Z-World SR9300, Руководство пользователя

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User’s Manual 27
C.1 A/D Converter Card Channel Layout
The A/D converter card contains a single 11-input 12-bit A/D converter, TLC2543. The
method of interfacing to this chip is a combination of single-bit writes via board registers
and synchronous clocked serial access via the CPU card’s serial port B, which is extended
across all eight slots. In addition, a serial EEPROM is installed on the A/D converter card
to store the calibration constants.
Table C-3. A/D Converter Card Control Registers
Address Data Bits Value Description
0x0 Write D7–D0
D7–D4 selects input channel,
D3–D0 selects conversion channel
Load A/D converter with data byte
0x0 Read D1
0 A/D converter end of conversion signal
1 A/D converter busy
0x1 Write D0
0 Enable A/D conversion
1 Disable A/D conversion
0x2 Write D0
0 EEPROM clock line low
1 EEPROM clock line high
0x3 Write D0
0 EEPROM data line low
1 EEPROM data line high
0x0 Read D2
0 EEPROM acknowledge signal
1 EEPROM busy