Predictive Thermometer Module - Datascope Accutorr Plus Service Manual

2.2.4 Predictive Thermometer Module

Overview
The Accutorr Predictive Thermometer Module, is an optional accessory to the
Accutorr Plus or Plus with SpO
The Predictive Thermometer PCB consists of 2 68HC705C8A microcontrollers (MCU)
IC's (U4 and U3). MCU U2, is provided by Sherwood Medical, and its software program
converts the thermistor output signal to a seven segment code used to drive a display.
The second MCU U3 software program, converts the seven segment code to a serial
TTL-level signal, that is isolated from the main Accutorr Monitor via opto-isolators.
Block Diagram
An overall block diagram of the Predictive Thermometer PCB is shown below. The
Predictive Thermometer PCB consists mainly of a differential amplifier (ICL7612), an
A/D converter (ADC0834B) and 2 microcontroller IC's that convert the analog signal of
the input temperature probe to a serial TTL-level signal.
Software Control
The determination and processing software within the module is adapted under license
from an outside vendor, as part of U4. Software control of data communicated to the
LED/CPU board for further processing and display control.
Accutorr Plus Service Manual
Chapter 2 - Theory of Operation
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2
Figure 2-6
Predicative Temperature
Module Block Diagram
2-21
Revised 12/20/00