Bandgap Vref tolerance on PIC18FxxJxx - Raspberry Pi Forums

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i'm building power controller pi (on/off button, wake on rtc, shutdown via i2c , supply glitch detection, etc.) based around pic18f27j13.

voltage monitoring, need absolute reference, , pic has own bandgap reference circuit, datasheet gives no details, stating it's '~1.2v' - no tolerance data.

measure 1.202v@vdd = 3.3v, , 1.198v@vdd = 3v, seems pretty accurate, luck - don't have more chips test against.

have experience of using reference, , has been accurate you? opinions i've found searching net pic chips 1.024v references have been slated poor accuracy, suspect circuit has improved 1.2v references (j & k family of chips).



raspberrypi



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