MC33910BAC / MC34910BAC
FUNCTIONAL DEVICE OPERATIONS
OPERATIONAL MODES
Interrupt
Control
Module
VDD
HVSE
VDD
PWMIN
PWMHSx
VS2
MOD1:2
HSx
High Side - Driver
charge pump
open load detection
on/off
Control
current limitation
overtemperture shutdown (interrupt maskable)
high voltage shutdown (maskable)
HSxOP
HSxCL
Status
HSx
Wakeup
Module
Figure 38. High Side Drivers HS1 and HS2
Open Load Detection
Interrupt Control Module. The shutdown is indicated as HS
Interrupt in the Interrupt Source Register (ISR).
Each high side driver signals an open load condition if the
current through the high side is below the open load current
threshold.
A thermal shutdown of the high side drivers is indicated by
setting all HSxOP and HSxCL bits simultaneously.
If the bit HSM is set in the Interrupt Mask Register (IMR),
then an interrupt (IRQ) is generated.
The open load condition is indicated with the bits HS1OP
and HS2OP in the High Side Status Register (HSSR).
A write to the High Side Control Register (HSCR), when
the over-temperature condition is gone, will re-enable the
high side drivers.
Current Limitation
Each high side driver has an output current limitation. In
combination with the over-temperature shutdown the high-
side drivers are protected against over-current and short-
circuit failures.
High-voltage Shutdown
In case of a high voltage condition and if the high voltage
shutdown is enabled (bit HVSE in the Mode Control Register
(MCR) is set) both high side drivers are shut down.
When the driver operates in the current limitation area, it is
indicated with the bits HS1CL and HS2CL in the HSSR.
A write to the High Side Control Register (HSCR), when
the high voltage condition is gone, will re-enable the high side
drivers.
Note: If the driver is operating in current limitation mode,
excessive power might be dissipated.
Over-temperature Protection (HS Interrupt)
Sleep And Stop Mode
Both high side drivers are protected against over-
temperature. In case of an over-temperature condition both
high side drivers are shut down and the event is latched in the
The high side driver can be enabled to operate in Sleep
and Stop mode for cyclic sensing. Also see Table 35,
Operating Modes Overview.
33910
Analog Integrated Circuit Device Data
Freescale Semiconductor
74
FREESCALE [ Freescale ]
