NRF24LE1 power consumption of input buffer on and off

[junma]

Hi all,

I want to know the effect on power consumption of pins input buffer on and off, does there are big differences between them?

Another question is, since there are some unused pins in the SOC, so what shall do to them to save power consumption? configure them to be output or input, if input, then input buffer on or off?

Thanks in advance for any of your comments or advices, sincerely!

Best regards!

[Hung Bui]

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;

[Hung Bui]

@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.