Communication Modes Description

MC33690 Standalone Tag Reader Circuit, Rev. 5

Freescale Semiconductor

9

Figure 5. ISO 9141 Interface

6

Communication Modes Description

The STARC offers three different communication modes. Therefore, it can be used as a standalone circuit connected to an

electronic control unit (ECU) through a bus line or it can be directly connected to a microcontroller in case of a single board

architecture.

Command

Rx

K

Tx

K line

VBAT

2kW

Over temperature

Current limitation

detector

VDD

VDD

Tag reader module output

AM

VSUP

From configuration controller

AM data

From configuration controller

L line

VSUP

VDD

GND

2.5mA

GND

2.5mA

2kW

GND

GND