Analog Integrated Circuit Device Data

8

Freescale Semiconductor

MM912_P812

PIN CONNECTIONS

Analog

28

IGNSUP

Input

Ignition Output Supply

device

Analog

29

IGNFB

Input

Feedback from Source

Voltage feedback from the source of the Ignition driver transistor through

a 10:1 voltage divider. Use a 10:1 voltage divider (36 k/4.02 k)

Analog

30

ISO9141

Input/

Output

ISO9141 K-Line

Bidirectional Serial Data

Signal

ECU Tester, using ISO9141 Protocol. The Output is Open drain and the

capacitor where the signal goes off the PC Board.

Analog

31

VCCSENS

Input

Voltage Sense from

VCC

Feedback to the internal VCC regulator from a external pass transistor.

Must have the minimum of a 2.2

μF capacitor

Analog

32

VCCREF

Output

VCC Reference Base

drive

Base drive voltage for an external PNP pass transistor

Analog

33

VPWR

Supply

Input

Main Voltage Supply

Input

VPWR is the main voltage supply input for the device. It connected to a

+12 volt battery (It should have reverse battery protection and transient

suppression.) It also needs a bypass capacitor to ground (100 nF or

0.1

μF)

MCU

34

PM4

I/O

PM4/

MOSI (SPI)

Port M, I/O pin 4 is a general purpose input or output pin. It can be

configured as the master output (during master mode) or slave input pin

(during slave mode). MOSI for the serial peripheral interface (SPI).

MCU

35

PM3

I/O

PM3/

SS (SPI)

Port M, I/O pin 3 is a general purpose input or output pin. It can be

configured as the slave select output pin SS of the serial peripheral

interface (SPI) (during master mode) and chip select input (CS) (during

slave mode).

MCU

36

PM2

I/O

PM2/

MISO (SPI)

Port M, I/O pin 2 is a general purpose input or output pin. It can be

configured as the master input (during master mode) or slave output pin

(during slave mode). MISO for the serial peripheral interface (SPI).

MCU

37

PM1

I/O

PM1/

TXCAN

Port M, I/O pin 1 is a general purpose input or output pin. It can be

configured as the transmit pin TXCAN of the scalable controller area

network controller (CAN).

MCU

38

PM0

I/O

PM0/

RXCAN

Port M, I/O pin 0 is a general purpose input or output pin. It can be

configured as the receive pin RXCAN of the scalable controller area

network controller (CAN).

MCU

39

VSSX1

Ground

VSSX1

External ground for I/O drivers. Bypass requirements depend on how

heavily the MCU pins are loaded. All VSSX pins are connected together

internally. Connect to Ground

MCU

40

VDDX1

Supply

Input

VDDX1

External power for I/O drivers. Bypass requirements depend on how

heavily the MCU pins are loaded. All VDDX pins are connected together

internally. Connect to VCC and use a 100 nF bypass capacitor to ground.

MCU

41

PP3

I/O

PP3/KWP3/PWM3

Port P, I/O pin 3 is a general purpose input or output pin. It can be

configured as a keypad wake-up input. It can be configured as a pulse

width modulator (PWM) output channel 3.

MCU

42

PT0

I/O

PT0/IOC0/PWM0

Port T, I/O pin 0 is a general purpose input or output pin. It can be

configured as a timer (TIM) channel 0 or pulse width modulator (PWM)

output channel 0.

MCU

43

PT1

I/O

PT1/IOC1

Port T, I/O pin 1 is a general purpose input or output pin. It can be

configured as a timer (TIM) channel 1.

MCU

44

PT2

I/O

PT2/IOC2

Port T, I/O pin 2 is a general purpose input or output pin. It can be

configured as a timer (TIM) channel 2.

Table 4. MM912_P812 Pin Definitions

Analog

or MCU

Pin

Pin Name

Pin

Function

Formal Name

Description and Recommendations