MC33690DWE Freescale Semiconductor, MC33690DWE Datasheet - Page 10

• Manufacturer Part Number: MC33690DWE
• Description: IC STAND ALONE TAG READER 20SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MC33690DWE

• Rf Type: Read / Write
• Frequency: 125kHz
• Features: Wide Supply Voltage Range
• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Standalone Configuration with One-Wire Bus
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When a low level is applied on pins MODE1 and MODE2, the circuit is in configuration A (see
circuit is set into read mode. The demodulator output is directly routed to the ISO 9141 interface output K.
The circuit can be set into write mode at anytime by violation of all possible patterns on the single wire bus during more than
1ms. Then, the K line achieves the amplitude modulation by switching on/off both antenna drivers.
After 1ms of inactivity at the end of the challenge phase (bus in idle recessive one state), the circuit is set back into read mode.
The circuit can be put into standby mode by forcing the K line at zero during more than 2 ms after entering the write mode.
After the K line is released, the circuit sends an acknowledge pulse before entering into standby mode. In standby mode, the
oscillator and most of the internal biasing currents are switched off. Therefore, the functions (tag reader, ISO 9141 driver) are
inactive except the voltage regulator and the ISO 9141 receiver on pin K. The driver output TD1 forces a low level and TD2
forces a high level. A rising edge on K wakes up the circuit. After completion of the wake-up sequence, the circuit is
automatically set in read mode.
In configuration A, DOUT and Rx outputs always force a low level and Tx is disabled.
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Connection to
Standalone
a MCU
Direct
Type
Standalone Configuration with One-Wire Bus
Configuration
2 wires (VBAT)
2 wires (VDD)
1 wire (VBAT)
Bus Type
Table 4. Communication Modes Description
MC33690 Standalone Tag Reader Circuit, Rev. 5
Name
A
B
C
Configuration Pins
Mode1
0
0
1
Mode2
0
1
x
1
0
K output/input:
AM must be connected to VSUP
DOUT forces a low level
K output:
AM input:
DOUT forces a low level
DOUT output:
AM input:
MODE2 input:
K output/input (standalone ISO 9141 interface):
K input (standalone ISO 9141 interface):
• demodulator output
• amplitude modulation input
• shutdown/wake-up
• demodulator output
• amplitude modulation input
• shutdown/wake-up
• demodulator output
• amplitude modulation input
• shutdown/wake-up
• driven by Tx and monitored by Rx
• monitored by Rx
• Tx disabled
Pin Status Function Description
Figure
Freescale Semiconductor
24). After power on, the