mc33199

SEMICONDUCTOR

MC33199

Automotive ISO 9141 Serial Link Driver

ISO 9141 SERIAL LINK DRIVER

SEMICONDUCTOR TECHNICAL DATA

Block Diagram and Typical Application

PIN CONNECTIONS

VCCREF-IN-LREF-IN-KLORXDTXDNC

1234

14131211

REF-OUTVSLI1GNDDIANC

ORDERING INFORMATION

Device

TemperatureRange

Package

MC33199D

© Motorola,Inc 1996

- 40°C to+125°C

SO14

Rev 1

MC33199

MAXIMUM RATINGS

Ratings

ELECTRICAL RATINGS (Note 1)Vs Supply Pin:

- DC Voltage Range

- Transient Pulse (Note 2)Vcc Supply DC Voltage Range

DIA and L Pins (Note 2) :- DC Voltage Range

- Transient Pulse (clamped by internal diode)- DC Source Current

- DIA Low Level Sink CurrentTXD DC Voltage RangeREF-IN DC Voltage Range- VS < Vcc- VS > Vcc

ESD Voltage CapabilityTHERMAL RATINGS

V(ESD)

V

VsVpulseVcc

- 0.5 to + 40- 2 to + 40- 0.3 to + 6- 0.5 to + 38

- 2- 50Int. Limit-0.3 to Vcc +0.3-0.3 to Vcc-0.3 to VS+/-2000

VVVVmAmAVV

Symbol

Value

Unit

Storage Temperature

Operating Junction TemperatureThermal Resistance, Junction to airMax Power Dissipation (@ Tamb=105°C)

TstgTjRtjaPd

- 55 to + 150- 40 to + 150

180250

°C°C°C/WmW

NOTE 1 : The device is compatible with Specification: “Diagnosis System ISO9141”

NOTE 2 : See the test Circuit (Fig.23). Transient test pulse according to ISO76371 and DIN 40839, highest test levels.

ELECTRICAL CHARACTERISTICS.Tamb from - 40°C to + 125°C, Vcc from 4.5V to 5.5V, Vs from 4.5V to 20V unless otherwise note. Typical values

reflect approximate mean at 25°C, nominal VCC and VS, at time of device characterization.

Parameters

VCC Pin 1

Vcc Supply Voltage RangeVcc Supply Current (Note 3)REF-IN-L Pin 2 and REF-IN-K pin 3REF-IN-L & REF-IN-K Input Voltage Range:- for 0 REF-IN-L & REF-IN-K Inputs CurrentsLO Pin 4

LO open Collector Output

- Low Level Voltage @ Iout = 1mA- Low Level Voltage @ Iout = 4mARXD Pin 5

Pull up resistor to Vcc

Low Level Voltage @ Iout=1mATXD Pin 6

SymbolMinTypMaxUnit

VccIcc

4.50.5

1

5.51.5

VmA

Vinref

22

Ivin

- 5

Vcc - 2VVs - 1V

5

V

µA

Vol

0.34

0.70.8

V

RrxdVol

1.520.3

2.50.7

kΩV

High Level Input VoltageLow Level Input Voltage

VihVil

0.7Vcc2.82

0.3Vcc

VV

MC33199MOTOROLA2

MC33199

ELECTRICAL CHARACTERISTICS.Tamb from - 40°C to + 125°C, Vcc from 4.5V to 5.5V, Vs from 4.5V to 20V unless otherwise note. Typical values reflect approximate mean at 25°C, nominal VCC and VS, at time of device characterization.

