Micromanager; Battery Backup Voltage Regulator Circuitry; Real Time Clock; Recorder Interface - Datascope Accutorr Plus Service Manual

Theory of Operation
1.2.4.5

Micromanager

This device provides a number of features that are useful for management of this board.
They are listed as follows:
A.
B.
C.
1.2.4.6

Battery Backup Voltage Regulator Circuitry

Implements regulation of the STANDBY VOLTAGE from the main power supply to 4V
+/- 0.2V dc with a current draw of 821 uA max.
1.2.4.7

Real Time Clock

This device provide seconds, minutes, hours, date of the month, month, and year with leap
year compensation. The device is memory mapped to be pointed to as software requires.
Also, provisions for running this device include main power supply and battery operation
in order for the RTC to keep time when the system is not powered. A lithium battery is
included, having a minimum of 10 years of operation, for configuration and clock data
retention during battery changes and main battery failure. Accuracy is +/- 1 minute/week.
1.2.4.8

Recorder Interface

IDMA capability for writing 8-bit buffered parallel data to the recorder. Handshaking
signals to specify new line to be printed, request for next byte of data.
Accutorr Plus Service Manual
ON/STANDBY capability through keyboard control
Watchdog timer
Conversion of CMOS SRAM to pseudo nonvolatile memory
0070-10-0691
CPU/NIBP Module Assembly with LCD Display
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