nrf24le1 power consumption

RE: nrf24le1 power consumption

Vitaly — Tue, 24 Jan 2017 05:42:28 GMT

Hi! Yes, with code above device is working more than 1,5 years with 2xAA batteries. Thats enough for me.

RE: nrf24le1 power consumption

mr_creosote — Tue, 27 Dec 2016 19:25:27 GMT

hi Vitaly, did you ever get the power usage down?

RE: nrf24le1 power consumption

Vitaly — Sat, 21 Feb 2015 11:27:35 GMT

Hi Håkon, Sorry for delaying with answer. I just tried this code from example:

#include <Nordic\reg24le1.h>
#include <stdint.h>
#include "hal_clk.h"
#include "hal_rtc.h"

uint8_t xdata toggle;

void mcu_init(void)
{
// XOSC32K input
P0DIR = 0x00;
P1DIR = 0x00;
P2DIR = 0x00;
P3DIR = 0x00;

P0 = 0x00;
P1 = 0x00;
P2 = 0x00;
P3 = 0x00;

// Open latch
OPMCON = 0x00;
}

void wakeup_tick() interrupt INTERRUPT_TICK
{
// Toggle output on wakeup
P02 = toggle;
toggle = !toggle;
}

void main(void)
{
mcu_init();

// If wakeup from tick, turn on LED
if(PWRDWN & 0x40)
{
IEN1 = 0x20;
EA = 1;
// Go to standby mode and wait for RTC interrupt
PWRDWN = 0x07;
// Clear power down
PWRDWN = 0x00;
}
else
{
// Init RTC timer
/*
hal_rtc_start(false);
hal_clklf_set_source(HAL_CLKLF_XOSC32K);
hal_rtc_set_compare_mode(HAL_RTC_COMPARE_MODE_0);
hal_rtc_set_compare_value(0x7FFF);
hal_rtc_start(true);
*/
}

// Lock latch
OPMCON |= 0x02;

// Memory retention mode timer on, system reset on wakeup
PWRDWN = 0x03;
while(1);
}

Result is the same: 31 uA...

RE: nrf24le1 power consumption

Håkon Alseth — Wed, 18 Feb 2015 10:20:34 GMT

That is correct. You can run both the 32k and 16M on the internal RC oscillators. Note that the example I previously linked to uses the external 32 kHz source. You can just remove the RTC functions and go straight to sleep instead.

RE: nrf24le1 power consumption

Vitaly — Wed, 18 Feb 2015 10:18:51 GMT

Ok, I'll try it today evening. Am I correct understand, that i don't need to connect any external cryslals? Neither 16M, nor 32K? In all of example codes I should use only internal crystals, right?

RE: nrf24le1 power consumption

Håkon Alseth — Wed, 18 Feb 2015 10:01:14 GMT

Could you try the example located in our FAQ? www.nordicsemi.com/.../How-to-setup-memory-retention-timers-on-on-the-nRF24LE1

I do not see any flaws in your example, but you can try this to see if it shows the same current.

RE: nrf24le1 power consumption

Vitaly — Wed, 18 Feb 2015 09:25:58 GMT

I measured by two different multimeters. One of them is MASTECH MAS830L (http://goo.gl/tkpmPX). They both showed similar results. Also I've included a resistor 1 kOm consistently in the power circuit. The voltage drop on it was around 30 mV. So the current is 0.03V/1000 Om = 30 uA

RE: nrf24le1 power consumption

Håkon Alseth — Wed, 18 Feb 2015 08:08:37 GMT

What type of multi-meter are you using to measure the current? Have you tried several multimeters, and do they all state the same value? Most multimeters are inaccurate in the low micro-amp range.

RE: nrf24le1 power consumption

Vitaly — Tue, 17 Feb 2015 18:51:26 GMT

I just tried it in deep sleep mode. Power supply voltage is 3,19V (new batteries AA). With "OPMCON |= 0x02;" current is 31 uA. Without it current is 29 uA. So, my test code is:

#include <Nordic\reg24le1.h"

void mcu_init(void)
{
OPMCON = 0x00;
P0 = 0x00;
P1 = 0x00;
P2 = 0x00;
P3 = 0x00;

P0DIR = 0x00;
P1DIR = 0x00;
P2DIR = 0x00;
P3DIR = 0x00;

