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Elmos Semiconductor AG

Data Sheet

QM-No.: 25DS0046E.03

PRODUCTION DATA - JAN 15, 2015

Elmos Semiconductor AG reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.

KNX/ EIB TRANSCEIVER

E981.03

4.3 Full Normal Mode Application

Figure 3. Schematic Example (full application)

DC/DC converter active (3.3 V/5 V): I

SETVCC = GND:

VCC = 3 V

SETVCC = VIO:

VCC = 5 V

BS1 = BS0 = GND:

UART 19.2 k baud

V20 used:

additional C

I

UART optional with optical coupler

SPI optional with optical coupler

In Normal Mode alarm functionality is usable. Alarm is detected in case of an open SETVCC pin.

For other schematics read application notes.

OTEMP used

optional with optocoupler

WK used

optional with optocoupler

SAVE used

optional with optocoupler

RESET used

optional with optocoupler

AOUT used

optional with insulation

amplifier for analog Signal

Typical Application Circuit **1

CREC

RTXH

RTXL

BUSN

EXTAL

XTAL

GND

RXD

TXD

VIO

SET_VCC

E981.03

BUS

Coupling

Module

VCC

TP1-256

+ -

V33I

VST

SW

VCC

V20

20V

Q

Functional Diagram **2

(5) SETVCC

E981.03

(2) RESET

(1) OTEMP

clock

system

KNX / EIB

Interface

UART host

interface

(12) BUSP

(8) CREC

(11) RTXH

(10) RTXL

(9) BUSN

(23) EXTAL

(24) XTAL

(27) GND

(26) RXD

(25) TXD

(19) VIO

(31) MISO / GPIO

(30) MOSI / GPIO

(29) SCK / GPI

(28) SCS / GPI

SPI host

interface

(3) i.c.

(13) i.c.

IC supply

IC start-up

20V

Supply

Current

Limiter

ADC/DAC

Internal

Logic

(21) BS1

(20) BS0

(32) SAVE

(4) AOUT

Monitoring

Unit

(22) INT

Mode

Control

(7) WK / GPI

Switched

Power supply

(6)

V33I

(15)

VST

(17)

SW

VCC

(14)

V20

(16) i.c.

(18)

VCC

V20

+ -

Q

TP1-256

+ -

Minimal Function of E981.03 **3

BUS

Coupling

Module

Application

Module

Q

(50mA)

Q

GND

SCS

SCK

MISO

MOSI

TXD

RXD

33

V20

VST

i.c.

BUSN

RTXL

RTXH

BUSP

16

15

14

13

12

11

10

9

25

26

27

28

29

30

31

32

GND

MOSI

TXD

33

i.c.

E981.03

RTXL

16

15

14

13

12

11

10

9

25

26

27

28

29

30

31

32

SAVE

IC1

Full Normal Mode Application **4

BUS

Coupling

Module

V

VIO

GPIO

Analog IN

GPIO / ResetN

GPIO

GPIO

VCC= 3.3V

VCC= 5V

OPEN= Alarm

GPIO

Q

SETVCC=GND

GND

SCS

SCK

MISO

MOSI

TXD

RXD

33

V20

VST

i.c.

BUSN

RTXL

RTXH

BUSP

16

15

14

13

12

11

10

9

25

26

27

28

29

30

31

32

GND

MOSI

TXD

33

i.c.

E981.03

RTXL

16

15

14

13

12

11

10

9

25

26

27

28

29

30

31

32

SAVE

IC1