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最新推荐文章于 2021-07-01 23:15:13 发布

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本文介绍了一种设备中的备用电池管理系统，该系统可以根据主电池和备用电池电压的不同情况切换供电方式。当主电池电压高于设定阈值时，系统由主电池供电，并可以对备用电池进行充电；当主电池电压低于阈值时，系统进入复位状态。备用电池可以在主电池的支持下维持32kHz振荡器及备用寄存器的运行。

6.6 Backup Battery Management
The device includes a back-up battery switch connecting the VRTC regulator input to a main battery
(VCC7) or to a back-up battery (VBACKUP), depending on the batteries voltage value.
The VRTC supply can then be maintained during a BACKUP state as far as the input voltage is high
enough (>VBNPR threshold). Below the VBNPR voltage threshold the digital core of the device is set
under reset by internal signal POR (Power-on Reset).
The back-up domain functions which are always supplied from VRTC comprehend:
• The internal 32-kHz oscillator
• Backup registers
The back-up battery can be charged from the main battery through an embedded charger. The back-up
battery charge voltage and enable is controlled through BBCH_REG register programming. This register
content is maintained during the device Backup state.
Hence enabled the back-up battery charge is maintained as far as the main battery voltage is higher than
the VMBLO threshold and the back-up battery voltage.