MM908E624ACEWSLASHR2 datasheet(26/40 Pages) FREESCALE

26 / 40 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

908E624

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

Figure 15. LIN Interface

TXD Terminal

The TXD terminal is the MCU interface to control the state

of the LIN transmitter (see Figure 2, page 2). When TXD is

LOW, the LIN terminal is low (dominant state). When TXD is

HIGH, the LIN output MOSFET is turned off (recessive state).

The TXD terminal has an internal pullup current source in

order to set the LIN bus to recessive state in the event, for

instance, the microcontroller could not control it during

system power-up or power-down.

RXD Terminal

The RXD transceiver terminal is the MCU interface, which

reports the state of the LIN bus voltage. LIN HIGH (recessive

state) is reported by a high level on RXD, LIN LOW (dominant

state) by a low level on RXD.

STOP Mode and Wake-up Feature

During STOP mode operation the transmitter of the

physical layer is disabled. In case the bit LIN-PU was set in

the Stop mode sequence the internal pull-up resistor is

disconnected from VSUP and a small current source keeps

the LIN terminal in recessive state. The receiver is still active

and able to detect wake-up events on the LIN bus line.

A dominant level longer than TpropWL followed by an rising

edge will generate a wake-up interrupt and set the LINWF

flag in the SPI Status Register. Also see Figure 9, page 16.

SLEEP Mode and Wake-up Feature

During SLEEP mode operation the transmitter of the

physical layer is disabled. In case the bit LIN-PU was set in

the Sleep mode sequence the internal pull-up resistor is

disconnected from VSUP and a small current source keeps

the LIN terminal in recessive state. The receiver is still active

to be able to detect wake-up events on the LIN bus line.

A dominant level longer than TpropWL followed by an rising

edge will generate a system wake-up (reset) and set the

LINWF flag in the SPI Status Register. Also see Figure 8,

page 16).

Control

RXD

TXD

GND

VSUP1

Slope

Control

30k

2µA

LIN bus

LINSL2:1

MODE2:1

LINFAIL

LINWU

WakeUp

Filter

LIN-PU

MM908E624ACEW/R2 Datasheet(PDF) 26 Page - Freescale Semiconductor, Inc

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