34704 datasheet(34/54 Pages) FREESCALE

34 / 54 page

Analog Integrated Circuit Device Data



Freescale Semiconductor

34704

FUNCTIONAL DEVICE OPERATION

LOGIC COMMANDS AND REGISTERS

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.

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.

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.

USER ACCESSIBLE FAULT REGISTERS

Overcurrent Fault Register

The 34704 assigns 1 bit for each regulator (ILIMFx) to

indicate a fault due to overcurrent limit, where x corresponds

to each regulator from REG1 to REG8, except REG7

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

Overvoltage Fault Register

The 34704 assigns 1 bit for each regulator (OVFx) to

indicate a fault due to overvoltage limit, where x corresponds

to each regulator from REG1 to REG8

Undervoltage Fault Register

The 34704 assigns 1 bit for each regulator (UVFx) to

indicate a fault due to undervoltage limit, where x

corresponds to each regulator from REG1 to REG8.

Thermal Shutdown Fault Register

LED Current

MSB

LSB

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)

Cold Start Flag

bit

/ONOFF (Default)

Battery Insertion

/ONOFF Status

bit

Normal (Default)

Shutdown

DVS STATUS

bit

DVS Not Done

DVS Done

ILIMF

bit

False

True

SCF

bit

False

True

OVF

bit

False

True

UVF

bit

False

True

34704 Datasheet(PDF) 34 Page - Freescale Semiconductor, Inc

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