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參數(shù)資料
| 型號： | EM4022V18WS11 |
| 英文描述： | 5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller; Temperature Range: 0°C to 70°C; Package: 8-SOIC |
| 中文描述： | 模擬雜項 |
| 文件頁數(shù)： | 14/15頁 |
| 文件大?。?/td> | 277K |
| 代理商： | EM4022V18WS11 |
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"
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PDF描述 |
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| EM4022V19WS11 | 5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller; Temperature Range: 0°C to 70°C; Package: 10-DFN |
| EM4022V20WS11 | 5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller; Temperature Range: -40°C to 85°C; Package: 8-SOIC |
| EM4022V21WS11 | 5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller; Temperature Range: -40°C to 85°C; Package: 10-DFN |
| EM4022V10WS11 | Single-Phase Buck PWM Controller with Integrated High Speed MOSFET Driver and Pre-Biased Load Capability; Temperature Range: -40°C to 85°C; Package: 28-QFN |
| EM4022V11WS11 | Analog Miscellaneous |
相關代理商/技術參數(shù) |
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|---|---|
| EM4022V19WS11 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Multi Frequency Contactless Identification Device Anti-Collision compatible with BTG Supertag Category Protocols |
| EM4022V20WS11 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Multi Frequency Contactless Identification Device Anti-Collision compatible with BTG Supertag Category Protocols |
| EM4022V21WS11 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Multi Frequency Contactless Identification Device Anti-Collision compatible with BTG Supertag Category Protocols |
| EM4025 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Read Only Contactless Identification Device with Anticollision |
| EM4026 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Read only Contactless Identification Device |
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