MC33912_10 Datasheet, PDF (37/94 Pages) Freescale Semiconductor, Inc – LIN System Basis Chip with DC Motor Pre-driver and Current Sense

MC33912G5AC / MC34912G5AC
FUNCTIONAL DEVICE OPERATIONS
OPERATIONAL MODES
circuit condition, either 5.0 V or Ground, the RXSHORT bit in
the LIN Status Register (LINSR) is set and the transmitter is
shut down.
If the LINM bit is set in the Interrupt Mask Register (IMR),
an Interrupt IRQ will be generated.
The transmitter is automatically re-enabled once the
condition is gone (transition on RXD) and TXD is high.
A read of the LIN Status Register (LINSR) without the RXD
pin short-circuit condition will clear the bit RXSHORT.
TXD Dominant Detection (LIN Interrupt)
The LIN transceiver monitors the TXD input pin to detect a
stuck in dominant (0 V) condition. In case of a stuck condition
(TXD pin 0 V for more than 1 second (typ.)), the transmitter is
shut down and the TXDOM bit in the LIN Status Register
(LINSR) is set.
If the LINM bit is set in the IMR, an Interrupt IRQ will be
generated.
The transmitter is automatically re-enabled once TXD is
high.
A read of the LIN Status Register (LINSR) with the TXD pin
at 5.0 V will clear the bit TXDOM.
LIN Receiver Operation Only
While in Normal mode, the activation of the RXONLY bit
disables the LIN TXD driver. In case of a LIN error condition,
this bit is automatically set. If Stop mode is selected with this
bit set, the LIN wake-up functionality is disabled and the RXD
pin will reflect the state of the LIN bus.
STOP Mode And Wake-up Feature
During Stop mode operation, the transmitter of the
physical layer is disabled. The receiver is still active and able
to detect wake-up events on the LIN bus line.
A dominant level longer than T_PROPWL followed by a rising
edge will generate a wake-up interrupt, and will be reported
in the Interrupt Source Register (ISR). Also see Figure 11,
page 22.
SLEEP Mode And Wake-up Feature
During Sleep mode operation, the transmitter of the
physical layer is disabled. The receiver must be active to
detect wake-up events on the LIN bus line.
A dominant level longer than T_PROPWL followed by a rising
edge will generate a system wake-up (Reset), and will be
reported in the Interrupt Source Register (ISR). Also see
Figure 10, page 22.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33912
37