[Help] Issues with replacing domestically produced switch chips!!!

w494143467

[Help] Issues with replacing domestically produced switch chips!!! [Copy link]

 

The current product uses the STM6601 chip, but it is out of stock. Now we want to replace it with a domestic chip. Let me briefly talk about the functions of this chip.

This chip is always powered, and the [PB] pin is connected to a switch. When the switch is pressed, the chip works and the [EN] pin outputs a high level. This pin is connected to the power management chip, and then the system is successfully powered on. At the same time, the [INT] pin can synchronously reflect the status of the [PB] pin.

I just want to find a chip with similar functions.

littleshrimp

There is no microcontroller used in the following circuit, right?

w494143467

littleshrimp posted on 2021-11-2 16:57 There is no microcontroller used in the following circuit, right?

Yes, after the microcontroller is powered on, the PSHOLD pin needs to be pulled high. If you want to power off, the microcontroller can pull the PSHOLD pin low.

littleshrimp

w494143467 published on 2021-11-3 09:55 Yes, after the microcontroller is powered on, the PSHOLD pin needs to be pulled high. If the power is to be turned off, the microcontroller can pull the PSHOLD pin low.

In addition to power-on retention, are there any other special functions? Can it be built with discrete components?

annysky2012

Visit Shanghai Belling

w494143467

littleshrimp posted on 2021-11-3 10:06 In addition to power-on retention, are there any other special functions? Can it be built with discrete components?

After booting up, it can detect when a key is pressed, and the system can automatically power off. It is actually a bit complicated. I am currently trying to build a circuit using discrete components.