电池充电器的PWM输入看门狗保护

摘要：添加看门狗保护的充电器的输入电路免受损害了手机卫士，当基带处理档或停止软件的执行。

Maxim > App Notes > BATTERY MANAGEMENT MICROPROCESSOR SUPERVISOR CIRCUITS

Keywords: mobile phones, battery charging, microprocessor supervisors, pulse-width modulation, watchdog Sep 16, 2005
protection

APPLICATION NOTE 3623
Battery-Charger PWM Input Has Watchdog Protection

Abstract: Adding watchdog protection to the charger-input circuitry of a mobile phone guards against damage
when the baseband processor stalls or ceases software execution.

Mobile-phone batteries are usually charged through a proprietary charging algorithm in the baseband controller.
The phone's charger input is connected to the internal battery through a p-channel switch of low on-resistance,
controlled by a pulse-width modulation (PWM) signal from the baseband controller (Figure 1). To minimize power
dissi