H4001 Datasheet, PDF (4/5 Pages) EM Microelectronic - MARIN SA – READ-ONLY CONTACTLESS IDENTIFICATION DEVICE

®
EM MICROELECTRONIC-MARIN SA
Block Diagram
H4001
COIL_1
COIL_2
AC1
FULL WAVE
RECTIFIER
AC2
CLOCK
EXTRACTOR
Logic
Clock
SEQUENCER
MEMORY
ARRAY
DATA
MODULATOR
Serial
Data out
Modulation
Control
Functional Description
DATA
ENCODER
Fig. 6
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
1
1
1
11
- 9 Bits Header
8 Version bits or
Customer ID
D00 D01 D02 D03 P0
D10 D11 D12 D13 P1
D20 D21 D22 D23 P2
- 4 data bits & associated even row parity bit
D30 D31 D32 D33 P3
32 Data Bits
allowing 4 billion
of combinations
D40 D41 D42 D43 P4
D50 D51 D52 D53 P5
D60 D61 D62 D63 P6
D70 D71 D72 D73 P7
D80 D81 D82 D83 P8
D90 D91 D92 D93 P9
PC0 PC1 PC2 PC3 0
- 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