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4. BOARD/UNIT DESCRIPTION
Service Manual BSM-4100 4.3
The large capacity capacitor (Super capacitor) allows the 1 MB system RAM
(SRAM) to back up the trendgraph, vital sign list, arrhythmia recall, monitoring
conditions for each parameter and alarm settings for 30 minutes or more after the
power is turned off. When the instrument is turned on after more than 30 minutes
power off is past, the host CPU regards the backup data as damaged and initializes
them.
The 32 KB backup RAM (non-volatile memory) permanently keeps the storage of
the system setup conditions and alarm master settings after the power is turned off.
The lithium battery allows the real-time clock IC to update the date and time while
the power is turned off. The lifetime of the lithium battery is approx. 6 years or
more.
The two memory card interfaces select the bank at every 512 KB and can select the
attribute memory or common memory from the memory card.
The host CPU periodically reads the status of all the hard keys on the instrument
through the ACORN and executes the process according to the key status. The
status of the Record key and NIBP INTERVAL key are also read by the local CPU
in the recorder control block. This is used for the recorder and recorder control
block checks in the monitoring mode. Refer to Section 3 DIAGNOSTIC CHECK.
The touch screen is controlled by a dedicated microchip controller. When you
touch a point on the screen, the microchip controller sends the touch position data
to the host CPU through the ACORN with serial data communication.
The audio circuit uses an FM sound generator (sound source IC) so that the QRS
sound, alarm sound and key sound are generated at the same time. The sound
volume control data as well as the tone and pitch data is written to the FM sound
generator by the host CPU. The audio output signal from the FM sound generator
is amplified by the audio power amplifier so that the speaker sounds.
CLK (4 MHz)
FM sound
generator
Audio signal
Power
AMP
Amplified audio signal
Sound volume, tone and pitch data
CPU