Parameters

Symbol

Min

Typ

Max

UnitµA

Input Current @ 0DIA INPUT / OUTPUT Pin 9

Low Level Output Voltage @ I = 30mADrive Current Limit

High Level Input Threshold Voltage(REF-IN-K connected to REF-OUT)Low Level Input Threshold Voltage(REF-IN-K connected to REF-OUT)Input Hysteresis

Leakage Current (Note 4)

Over temperature Shutdown (Note 5)L INPUT Pin 12

High Level Input Threshold Voltage(REF-IN-L connected to REF-OUT)Low Level Input Threshold Voltage(REF-IN-L connected to REF-OUT)Input Hysteresis

Leakage Current (Note 6)L1 INPUT Pin 11Static Source Current

Static Saturation Voltage @ I1s=-2mADynamic Source Current (Note 8)

Dynamic Saturation Voltage @ I1s=-40mAVS Pin 13

Vs Supply Voltage RangeVs Supply Current (Note 8)REF-OUT Pin 14

Output Voltage :

@ 3 < Vs < 5.6V & Iro = +-10µA@ 5.6 < Vs < 18V & Iro = +-10µA@ 18 < Vs < 40V & Iro = +-10µAMaximum output current Pull-up resistor to Vcc

IhIl- 200- 600+ 30- 100

VolIlimVihVilVhystIleakTlim

040Vref min+ 0.25VVref min- 0.2V3004155

0.350.8120

VmAVVmVuA°C

Vref+ 0.325VVref- 0.125V45010

Vref max+ 0.4VVref max- 0.05V60016

VihVilVhystIleak

Vref min+ 0.25VVref min- 0.2V3004

Vref+ 0.325VVref- 0.125V45010

Vref max+ 0.4VVref max- 0.05V60016

VVmVuA

I1sVI1satI1dVI1dsat

- 4Vs - 1.2- 120Vs - 2.7

- 3Vs - 0.8- 80Vs - 0.85

- 2Vs- 40Vs

mAVmAV

VsIs

4.50.5

1.3

202

VmA

Vref

2.70.5 x Vs8.5

IoutRpu

- 503

8

3.30.56 xVs10.85012

V

µAKΩ

NOTE 3: Measured with TXD=Vcc, I1=Vs, DIA & L high, no load, REF-IN-L and REF-IN-K connected to REF-OUT.

DYNAMIC CHARACTERISTICS.Tamb from - 40°C to + 125°C, Vcc from 4.5V to 5.5V, Vs from 4.5V to 20V unless otherwise note

Parameters

Transmission SpeedHigh or Low Bit Time

Symbol1/t Bitt Bit

Min05

Typ

Max200K

UnitBdµs

MC33199MOTOROLA3

MC33199

DYNAMIC CHARACTERISTICS.Tamb from - 40°C to + 125°C, Vcc from 4.5V to 5.5V, Vs from 4.5V to 20V unless otherwise note

Parameters

Rxd Output :

- Low to High Transition Delay Time- High to Low Transition Delay TimeLO Output :

- Low to High Transition Delay Time- High to Low Transition Delay TimeDIA Output :

- Low to High Transition Delay Time- High to Low Transition Delay TimeI1 Output @ Vs-I1 > 2.7V :- Rise time- Hold Time

Parameters

Symbol

Min

Typ

Max

Unitns

tRdrtRdftLdrtLdftDdrtDdftI1rtI1fSymbol

450450

µs

22

ns

650650

µs

1.5Min

Typ

0.34.5Max

Unit

Figure1.TXD to DIA AC Characteristic

+5V+12V

5V

tBit

TxD InputSignal

VccRef-outRef-in-LInputSignal

Ref-in-KTxDVbatI1

TestPoint

DIA

1nF

GND

0V

tDdr10V

DIA OutputSignal

2V

tDdf

Figure2.DIA to TxD and L to LO AC Characteristics

+5V+12V

12V

tBit

DIA and LInput Signal

2KVccRef-outRef-in-LRef-in-KTxDVbatLDIAGND

0V

tRdr / tLdr

InputSignalRxD ot LOOutputSignal

4.5V

0.4V

tRdf / tLdf

TestPoints

2x30pF

LORxDMC33199MOTOROLA4

MC33199

Figure3.Current Source I1 AC Characteristics

tBit5V

Tx D Signal

tI1F

tI1H

120mA

Current Source I1Maximum Limit

0V

Typical I1Waveform

40mA

4mA2mA

tI1R

Current Source I1Minimum 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.

