 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
EM4022V11WS11 Datasheet(PDF) 8 Page - EM Microelectronic - MARIN SA |
|
||||||||||||||||||||||||||||||
EM4022V11WS11 Datasheet(HTML) 8 Page - EM Microelectronic - MARIN SA |
|
|
8 / 15 page  Copyright 2002, EM Microelectronic-Marin SA 8 www.emmicroelectronic.com EM4022 Data Encoder The transmitted code always consists of an 11 bit preamble followed by the 64 code bits. The preamble consists of 8 start bits (ZEROES), followed by a SYNCH. The SYNCH consists of a LOW for two bit periods followed by a ONE. The EM4022 can be programmed for one of two data encoding methods. The first method is a variation on Manchester II, i.e. a ONE is represented by a HIGH in the first half of a bit period, and a ZERO is represented by a LOW in the first half of a bit period. The second encoding method is called GLITCH encoding. A ONE is represented by a HIGH in the first quarter of the bit period, while a ZERO is represented by a HIGH in the third quarter of the bit period. In GLITCH encoding the longest modulation period is one quarter of a bit period, compared to the Manchester encoding, where the longest modulation period is one full bit period. GLITCH encoding therefore requires a much smaller power storage capacitor. Data Encoding Fig. 8 ROM programming The EM4022 contains three laser fuse ROM blocks that are pre-programmed by the foundry. CODE ID ROM This ROM contains the 64 bit ID code. The foundry will automatically program a unique 48 bit ID and 16 bit CRC. In this case the most significant bit of the ID is programmed into bit 0 of the ROM, which will be transmitted first. CONTROL ROM The operational modes of the EM4022 are pre- programmed into the CONTROL ROM. The contents of this one is not read out. CRC Block Diagram CRC-CCITT Generating polynomial = X15 + X2 + X0 Fig.9 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 X X15 MSB X2 LSB X0 Exclusive OR Shift Register Data Input Feedback before shift "0""0""1" |
Similar Part No. - EM4022V11WS11 |
|
Similar Description - EM4022V11WS11 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
