EAeDIP128-6

Page 7

ELECTRONIC ASSEMBLY reserves

the right to change specifications

without prior notice. Printing and

typographical

errors

reserved.

I²C - Address

Pin 11,7,6

Base

address

I²C address

BA2 BA1 BA0

D7

D6

D5

D4

D3

D2

D1

D0

L

L

L

$10

0

0

0

1

S

A

2

S

A

1

S

A

0

R

W

L

L

H

$20

0

0

1

0

L

H

L

$30

0

01

1

L

H

H

$40

0

10

0

H

L

L

$70

0

1

1

1

H

L

H

$90

1

0

0

1

H

H

L

$B0

1

0

1

1

H

H

H

$D0

1

1

0

1

Pinout eDIP128-6: I2C mode

Pin Symbol In/Out Function

Pin

Symbol

In/Out Function

1

GND

Ground Potential for logic (0V)

17

DPROT

In

L: Disable Smallprotokoll

do not connect for normal operation

2

VDD

Power supply for logic (+5V)

18

PWR

Out

L: Normal Operation

H: Powerdownmode

3

NC

do not connect

19

NC

do not connect

4

NC

do not connect

20

TEST

SBUF

In

Out

open-drain with internal pullup 20k..50k

IN (Power-On) L: Testmode

OUT L: data in sendbuffer

5

RESET

In

L: Reset

21

GND

Ground (0V)

6

BA0

In

Basic Address 0

22

VDD

Power supply (+3,3..5V)

7

BA1

In

Basic Address 1

23

NC

do not connect

8

SA0

In

Slave Address 0

24

NC

do not connect

9

SA1

In

Slave Address 1

25

IN8/OUT1

8 digital inputs

(internal 20k..50k pullup)

alternativ up to 8 digital outputs

maximum current:

IOL = IOH = 10mA

10

SA2

In

Slave Address 2

26

IN7/OUT2

11

BA2

In

Basic Address 2

27

IN6/OUT3

12 I2CMOD

In

connect to GND for I²C interface

28

IN5/OUT4

13

WUP

In

L: (Power-On) disable Power-On-Macro

L: Wakeup from Powerdownmode

29

IN4/OUT5

14

SDA

Bidir. Serial Data Line

30

IN3/OUT6

15

SCL

In

Serial Clock Line

31

IN2/OUT7

16

BUZZ

Out

Buzzer output

32

IN1/OUT8

Application note

I²C-BUS INTERFACE

If the display is wired as shown

below, it can be operated directly

on an I²C bus.

8 different base addresses and 8

slave addresses can be selected

on the display.

Data transfer is possible at up to

100 kHz. However, if pauses of at

least 100 µs are maintained

between the individual bytes

during transfer, a byte can be

transferred at up to 400 kHz.

Note:

The pins DORD, CPOL, CPHA, DPOM, DPROT and TEST/SBUF have an internal pullup, which is why only the LO level

(0=GND) is to be actively applied. These pins must be left open for a hi level.

On pin 20 (SBUF) the display indicates with a low level that data is ready to be retrieved from the internal send buffer.

The line can be connected to an interrupt input of the host system, for example..

DATATRANSFER I²C INTERFACE

principle I2C-bus transfer:

- I²C-Start

- Master-Transmit: EA eDIP-I²C-address (e.g. $DE), send smallprotocol package (data)

- I²C-Stop

- I²C-Start

- Master-Read: EA eDIP-I²C-Address (e.g. $DF), read ACK-byte and opt. smallprotocoll package (data)

- I²C-Stop

Read operation: for internal operation the EA

eDIP does need a short time before providing

the data; therefore a short pause of min. 6µs is

needed for each byte (no activity of SCL line).

all pins open: Write $DE

Read $DF