Number of nRF51822 high drive pins

RE: Number of nRF51822 high drive pins

MARTIN FR — Mon, 07 Dec 2015 11:19:14 GMT

Can you please verify my configuration of the GPIO high drive Mode does both of the pin 6 and 7 will be drive 5mA or do i ahve modify something please give me some suggestion because am not hearing loud sound in my buzzer

static void PWMinit(void)

{

nrf_gpio_range_cfg_output(6,7);

NRF_GPIO->PIN_CNF[6] = (GPIO_PIN_CNF_DRIVE_H0D1 << GPIO_PIN_CNF_DRIVE_Pos);

NRF_GPIO->PIN_CNF[7] = (GPIO_PIN_CNF_DRIVE_H0D1 << GPIO_PIN_CNF_DRIVE_Pos);

ret_code_t err_code;

app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_2CH(159UL,6,7);//6.3KHz

pwm1_cfg.pin_polarity[1] = APP_PWM_POLARITY_ACTIVE_LOW;

/* Initialize and enable PWM. */

err_code = app_pwm_init(&PWM1,&pwm1_cfg,pwm_ready_callback);

APP_ERROR_CHECK(err_code);

app_pwm_enable(&PWM1);

for(int i = 0; i < 3; i++)

{

app_pwm_channel_duty_set(&PWM1, 0, 50);

nrf_delay_ms(1000);
app_pwm_channel_duty_set(&PWM1, 0, 0);

nrf_delay_ms(2000);
  app_pwm_channel_duty_set(&PWM1, 0, 70);

}

app_pwm_disable(&PWM1);

}

RE: Number of nRF51822 high drive pins

Stefan Birnir Sverrisson — Mon, 07 Dec 2015 10:28:50 GMT

ok, thanks for your clarificaiton. I was perhaps misunderstanding you a little bit. I think that should be fine to connect two gpio pins to a single buzzer to drive 10mA. This thread is actually describing better the GPIO drive/sink properties

RE: Number of nRF51822 high drive pins

MARTIN FR — Mon, 07 Dec 2015 09:42:17 GMT

yes am going to use only one buzzer by connecting two gpio pins directly to the buzzer positive terminal so each gpio pin can deliver maximum of 5mA so totally two gpio pin can deliver only 10mA to the buzzer so am not exceeding more than 10mA my idea is correct or still am voilating the maximum current limit?

RE: Number of nRF51822 high drive pins

Stefan Birnir Sverrisson — Mon, 07 Dec 2015 09:06:51 GMT

That is not allowed, as it exceeds the total 15mA GPIO current limit. If you however only use one buzzer at one time, it will work

RE: Number of nRF51822 high drive pins

MARTIN FR — Mon, 07 Dec 2015 09:01:17 GMT

can i connect set two gpio in (10mA) high drive mode and connect to buzzer does it will work fine or am excedding the maximum current limit?

RE: Number of nRF51822 high drive pins

Stefan Birnir Sverrisson — Wed, 11 Mar 2015 08:54:07 GMT

It is max 5mA on a single pin, which is the high drive option.

RE: Number of nRF51822 high drive pins

Tim — Wed, 11 Mar 2015 08:17:40 GMT

And 1x15mA? Or is it max 5mA on a single pin?

RE: Number of nRF51822 high drive pins

Stefan Birnir Sverrisson — Tue, 10 Mar 2015 20:49:00 GMT

To further clarify Annims answer, you can drive 15mA current with GPIOs at a given time, in any combination you like, 3x5mA, 15x1mA, (2x5mA + 5x1mA), doesn't matter

RE: Number of nRF51822 high drive pins

Annim — Mon, 09 Mar 2015 13:27:46 GMT

You can drive more than 5 pins, but, at a time , only 3 pins can be at 5mA drive.