MM908E622ACDWBR2 FREESCALE [Freescale Semiconductor, Inc], MM908E622ACDWBR2 Datasheet - Page 40

• Manufacturer Part Number: MM908E622ACDWBR2
• Description: Integrated Quad Half-bridge, Triple High Side and EC Glass Driver with Embedded MCU and LIN for High End Mirror
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

HIGH SIDE OPERATING MODES
System Control Register (SYSCTL) is set.
HSxON bit in the High Side Output Register (HSOUT) is set.
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.
depending on the HSONx and PWMHSx bits.
Table 10. High-Side Configuration Bits
40
908E622
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
HSxPWM
PWM
The high sides outputs are enabled if the PSON bit in the
Each high side output is permanently switched on, if the
PWM control of the output is enabled, if the HSxPWM bit
Table 10
HSxPWM
HSxON
PSON
0
0
shows the behavior of the high side MOSFETs
HSxON
0
1
Control
Mode
High side MOSFET off
High side MOSFET on, in case of over-
current the over-current flag (HSxOCF)
is set and the high side MOSFET is
turned off
Current
Status
on/off
Limit
over-current protection
Figure 23. HS Circuitry
inrush current limiter
HS - Driver
charge pump
PWM
High Side Over-voltage / Under-voltage Protection
conditions. This protection is done by the low and high
voltage interrupt circuitry. If an over /under-voltage condition
is detected (LVIF / HVIF), and the VIS Bit is in the High Side
Status Register is cleared, the output is disabled.
HSxPWM
The outputs are protected against under / over-voltage
1
1
HSxON
0
1
VSUP
Analog Integrated Circuit Device Data
Mode
In this mode, the PWM duty cycle is
either controlled by the PWM input
signal, or when the over-current
shutdown value is reached by the part
itself.
Without reaching the over-current
shutdown, the high side driver is
directly driven from the PWM input
signal. If the Input signal is high, the
output is on. If low, the output is off
(PWM control).
If the current reaches the over-current
shutdown value, the high side will be
automatically turned off. With the next
rising edge of the PWM input signal, the
output will turn on again (current
limitation). The HSxOCF bit will be set,
software has to distinguish between an
inrush current, and a real short on the
output.
High side MOSFET is switched on and
the inrush current limitation is enabled.
This means the high side will start
automatically with a current limitation
around the over-current shutdown
threshold. (PWM signal must be
applied, see
If the high side enters current limitation
the HSxOCF bit is set, but the output is
not disabled. The software needs to
distinguish between an inrush current
and a real short on the output.
HSx
Freescale Semiconductor
Figure
24)