2.6 I2C Registers Maps and Bit Definitions
For each Buck regulator, the user can program different voltages, ON/OFF status and mode of operation (FPWM or Auto PFM) for each of the four power states. For LDOs, mode of operation is not applicable.
The following Register Summary provides the registers mapping of all the bits available in the user registers space of MCP16503.
In Register Summary, each BLACK bit in the volatile (I2C-accessible) register has a corresponding bit in the OTP bank. The default values of the BLACK bits in the volatile registers are loaded from the OTP bank.
It is possible to program the OTP at the factory to generate additional product variants with different default values for the BLACK bits. Please contact your nearest Microchip Sales Office for further assistance with the development of customized default configurations.
The default values of the RED bits are:
- Either hardwired in metal mask; or
- For the VSET[5:0] bits in RED, when the decoding process is complete, the detected start-up voltage settings are stored in the VSET[5:0] fields of the OUTx-A and LDOx-A registers. These values are then copied to the corresponding VSET[5:0] fields in OUTx-LPM, OUTx-HIB, OUTx-HPM, LDOx-LPM, LDOx-HIB, and LDOx-HPM.
The following topics, SYS-ADR to LDO2-CFG, provide the descriptions of the registers (bits/bit fields).
Default Registers Content shows the default value of each register.
Legend:
- R = READ access
- R/W = READ/WRITE access
- RoR = Reset-on-Read. After the value of the bit has been read, it will be cleared automatically.