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TH3044JDC

K-Bus Interface

Melexis Microelectronic Systems  

TH3044

K-Bus Interface

Application Information

Connecting Supply Pin’s

Connecting VBAT, VCC and GND in random

sequence does not cause damaging of the

device. The absence of VBAT-, VCC- or GND-

connection either alone or in any combination

does not influence or disturb the bus.

Reset

The pin BUS remains in tri-state, until internal

RESET state is released.

Reverse Protection

To protect the TH3044 from reverse voltages,

evers protection diode needs to be connected

to pin VBAT.

EMC Filter

In order to minimise EMC radiation a LC filter

(22 mH, 100 pF) is recommended. As an

option a RC filter (10 Ω, 100 pF) can be also

used.

Application Circuit

MCU

VBat

TH3044

VBAT

SEN/STA

100n

2.2u

BUS pullups

Rpu > 350Ω

VBat

TH3044

TH3044

TH3044

TH3044

TxD

RxD

NRxD

BUS

VCC

GND

22uH

100p

100p...220p

EMC Filter

optinal

for improving ESD

Performance

100n

10Ω

100p

optinal

RC-EMC Filter

Datasheet Rev 1.1 July 2001

Page 7

www.melexis.com

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