GE IS200STAIH1ABB MARK VI TRBD ANLGIO CARD

Description

GE General Electric Technical Specifications: IS200STAIH1ABB

The battery’charg’er circuitcian be viewed as three circuits

which are overlaid to form one circuit. The first circuit (the

major source of charge) is from the +12 V supply and

provides a nearly consta nt input of approximately 9 mA. The

second circuit comes IS200STAIH1ABB from the +5 V line which will provide a

rioininal9 mA and is’ cut off toa’ very small trickle as the

batteries become Hilly charged. The third circuit is the

discharge circuit which provides a low resistance path (120

ohms) or at most a diode drop when the VBAT current drain

is large. The zener protects the CMOS circuitry if +5 V drops

out and +12 Vis still present. In addition, note IS200STAIH1ABB that the VBAT

is provided anytime +5 V is present This provision protects

the CMOS circuits by providing power to the CMOS

whenever an input is possibly present.

-Three AAAsize N iCads supply power to the memory for five

days when fully charged. It will take at least twenty-four

hours of operation to charge the batteries to full capacity.

The IS200STAIH1ABB power fail detect circuit will detect when the 5 volt

. supply-to the board falls below 4.7 volts (the factory setting

at ambient) and remains below 4.85 volts (maximum) for

more than four microseconds. When this occurs, the board

will block all access to the memory array. When the 5 volt

supply rises above 4.85 volts, this circuit will again allow

access to the memory.

WARNING: This IS200STAIH1ABB circuit contains a potentiometer which

should not gimerally be set in the field. It is set at the factory

and requires equipment which may not be available to the

user. Changing the setting of this circuit will void the

warranty. If it is changed inadvertently, the following

procedure may be used to reset it.

1. Adjust the 5 volt power supply to 4.70 volts.

2_ Connect an oscilloscope or a voltmeter to the output

(pin 4) of the·ICLB211 (m 2).

3. Adjust R2 until the voltage on pin 4 goes toan active

level (>2.4 V).

4. Slowly’ adjustthe pot in the opposite direction until the

voltage goes low (>.7 V).

5. Readjust the 5 volt supply to 5 volts.

This circuit is also ‘for the detection of /SYSRESET signal

(pin 47 on the STD-Z80 Bus); when this signal is active, all

access is blocked. This allows the board to interface to the

power fail detect board (Mostek Part Number MK77760).

The power fail detect board will detect A.C. power failures

and “brown-outs” and give an early warning signal to the

CPU to allow an orderly shut-down of the system.

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