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Features
64 bit memory array laser programmable Wide dynamic range due to on chip buffer capacitance & voltage limiter on chip. Full wave rectifier on chip Big modulation depth due to a low impedance modulation device 50'000 baud reading speed at 3 MHz Very small chip size convenient for implantation Unsensitive close to metal Large distance even without resonance capacitor No external buffer capacitance needed due to low power consumption
EM MICROELECTRONIC-MARIN SA
H4001
READ-ONLY CONTACTLESS IDENTIFICATION DEVICE
Typical Operating Configuration
COIL 1
L
C
H4001
COIL 2
Description
The H4001 is a CMOS integrated circuit for use in transponders. The circuit is powered by an external coil placed in a magnetic field, and gets its clock from the same field via one of the coil terminals. The other coil terminal is affected by the modulator, turning on and off the modulation current in order to send back the 64 bits of information contained in a factory pre-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 serial output data string contains a 9 bits header, 40 bits of data, 14 parity bits, and 1 stop bit.
COIL 2
Typical value of inductance at 125 KHz is 2 mH The capacitor is adjusted to the resonance
Fig. 1
Pin Assignment
Due to the low power consumption of the logic core, no supply buffer capacitor is required. Only an external coil is required to obtain the chip function. A parallel capacitor adjusted with the coil to obtain resonnance, will increase the read distance.
COIL 1
Applications
Industrial transponder Animal transponder ID Cards Serial Number Identification ROM
COIL 1 COIL 2 coil terminal/ clock input coil terminal/ data transmisssion
Fig. 2
1
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Absolute Maximum Ratings
Parameter Maximum AC peak current induced on COIL1 and COIL2
Maximum storage temperature Tstoremax Minimum storage temperature Tstoremin Electrostatic discharge maximum to MIL-STD-883C method 3015 VESD
EM MICROELECTRONIC-MARIN SA
Symbol Condition Icoil 30 mA +200 C - 55 C 750 V
H4001
Handling Procedures
This device has built-in protection against high static voltages or electric fields; however, due to the unique properties of this device, anti-static precautions should be taken as for any other CMOS component. Unless otherwise specified proper operation can only occur when all terminal voltages are kept within the supply voltage range. Unused inputs must always be tied to a defined logic voltage level.
Table 1 Stresses above these listed maximum ratings may cause permanent damage to the device. Exposure beyond specified operating conditions may affect device reliability or cause malfunction.
Operating Conditions
Parameter
Operating Temperature AC Supply Voltage Supply Frequency
Symbol Min Typ Max Unit
TA Vcoil fcoil -40 3.5 50 130 400 +85 C Vpp KHz
Table 2
Electrical Characteristics
Vcoil = 3.5Vpp 5% Parameter Demodulated Voltage fcoil =130KHz Sine Wave Symbol Udemod
U COIL
TA = 25C unless otherwise specified Min
1N4148 U DEMOD
Test Conditions
10 K LM310 COIL1 R COIL2 10 nF
Typ.
Max
Unit VAC
0.25
U COIL = 3.5 Vpp
Manchester : R = 3 K PSK : R = 820
Dynamic Current
Idyn
50
A Table 3
Timing Characteristics
VCOIL2 = 0V VCOIL1 = 3.5Vpp Sine Wave Parameter Coil Clock frequency Ratio between coil period and bit period Manchester code PSK Symbol fCOIL Rmch Rpsk Min 50 Typ 130 Max 400 Unit kHz
64 16 Table 4
2
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Timing Waveforms
COIL1
EM MICROELECTRONIC-MARIN SA
Manchester coded : 64 T OC T OC PSK version : 16 T OC BIT n BIT n+1
H4001
Serial Data Out
BIT n+2
Fig. 3
Manchester coded version
Bit Number 1 2 3 4 5 6 7 8 9 10 11 12 62 63 64 1 2 3
Serial Data Out
Modulation Control
Fig. 4
MODULATION CONTROL "LOW" MEANS HIGH CURRENT ON COIL2
PSK version
Serial Data Out
COIL1
Modulation Control
"0" ON SERIAL OUT
"1" ON SERIAL OUT
Fig. 5
3
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Block Diagram
COIL_1
EM MICROELECTRONIC-MARIN SA
CLOCK EXTRACTOR Logic Clock AC1 FULL WAVE RECTIFIER AC2 SEQUENCER
H4001
MEMORY ARRAY
COIL_2
DATA MODULATOR
Serial Data out
Modulation Control
DATA ENCODER
Fig. 6
Functional Description
Full Wave Rectifier The AC input induced in the external coil by an incident magnetic field is rectified by a Graetz bridge Memory Array The H4001 contains 64 bits divided in five groups of information. 9 bits are used for the header, 10 row parity bits (P0 - P9), 4 column parity bits (PC0 - PC3), 40 data bits (D00 - D93), and 1 stop bit set to logic 0.
