TH3044.2A Ver la hoja de datos (PDF) - Melexis Microelectronic Systems

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TH3044.2A

K-Bus Interface

Melexis Microelectronic Systems  

TH3044

K-Bus Interface

RxD

NRxD

TxD

SEN/STA

POR

VBAT

VCC

POR

VCC

ESD

VCC

ESD

tDEB

Control-

logic

Bit-Compare

Constant-Low

OSC

Vref

Biasing

VthH

VthL

pnp-

Control

- slew rate

- IB

- foldback

Figure 1 - Block Diagram

BUS

The TH3044 is used as a K-Bus interface. It

builds the connection between the serial 5V

bus line and the 12 V bus line. To avoid losses

of data informations control functions are

implemented.

Transmit

During the transmission the data at the pin

TxD will be transferred to the pin RxD (NRxD)

as well as to the pin BUS.

Receive

The receiving path is always transparent.

Independent of the mode the pin RxD and

NRxD (inverted) are related to signal at the pin

BUS. Voltage spikes on the bus signal are

sup-pressed by the implemented debouncing

circuit.

BUS

SEN/STA

TxD

RxD

< tdebH

< tdebL

tdebH

tdebL

BUS

To minimise the electromagnetic emission of

the bus line, the slew rate of the rising and

falling edges of the data signals are limited.

3901003044

Rev. 003

Page 5

Nov/02

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