L9918 datasheet(31/109 Pages) STMICROELECTRONICS

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Communication terminal - LIN pin

The communication interface implemented in L9918 LIN regulator is compliant with the data link layer

specification 1.3, 2.1, 2.2 and 2.2 A. Data exchange via the serial bidirectional bus uses master-slave principle;

engine/energy management unit (ECU) is the master and L9918 is the slave.

Lin Slave implemented in L9918 will be able to communicate with following masters:

•

LIN Master 1.3

•

LIN Master 2.1

•

LIN Master 2.2

•

LIN Master 2.2 A

The regulator is certified to be compliant to:

•

Physical layer compliance with LIN specification 2.2 A. This ensures the possibility for L9918 to

communicate with devices compliant with prior LIN Physical Layer specifications.

•

Data link layer compliance with LIN specification 1.3, 2.1, 2.2 and 2.2 A.

•

Tests defined by LIN Conformance Test Specification Package for LIN 2.2

Hardware Requirements for LIN, CAN and FlexRay Interfaces in Automotive Application – VDA – Revision

1.3 / 2012

Protocol effectively used during the product life is selected by customer by NVM bits (LIN_MODE,

LIN_WAKEUP_PATTERN, LIN21_SOFTID_DIS).

LIN communication addresses two different needs for the device: ECU communication during the product life

into the brush holder and communication with LIN master for NVM bits programming. In this last case the LIN

master is typically represented by a PC and the NVM programming of the device programming registers (listed

into Section A.1 NVM parameters table) is typically done at EOL, one time only.

5.1

LIN Physical layer

Physical layer parameters not listed here are implemented according to the LIN2.1 specification

Symbol

Parameter

Notes

Min.

Typ.

Max.

Unit

VLINRange

Operating voltage range

Rpu

Internal pull-up resistor (LIN slave)

kΩ

CSlave

Parasitic LIN capacitance

100

120

ILIN_lim

Current limitation

Dominant state,

VB+ = 18 V,Parameter tested while

device is transmitting

200

ILIN_PAS_dom

Input leakage current

VLIN = 0 V, VB+ = 12 V,Dominant

state, parameter tested while

device is not transmitting

-1

-0.3

ILIN_PAS_rec

Input leakage current

Recessive state,8 V < VLIN < 18 V

8 V < VB+ < 18 V VLIN > VB+

-20

μA

ILIN_NO_GND

Input current if GND is lost

GND disconnected;

GND = VB+ = 12 V;

VLIN = 0 .. 18 V

-1

ILIN_NO_B+

Input current if B+ is lost

B+ disconnected;

GND = VB+ = 0 V;

VLIN = 0 .. 18 V

100

μA

Vth_dom

Receiver threshold voltage recessive to

dominant state

0.4 * B+

0.45 * B+

0.5 * B+

L9918

Communication terminal - LIN pin

DS13000 - Rev 2

page 31/109

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