mc33910bac/r2 Freescale Semiconductor, Inc, mc33910bac/r2 Datasheet - Page 25

• Manufacturer Part Number: mc33910bac/r2
• Description: Lin System Basis Chip With 2x60ma High Side Drivers
• Manufacturer: Freescale Semiconductor, Inc

INTERRUPTS
peripheral needs to be serviced. The interrupts which can be
generated change according to the Operating Mode. While in
Normal and Normal Request modes the 33910 signals
through interrupts special conditions which may require a
MCU software action. Interrupts are not generated until all
pending wake-up sources are read in the interrupt source
register (ISR).
events. Sleep Mode does not use interrupts, wake-up is
performed by powering-up the MCU. In Normal and Normal
Request Mode the wake-up source can be read by SPI.
of the IRQ pin, which will remain low until the interrupt is
acknowledged by a SPI read. The IRQ pin will then be driven
high.
Request and Stop Mode. Interrupts are not generated while
the RST pin is low.
Normal Request Modes, some of those can be masked by
writing to the SPI-interrupt mask register (IMR).
Low Voltage Interrupt
the VSUV threshold (
High Voltage Interrupt
above the VSOV threshold (
Analog Integrated Circuit Device Data
Freescale Semiconductor
Interrupts are used to signal a microcontroller that a
While in Stop Mode, interrupts are used to signal wake-up
The interrupts are signaled to the MCU by a low logic level
Interrupts are only asserted while in Normal-, Normal
Following is a list of the interrupt sources in Normal and
Signals when the supply line (VS1) voltage drops below
Signals when the supply line (VS1) voltage increases
Table 5. Operating Modes Overview
Notes
Analog Mux
51.
52.
53.
54.
55.
Watchdog
Function
VSENSE
HVDD
VDD
HSx
LIN
L1
V
Operation can be enabled/controlled by the SPI.
Operation can be controlled by the PWMIN input.
HSx switches can be configured for cyclic sense operation in Stop Mode.
HSx switches can be configured for cyclic sense operation in Sleep Mode.
Windowing operation when enabled by an external resistor.
SUV
).
V
SOV
Reset Mode Normal Request Mode
).
full
On
-
-
-
-
-
-
150ms (typ.) timeout
SPI/PWM
Rx-Only
SPI
Input
SPI
On
full
(51)
(52)
full/Rx-Only Rx-Only/Wake-up
SPI/PWM
On
Over-Temperature Prewarning
shutdown warning threshold. It is used to warn the MCU that
an over-temperature shutdown in the main 5V regulator is
imminent.
LIN Over-Current Shutdown / Over-Temperature
Shutdown / TXD Stuck At Dominant / RXD Short-Circuit
the LIN over-current) that had led to disable the LIN driver. In
order to restart operation, the fault must be removed and
must be acknowledged by reading the SPI.
(LINSR) is to indicate that an LIN over-current occurred and
the driver stays enabled.
High Side Over-Temperature Shutdown
RESET
time the reset condition lasts.
machine will drive the RST output low for at least 1ms typical
value before driving it high.
5V Regulator Low-Voltage-Reset (V
against brown outs. If the supply monitor detects that the
voltage at the VDD pin has dropped below the reset threshold
V
Normal
Mode
Input
RSTTH
SPI
SPI
(55)
On
full
Signals when the 33910 temperature has reached the pre-
These signal faulty conditions in the LIN interface (except
The LINOC bit functionality in the LIN status register
Signals a shutdown of the high side outputs.
To reset an MCU, the 33910 drives the RST pin low for the
After the reset source has been removed the state
In the 33910 four main reset sources exist:
The 5V regulator output V
/Off
the 33910 will issue a reset. In case of over-
Stop Mode
Wake-up
Note
VDD
stop
-
-
-
(53)
FUNCTIONAL DEVICE OPERATIONS
Sleep Mode
DD
Wake-up
Wake-up
Note
is continuously monitored
-
-
-
-
-
(54)
OPERATIONAL MODES
RSTTH
)
33910
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