Re-Programming the EEPROM of the TPS65218D0 Device
19
SLVUBH5 – October 2018
Copyright © 2018, Texas Instruments Incorporated
Software Instructions
Figure 19. Modifying DCDC2-4 and LDO1 Register Values
NOTE:
Extreme changes in output voltage settings for DCDC1-4 and LDO1 may not settle to the
desired voltage before the TPS65218D0 supervisor circuitry recognizes the voltage as an
overvoltage or undervoltage fault condition and performs a system reset. This will reset the
DCDC1-4 and LDO1 registers to the value currently stored in EEPROM and is desirable in
the end application, but it will prevent successful re-programming with new output voltage
settings. If this issue is observed while modifying registers prior to re-programming the
EEPROM, then a value of 0x00 must be written to the
ENABLE1
and
ENABLE2
registers
(0x11 and 0x12) before re-starting this procedure.
•
To match the example, the order in which the DC/DC converters and LDO turn on and turn off is must
be changed. This order, or sequencing, is changed by modifying the
SEQ3
,
SEQ4
, and
SEQ6
registers
(0x22, 0x23, and 0x25), as shown in
. GPIO3 is no longer used to trigger a warm-reset for
DCDC1 and DCDC2, so the
SEQ7
register (0x26) has been modified to enable GPIO3 in the
sequence to indicate all of the DC/DC converters and LDO1 have been enabled.
