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參數(shù)資料
| 型號： | EKK6111 |
| 英文描述： | QFN Packaged, ±15kV ESD Protected, +3V to +5.5V, 300nA, 250kbps, RS-232 Transceivers with Enhanced Automatic Powerdown and a Separate Logic Supply; Temperature Range: -40°C to 85°C; Package: 32-QFN |
| 中文描述： | 的PS / 2鍵盤射頻接收器 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大小： | 1084K |
| 代理商： | EKK6111 |
eKK6111
RF KEYBOARD DECODER
Preliminary
Decoder data output
When the decoder is ready to send data to the system, it first checks clock and data lines. If either one is in the
low state, data is stored in the buffer. If both are in the high state, decoder starts clocking data out. Data will be valid
before the trailing edge and after the leading edge of the clock pulse. During the transmissions the decoder checks the
clock line at least 60 microseconds. If the system lowers the clock lines before leading edge of the 10
th clock, the
decoder should stop sending, then buffer the data and return clock and data to high state.
Decoder data input
When the system is ready to send data to the decoder, it first checks line to see if decoder is sending data. If
decoder is not sending data or it is sending data but has not reached the 10
th clock, the system can inhibit the interface
by forcing the clock line low for more than 60 microseconds and prepares to send data. The decoder checks clock line
status at least every 5 milliseconds. If a system Request to Send (RTS) is detected, the decoder clocks 11 bits in. After
10
th bit, the decoder checks for high state in data line then pulls it low and clocks one more bit to signal the system that
data has been received. If data is low after the 10
th bit, it indicates a frame error. The decoder should continue to count
until data line goes high, then pulls it low and issues a RESEND to the system.
Device ID
The EM83110A has support two device ID mode:
1.
Controllable ID mode: Using the 3 bits DIP switch to control the device ID.
2.
Random generate ID mode: Using the push bottom to entry the device ID set mode. The EM83110A will receives
10 seconds the new device ID after push bottom pressed. When PC reset, the device ID will recovery from
EEPROM.
Command from the system
The system can send commands to the decoder at any time. The decoder needs to respond within 20 milliseconds,
unless the system prevents decoder output, when doing self test or executing a RESET. The following are the decoder
input commands and he actions that decoder needs to take.
Set/Reset Status indicators (Hex ED)
- Responds ACK.
- Receives option byte.
- Responds ACK.
- Updates status indicators.
- Return to previous scanning state.
Echo (Hex EE)
- Responds with EE hex.
- Returns to previous scanning state.
Invalid commands (Hex EF and F1)
- Responds with EE hex.
- Returns to previous scanning state.
Select Alternate Scan Code (Hex F0)
- Responds ACK.
- Clears output buffer.
* This specification are subject to be changed without notice.
3
2002/11/15
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