Figure4.Current Source I1 and DIA Discharge current test schematic.

+5V+12V

I1 pulsecurrent

VccVbatI1Ref-out

Input

Signal

Ref-in-LRef-in-KTxDLORxD

GND

10Ω

DIA

33nF

DIA dischargecurrent

To Oscilloscope

MC33199MOTOROLA5

MC33199

Figure5.Logic diagram and application schematic

+VbatVcc : 5VVSREF-OUTLOReferenceGeneratorC2+-ProtectionLL LineREF-IN-LREF-IN-KRXDVccC1-+ThermalShutdownTXDDriverCurrentLimitGNDDIAK LineRxDI1sourceI1RPUTxDMCUCAR ELECTRONIC CONTROL UNIT

SERVICE TESTERor End of Line manufacturer programmation or checking system

Figure6.: Typical application with several ECUs

+Vbat

RPUL LineK LineMCUMC33199E.C.U # 1SERVICE TESTERor End of Line manufacturer programmation or checking systemCAR ISO DIAGNOSTIC CONNECTORMCUMC33199E.C.U # 2CAR Other ECUs

Fig 6 : Typical application with several ECUs

MC33199MOTOROLA6

MC33199

Figure7.Icc supply current versus

temperature

Figure8.S supply current versus VS

supply voltage

-40°C

25°C

125°C

Figure9.IS supply voltage versus VS

Supply voltageFigure10.VS voltage versus IS current

(Vcc=5.5V,Vdia,L,I1=20V)

Figure11.REF-OUT Voltage versus VS

Supply voltageFigure12.REF-OUT Voltage versus REF-OUT current

MC33199MOTOROLA7

MC33199

Figure13.L and DIA hysteresis versus temperature

Figure14.L and DIA current versus L and DIA voltage

Figure15.DIA saturation voltage versus temperatureFigure16.DIA current limit versus temperature

I DIA = 40mA

Figure17.RXD pull-up resistor versus temperature

Figure18.TXD and LO saturation voltage versus

temperature

LO

RXD

MC33199MOTOROLA8

MC33199

Figure19.I1 saturation voltage versus

temperature

Figure20.I1 Output DC Current versus

temperature

I=40mA

I=2mA

Figure21.I1 Output Pulse Current versus

VS Supply VoltageFigure22.I1 Pulse current width versus

temperature

Figure23.Test circuit for transient Schaffner pulses

+12V

D2

100nFVbat

I1

LDIAGND

2x330pF

D1

SchaffnerGenerator

2x1nF

Test pulses are directly applied to Vs and via a capacitor of 1nF to DIA and L. The voltage Vs is limited to -2V/38V by the transient suppressor diode D1. Pulses can occur simultaneously or separately.

MC33199MOTOROLA9

MC33199

DEVICE DESCRIPTION

Introduction

The MC33199D is a serial interface circuit used in diag-nostic applications. It is the interface between the microcon-troller and the special K and L lines of the ISO diagnosticport. The MC33199D has been designed to meet the «Diag-nosis System ISO9141» specification.

This product description will detail the functionality of thedevice (see simplified block diagram). First, the power supplyand reference voltage generator will be discussed, then thepaths functions between MCU, K and L lines will be detailed.A dedicated paragraph will tell about the special functionalityof the I1 pin, which allow high Baud rates transmission.Power supplies and reference voltageThe device has two power supplies :

A 5V supply, Vcc, normally connected to the MCU supplyvoltage. This pin sink typically 1mA during operation. A Vbatsupply voltage, VS, normally tied to the car battery voltage.This pin can sustain up to 40V DC. Care should be taken forreverse battery protection and transient voltages higher than40V.

