908E621_12 Datasheet, PDF (38/60 Pages) Freescale Semiconductor, Inc – Integrated Quad Half bridge and Triple High Side Embedded MCU and LIN for High End Mirror

FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Half-bridge Status and Control Register (HBSCTL)
Register Name and Address: HBSCTL - $03
Bit7
6
5
4
3
2
1
Bit0
Read
0
0
0 HB4 HB3 HB2 HB1
CRM
OCF OCF OCF ^OCF
Write
Reset 0
0
0
0
0
0
0
0
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 freewheeling 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.
VSUP
PSON
HSxON
HSxPWM
PWM
Control
on/off
Status
Current
Limit
HS - Driver
charge pump
over-current protection
inrush current limiter
PWM
HSx
Figure 23. HS Circuitry
HIGH SIDE OPERATING MODES
The high side 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.
The following table shows the behavior of the high side
MOSFETs depending on the HSONx and PWMHSx bits.
908E621
38
Analog Integrated Circuit Device Data
Freescale Semiconductor