mc33911 Freescale Semiconductor, Inc, mc33911 Datasheet - Page 25

• Manufacturer Part Number: mc33911
• Description: Mc33911 Lin System Basis Chip With Dc Motor Pre-driver
• 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 33911 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 the 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
(VS1) voltage drops below the VSUV 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
The low-voltage interrupt signals when the supply line
Table 5. Operating Modes Overview
Notes
Analog Mux
55.
56.
57.
58.
Watchdog
Function
VSENSE
VDD
HS1
LSx
LIN
Lx
Operation can be controlled by the PWMIN input.
HS switch can be configured for cyclic sense operation in Stop Mode.
HS switch can be configured for cyclic sense operation in Sleep Mode.
Windowing operation when enabled by an external resistor.
Reset Mode Normal Request Mode
Full
On
-
-
-
-
-
-
150ms (typ.) timeout
SPI/PWM
SPI/PWM
V
Rx-Only
SUV
Inputs
Full
SPI
On
).
(55)
(55)
full/Rx-Only Rx-Only/Wake-up
On
SPI/PWM
SPI/PWM
High-voltage Interrupt
(VS1) voltage increases above the VSOV threshold (
Over-temperature Prewarning
temperature has reached the pre-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
cause the LIN driver to be disabled, except for the LIN over-
current. In order to restart an 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
shutdown in the high side output.
Low Side Over-temperature Shutdown
shutdown in the low side outputs.
Normal
Inputs
Mode
Full
SPI
(58)
On
The high-voltage interrupt signals when the supply line
Over-temperature prewarning signals when the 33911
These signal fault conditions within the LIN interface will
The LINOC bit functionality in the LIN Status Register
The high side over-temperature shutdown signals a
The low side over-temperature shutdown signals a
/Off
Stop Mode
Wake-up
Note
Stop
VDD
-
-
-
(56)
FUNCTIONAL DEVICE OPERATIONS
Sleep Mode
Wake-up
Wake-up
Note
-
-
-
-
-
(57)
OPERATIONAL MODES
V
SOV
33911
).
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