908E621_12 Datasheet, PDF (33/60 Pages) Freescale Semiconductor, Inc – Integrated Quad Half bridge and Triple High Side Embedded MCU and LIN for High End Mirror

SS3 SS2 SS1 SS0
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
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Channel
Chip temperature
VSUP prescaler
Pin A0
Pin A0CST
not used
not used
not used
not used
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Hall-effect Sensor Input Pin H0
The H0 pin can be configured as general purpose input
(H0MS = 0) or as hall-effect sensor input (H0MS = 1) to be
able to read 3-pin / 2-pin hall sensors or switches.
VDD
10k
H0PD
H0MS
VSUP
H0MS
H0F
H0EN
H0
H0EN
Current
Sense
Figure 18. General purpose / Hall-effect Sensor Input (H0)
Current Coded Hallsensor Input
H0 is selected as “2-pin Hall-sensor input”, if the
corresponding H0MS bit in the H0/L0 Status and Control
Register (HLSCTL) is set. In this mode, the pin current to
GND is monitored by a special sense circuitry. Setting the
H0EN bit in the H0/L0 Status and Control Register, switches
the output to VSUP and enables the sense circuitry. The
result of the sense operation is given by the H0F flag. The
flag is low if the sensed current is higher than the sense
current threshold I_HSCT. In this configuration, the HO pin is
protected (current limitation) against short-circuit to GND.
After switching on the hallport (H0EN = “1”), the Hall-
sensor needs some time to stabilize the output. In RUN
mode, the software has to take care about waiting for a few
µs (40) before sensing the hall-flags.
The hall-port output current is sensed. In case of an over-
current (short to GND), the hall-port over-current flag
(H0OCF) is set and the current is limited. For proper
operation of the current limitation, an external capacitor
(>100 nF) close to the H0 pin is required.
Analog Integrated Circuit Device Data
Freescale Semiconductor
908E621
33