Q&A: Does VIN have to be valid before programming PMIC over i2c?

Document created by Yixing Kong Employee on Sep 2, 2013
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Does VIN have to be valid before we can talk to the PMIC over i2c? Can a valid voltage on LICELL and VDDIO work instead?


The PF0100 datasheet says:


To communicate with I2C, VIN must be valid and VDDIO, to which SDA and SCL are pulled up, must be powered by a 1.7 to 3.6V supply. VIN, or the coin cell voltage must be valid to maintain the contents of the registers.


VIN and VDDIO must be valid for communicating to the I2C block. Having LICELL and VDDIO will not work since a portion of the digital circuitry needed for accessing the registers is powered through VIN.


This document was generated from the following discussion: Programming PMIC over i2c