Description

The EM4102 (previously named is a CMOS integrated circuit for use in electronic Read Only RF Transponders. The circuit is powered by an external coil placed in an electromagnetic field, and gets its master clock from the same field via one of the coil terminals. By turning on and off the modulation current, the chip will send back the 64 bits of information contained in a factor programmed memory array. The programming of the chip is performed by laser fusing of polysilicon links in order to store a unique code on each chip. The EM4102 has several metal options which are used to define the code type and data rate. Data rates 64, 32 and 16 periods of carrier frequency per data bit are available. Data can be coded as Manchester, Biphase or PSK. Due to low power consumption of the logic core, no supply buffer capacitor is required. Only an external coil is needed to obtain the chip function. A parallel resonance capacitor pF is also integrated.

Features

64 bit memory array laser programmable Several options of data rate and coding available On chip resonance capacitor On chip supply buffer capacitor On chip voltage limiter Full wave rectifier on chip Large modulation depth due to a low impedance modulation device Operating frequency – 150 kHz Very small chip size convenient for implantation Very low power consumption

Applications
Animal implantable transponder Animal ear tag Industrial transponder
Coil terminal / Clock input Coil terminal Fig. 2

Parameter Maximum DC Current forced & COIL2 Power Supply Storage Temp. Die form Storage Temp. PCB form Electrostatic discharge maximum to MIL-STD-883C method 3015 Symbol ICOIL Conditions ±30mA

This device has built-in protection against high static voltages or electric fields; however, anti-static precautions must be taken as for any other CMOS component. Unless otherwise specified, proper operation can only occur when all terminal voltages are kept within the voltage range. Unused inputs must always be tied to a defined logic voltage level.

Parameter Operating Temp. Maximum Coil Current Symbol Min Top -40 ICOIL Vcoil fcoil Typ Max Units 10 mA Vpp kHz

Stresses above these listed maximum ratings may cause permanent damages to the device. Exposure beyond specified operating conditions may affect device reliability or cause malfunction.

The AC Voltage on Coil is limited by the on chip voltage limitation circuitry. This is according to the parameter Icoil in the absolute maximum ratings.

VDD = 1.5V, VSS = 134kHz square wave, = 1.0V with positive peak at VDD and negative peak at VDD -1V unless otherwise specified

Supply Voltage Rectified Supply Voltage – Coil2 Capacitance Power Supply Capacitor Manchester and biphase versions Supply Current C2 pad Modulator ON voltage drop PSK version Supply Current C2 pad Modulator ON voltage drop

VDD VDDREC Cres Csup = 2.8 VDC Modulator switch = “ON” Vcoil=100mVRMS f=10kHz

The maximum voltage is defined by forcing – COIL2 The tolerance of the resonant capacitor ± 15% over the whole production. On a wafer basis, the tolerance ± 2%

VDD = 1.5V, VSS = 0V, fcoil = 134kHz square wave, = 1.0V with positive peak at VDD and negative peak at VDD -1V unless otherwise specified Timings are derived from the field frequency and are specified as a number of RF periods.