Analog Integrated Circuit Device Data

Freescale Semiconductor

7

MM912_P812

PIN CONNECTIONS

Table 4. MM912_P812 Pin Definitions

Analog

or MCU

Pin

Pin Name

Pin

Function

Formal Name

Description and Recommendations

-

1

N.C.

Unused

-------

Unused pin, leave open

-

2

N.C.

Unused

-------

Unused pin, leave open

Analog

3

MTX

Input

ISO9141 Data Input to

MCU

Input logic level ISO9141 data, from the MCU, to the ISO9141 IN/OUT

pin

Connect to MCU SCI TXD output (pin 90) if using ISO9141 circuit

Analog

4

MRX

Output

ISO9141 Data Output to

MCU

Output logic level ISO9141 data to the MCU from the ISO9141 IN/OUT

pin

Connect to MCU SCI RXD input (pin 89) if using ISO9141 circuit

Analog

5

WDRFSH

Input

Watchdog Refresh

Logic Level input from MCU to refresh the watchdog circuit to prevent

RESET

Connect to MCU I/O output (e.g. PT4 pin 48)

Analog

6

TM_EN

Input

Test Mode Enable

Used by Freescale test engineering, Connect to Ground

-

7

N.C.

Unused

-------

Unused pin, leave open

-

8

N.C.

Unused

-------

Unused pin, leave open

Analog

9

ROUT

Output

Relay Driver Output

Low side relay driver output driven by parallel input RIN Use ESD

capacitor where the signal goes off the PC Board

Analog

10

PGND2

Ground

Power Ground 2

Ground for the RELAY driver output Connect to Ground

-

11

N.C.

Unused

-------

Unused pin, leave open

Analog

12

LAMPOUT

Output

Warning Lamp Output

Low side driver output for MIL (warning lamp) driven by parallel input

LAMPIN. Use an ESD capacitor where the signal goes off the PC Board

-

13

N.C.

Unused

-------

Unused pin, leave open

Analog

14

DGND

Ground

Supply Ground

Used as ground for all low power signals. Connect to Ground

-

15

N.C.

Unused

-------

Unused pin, leave open

Analog

16

PGND1

Ground

Power Ground 1

Ground for INJOUT injector driver output. Connect to Ground

Analog

17

INJOUT

Output

Injector Driver Output

Low side driver output for the Injector driven by parallel input INJIN. Use

an ESD capacitor where the signal goes off the PC Board.

-

18

N.C.

Unused

-------

Unused pin, leave open

-

19

N.C.

Unused

-------

Unused pin, leave open

-

20

N.C.

Unused

-------

Unused pin, leave open

Analog

21

WD_INH

Input

Watchdog Inhibit

Normally tied to GND, If tied high through a pull-up, it inhibits RESET

from occurring when a watchdog timeout occurs. Normally connect to

Ground.

Analog

22

TEST1

Input

Test 1

MUST be tied to GND. Connect to Ground

Analog

23

TEST2

Input

Test 2

MUST be tied to GND. Connect to Ground

Analog

24

TEST3

Input

Test 3

MUST leave OPEN. leave open

-

25

N.C.

Unused

-------

Unused pin, leave open

Analog

26

IGNOUTL

Output

Ignition Output Low

Low side output to drive the Gate/Base of the IGBT/Bipolar Darlington

The network used on this pin is determined by the user requirements.

Analog

27

IGNOUTH

Output

Ignition Output High

High side output to drive the Gate/Base of IGBT/Bipolar Darlington

The network used on this pin is determined by the user requirements.