LED and Tone Module Theory of Operation
1 - 16 0070-10-0691 Accutorr Plus Service Manual
1.5 LED and Tone Module
The Accutorr Plus LED/Tone module performs four main tasks: 1) It drives all the 7-
segments and discrete LED user displays on the keypad; 2) it generates an IEC60601-1-8
compliant alarm signal via the onboard Digital-to-Analog-Converter (DAC) and drives
advisory tones to the speaker by the onboard power amplifier; 3) it controls the interface
between the main CPU and the keypad; the functionality on the module is accomplished
by the use of a Field Programmable Gate Array (FPGA) device; and 4) DAC drives view
angle of trend display.
The LED/Tone module is under direct control of the CPU/NIBP module for inputs, and
converts the input data into LED segment drive as well as the audio tones for advisory and
alarm conditions.
FIGURE 1-3 LED/Tone Module, Functional Block Diagram
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