SA7120A: 128 Bit Read-only Biphase Coded Transponder
for ISO 11784 / 11785 FDX-B (Full Duplex) Application
FEATURES
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EEPROM flexibility of data configuration
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On-chip resonance capacitor
128 bits of OTP data factory programmed and locked § No external charge storage capacitor required
Customer specific configuration of stored data
Data output in Biphase mode
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On-chip full wave rectifier
On-chip data modulator
Biphase data readout conforming to ISO 11784 / 11785 § On-chip high voltage protection / regulation
FDX-B full duplex
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On-chip RF frequency clock extractor / prescaler
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Carrier frequency 100 to 300 kHz
Low power dissipation
DESCRIPTION
Data is read at the RF interface by means of the on-chip
modulator. The stored bits are clocked out sequentially
during the read operation. An internal power-on reset is
provided which allows the device to start reading out data at
low voltages for improved tag range.
This device is manufactured in the SAMES 1.2µm N-well
EEPROM process. It has 128 bits, factory pre-programmed
and locked in EEPROM memory. Read data is Biphase
coded.
The device has an on-chip rectification circuit that converts
APPLICATIONS
the incoming rf signal to DC power feeding V . There is
DD
also an on-chip data modulator which works in conjunction
with the rectifier. The time base is extracted by an on-chip
RF clock extractor. High voltage protection across the coil
inputs is provided internally. The energy is stored on
capacitance on chip due to low internal power consumption.
The device has an on-chip resonance capacitor connected
between the COIL1 and COIL2 pads. These features result
in a single external component count, comprised of, only the
coil.
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Animal ID ear tag
Animal ID bolus tag
Industrial automation
Asset tracking
SPEC—1123 (REV. 1)
21-05-03
1/10
http://www.sames.co.za