Technical Discussion
80
Keypad
The user interface PCB keypad contains seven push buttons. These buttons allow
the user to setup and control of the NPB-40. The buttons are:
The signals from the buttons pass directly through the SpO
2
PCB and are applied
to the user interface PCB CPU. The
Power
button signal is applied to the SpO
2
power supply turning the NPB-40 on or off.
Backlight
The backlight illuminates the display for better viewing.
CPU and Flash
The CPU controls all functions and timing for the NPB-40. The CPU
communicates with the SpO
2
PCB patient interface. The patient interface signal
are sent to the CPU for processing. The CPU sends signals to the patient sensor
via the patient interface for controlling the sensor light levels.
Real-Time Clock
The real-time clock and non-volatile random access memory (RAM) chip
maintain time and date used in the NPB-40. These circuits utilize a gold
electrolytic super-capacitor for power when the NPB-40 is turned off.
Audio
The audio circuit drives a transducer to provide the NPB-40 tones.
1 — Alarm Silence
5 — Backlight
2 — Down Arrow
6 — Up Arrow
3 — Data
7 — Power
4 — Menu
Содержание Oximax NPB-40
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Страница 5: ...Contents NPB 40 iii Power Supply 81 Power Supply Monitoring 81 Index 103...
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