The voltage reference generator is supplied from both Vccand Vbat. It provides reference voltage for the K and L linescomparators thresholds. The reference voltage is dependanton Vbat voltage : it is linear versus Vbat voltage, for Vbatfrom 5,6V to 18V. Below 5.6V and over 18V the referencevoltage is clamped (see fig 11). The reference is connectedexternally to the device, through REF-OUT pin. It is availablefor other needs. It can supplied 50uA max (see fig 12).Path functions between MCU, K and L lines

The path function from the MCU to the K line is composedof a driver interfacing directly with the MCU through the TXDpin. The TXD pin is CMOS compatible. This driver controls apower transistor which can be turned ON or OFF. When it isON, it pull the DIA pin low. This pin is known as K line in theISO 9141 specification. The DIA pin structure is open collec-tor, without pull up component. This allow the connection ofseveral MC33199 on the K line and the use of a single pullup resistor per system (see fig 6). In order to protect the DIApin against short circuits to Vbat, the device incorporates acurrent limitation (see fig 16) and a thermal shutdown. Thiscurrent limitation will also act when the device drives a K linebus exhibiting large parasitic capacitor value (see Specialfunctionality of I1 pin below).

The path from this DIA pin, or K line, to the MCU is donethrough a comparator. The comparator threshold voltage isconnected to REF-IN-K pin. It can be tied to the REF-OUTvoltage, if the Vbat dependant threshold to be achieved. Thesecond input of this comparator is internally connected toDIA pin. The output of the comparator is available on RXDoutput pin, normally connected to a MCU I/O port. RXD pinhas a 2kOhms internal pull up resistor.

The path from the L line, used during wake-up sequence of

the transmission, to the MCU is done through a second com-parator. The comparator threshold voltage is connected toREF-IN-L pin. As the REF-IN-K pin, it can be tied to the REF-OUT voltage, if the Vbat dependant threshold need to beachieved. The second input of this comparator is internallyconnected to L pin. The output of the comparator is availableon LO output pin, which is an open collector structure. LO isnormally connected to a MCU I/O port.

The DIA, and L pins can sustain up to 38V DC. Careshould be taken for reverse battery protection and transientvoltages higher than 38V.

The DIA and L pins both have internal pull down currentsource of typically 7,5uA (see fig 14). So the L line exhibits a10uA pull down current. The DIA pin has the same behaviourwhen it is in OFF state, that is when TXD is at logic highlevel.

Special functionality of I1 pin

The MC33199D has a unique feature which allow thetransmission Baud rate to be up to 200kBauds. In practice,the K line can be several meters long, and thus can have alarge parasitic capacitor value. This parasitic capacitor valuewill slow down the low to high transition of the K line, andindeed will limit the Baud rate transmission. For the K line togo from low to high level, the parasitic capacitor need to becharged, and it can only be charged by the pull up resistor. Alow pull up resistor value would result in fast charge time ofthe capacitor, but also in large output current, and largepower dissipation in the driver.

To avoid this problem, the MC33199D incorporates adynamic current source, which is temporary activated at thelow to high transition of the TXD pin, that is when the DIA pinor K line should switch from low to high level (see fig 3 & 4).This current source is available at I1 pin. It has a typicalvalue of 80mA. It is activated for 4us (see fig 21 & 22) and isautomatically disabled after this time. During that time it willcharge the K line parasitic capacitor. This extra current willquickly rise the K line voltage up to the Vbat, and will result inreduce rise time on the K line. With this feature theMC33199D can ensure Baud rate transmission of up to200kBauds.

During high to low transition on the K line, the parasiticcapacitor of the bus line will be discharged by the outputtransistor of the DIA pin. In this case, the total current mayexceed the internal current limitation of the DIA pin. If so, thecurrent limitation will act, and discharge current will be lim-ited to typically 60mA (See fig 4 & 16).

