RE: temperature module NRF51822

kevin chen — Fri, 04 Apr 2014 02:20:58 GMT

hi Ole Morten:

        thank you for your great support.

        i have tested nrf6310\temperature_example. at  30(Celsius)
        
        I checked the data.   NRF_TEMP=0x000002AF;   TEMP=0xFFFFFFAC;  
        what's the NRF_TEMP data type? 10bit 2's complement  or 32bit 2's complement? 
       which position is for sign(+/-)?
        result=10 =  10* 0.25 celsius.right?
       how to work out the result of die temperature?

int main(void) { int32_t volatile temp; int32_t temp_valve;

nrf_temp_init();
nrf_gpio_range_cfg_output(8, 15);

while(true)
{       
    NRF_TEMP->TASKS_START = 1;
    while ((NRF_TEMP->EVENTS_DATARDY & TEMP_INTENSET_DATARDY_Msk) != (TEMP_INTENSET_DATARDY_Set << TEMP_INTENSET_DATARDY_Pos))
    {
    }
    NRF_TEMP->EVENTS_DATARDY = 0;
    temp = (nrf_temp_read()/4);
    NRF_TEMP->TASKS_STOP = 1; /* Stop the temperature measurement */

    nrf_gpio_port_write(NRF_GPIO_PORT_SELECT_PORT1, (uint8_t)(temp));

    nrf_delay_ms(500);
}

}

kind regards

kevin chen

from china

RE: temperature module NRF51822

Ole Morten — Mon, 31 Mar 2014 10:57:35 GMT

The temperature sensor measures the die temperature of the chip, which may very well be different (higher) than the temperature of the surrounding air. You can refer to the nRF51 Reference Manual for the register interfaces, the nRF51822 Product Specification for electrical specifications.

It shouldn't need any calibration or similar, and is completely internal to the chip.