Hello,
I would like to power the NHS3152 chip only through the NFC field and perform a measurement with it. Unfortunately the measurement seems to consume too much current, so I inserted a capacitor (100µF) between PIO0_7 (high-drive-pin) and ground. Now I want to charge this capacitor through the field first and then use the stored energy of the capacitor plus that of the field to perform a measurement. I have created the following program for this purpose:
int main(void)
{
// TODO: Load Capacitor
Board_Init();
Chip_IOCON_Init(NSS_IOCON);
Chip_GPIO_Init(NSS_GPIO);
Chip_Clock_Clkout_SetClockSource(CLOCK_CLKOUTSOURCE_SYSTEM);
Chip_IOCON_SetPinConfig(NSS_IOCON, IOCON_PIO0_7 , IOCON_FUNC_0 | IOCON_RMODE_INACT | IOCON_LPF_DISABLE | IOCON_CDRIVE_FIXEDVOLTAGE | IOCON_DDRIVE_ULTRAHIGH);
Chip_GPIO_SetPinDIROutput(NSS_GPIO, 0, 7);
Chip_GPIO_SetPinOutHigh(NSS_GPIO, 0, 7);
Chip_Clock_System_BusyWait_ms(300);
GetData();
Chip_NFC_Init(NSS_NFC);
NDEFT2T_Init();
sendData();
return 0;
}
However, this does not work yet. I want to read a NDEFT message with a smartphone. Furthermore I noticed while measuring the voltage over the capacitor that it rises to approx. 1.8 Volt. However, not every device seems to have enough power to reach this voltage. My question is whether I have the pins correctly driven or whether I still have other configurations to make.
Many thanks in advance.
Yours sincerely,
Tom
I am sorry, but I don't understand why "addional" power is needed, from my understanding, after a smartphone is close to the device, and before the smartphone gets what it needs, the RF field should be always available, and so the device keeps power on in that case, if the device still could not work, you might have to check the antenna design.
Have a great day,
Kan
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