hi professor，
I'm using nrf5340 to design project,now I wan to reduce power consumption to uA level.According to https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/optimizing-power-on-nrf53-designs?CommentId=ae95c50b-10df-43ad-938f-ac5b9f33677a, I set the CPU power consumption to the lowest using system_off, and measured the power consumption with ppk 2, which still showed 1.25ma.I think the power consumption of nrf5340 can reach the lowest uA level. Please give me some suggestions to further reduce power consumption.
My product design diagram is shown in the following figure,All devices except for the CPU have been powered off at the low power status:
Now i will show i have done something to reduce power:
1、make app core to enter system off mode by system_off().
2、make unused peripheral to disable status by overlay file.
/* overlay file */
#include <dt-bindings/regulator/npm1300.h>
#include <zephyr/dt-bindings/input/input-event-codes.h>
my_spi: &spi4 {
status = "okay";
compatible = "nordic,nrf-spim";
pinctrl-0 = <&spi4_default_alt>;
pinctrl-1 = <&spi4_sleep_alt>;
pinctrl-names = "default", "sleep";
};
&pinctrl {
spi4_default_alt: spi4_default_alt {
group1 {
psels = <NRF_PSEL(SPIM_SCK, 0, 8)>,
<NRF_PSEL(SPIM_MOSI, 0, 9)>,
<NRF_PSEL(SPIM_MISO, 0, 10)>;
};
};
spi4_sleep_alt: spi4_sleep_alt {
group1 {
psels = <NRF_PSEL(SPIM_SCK, 0, 8)>,
<NRF_PSEL(SPIM_MOSI, 0, 9)>,
<NRF_PSEL(SPIM_MISO, 0, 10)>;
low-power-enable;
};
};
};
arduino_spi: &spi4 {
cs-gpios = <&gpio1 5 GPIO_ACTIVE_LOW>; /* D10 */
};
&button0 {
/delete-property/ gpios;
};
&button2 {
gpios = <&gpio0 25 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
};
&button3 {
gpios = <&gpio0 27 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
};
&button0 {
gpios = <&gpio0 23 0>;
};
&uart0_default {
group1 {
psels = <NRF_PSEL(UART_TX, 1, 12)>;
};
group2 {
psels = <NRF_PSEL(UART_RX, 0, 31)>;
};
};
&uart0 {
current-speed = <9600>;
};
&uart0_sleep {
group1 {
psels = <NRF_PSEL(UART_TX, 1, 12)>;
};
group2 {
psels = <NRF_PSEL(UART_RX, 0, 31)>;
};
};
&nfct {
status = "disabled";
};
&usbd {
status = "disabled";
};
arduino_serial: &uart1 {
status = "disabled";
};
&qspi {
status = "disabled";
};
&led3 {
gpios = <&gpio0 16 (GPIO_ACTIVE_LOW)>;
};
&gpio_fwd {
status = "disabled";
uart {
gpios = <&gpio0 24 0>;
};
};
&i2c1_default {
group1 {
psels = <NRF_PSEL(TWIM_SCL, 1, 13)>, <NRF_PSEL(TWIM_SDA, 1, 14)>;
bias-pull-up;
};
};
&i2c1_sleep {
group1 {
psels = <NRF_PSEL(TWIM_SDA, 1, 14)>, <NRF_PSEL(TWIM_SCL, 1, 13)>;
bias-pull-up;
};
};
&pwm0_default {
group1 {
psels = <NRF_PSEL(PWM_OUT0, 0, 30)>;
low-power-enable;
};
};
&pwm0_sleep {
group1 {
psels = <NRF_PSEL(PWM_OUT0, 0, 30)>;
low-power-enable;
};
};
&arduino_i2c {
npm1300_ek_pmic: pmic@6b {
compatible = "nordic,npm1300";
reg = <0x6b>;
npm1300_ek_gpio: gpio-controller {
compatible = "nordic,npm1300-gpio";
gpio-controller;
#gpio-cells = <2>;
ngpios = <5>;
};
npm1300_ek_regulators: regulators {
compatible = "nordic,npm1300-regulator";
/* limits are set to min/max allowed values */
npm1300_ek_buck1: BUCK1 {
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <3300000>;
/delete-property/ regulator-init-microvolt;
};
npm1300_ek_buck2: BUCK2 {
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <3300000>;
regulator-init-microvolt = <1800000>;
regulator-always-on;
regulator-boot-on;
/delete-property/ retention-microvolt;
/delete-property/ enable-gpios;
/delete-property/ retention-gpios;
/delete-property/ pwm-gpios;
};
npm1300_ek_ldo1: LDO1 {
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <3300000>;
regulator-init-microvolt = <1800000>;
regulator-initial-mode = <NPM1300_LDSW_MODE_LDO>;
/delete-property/regulator-always-on;
regulator-boot-on;
/delete-property/ enable-gpios;
};
npm1300_ek_ldo2: LDO2 {
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <3300000>;
regulator-init-microvolt = <3300000>;
regulator-initial-mode = <NPM1300_LDSW_MODE_LDO>;
regulator-always-on;
regulator-boot-on;
/delete-property/enable-gpios;
};
};
npm1300_ek_charger: charger {
compatible = "nordic,npm1300-charger";
term-microvolt = <4200000>;
term-warm-microvolt = <4000000>;
current-microamp = <400000>;
dischg-limit-microamp = <1000000>;
vbus-limit-microamp = <500000>;
thermistor-ohms = <10000>;
thermistor-beta = <3380>;
charging-enable;
vbatlow-charge-enable;
};
npm1300_ek_buttons: buttons {
compatible = "gpio-keys";
pmic_button0: pmic_button_0 {
gpios = < &npm1300_ek_gpio 0 GPIO_ACTIVE_HIGH>;
label = "Pmic button switch 0";
zephyr,code = <INPUT_KEY_0>;
};
};
npm1300_ek_leds: leds {
compatible = "nordic,npm1300-led";
nordic,led0-mode = "host";
nordic,led1-mode = "charging";
nordic,led2-mode = "error";
};
};
};
&led2 {
gpios = <&gpio0 30 0>;
};