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ELM408 PDF预览

ELM408

更新时间: 2024-11-05 11:46:03
品牌 Logo 应用领域
ELM 解码器
页数 文件大小 规格书
10页 57K
描述
Rotary Decoder - 2 wire Interface

ELM408 数据手册

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ELM408  
Rotary Decoder - 2 wire Interface  
Description  
Features  
The ELM408 is an 8 pin integrated circuit that is  
• Low power CMOS design  
used to convert the output from a rotary encoder into  
two signals (chip select, and up/down) that can be  
used to control various devices. The low power  
CMOS technology used ensures that only a very  
small current is required over the entire 2.0 to 5.5  
volt operating range.  
• Wide supply range – 2.0 to 5.5 volts  
• Complete debouncing of the encoder inputs  
• No external filtering needed  
• 2x and 4x decoding  
• Can generate a write sequence  
• Startup delay timer  
There is no need for external filtering or  
debounce circuits with the ELM408, as this is all  
performed within the integrated circuit. After  
debouncing the encoder signals, the ELM408  
determines the direction of shaft rotation, and then  
generates the appropriate outputs. A write sequence  
can also be generated if the Write Enable input is at  
a high level when the outputs are generated.  
• High current drive outputs  
Connection Diagram  
PDIP and SOIC  
(top view)  
The ELM408 provides both 2x and 4x decoding  
of a rotary encoder signal. See the Output  
Waveforms section for more information.  
1
2
3
4
8
7
6
5
VDD  
A
VSS  
Applications  
CS  
B
U/D  
4x/2x  
• Digital audio potentiometer controls  
• Variable voltage or temperature circuits  
• Positioning controls  
Write  
Enable  
• Tuning circuits  
Block Diagram  
VDD  
A
Debounce  
2
Circuit  
7
6
CS  
Direction  
Decoding  
Output  
Logic  
VDD  
B
U/D  
Debounce  
3
Circuit  
Rotary  
Encoder  
4
5
Write  
Enable  
4x/2x  
ELM408DSA  
Elm Electronics – Circuits for the Hobbyist  
1 of 10  
www.elmelectronics.com  

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