33989 datasheet(48/66 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33989

TYPICAL APPLICATIONS

SUPPLEMENTAL APPLICATION NOTES

CAN Mode versus SBC Modes

The table below indicates the CAN interface modes versus

the SBC modes as well as the status of TX, RX and the CAN

bus pins.

Table 34. CAN vs SBC Modes

How to Test the MC33989 CAN Interface

The CAN interface can be easily set up and tested.

MC33989 can be connected as in the following figure. V2 is

connected to V1. The device is supplied with nominal supply

(12 V at VSUP input pin). After power on, reset the device,

enter normal request mode, and the CAN interface is set in

normal mode, slew rate 0. TX can be driven by a signal

generator. RX will report the bus state. The figure below is a

simple test schematic.

Figure 38. Testing the CAN Interface

SBC mode

External

ballast

for V2

CAN mode

voltage

CANH/CANL

(disconnected

from other

nodes)

Unpowered

YES

Unpowered

0 V

LOW

Floating to gnd

Reset (with ballast)

YES

0 V

LOW

Floating to gnd

Normal request (with ballast)

YES

0 V

LOW

Floating to gnd

Normal

YES

Normal Slew rate

0,1,2,3

5 V

Internal pull up

to V2.

Report bus state

High if bus

recessive, Low if

dominant

Bus recessive

CANH = CANL =

2.5 V

Normal

YES

Sleep mode

5 V

Floating to gnd

Standby with external ballast

YES

Normal or sleep

0 V

LOW

Floating to gnd

Standby without external

ballast, V2 connected to V1

Normal

5 V

Same as

normal mode

Same as normal

mode

Same as normal

mode

Standby without external

ballast, V2 connected to V1

Sleep

5 V

Floating to gnd

Sleep

—

Sleep

0 V

LOW

Floating to gnd

Stop

—

Sleep

0 V

LOW

Floating to gnd

VSUP

V2CTRL

RESET

INT

MISO

MOSI

SCK

CANH

CANL

HS1

GND

CAN bus

Signal generator

Components list:

C1: 22uF, C2: 100nF

C3: >10uF

C4: 100nF

CANL

CANH

Signal at RX output

Rt: 60 ohms

F<500kz (1Mb/s)

MC33989

RST

33989 Datasheet(PDF) 48 Page - Freescale Semiconductor, Inc

33989 Datasheet(HTML) 48 Page - Freescale Semiconductor, Inc

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