GE IS200STCIH6ADD communication module

Description

GE General Electric Technical Specifications: IS200STCIH6ADD

Rectified AC IS200STCIH6ADD voltage from the voltage transformer module is

divided through a resistive network and used as an input to

a comparator (U2) with an internal reference. The

comparator “peak detects” the adjustable AC input which is

factory set to approximately 95 VAC as a brown-out

detection level. The IS200STCIH6ADD comparator outputtriggers a retriggerable

CMOS one shot (V2 of U3) with a period of 13 mSec. This

output generates the NMIRQ signal, and it also triggers a

second one shot (Y2 of U3) which inhibits the first one shot

for a period of 5 mSec. This second delay is necessary to

allow a software power-down subroutine to complete

before SYSRESET is generated.

When the IS200STCIH6ADD interrupt port OF7H (PFD board address) is read by

the power-down subroutine, a 0 in data bit 7 (D7) indicates

power fail condition which a 1 indicates no power failure.

The last instruction of the power-down subroutine should

be a write to port address OF7H. This will set the SYSRESET

flip-flop (Y2 of US) and cause SYSRESET to go low. The

above conditions will be maintained by battery backed up

CMOS logic until power is restored.

POWER UP SEQUENCE

When the power is detected by the MDX-PFD voltage

comparator circuit, a reset signal is released from a counter

(U6), allowing itto count. The IS200STCIH6ADD counter then releases NMIRQ,

nonmaskable interrupt request, causing it to go high after

approximately 130 mSec. Next the counter releases

SYSRESET, causing it to go high after approximately 260

mSec after AC power is detected, thus allowing normal

system operation to begin the power up subroutine starting

at address DOH or EOOOH. These delays are necessary in

order to allow DC power to stabilize after AC power has

been restored. Loss of power at any.time before system

reset goes high will cause the counter to be reset and the

130/260 mSec timer sequence to be repeated after AC

power is again restored.

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