R
EM4150
EM4350
Electrical Characteristics
VDD = 2.5V, VSS = 0V, fcoil = 125 kHz Sine wave, Vcoil = 1Vpp, Top = 25°C unless otherwise stated
Parameter
Symbol Test Conditions
Min
2.0
2.6
Typ
Max
Units
Supply voltage
VDD
5.5
V
V
Minimum EEPROM write
voltage
VDDee
Power Check EEPROM write
Supply current / read
IPWcheck
Ird
VDD = 3V
80
5.0
µA
µA
Read Mode
3.0
40
Suppy current / write
Iwr
Write mode (VDD = 3V)
70
µA
Modulator ON voltage drop
VON
0.50
2.50
173.5
2.6
V
V(COIL1–Vss) and V(COIL2-Vss) Icoil = 100µA
V(COIL1–Vss) and V(COIL2-Vss) Icoil = 5mA
V
Resonance Capacitor
Cr
Vprh
166.5
1.0
170
2.0
pF
Power On Reset level high
Clock extractor input min.
Clock extractor input max.
EEPROM data endurance
EEPROM retention
Rising Supply
V
Vclkmin
Vclkmax
Ncy
Minimum voltage for Clock Extraction
Maximum voltage to detect modulation stop
Erase all / Write all at VDD = 5V
Top = 55°C after 100'000 cycles (Note 1)
Vpp
mVpp
cycles
years
50
100'000
10
Tret
Note 1: Based on 1000 hours at 150°C
Timing Characteristics
VDD = 2.5V, VSS = 0V, fcoil = 125 kHz Sine wave, Vcoil = 1Vpp, Top = 25°C unless otherwise stated
All timings are derived from the field frequency and are specified as a number of RF periods.
Parameters
Symbol
Test conditions
Value
Units
Option : 64 clocks per bit
Opt64
Read Bit Period
trdb
tpatt
trdw
tpp
twa
tinit
64
320
3200
64
64
2112
3200
RF periods
RF periods
RF periods
RF periods
RF periods
RF periods
RF periods
LIW/ACK/NACK pattern Duration
Read 1 Word Duration
Processing Pause Time
Write Access Time
Initialization Time
EEPROM write time
including LIW
VDD = 3 V
twee
Option : 32 clocks per bit
Opt32
Read Bit Period
trdb
tpatt
trdw
tpp
twa
tinit
32
160
1600
32
32
1056
2624
RF periods
RF periods
RF periods
RF periods
RF periods
RF periods
RF periods
LIW/ACK/NACK pattern Duration
Read 1 Word Duration
Processing Pause Time
Write Access Time
Initialization Time
EEPROM write time
including LIW
VDD = 3 V
twee
RF periods represent periods of the carrier frequency emitted by the transciever unit. For example, if 125 kHz is used :
The Read bit period (Opt64) would be : 1/125'000*64 = 512 µs, and the time to read 1 word : 1/125'000*3200 = 25.6 ms.
The Read bit period (Opt32) would be : 1/125'000*32 = 256 µs, and the time to read 1 word : 1/125'000*1600 = 12.8 ms.
ATTENTION
Due to amplitude modulation of the coil-signal, the clock-extractor may miss clocks or add spurious clocks close
to the edges of the RF-envelope. This desynchronisation will not be larger than ±3 clocks per bit and must be
taken into account when developing reader software.
3
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