Sap Pca9555; Sap I²C Addresses; User Definable Leds - nVent SCHROFF 21596-077 User Manual

Schroff Shelf Alarm Panel (SAP)
21596-077

6 SAP PCA9555

The PCA9555 device:
• controls the status of the LEDs
• reads the status of the Telco Alarm Cutoff push button (CLEAR)
• controls the Telco Alarm relays
Table 1: SAP PCA9555 Device Function
D
PCA9555 I/O pins
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
6.1 SAP I²C Addresses
Table 2: SAP I²C Addresses
LM75
0x96/0x4b

6.2 User definable LEDs

The LEDs USER (1, 2, 3) are user definable and connected to the I²C-bus I/O
port of the PCA 9555 on the SAP.
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Function
Power Alarm to telco relays output
Minor Alarm to telco relays output
Major Alarm to telco relays output
Critical Alarm to telco relays output
N/C
LED_MIN (Minor alarm LED) output
LED_MAJ (Major alarm LED) output
LED_CRIT (Critical alarm LED) output
Alarm cutoff push button input
Minor Clear input
Major Clear input
N/C
N/C
LED_USER3 output
LED_USER2 output
LED_USER1 output
SEEPROM PCA9555
0xa6/0x53 0x44/0x22
4
SAP PCA9555
State
1 = relays powered
1 = relays powered
1 = relays powered
1 = relays powered
Pulled High
1 = On
1 = On
1 = On
0 = push button pushed
0 = voltage applied to input pins
0 = voltage applied to input pins
Pulled High
Pulled High
1 = On
1 = On
1 = On
R1.0, February 05, 2008