high drive on nrf51822 not working

[brinder]

I am using the nrf51822 with a latching circuit as shown controlled by P0.05 pin.

I am using the following code SDK 10.0 S110 softdevice to Power ON the circuit (PowerPin P0.05.

 #define powerPin 5
   NRF_GPIO->PIN_CNF[powerPin] = (GPIO_PIN_CNF_DRIVE_H0D1 << GPIO_PIN_CNF_DRIVE_Pos)
                       |(GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);

		nrf_delay_ms(1000);
		nrf_gpio_pin_clear(powerPin);
		nrf_delay_ms(400);
		nrf_gpio_pin_set(powerPin);
		nrf_delay_ms(1000);
		nrf_gpio_pin_clear(powerPin);
		nrf_delay_ms(400);
		nrf_gpio_pin_set(powerPin);

However, the latching circuit does not come on.

When I use an external wire to connect P0.05 to groud and then to 3.3V the latching circuit powers on.

It appears that despite using H0D1 the pin is not able to provide power / drain

Request some advice

[Jørn]

What is the voltage level of VBAT in your schematic?

[brinder]

3.3V at VBAT

[Turbo J]

The pin mode

GPIO_PIN_CNF_DRIVE_H0D1

is the "open collector" high drive, that means the pin can switch from high current capable zero (0) to high impedance (D == disconnect).

You probably wanted to use

GPIO_PIN_CNF_DRIVE_H0H1

as your pin mode, as this will actually drive the pin when it is set high.