If a high Baud rate is necessary, the I1 pin need to be con-nected to the DIA as shown in the typical application fig 5.The I1 pin can also be left open, if the I1 functionality andhigh Baud rate are not suited in the application.

MC33199MOTOROLA

10

MC33199

PIN FUNCTION DESCRIPTION

Pin 1 : Vcc

5V typical power supply pin. Typical supply current is lessthan 1.5mA.

Pin 2 : REF-IN-L

Input reference for C2 comparator. This input can be con-nected directly to REF-OUT, with or without a resistor net-work, or to an external reference.

Pin 3 : REF-IN-K

Input reference for C1 comparator. This input can be con-nected directly to REF-OUT, with or without a resistor net-work, or to an external reference.

Pin 4 : LO

Output of C2 comparator, normally connected to a micro-controller I/O. If L input > (Ref-in-l + Hyst/2) then output LO isin high state. If L< (Ref-in-l - Hyst/2) then output LO is in lowstate, output transistor ON.

This pin is an open collector structure. A Pull up resistorshould be added to Vcc.

Drive capability of this output is 5mA.

Pin 5 : RXD

Receive output, normally connected to a microcontroller I/O.

If DIA input > (Ref-in-l + Hyst/2) then output LO is in highstate.

If DIA < (Ref-in-l - Hyst/2) then output LO is in low state,output transistor ON. This pin has an internal pull up resistorto Vcc (2KΩ typ). Drive capability of this output is 5mAPin 6 : TXD

Transmission input, normally connected to a microcontrol-ler I/O.This pin control DIA output. If Txd is high the outputDIA transistor is OFF. If Txd is low the DIA output transistoris ON.

Pin 9 : DIA

Input / Output Diagnosis Bus line pin. This pin is an opencollector structure, protected against over current and short

circuit to Vbat (Vs). When turning ON (Txd low), this pin willpull the Bus line to Gnd, the current into DIA will be internallylimited to 60mA typ.

The internal power transistor has a thermal shutdown cir-cuit, which forces the DIA output OFF in case of over tem-perature.

DIA is also the C1 comparator input. It is protected againstboth positive and negative over voltage by a 38V zenerdiode. This pin exhibits a constant input current of 7,5µA.Pin 10 : GND

Gnd reference for the entire device.

Pin 11 : I1

Bus source current pin. It is normally tied to DIA pin and tothe Bus line.

At static HIGH or LOW level Txd, the current source I1delivers a current of 3mA (typ). Only during LOW to HIGHtransition, does this current increase to a higher value inorder to charge the key line capacitor (Cl<4nF) in a shorttime (see fig 3 and 4).

Pin 12 : L

Input for C2 comparator. This pin is protected against bothpositive and negative over voltage by a 38V zener diode.This L line is a second independent input. It can be usedfor wake up sequence in ISO diagnosis or as an additionalinput bus line.

This pin exhibits a constant input current of 7.5µA.Pin 13 : VS

12V typical, or Vbat supply pin for the device. This pin isprotected against over voltage transients.

Pin 14 : REF-OUT

Internal reference voltage generator output pin. Its valuedepends on Vs (Vbat) values. This output can be directlyconnected to REF-IN L and REF-IN-K, or through a resistornetwork. Maximum current capability is 50µA.

MC33199MOTOROLA

11

MC33199

Motorola reserves the right to make changes without further notice to any products herein to improve reliability,function or design. Motorola does not assume any liability arising out of the application or use of any product or circuitdescribed herein ; neither does it convert any licence under its patent rights of others. Motorola products are notauthorized for use as components in life support devices or systems intended for surgical implant into the body orintended to support or sustain life. Buyer agrees to notify Motorola of any such intended end use whereupon Motorolashall determine availability and suitability of its products for the use intended. Motorola and are registeredtrademarks of Motorola, Inc. Motorola, Inc. is an Equal Employment opportunity/Affirmative Action Employer.

MC33199MOTOROLA12