Hardware
1.5 Analog Inputs and Outputs
1.5.1 Signals of Blood Cell Counts
The CPU board has three A/D converters, U10 (AD7928), U11(AD7908) and
U14 (AD7908). Both the AD7928 and AD7908 feature 8-channel and 1MSPS,
only the former is 12-bit converter and the latter 8-bit. The U10 is actually
installed and powered by a 2.5V supply, while the U11 and U14 are reserved.
The sampling speed is set to 500KSPS.
1.5.2 Signals of System Monitoring
The Super I/O monitors such system status as the +48V, +12V and -12V
supplies of the analog board, the +3.3V and +12V supplies of the CPU board
itself and the temperature of the whole analyzer.
1.5.3 Signals of LCD Contrast
The Super I/O generates PWM signals that are then integrated to output a
0~2.5V analog signal to control the LCD contrast. The user can adjust the
contrast through the software interface.
1-8 BC-2800 Auto Hematology Analyzer (V1.0)
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