Adaptec 1225SA Adaptec 1420SA Activity LED and I2C Connector Specification, J2-I2C Connector

Appendix E: HostRAID Controller LED and I2C Connector Reference ● 90

J2—I2C Connector

Pin Number	Signal	Description
1	TWSISDA	I2C Data
2	GND	Ground
3	TWSISCK	I2C Clock

J3—Aggregate LED Header

Pin Number	Signal	Description
1	LED_SUM	Aggregate Cathode
2	+3.3V	Aggregate Anode

J4—Activity LED Connector

Pin Number	Signal	Description		22-55-2081
1	ACT_LED3-	PORT 3 Cathode		2
2	+3.3V	PORT 3 Anode		1
3	ACT_LED2-	PORT 2 Cathode		4
4	+3.3V	PORT 2 Anode		3
5	ACT_LED1-	PORT 1	Cathode	6
6	+3.3V	PORT 1	Anode	5
7	ACT_LED0-	PORT 0	Cathode	8
8	+3.3V	PORT 0	Anode	7

Adaptec 1420SA Activity LED and I2C Connector Specification

2170200EU-R	AAR-1420SA/EFIGS RoHS KIT
2170200JA-R	AAR-1420SA/JA RoHS KIT
2170200-R	AAR-1420SA RoHS KIT
2170500-R	AAR-1420SA RoHS Single

J2—LED Connector

Pin Number	Signal	Description
1	LED OUT0-	PORT 0 Cathode
2	LED OUT 1-	PORT 1 Cathode
3	LED OUT 2-	PORT 2 Cathode
4	LED OUT 3-	PORT 3 Cathode

Note: Board circuitry supports common anode backplane implementations.