Communication Modes Description
VDD
AM data
From configuration controller
VDD
Rx
From configuration controller
Tag reader module output
VDD
Tx
VSUP
2kW
GND
VSUP
2.5mA
GND
2kW
L line
AM
Over temperature
detector
2.5mA
GND
GND
Command
VBAT
K line
K
Current limitation
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.
MC33690 Standalone Tag Reader Circuit, Rev. 5
Freescale Semiconductor
9