MC33199D 데이터 시트보기 (PDF) - Motorola => Freescale

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MC33199D

Automotive ISO 9141 Serial Link Driver

Motorola => Freescale 

MC33199

Figure 3. Current Source I1 AC Characteristics

Tx D Signal

120mA

tBit

tI1F

tI1H

5V

0V

Typical I1

Waveform

Current Source I1

Maximum Limit

40mA

4mA

2mA

tI1R

Current Source I1

Minimum Limit

At static HIGH or LOW level Txd, the current source I1 delivers a current of 3mA (typ). Only during LOW to HIGH transition, does this current increase to a higher

value in order to charge the K Line capacitor (Cl<4nF) in a short time.

Figure 4. Current Source I1 and DIA Discharge current test schematic.

+5V +12V

Input

Signal

Vcc Vbat

Ref-out

I1

Ref-in-L

Ref-in-K DIA

TxD

LO

RxD

GND

I1 pulse

current

33nF

10Ω

DIA discharge

current

To Oscilloscope

MC33199

MOTOROLA

5

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