33742_08 datasheet(4/70 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33742

PIN CONNECTIONS

Figure 3. 33742 28-Pin Connections

WDOG

MISO

SCLK

GND

CANL

CANH

MOSI

RXD

RST

INT

GND

V2CTRL

VSUP

TXD

VDD

Table 2. 33742 28-Pin Definitions

A functional description of each pin can be found in the Functional Pin description section beginning on page 23.

Pin Name

Formal Name

Definition

RXD

Receive Data

CAN bus receive data output pin.

TXD

Transmit Data

CAN bus transmit data input pin.

VDD

Voltage Digital Drain

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

RST

Reset Output

(Active LOW)

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

Interrupt Output

(Active LOW)

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 33742-to-PCB thermal path.

Voltage Source 2

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

internal supply for the CAN transceiver.

V2CTRL

Voltage Source 2 Control

Output drive source for the V2 regulator connected to the external series pass transistor.

VSUP

Voltage Supply

Supply input pin for the 33742.

High Side Output

Output of the internal high side switch. The output current is internally limited to 150mA.

14–17

L0-L3

Level 0-3 Inputs

Inputs from external switches or from logic circuitry.

CANH

CAN High Output

CAN high output pin.

CANL

CAN Low Output

CAN low output pin.

SCLK

Serial Data Clock

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

MISO

Master In Slave Out

SPI data sent to the MCU by the 33742. When CS is HIGH, the pin is in the high-

impedance state.

MOSI

Master Out Slave In

SPI data received by the 33742.

Chip Select

(Active LOW)

The CS input pin is used with the SPI bus to select the 33742. When the CS is asserted

LOW, the 33742 is the selected device of the SPI bus.

WDOG

Watchdog Output

(Active LOW)

The WDOG output pin is asserted LOW if the software watchdog is not correctly

triggered.

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