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板凳
楼主 |
发表于 2024-8-21 16:50:30
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您好,我看到PROD电源芯片,RK809手册里是具备守时功能,这个可以直接用吗,我们给RK809的VCC_RTC_S5外加电池改造一下,在系统电源掉电后,RK809能否保持时间,我们这个已经购买了一批,重新换成本很大。
查阅RK809相关的资料,描述如下:
4.6 REAL TIME CLOCK (RTC)
The RK809 integrates a crystal oscillator buffer and a real time clock (RTC). The buffer
RK809 Datasheet Rev 1.01
Copyright ©2018 Fuzhou Rockchip Electronics Co., Ltd. 22
works with an external 32.768kHz crystal oscillator. With the RTC function, the PMIC provides second/minute/hour/day/month/year information, alarm wake up as well as time calibration. The RK817 provides one channel of 32.768kHz clocks with open drain outputs, where it is default on and is controlled through I2C interface.
4.7 RC OSCILLATOR
The RK809 integrates an RC oscillator. If the external crystal oscillator is not connected, the chip will be driven by the internal RC oscillator. Without external crystal oscillator , the system costs can be saved, but the RTC and the fuel gauge will be inaccurate. |
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