AMIS-40616

Data Sheet

LIN Transceiver with 5V Voltage Regulator

7.0 Functional Description

7.1 Overall Functional Description

LIN is a serial communication protocol that efficiently supports the control of mechatronic nodes in distributed automotive applications.

The domain is class-A multiplex buses with a single master node and a set of slave nodes.

AMIS-40616 is designed as a master or slave node for the LIN communication interface with integrated 5V voltage regulator having a

current capability up to 50mA for supplying any external components (microcontroller).

AMIS-40616 contains the LIN transmitter, LIN receiver, voltage regulator, power-on-reset (POR) circuits and thermal shutdown (TSD).

The LIN transmitter is optimized for the maximum specified transmission speed of 20kBaud with EMC performance due to reduced slew

rate of the LIN output.

The junction temperature is monitored via a thermal shutdown circuit that switches the LIN transmitter and voltage regulator off when

temperature exceeds the TSD trigger level.

AMIS-40616 has four operating states (normal mode, low slope mode, stand-by mode, and sleep mode) that are determined by the

input signals EN, WAKE, STB, and TxD.

7.2 Operating States

AMIS-40616 provides four operating states, two modes for normal operation with communication, one stand-by without communication

and one low power mode with very low current consumption. See Figure 4.

Stand-by mode

- Vcc: “on”

- LIN TX: “off”

- INH: “floating”

- Term: “current source”

”

- RxD: high/low

Normal mode

(normal slope)

- Vcc: “on”

- LIN TX: “on”

- INH: “high”/”floating”

- Term: 30k Ω

- RxD: LIN data

Normal mode

(low slope)

- Vcc: “on”

- LIN TX: “on”

- INH: “high”/”floating”

- Term: 30k Ω

- RxD: LIN data

Sleep mode

- Vcc: “off”

- LIN TX: “off”

- INH: “floating”

- Term: “current source”

- RxD: =VCC

EN goes from 1 to 0 while STB = 1

EN goes from 0 to 1 while TxD = 1

EN goes from 1 to 0 while STB = 0

Power up Vbb

Local wake-up

or LIN wake-up

Figure 4: State Diagram

6

AMI Semiconductor – January 2007, M-20545-001

www.amis.com