MIC7401 Datasheet, PDF (58/68 Pages) Micrel Semiconductor – Configurable PMIC, Five-Channel Buck Regulator plus One-Boost with HyperLight Load®, I2C Control, and Enable

Micrel, Inc.
MIC7401
Sequence Register (11’h)
Each regulator can be assigned to start in any one of six sequencing slots (1 to 6). If starting in slot 1, the regulator starts
immediately. If starting in any other slot the regulator must wait for the PGOOD=1 flags of all regulators assigned to the
preceding slot and then wait for the specified delay time (register 17’h) i.e., all PGOODs in preceding state flag then the
delay timer is started and when delay completes the regulator is enabled.
Each regulator must delay its startup (after the appropriate preceding PGOOD flags) by the delay set in the Delay
Register (17’h), unless the regulator is assigned to sequence state 0.
If all default Enable bits = 0 the IC starts up, but no outputs are enabled.
Sequencing is only used during initial startup, and not used when outputs are enabled via I²C command. If outputs are
enabled via I²C then soft-start is still active but start-up delays (timed from preceding PGOODS) are not.
Table 14. Sequence State 1 Register
Register Name
SEQ1_REG
Address
Field
bit R/W Default
Sequence Register
0x11’h
Description
REG1SQ1
0 R/W
0
0 = No Start
1 = Regulator 1 will Start in Sequence State 1
REG2SQ1
1 R/W
0
0 = No Start
1 = Regulator 2 will Start in Sequence State 1
REG3SQ1
2 R/W
0
0 = No Start
1 = Regulator 3 will Start in Sequence State 1
REG4SQ1
3 R/W
1
0 = No Start
1 = Regulator 4 will Start in Sequence State 1
REG5SQ1
4 R/W
0
0 = No Start
1 = Regulator 5 will Start in Sequence State 1
REG6SQ1
5 R/W
6 R/W
7 R/W
0
0 = No Start
0
Reserved
0
Reserved
1 = Regulator 6 will Start in Sequence State 1
March 16, 2015
58
Revision 1.0