LSI SYM22801 - Manual (Page 65)

Operational Environment A-9
A.3.3 The LED Interface
The LED interface on the SYM22801 is a four-wire arrangement that
allows the user to connect an LED harness to the board. The
GPIO0_FETCH line (maximum output low voltage 0.4 V and minimum
output low current 16 mA) is pulled low to complete the circuit when a
harness with an LED is attached. The connectors on the SYM22801 are
J5 and J9.
Table A.5 LED Connectors J5/J9
Signal Name Pin
LED+ 1
LED
−
2
LED
−
3
LED+ 4