FUNCTIONAL DEVICE OPERATIONS
LOGIC COMMANDS AND REGISTERS
WDERR - Watchdog Error
Table 26. Analog Multiplexer Channel Select
MX2
MX1
MX0
Meaning
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.
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Disabled
Reserved
Die Temperature Sensor
VSENSE input
L1 input
1 = WDCONF pin resistor missing
0 = WDCONF pin resistor not floating
WDOFF - Watchdog Off
L2 input
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.
L3 input
L4 input
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.
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.
Table 27. Configuration Register - $D
C3
C2
C1
C0
1 = Watchdog window open
0 = Watchdog window closed
Write
HVDD
CYSX8
CSAZ
CSGS
Reset
Value
0
0
0
0
Analog Multiplexer Control Register - MUXCR
POR, Reset
Mode or
ext_reset
Reset
Condition
This register controls the analog multiplexer and selects
the divider ration for the Lx input divider.
POR
POR
POR
Table 25. Analog Multiplexer Control Register -$C
HVDD - Hall Sensor Supply Enable
C3
C2
C1
C0
This write-only bit enables/disables the state of the hall
sensor supply.
Write
LXDS
MX2
MX1
MX0
1 = HVDD on
0 = HVDD off
Reset
Value
1
0
0
0
CYSX8 - Cyclic Sense Timing x 8.
Reset
Condition
POR
POR, Reset Mode or ext_reset
This write-only bit influences the cyclic sense period as
shown in Table 23.
LXDS - Lx Analog Input Divider Select
1 = Multiplier enabled
0 = None
This write-only bit selects the resistor divider for the Lx
analog inputs. Voltage is internally clamped to VDD.
0 = Lx Analog divider: 1
CSAZ - Current Sense Auto-Zero Function Enable
1 = Lx Analog divider: 3.6 (typ.)
This write-only bit enables/disables the circuitry to lower
the offset voltage of the current sense amplifier.
MXx - Analog Multiplexer Input Select
1 = Auto-zero function enabled
0 = Auto-zero function disabled
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.
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.)
33912
Analog Integrated Circuit Device Data
Freescale Semiconductor
41
FREESCALE [ Freescale ]
