MIC2827 Datasheet, PDF (18/27 Pages) Micrel Semiconductor – Triple Output PMIC with HyperLight Load™ DCDC, two LDOs, and I2C Control

Micrel, Inc.
Functional Description – I²C Control
Registers
Register
Address
00h
Register
Name
Enable
Read/
Write
R/W
01h
Status
R/W
02h
DC-DC R/W
03h
LDO1
R/W
04h
LDO2
R/W
Description
Enable and startup control
register
Regulator output & fault
condition status register
DC-DC regulator voltage
control register
LDO1 voltage control
register
LDO2 voltage control
register
MIC2827
Enable/Startup Control Register (00h):
The Enable Register is used to allow control of the
MIC2827’s power supplies. It allows each supply to be
turned on and off, and whether sequencing is used.
When a default startup is executed as a result of the EN
pin being taken from low to high, the Sequence Control,
and Supply Enable bits are all set to their default values.
The Sequence Control bit, only implemented in
sequence-enabled parts, must be used carefully. See
the section on “Ensuring Clean Switching in Sequence-
Enabled Parts”.
Name
Access
POR Value
Data
D7
D6
Reserved
N/A
00
00
D5
POAF
R/W
1
0 = Remain off
after fault
1 = Restore
power after fault
D4
SEQ CNT
R/W
0
0 = Sequencing
enabled
1 = Sequencing
disabled
D3
Reserved
N/A
0
D2
LDO2-EN
R/W
0
D1
LDO1-EN
R/W
0
0 = Disable
1 = Enable
D0
DC-EN
R/W
0
Set by Default
Startup?
Yes
Set by a
No
fault?
Yes
Yes
Yes
No
Yes
No
Yes
Yes, if POAF=1
July 2009
18
M9999-072709-A