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33389

System Basis Chip with Low Speed Fault Tolerant CAN

Freescale Semiconductor 

PIN CONNECTIONS

TX 1

V1 2

RX 3

RST 4

INT 5

GND 6

GND 7

GND 8

GND 9

MISO 10

MOSI 11

SCLK 12

CS 13

L2 14

28 V3

27 VBAT

26 RTL

25 V2

24 CANH

23 GND

22 GND

21 GND

20 GND

19 CANL

18 RTH

17 NC

16 L0

15 L1

Table 2. 33389 Pin Definitions: SOICW 28-Lead

A functional description of each pin can be found in the Functional Pin Description section beginning on page 17.

Pin Number

Pin

Name

Formal Name

Definition

1

TX

Transmitter Data

Transmitter input of the LS CAN interface

2

V1

Voltage Regulator This 5.0 V pin is a 3% low drop voltage regulator dedicated to the microcontroller supply.

One

3

RX

Receiver Data

Receiver output of the LS CAN interface

4

5

6 -9 20 - 23

RST

INT

GND

Reset

Interrupt

Ground

This is an Input/Output pin.

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

These device ground pins are internally connected to the package lead frame to provide

a 33389-to-PCB thermal path.

10

MISO

Master In/Slave Out This pin is the tri-state output from the shift register.

11

MOSI

Master Out/Slave In This pin is for the input of serial instruction data.

12

SCLK

System Clock

This pin clocks the internal shift registers.

13

14, 15, 16

CS

L0: L2

Chip Select

Wake-up Input

(L0: L2)

This pin communicates with the system MCU and enables SPI communication.

Input interfaces to external circuitry. Levels at these pins can be read by SPI and input

can be used as programmable wake-up input in Sleep or Stop mode.

17

NC

No Connect

This pin does not connect.

18

RTH

Thermal Resistance Pin for the connection of the bus termination to CANH

High

19

CANL

CAN Low

24

CANH CAN High

CAN low input/output

CAN high input/output

25

V2

Voltage Regulator This 5.0 V pin is a low drop voltage regulator dedicated to the peripherals supply.

Two

26

RTL

Thermal Resistance Pin for the connection of the bus termination to CANL

Low

27

VBAT

Voltage Battery

This pin is voltage supply from the battery.

28

V3

Voltage Regulator

This pin is a 10 Ω switch to VBAT, used to supply external contacts or relays.

Three

Analog Integrated Circuit Device Data

Freescale Semiconductor

33389

5

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