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D.2 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 Con-
verter Card to store the calibration constants.
Table D-4. A/D Converter Card Control Registers
Address
0x0
0x0
0x1
0x2
0x3
0x0
Data Bits
Write D7–D0
Read D1
Write D0
Write D0
Write D0
Read D2
Value
D7–D4 selects input channel,
D3–D0 selects conversion channel
0
1
0
1
0
1
0
1
0
Description
Load A/D converter with data byte
A/D converter end of conversion signal
A/D converter busy
Enable A/D conversion
Disable A/D conversion
EEPROM clock line low
EEPROM clock line high
EEPROM data line low
EEPROM data line high
EEPROM acknowledge signal
176
1
EEPROM busy
Smart Star (SR9000)
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