【GD32L233C-START Review】Three Power Consumption

hl23889909

【GD32L233C-START Review】Three Power Consumption [Copy link]

 

1. Introduction to Low Power

GD32L23X provides 10 power saving modes, which are relatively rich and can be selected according to different applications. The parameters I am most concerned about are the maximum power consumption of the microcontroller, the minimum power consumption in sleep mode, and the sleep wake-up time:

From Table 4-7 of the data sheet, we can see that when all peripherals are turned on, the maximum power consumption of the main frequency 64M is only 9.02mA, the lowest power consumption external crystal oscillator and RTC are turned on, and the 1.71V power supply is 0.43uA, which is very low power consumption. This power consumption is worthy of the name of L series; from Table 4-6, we can see that the wake-up time from sleep mode is 1.29uS, and the wake-up time from standby mode is 20.92uS, which can be said to be very fast and can be ignored for general use.

2. Initialization

Initialization is relatively simple, just enable the clock and wake-up pin, and then clear the flag.

3. Test phenomenon

In order to facilitate the test of power consumption, the 3.3V connected to GDLINK is cut off to ensure the independence of the power supply of the microcontroller, then a jumper line is connected in series with a multimeter to test the current.

After running for 5 seconds, it goes into sleep mode. Test the standby power consumption:

Running power consumption: (only serial port is opened and wakup0 is configured) about 6mA current.

Standby power consumption: only 0.35uA, which is lower than the maximum 0.4uA in the manual. Maybe my meter has errors, but this power consumption is very ideal.

4. Summary

This section focuses on testing the low power consumption function. The test results are ideal. The operating power consumption and standby power consumption are very low, and the wake-up is also very fast. Of course, the final product is concerned with the power consumption of the entire board, but this microcontroller can run at a main frequency of 64M and has a standby power consumption of less than 0.4uA, so it is still worth recommending.

Jacktang

The OP was able to measure the standby power consumption to be only 0.35uA, which seems to be quite accurate.

freebsder

350nA, still OK

hl23889909

freebsder posted on 2022-3-7 22:33 350nA, still OK

Yes, we can make low power consumption products

韵湖葱白

I don't understand the part about the method of measuring power consumption. Can you explain it in detail?

wangerxian

Haha, I finally cut it open, and I feel that the power consumption is really ideal!

freebsder

hl23889909 posted on 2022-3-7 23:35 Yes~ it is possible to make low-power products

It is useless to put the kernel to sleep, which is equivalent to crashing the system and not being able to process anything. When sleeping, the power consumption and functions of some dedicated peripherals should be considered. You can refer to how Silicon's EFM MCU does it.

hl23889909

Yunhu Congbai published on 2022-3-8 09:19 I don’t understand the power consumption measurement method. Can you explain it in detail?

Disconnect the 3.3V of the MCU from the 3.3V of the board, then connect a 3.3V serial multimeter from the board GDLINK to the 3.3V power supply of the MCU, and see the third test phenomenon, the first two pictures, disconnect and connect the power supply.

hl23889909

freebsder posted on 2022-3-8 22:47 It is useless to just put the kernel to sleep. It is equivalent to crashing the system and not being able to process anything. When sleeping, it mainly depends on the power consumption and functions of some dedicated peripherals. You can refer to...

This depends on how the peripherals are designed. For example, if I want to connect an LCD, I use a MOS tube to control the power supply of the LCD. The high conduction power supply and the circuit pull-down will only work when the microcontroller is powered up. After standby, the IO of the microcontroller defaults to a high impedance state, so the LCD will not consume power.

hjl2832

hl23889909 published on 2022-3-11 06:01 This depends on how the peripherals are designed. For example, if I want to connect an LCD, I use a MOS tube to control the power supply of the LCD, high conduction power supply, and the circuit is pulled down, only...

This power consumption is not in sleep mode, but in shutdown mode. Only a limited number of interrupts can wake up the device. It is not convenient to use this mode in actual products. Low-power sleep mode is more commonly used in general products. I have also tested it. The lowest power consumption I have measured in sleep mode is several hundred uA.

韵湖葱白

hl23889909 posted on 2022-3-11 05:53 Disconnect the 3.3V of the microcontroller from the 3.3V of the board, and then connect a 3.3V series multimeter from the board GDLINK to the 3.3V power supply of the microcontroller, and see the 3rd ...

Got it, thanks

zhangdaoyu

Such low power consumption is worth looking forward to. You can consider using this chip in later designs.

freebsder

hl23889909 posted on 2022-3-11 06:01 This depends on how the peripheral is designed. For example, if I want to connect an LCD, I use a MOS tube to control the power supply of the LCD, high conduction power supply, and the circuit gives a pull-down, only...

Yours is not low power consumption. Low power consumption generally refers to the MCU sleeping or deep sleeping, and then leaving some IO or time or something to wake up the MCU. However, the low power consumption of Little Gecko also includes some peripherals for sensors. This peripheral is equivalent to another low power coprocessor. You can configure the mode or operation for this peripheral, and this peripheral will monitor the sensor data and events. When the mode you set is met, it will either wake up the MCU core or perform some primary operations if necessary to wake up the MCU.

hl23889909

freebsder posted on 2022-3-11 22:57 This is not low power consumption. Low power consumption generally refers to MCU sleep and deep sleep, and then leaving some io or time or something to wake up the MCU. ...

This depends on the usage scenario. For example, if you connect an external motion sensor and set a threshold, when the vibration is reached, the motion sensor will send an interrupt signal to the wake-up pin, which can also wake up the microcontroller. As long as the startup time is short enough and there is no delay in waking up, it is possible. For example, when the mobile phone is lifted up to display and enters the most power-saving mode, doesn't it save more energy?

hl23889909

zhangdaoyu posted on 2022-3-11 17:58 Such low power consumption is worth looking forward to. You can consider using this chip in later designs

You deserve it~ After so many years of development, domestic microcontrollers have become very mature.