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TH3044JDC

K-Bus Interface

Melexis Microelectronic Systems  

Functional Diagram

TH3044

K-Bus Interface

RxD

NRxD

TxD

POR

VBAT

VCC POR

VCC

ESD

VCC

SEN/STA

ESD

tDEB

Control-

logic

Bit-Compare

Constant-Low

OSC

Vref

Biasing

VthH

VthL

pnp-

Control

- slew rate

- IB

- foldback

BUS

Figure 1 - Block Diagram

Functional Description

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.

Datasheet Rev 1.1 July 2001

Page 5

www.melexis.com

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