Datex-Ohmeda Anesthesia Delivery Unit S/5 Technical Reference Manual page 438

Datex-Ohmeda ADU
The main CPU measures battery voltages, currents and temperature. There is an A/D-converter and a
CPU bus interface logic for that purpose. These circuits are supplied from a separate +5V supply
powered from the VBUS.
Signals from the battery voltage and current measurement, are amplified and scaled to the A/D-
converter input range of 0 to 10V. Voltages from all four batteries, currents from both battery packs
and temperature from battery pack A are measured. The eighth channel of the A/D-converter is
reserved for an external analogue input.
The reference voltage for the A/D-converter is derived from +5V reference voltage. It is also used as a
reference for the line comparator, shutdown comparator and battery charger circuit.
Figure 7
D-8
Battery charger board
Document No. 8502856