33989 datasheet(3/66 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33989

PIN CONNECTIONS

Figure 3. 33989 Pin Connections

Table 1. 33989 Pin Definitions

A functional description of each pin can be found in the Functional Pin Description section beginning on page 18.

Pin Number

Pin Name

Pin Function

Formal Name

Definition

Output

Receive Data

CAN bus receive data output pin.

Input

Transmit Data

CAN bus transmit data input pin.

VDD1

Power

Output

Voltage Digital Drain

One

5.0 V regulator output pin. Supply pin for the MCU.

RST

Output

Reset

This is the device reset output pin whose main function is to reset the

MCU. This pin has an internal pullup current source to VDD.

INT

Output

Interrupt

This output is asserted LOW when an enabled interrupt condition occurs.

The output is a push-pull structure.

6–9

20–23

GND

Ground

These device ground pins are internally connected to the package lead

frame to provide a 33989-to-PCB thermal path.

Input

Voltage Source Two

Sense input for the V2 regulator using an external series pass transistor.

V2 is also the internal supply for the CAN transceiver.

V2CTRL

Power

Output

Voltage Control

Output drive source for the V2 regulator connected to the external series

pass transistor.

VSUP

Power

Voltage Supply

Supply input pin for the 33989.

HS1

Output

High Side One

Output of the internal high-side switch. The output current is internally

limited to 150 mA.

14–17

L0:L3

Input

Level 0: 3

Inputs from external switches or from logic circuitry.

CANH

Output

CAN High

CAN high output pin.

CANL

Output

CAN Low

CAN low output pin.

SCLK

Input

System Clock

Clock input pin for the Serial Peripheral Interface (SPI).

MISO

Output

Master In/Slave Out

SPI data sent to the MCU by the 33989. When CS is HIGH, the pin is in

the high-impedance state.

MOSI

Input

Master Out/Slave In

SPI data received by the 33989.

Input

Chip Select

The CS input pin is used with the SPI bus to select the 33989.

Output

Watch Dog

The WD output pin is asserted LOW if the software watchdog is not

correctly triggered.

MISO

SCLK

GND

CANL

CANH

MOSI

RST

INT

GND

V2CTRL

VSUP

HS1

VDD1

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