is much more than what it should be (about 1 mA according to the datasheet)!

    myCAM.set_bit(ARDUCHIP_GPIO,GPIO_PWDN_MASK);

Does anybody know what is wrong with this simple task?

Many thanks in advance

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