参数资料
型号: MC34911G5AC
厂商: Freescale Semiconductor
文件页数: 77/92页
文件大小: 0K
描述: IC SYSTEM BASIS CHIP LIN 32-LQFP
标准包装: 250
应用: 系统基础芯片
电流 - 电源: 4.5mA
电源电压: 5.5 V ~ 27 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-LQFP
供应商设备封装: 32-LQFP(7x7)
包装: 托盘
MC33911BAC / MC34911BAC
FUNCTIONAL DEVICE OPERATIONS
OPERATIONAL MODES
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
? Over-temperature shutdown
? LIN pull-up disable in Stop and Sleep modes
? Advanced diagnostics
? LIN dominant voltage level selection
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 Pin
The LIN pin offers a high susceptibility immunity level from
external disturbance, guaranteeing communication.
INTERRUPT
CONTROL
MODULE
WAKE-UP
MODULE
MOD1:2
High-voltage
Shutdown
High Side
Interrupt
LIN
Wake-up
LSR0:1
LINPE
LDVS
RXONLY
RXSHORT
LIN – DRIVER
Slope and Slew Rate Control
Over-current Shutdown (interrupt maskable)
Over-temperature Shutdown (interrupt maskable)
VS1
TXDOM
LINOT
LINOC
30K
LIN
TXD
WAKE-UP
SLOPE
CONTROL
LGND
FILTER
RXD
RECEIVER
Figure 42. LIN Interface
Slew Rate Selection
The slew rate can be selected for optimized operation at 10.4
and 20 kBit/s as well as a fast baud rate for test and
programming. The slew rate can be adapted with the LSR1:0
bits in the LIN Control Register (LINCR). The initial slew rate
is optimized for 20 kBit/s.
LIN Pull-up Disable In Stop And Sleep Modes
In case 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 bit LINPE also changes the Bus
wake-up threshold ( V BUSWU ).
This feature will reduce the current consumption in STOP and
SLEEP modes. It also improves performance and safe
operation.
Current Limit (LIN Interrupt)
The output low side FET is protected against over-current
conditions. If an over-current condition occurs (e.g. LIN bus
short to V BAT ), the transmitter will not be shut down. The bit
LINOC in the LIN Status Register (LINSR) is set.
33911
Analog Integrated Circuit Device Data ?
77
Freescale Semiconductor
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