L9177A pinout and pin description UM2263
8/20 DocID030859 Rev 1
12 GND_O2H O2 sensor heater ground PWR GND
13 NC Not connected - -
14 INO2H O2 sensor Heater input Signal I
15 RESET Reset signal to the micro Signal O
16 IN_REL2 Relay 2 parallel control input Signal I
17 IN_REL1 Relay 1 parallel control input Signal I
18 NC Not connected - -
19 NC Not connected - -
20 REL2 Relay 2 driver output PWR O
21 GND_P_1 Power ground relay 1-2 PWR GND
22 NC Not connected - -
23 REL1 Relay 1 driver output PWR O
24 NC Not connected - -
25 NC Not connected - -
26 NC Not connected - -
27 REL3 Relay 3 driver output PWR O
28 GND_P_2 Power ground for lamp PWR GND
29 NC Not connected - -
30 LAMP Lamp driver output PWR O
31 LAMP Lamp driver output PWR O
32 SO SPI data out Signal O
33 Si SPI data in Signal I
34 SCK SPI clock in Signal I
35 CS SPI Chip Select Signal I
36 KEY Key signal Signal I
37 INJ1 Injector1 driver output PWR O
38 IN1 Injector1 driver input command Signal I
39 GND_INJ1 Injector1 ground PWR GND
40 GND_INJ2 Injector2 ground PWR GND
41 IN2 Injector2 driver input command Signal I
42 INJ2 Injector2 driver output PWR O
43 KL_TX K-Line TX digital IN Signal I
44 KL_RX K-Line RX digital OUT Signal O
45 KL_Line K-Line PWR I/O
Table 1. L9177A pin descriptions (continued)
Pin
Number Pin Name Description Class I/O Type
