33912 datasheet(41/47 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33912

FUNCTIONAL DEVICE OPERATIONS

LOGIC COMMANDS AND REGISTERS

WDERR - Watchdog Error

This read-only bit signals the detection of a missing

watchdog resistor. In this condition the watchdog is using the

internal, lower precision timebase. The Windowing function is

disabled.

1 = WDCONF pin resistor missing

0 = WDCONF pin resistor not floating

WDOFF - Watchdog Off

This read-only bit signals that the watchdog pin connected

to Ground and therefore disabled. In this case watchdog

timeouts are disabled and the device automatically enters

Normal Mode out of Reset. This might be necessary for

software debugging and for programming the Flash memory.

1 = Watchdog is disabled

0 = Watchdog is enabled

WDWO - Watchdog Window Open

This read-only bit signals when the watchdog window is

open for clears. The purpose of this bit is for testing. Should

be ignored in case WDERR is High.

1 = Watchdog window open

0 = Watchdog window closed

Analog Multiplexer Control Register - MUXCR

This register controls the analog multiplexer and selects

the divider ration for the Lx input divider.

LXDS - Lx Analog Input Divider Select

This write-only bit selects the resistor divider for the Lx

analog inputs. Voltage is internally clamped to VDD.

0 = Lx Analog divider: 1

1 = Lx Analog divider: 3.6 (typ.)

MXx - Analog Multiplexer Input Select

These write-only bits selects which analog input is

multiplexed to the ADOUT0 pin according to Table 26.

When disabled or when in Stop or Sleep Mode, the output

buffer is not powered and the ADOUT0 output is left floating

to achieve lower current consumption.

Table 26. Analog Multiplexer Channel Select

Configuration Register - CFR

This register controls the Hall Sensor Supply enable/

disable, the cyclic sense timing multiplier, enables/disables

the Current Sense Auto-zero function and selects the gain for

the current sense amplifier.

HVDD - Hall Sensor Supply Enable

This write-only bit enables/disables the state of the hall

sensor supply.

1 = HVDD on

0 = HVDD off

CYSX8 - Cyclic Sense Timing x 8.

This write-only bit influences the cyclic sense period as

shown in Table 23.

1 = Multiplier enabled

0 = None

CSAZ - Current Sense Auto-Zero Function Enable

This write-only bit enables/disables the circuitry to lower

the offset voltage of the current sense amplifier.

1 = Auto-zero function enabled

0 = Auto-zero function disabled

CSGS - Current Sense Amplifier Gain Select

This write-only bit selects the gain of the current sense

amplifier.

1 = 14.5 (typ.)

0 = 30 (typ.)

Table 25. Analog Multiplexer Control Register -$C

Write

LXDS

MX2

MX1

MX0

Reset

Value

000

Reset

Condition

POR

POR, Reset Mode or ext_reset

MX2

MX1

MX0

Meaning

Disabled

Reserved

Die Temperature Sensor

VSENSE input

L1 input

L2 input

L3 input

L4 input

Table 27. Configuration Register - $D

Write

HVDD

CYSX8

CSAZ

CSGS

Reset

Value

Reset

Condition

POR, Reset

Mode or

ext_reset

POR

33912 Datasheet(PDF) 41 Page - Freescale Semiconductor, Inc

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