MC33690 Datasheet, PDF (9/24 Pages) Motorola, Inc – Standalone Tag Reader Circuit

Freescale S^Me^Cm³³i⁶c⁹o⁰nductor, Inc.
COMMUNICATION MODES DESCRIPTION
The STARC offers 3 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.
Table 1. Communication modes description
Configuration
Type
Bus type
Name
Configuration
pins
Mode1 Mode2
Pin status
& function description
K output/input :
- demodulator output,
1 wire
(VBAT)
A
0
0
- amplitude modulation input
- shutdown/wake-up
AM must be connected to VSUP
Standalone
DOUT forces a low level
K output :
- demodulator output
2 wires
(VBAT)
B
0
1
AM input :
- amplitude modulation input,
- shutdown/wake-up
DOUT forces a low level
DOUT output :
- demodulator output
x
AM input :
- amplitude modulation input
MODE2 input :
Direct
connection
to a MCU
2 wires
(VDD)
C
1
- shutdown/wake-up
K output/input (standalone ISO 9141 inter-
1
face) :
- driven by Tx and monitored by Rx
K input (standalone ISO 9141 interface) :
0
- monitored by Rx
-Tx disabled
© Motorola, Inc., 2002.
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revision 4.8, 5 February 2002