1 1 1 1 8 Version bits or Customer ID 1 D00 D10 D20 D30 D40 D50 D60 D70 D80 D90 PC0 1 D01 D11 D21 D31 D41 D51 D61 D71 D81 D91 PC1 1 D02 D12 D22 D32 D42 D52 D62 D72 D82 D92 PC2 1 D03 D13 D23 D33 D43 D53 D63 D73 D83 D93 PC3 1 P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 0 - 9 Bits Header - 4 data bits & associated even row parity bit
32 Data Bits allowing 4 billion of combinations
- 4 column even parity bits, NO row parity bit
The header is composed by the 9 first bits which are mask programmed to 111111111. Due to the data and parity organisation, this sequence can not be reproduced in the data string. The header is followed by 10 groups of 4 data bits and 1 even row parity bit. Then, the last group consists of 4 even column parity bits without row parity bit. Bits D00 to D03 and bits D10 to D13 are customer specific identification. These 64 bits are outputted serially in order to control the modulator used to modify the current at one of the coil terminals. When the 64 bits data string is outputted, the output sequence is repeated continuously until power goes off.
4
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Control Logic
Two mask programmed versions of logic are available. The first one will modulate the amplitude of the magnetic field with a bit rate corresponding to 64 periods of the field frequency (Manchester coding). The second version is using half of the field frequency to transmit data by shifting the signal phase (PSK coding). One of the coil terminals (COIL1 in Fig.6) is used to generate the clock signal for the logic. The output of the clock extractor drives a sequencer providing all necessary signals to address the Memory Array, and serially output the data.
EM MICROELECTRONIC-MARIN SA
H4001
PSK version The serial data output of the Memory array connects the modulation control to the output or inverted output of a flip-flop which input is the signal from the clock extractor. When a logic 0 is output, the modulation control signal is changed to the other output of the flip-flop, and when a logic 1 is output, the modulation control signal remains on the same flip-flop output.
Data Modulator The data modulator is controlled by the signal Modulation Control (see above fig. 4 & 5) in order to induce a high current on COIL_2 terminal when this signal is at logic 0. This will affect the magnetic field according to the data stored in the Memory Array.
Package Information
PCB
4.0 mm 1.0 mm
DIP 8 / SO8 COIL2
8.0 mm
COIL1
1206
H4001
EM
*
* Max. thickness depending on utilized capacitor
Fig. 7
Ordering Information The H4001 is available in the following packages DIP 8-pin package H4001 8P SO 8-pin package H4001 8S PCB 2 connections H4001 PCB Chip form and others on request
EM Microelectronic-Marin SA cannot assume responsibility for use of any circuitry described other than circuitry entirely embodied in an EM Microelectronic-Marin SA product. EM Microelectronic-Marin SA reserves the right to change the circuitry and specifications without notice at any time. You are strongly urged to ensure that the information given has not been superseded by a more up-to-date version. (c) 1996 EM Microelectronic-Marin SA 3/96 Rev. E/127
EM Microelectronic-Marin SA
CH-2074 Marin, Switzerland,Tel. +41 32 755 51 11, Fax +41 32 755 54 03
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