GBS Elektronik MCA-527 - Manual (Page 21)

Hardware
2.2.12 Connector Pinouts
Charger Connector
The charger connector is a widespread low voltage connector, but allows to lock the plug.
The inner diameter is 2.1mm, the outer diameter is 5.5mm.
Table 2: Pinout of the Charger Input Connector (Lumberg 161003)
Contact Signal Front View
1 (inner contact) +12VDC / 1A max.
2 (outer contact) 0V
Preamplifier Power Supply Connector
Besides supplying power for the detectors preamplifier, three pins of this connector have
special functions which are only available in the MCA527 and not in the MCA527L.
●
Pin 5 is a multi-function input. It can operate as a HV-inhibit input to shut down high
voltage in case a HPGe gets warm. If this function is not needed, it can be used as
an auxiliary analog input with 0V...10V input voltage range and 11bit resolution. In
conjunction with the calibrated built-in current source it is well suited for measuring
external resistors in the range of 0
Ω ...8k Ω . This feature allows easy analyzing of a
thermistor or any other resistive sensor.
●
Pin 8 serves a 1-wire interface designed to communicate with a temperature
sensor inside the detector (e. g. Maxim DS1822, 18B20 or similar) or any other
1-wire device. The bus is powered with a voltage of 3.3V. All externally connected
devices must be able to accept this voltage. Currently only the DS1822 (or
compatible) temperature sensor is supported but functionality may be extended on
request.
●
Pin 3 is an auxiliary 11bit ADC input with an input range of 0V...10V and an input
impedance of 1M
Ω which is sampled once a second. It is integrated for future
extensions, e. g. measuring temperature with an analog temperature sensor or
similar.
A block diagram and a more detailed description of all functions can be found in chapter
2.2.10, Functions of the D-SUB9 connector.
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