NRF24LE1 power consumption of input buffer on and off

RE: NRF24LE1 power consumption of input buffer on and off

Hung Bui — Fri, 03 Jul 2015 12:08:30 GMT

@junma: No there is no buffer with output. Just only 2 choices standard drive and high drive (5mA).

When configure at output I think the leakage current could be higher, but very small (nano amp) , and also configure as input, high impedance also safe, just in case the pin is physically connected to ground or VDD.

RE: NRF24LE1 power consumption of input buffer on and off

junma — Fri, 03 Jul 2015 09:01:43 GMT

Hi Hung Bui, thanks for your reply! Another question that need your advice is that, if I configure one pin to be output, shall I do works with output buffer? since I didn't see output buffer in spec.

Finally, does output pin consumes more energy than input pin(without internal resistor connected)? Thanks!

RE: NRF24LE1 power consumption of input buffer on and off

Hung Bui — Thu, 02 Jul 2015 12:57:57 GMT

Hi Junma, I don't have a number on how much leakage current are different between buffer on and off. But I don't think it could be a big different.

To be able to disable a pin and have least power consumption, you should configure the pin as digital input with buffer off. Here how I disable all pin on P1:

    P1DIR = 0xFF;
	P1CON = 0x70;
	P1CON = 0x71;
	P1CON = 0x72;
	P1CON = 0x73;
	P1CON = 0x74;
	P1CON = 0x75;
	P1CON = 0x76;
 	P1CON = 0x77;