FUNCTIONAL DEVICE OPERATIONS
OPERATIONAL MODES
The LIN driver is a low side MOSFET with over-current
and thermal shutdown. An internal pull-up resistor with a
serial diode structure is integrated, so no external pull-up
components are required for the application in a slave node.
The fall time from dominant to recessive and the rise time
from recessive to dominant is controlled. The symmetry
between both slopes is guaranteed.
LIN PHYSICAL LAYER
The LIN bus pin provides a physical layer for single-wire
communication in automotive applications. The LIN physical
layer is designed to meet the LIN physical layer specification
and has the following features:
• LIN physical layer 2.0 compliant
• Slew rate selection
• Over-current shutdown
LIN Pin
• Over-temperature shutdown
• LIN pull-up disable in Stop and Sleep Modes
• Advanced diagnostics
The LIN pin offers a high susceptibility immunity level from
external disturbance, guaranteeing communication during
external disturbance.
• LIN dominant voltage level selection
INTERRUPT
CONTROL
MODULE
WAKE-UP
MODULE
High-voltage
Shutdown
High Side
Interrupt
LIN
Wake-up
MOD1:2
LSR0:1
LINPE
VS1
LIN – DRIVER
LDVS
Slope and Slew Rate Control
Over-current Shutdown (interrupt maskable)
Over-temperature Shutdown (interrupt maskable)
RXONLY
RXSHORT
TXDOM
LINOT
LINOC
30K
LIN
TXD
RXD
SLOPE
CONTROL
LGND
WAKE-UP
FILTER
RECEIVER
Figure 19. LIN Interface
Slew Rate Selection
LIN Pull-up Disable In Stop And Sleep Modes
The slew rate can be selected for optimized operation at
10.4 and 20kBit/s as well as a fast baud rate for test and
programming. The slew rate can be adapted with the bits
LSR1:0 in the LIN Control Register (LINCR). The initial slew
rate is optimized for 20kBit/s.
In cases of a LIN bus short to GND or LIN bus leakage
during low-power mode, the internal pull-up resistor on the
LIN pin can be disconnected by clearing the LINPE bit in the
Mode Control Register (MCR). The LINPE bit also changes
the Bus wake-up threshold (VBUSWU).
This feature will reduce the current consumption in STOP
and SLEEP Modes. It also improves performance and safe
operation.
33912
Analog Integrated Circuit Device Data
Freescale Semiconductor
32
FREESCALE [ Freescale ]