}

void main(void)
{
	
	int i;
mcu_init();

  for (i = 0; i < 8; i ++)
  {
    P0CON = 0x70 | i;
    P1CON = 0x70 | i;
    P2CON = 0x70 | i;
    P3CON = 0x70 | i;
  }
OPMCON |= 0x02;
PWRDWN = 0x01;

while(1);
}

I tried it with two types of boards: with this one: i62.tinypic.com/727i9g.jpg and with this one: i59.tinypic.com/6p6pua.jpg

I use uVision v9.51

RE: nrf24le1 power consumption

Håkon Alseth — Tue, 17 Feb 2015 11:22:42 GMT

Sorry, had to check if you had anything else connected to the nRF. Could you try setting "OPMCON |= 0x02;" prior to going into memret? Also remember to "unlock" this in your init by setting it to "OPMCON = 0x00;" and see if this has any effect?

Cheers, Håkon

RE: nrf24le1 power consumption

Vitaly — Tue, 17 Feb 2015 11:10:48 GMT

Hi, Yes of course, I'm trying to achieve 1-2 uA without any external peripherals. Only power supply (2xAA batteries) are connected. I checked the current by two different multimeters. One more fact: during two weeks voltage on two AA batteries dropped from 3,14V to 3,12V.

RE: nrf24le1 power consumption

Håkon Alseth — Fri, 13 Feb 2015 13:11:17 GMT

Hi,

Is the external sensors pin DQ pulled high using an external pull resistor? I have not used this specific sensor before, but it is set to a sleep state when setting the LE1 to memory retention? Have you tried removing this sensor from the design and seeing the same current consumption?

RE: nrf24le1 power consumption

Vitaly — Mon, 09 Feb 2015 15:10:59 GMT

Hi Håkon! Thank you for your responce! I have tried your code, but power consumption still 30uA... Now my test code is:

void main()
{
__xdata __at(0x0100) unsigned int count; //counter for loop
uint8_t i;

pwr_clk_mgmt_cclk_configure(PWR_CLK_MGMT_CCLK_CONFIG_OPTION_START_ONLY_XOSC16M | PWR_CLK_MGMT_CCLK_CONFIG_OPTION_XOSC16M_IN_REGISTER_RET_OFF);

pwr_clk_mgmt_clklf_configure(PWR_CLK_MGMT_CLKLF_CONFIG_OPTION_CLK_SRC_RCOSC32K);
pwr_clk_mgmt_wait_until_clklf_is_ready();
gpio_pin_configure(GPIO_PIN_ID_P0_0,GPIO_PIN_CONFIG_OPTION_DIR_OUTPUT);


rtc2_configure(RTC2_CONFIG_OPTION_COMPARE_MODE_0_RESET_AT_IRQ ,65535); //65535=2 sec, 32767=1 sec
rtc2_run();


pwr_clk_mgmt_wakeup_configure(PWR_CLK_MGMT_WAKEUP_CONFIG_OPTION_WAKEUP_ON_RTC2_TICK_ALWAYS,0);

sti();
   //main program loop

   while(1)
   {


count++;
if (count>2){

gpio_pin_val_set(GPIO_PIN_ID_P0_0); 
    delay_ms(500); 
gpio_pin_val_clear(GPIO_PIN_ID_P0_0); 



  count=0;

   }    
//   adc_power_down();   
//   rf_power_down();

P0DIR=0xFF;
P1DIR=0xFF;
P2DIR=0xFF;
P3DIR=0xFF;

for (i = 0; i < 8; i ++)
  {
    P0CON = 0x70 | i;
    P1CON = 0x70 | i;
    P2CON = 0x70 | i;
    P3CON = 0x70 | i;
  }

   pwr_clk_mgmt_enter_pwr_mode_memory_ret_tmr_on(); // 1uA

}

}

RE: nrf24le1 power consumption

Håkon Alseth — Mon, 09 Feb 2015 13:51:48 GMT

Hi,

You'll need to disconnect all the pin buffers internally in the nRF24LE1 in order to make sure that GPIOs are not floating.

This can be done similar to this:

void disconnectGPIO()
{
  uint8_t i;
  for (i = 0; i < 8; i ++)
  {
    P0CON = 0x70 | i;
    P1CON = 0x70 | i;
    P2CON = 0x70 | i;
    P3CON = 0x70 | i;
  }
}

Note that this will disconnect all GPIOs, you'll need to mask out the one's that are in use.

Cheers, Håkon