Re-Programming the EEPROM of the TPS652170 Device
19
SLVUBH6 – November 2018
Copyright © 2018, Texas Instruments Incorporated
Software Instructions
Figure 18. Modifying DCDC2-3, LDOx, and LSx Register Values
NOTE:
Extreme changes in output voltage settings for DCDC1-3 and LDO1-4 may not settle to the
desired voltage before the TPS652170 supervisor circuitry recognizes the voltage as an
undervoltage fault condition and performs a system reset. This will reset the DCDC1-3 and
LDO1-4 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
ENABLE
register (0x16) 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
SEQ1
,
SEQ2
, and
SEQ3
registers
(0x19, 0x1A, and 0x1B), as shown in
. The
SEQ4
register (0x1C) controls the sequence
order of LS2/LDO4 but this register does not need to be changed for this example.
