High current issue resulted from UART in nRF52832

[conrad]

    I am developing my code in a custom nrf52832 breakout board. My code was modified from the example "ble_app_uart".

I find a high current issue with UART. The current is around 58uA as I expected after power startup with RX and TX pins

connected to a USB to TTL dongle. 

But if the Rx and Tx pins are not connected and power up nRF52832, the current goes to 2.24mA. At this moment if I connect

the Rx and Tx pins, the current will go to 58uA.

      

It seems that nRF52832 can`t go into sleep on mode. But I bad disable UART in my code as the following:

#ifndef DEBUG_MODE
/* Disable UART */
// NRF_UART0->ENABLE = 0;
app_uart_close();
nrf_gpio_cfg_default(6);
nrf_gpio_cfg_default(8);
nrf_gpio_cfg_default(5);
nrf_gpio_cfg_default(7);
#endif

In order to go into sleep on mode, my code is as following:

/**@brief Function for placing the application in low power state while waiting for events.
*/
static void power_manage(void)
{
uint32_t err_code = sd_app_evt_wait();
APP_ERROR_CHECK(err_code);
}
/**

The detail of my software and hardware are as following:

1. SDK 12.2.0

2. Softdevice S132 3.0.0

3. IDE: Keil V5.25.2.0

4. nRF52832 chip version: CIAAB0

5. Ble advertising interval: 1000ms

[FormerMember]

Do you see the same if you test the uart example in the peripheral folder ( ..\examples\peripheral )?

[conrad]

Hi Kristin,

    I had not check the result if I use the uart example in the peripheral folder. I will test the example to see if it is the same in

next Monday. Thanks for your suggestion.