MC33199D 查看數據表（PDF） - Motorola => Freescale

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MC33199D

Automotive ISO 9141 Serial Link Driver

Motorola => Freescale 

MC33199

PIN FUNCTION DESCRIPTION

Pin 1 : Vcc

5V typical power supply pin. Typical supply current is less

than 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 is

in high state. If L< (Ref-in-l - Hyst/2) then output LO is in low

state, output transistor ON.

This pin is an open collector structure. A Pull up resistor

should 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 high

state.

If DIA < (Ref-in-l - Hyst/2) then output LO is in low state,

output transistor ON. This pin has an internal pull up resistor

to Vcc (2KΩ typ). Drive capability of this output is 5mA

Pin 6 : TXD

Transmission input, normally connected to a microcontrol-

ler I/O.This pin control DIA output. If Txd is high the output

DIA transistor is OFF. If Txd is low the DIA output transistor

is ON.

Pin 9 : DIA

Input / Output Diagnosis Bus line pin. This pin is an open

collector structure, protected against over current and short

circuit to Vbat (Vs). When turning ON (Txd low), this pin will

pull the Bus line to Gnd, the current into DIA will be internally

limited 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 against

both positive and negative over voltage by a 38V zener

diode. 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 to

the Bus line.

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 key line capacitor (Cl<4nF) in a short

time (see fig 3 and 4).

Pin 12 : L

Input for C2 comparator. This pin is protected against both

positive and negative over voltage by a 38V zener diode.

This L line is a second independent input. It can be used

for wake up sequence in ISO diagnosis or as an additional

input 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 is

protected against over voltage transients.

Pin 14 : REF-OUT

Internal reference voltage generator output pin. Its value

depends on Vs (Vbat) values. This output can be directly

connected to REF-IN L and REF-IN-K, or through a resistor

network. Maximum current capability is 50µA.

MC33199

MOTOROLA

11

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