34704_11 Datasheet, PDF (34/54 Pages) Freescale Semiconductor, Inc – Multiple Channel DC-DC Power Management IC

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
LED Current
IMAX * (1/16)
IMAX * (2/16)
IMAX * (3/16)
IMAX * (4/16)
IMAX * (5/16)
IMAX * (6/16)
IMAX * (7/16)
IMAX * (8/16)
IMAX * (9/16)
IMAX * (10/16)
IMAX * (11/16)
IMAX * (12/16)
IMAX * (13/16)
IMAX * (14/16)
IMAX * (15/16)
IMAX (Default)
MSB
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
LSB
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
ACCURATE I²C COMMUNICATION MODE
The 34704 assigns 1 bit to enable the Accurate I²C
communication mode (ACCURATE). Setting this bit enables
the Accurate mode in which each command and data should
be sent 2 times to avoid false commands.
USER ACCESSIBLE FLAG REGISTERS
Cold Start Flag
The 34704 assigns 1 bit (COLDF) to flag the processor
that the power up was a result of battery insertion and not
through ONOFF pin. This flag should be cleared after power
up by the processor.
Cold Start Flag
bit
/ONOFF (Default)
0
Battery Insertion
1
Shutdown Flag
The 34704 assigns 1 bit (SHUTDOWN) to flag the
processor if a shutdown signal is received through the
ONOFF pin and a programmable time period with a default of
1sec has elapsed.
/ONOFF Status
bit
Normal (Default)
0
Shutdown
1
Dynamic Voltage Scaling Status Flag
In addition and for each regulator, 34704 assigns 1 bit
(DVSSTATx) to flag to the processor that the desired output
voltage level set with the DVSSETx bits has been reached.
DVS STATUS
bit
DVS Not Done
0
DVS Done
1
USER ACCESSIBLE FAULT REGISTERS
Over-current Fault Register
The 34704 assigns 1 bit for each regulator (ILIMFx) to
indicate a fault due to over-current limit, where x corresponds
to each regulator from REG1 to REG8, except REG7
ILIMF
bit
False
0
True
1
Short-circuit Fault Register
The 34704 assigns 1 bit for each regulator (SCFx) to
indicate a fault due to short-circuit current limit, where x
corresponds to each regulator from REG1 to REG8, except
REG7
SCF
bit
False
0
True
1
Over-voltage Fault Register
The 34704 assigns 1 bit for each regulator (OVFx) to
indicate a fault due to over-voltage limit, where x corresponds
to each regulator from REG1 to REG8
OVF
bit
False
0
True
1
Under-voltage Fault Register
The 34704 assigns 1 bit for each regulator (UVFx) to
indicate a fault due to under-voltage limit, where x
corresponds to each regulator from REG1 to REG8.
UVF
bit
False
0
True
1
Thermal Shutdown Fault Register
34704
34
Analog Integrated Circuit Device Data
Freescale Semiconductor