U2270B_08 Datasheet, PDF (2/18 Pages) ATMEL Corporation – Read/Write Base Station

Figure 1-1. System Block Diagram
Transponder/TAG
Transponder
IC
RF field
typ. 125 kHz
Figure 1-2. Block Diagram
DV_S V_EXT
Read/write base station
Osc
U2270B
NF read channel
Carrier
enable
Data
output
MCU
Unlock
System
V_S
V_Batt
COIL1
Power supply
=1
COIL2
DGND
Driver
Input
Lowpass filter
Amplifier
HIPASS
&
Oscillator
&
Schmitt trigger
GND
OE
Standby
Frequency
adjustment
MS
CFE
RF
Output
2 U2270B
4684E–RFID–02/08