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908E622 Datasheet(PDF) 39 Page - Freescale Semiconductor, Inc

Part # 908E622
Description  Integrated Quad Half-bridge, Triple High Side amd EC Glass Driver with Embedded MCU and LIN for High End Mirror
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

908E622 Datasheet(HTML) 39 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
39
908E622
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
CRM — Current Recirculation Mode bit
This read/write bit selects the recirculation mode during
PWM. Reset clears the CRM bit.
1 = recirculation via switched on low side MOSFET
0 = recirculation via low side free wheeling diode
HBxOCF — Half-bridges Over-current Flag Bit
This read/write bit indicates that an over-current condition
on either the LS or the HS FET on HBx has occurred.
Clear HBxOCF and enable Half-bridge by writing a logic
[1] to HBxOCF. Writing a logic [0] to HBxOCF has no effect.
Reset clears the HBxOCF bit.
1 = over-current condition on HBx occurred
0 = no over-current condition on HBx
High Side Drivers
The high side outputs are low resistive high side switches
targeted for driving lamps. The high sides are protected
against over-temperature, over-current and over-voltage/
under-voltage.
Figure 23. HS Circuitry
HIGH SIDE OPERATING MODES
The high sides outputs are enabled if the PSON bit in the
System Control Register (SYSCTL) is set.
Each high side output is permanently switched on, if the
HSxON bit in the High Side Output Register (HSOUT) is set.
PWM control of the output is enabled, if the HSxPWM bit
High Side Output Register (HSOUT) is set. In this operating
mode, the high side MOSFET is on, if the input PWM signal
(PWM pin) is high.
Table shows the behavior of the high side MOSFETs
depending on the HSONx and PWMHSx bits.
VSUP
HSx
HS - Driver
charge pump
over-current protection
inrush current limiter
PWM
Control
on/off
Current
Limit
Status
PSON
HSxON
HSxPWM
PWM


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