34704 datasheet(34/54 Pages) FREESCALE

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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.

Cold Start Flag

bit

/ONOFF (Default)

Battery Insertion

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)

Shutdown

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

DVS Done

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

True

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

True

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

True

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

True

Thermal Shutdown Fault Register

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

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

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