Detector Main Board (Dam/Mwm) - Agilent Technologies 1100 Series Reference Manual

6 Introduction to the Detector

Detector Main Board (DAM/MWM)

This board controls all information and activities of all assemblies within the
detector. Through interfaces (LAN, CAN, GPIB or RS-232C) connected to the
user interface, the operator enters parameters, changes modes and controls
the detector.
ASIC — Application Specific Integrated Circuit
The 304-pin application specific integrated circuit (ASIC) provides interfacing
to external devices through drivers, including LAN, GPIB, CAN, APG remote,
and RS-232C. It also provides generic functionality like PWM (pulse width
modulation) and digital encoder reading.
Main processor
The Motorola MC 68332 microprocessor acts as the main processor with a
clock frequency of 16 MHz. It exchanges data with the ASIC through the core
bus as well as with the PSRAM (pseudo-static random access memory) of
2 × 512 kilobyte, the flash EEPROM (electrically erasable programmable
read-only memory) of 1 MB and the 1 × 32 KB battery-backed
NV-RAM (non-volatile). Battery life is designed to last for more than 25 years
under normal operating conditions.
Control lines provide communication to the lamp supply section, which
controls the deuterium and tungsten lamps. The main processor is connected
to the SSP (signal and spectra processor) through an 8-bit parallel bus.
SSP — Signal and Spectra Processor
The SSP (signal and spectra processor) utilizing a dedicated ASIC and RAM of
3 × 128 KB, converts the 1024 raw data values to intensity and absorbance
values.
238 1100 Series DAD and MWD Reference Manual