MEM Key - programmable keypad encoder
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A fully programmable matrix keypad encoder
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- 4X5 Matrix Programmable Rows and Columns
- Programmable key values
- PC/AT or serial output
- Automatic or polled key reporting
- Programmable debounce and typematic times
- 64 Bytes of user-accessible EEPROM
- Standard TTL levels
- No external components
- Easy-to-use SIP package
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The MEM Key is a fully programmable keypad encoder. Using a jumper, the
MEM Key supports either a simple serial communication protocol or the standard
PC/AT communication protocol. In either communication mode, it can decode
key matrixes of up to 4 columns by 5 rows. The rows and columns can be programmed
to match the row-column configuration of any off the shelf keypad.
The value returned by the MEM Key can be programmed to any standard value.
The debounce time and typematic rate are fully programmable. All programmable
values are stored in non-volatile memory so they are saved when power is
off.
When operating with the serial protocol, the MEM Key communicates at
2400 baud, 8N1, LSB first, asynchronous. This can be either a 1 wire or
a 2 wire interface.
In addition, there are 64 bytes of EEPROM memory which is made available
to the user as scratch pad space.
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16x2 Serial LCD
