EAeDIPTFT32-A

Page 7

ELECTRONIC ASSEMBLY reserves

the right to change specifications

without prior notice. Printing and

typographical

errors

reserved.

application example

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

maintained between the

individual bytes during

transfer, a byte can be

transferred at up to 400 kHz.

DATA TRANSFER 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).

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.

Pinout eDIPTFT32-A: I2C mode

Pin Symbol In/Out Function

Pin

Symbol

In/Out Function

1

GND

Ground Potential for logic (0V)

21

GND

Ground (=Pin 1)

2

VDD

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

22

VDD

Power supply (=Pin 2)

3

NC

do not connect

23

AIN1

In

analogue input 0..VDD

DC impedance 1MOhm

4

NC

do not connect

24

AIN2

5

RESET

In

L: Reset

25

OUT1 / MO8

Out

8 digital outputs

maximum current:

IOL = IOH = 10mA

alternativ up to 8 matrix

keyboard output lines

(reduces the digital

output lines, see chapter

external keyboard)

6

BA0

In

Basic Address 0

26

OUT2 / MO7

7

BA1

In

Basic Address 1

27

OUT3 / MO6

8

SA0

In

Slave Address 0

28

OUT4 / MO5

9

SA1

In

Slave Address 1

29

OUT5 / MO4

10

SA2

In

Slave Address 2

30

OUT6 / MO3

11

BA2

In

Basic Address 2

31

OUT7 / MO2

12 I2CMO

In

connect to GND for I²C interface

32

OUT8 / MO1

13

DPOM

In

L: disable PowerOnMacro

do not connect for normal operation

33

IN1 / MI8

In

8 digital inputs

open-drain with internal

pullup 20..50k

alternativ up to 8 matrix

keyboard input lines

(reduces the digital input

lines, see chapter

external keyboard)

14

SDA

Bidir. Serial Data Line

34

IN2 / MI7

15

SCL

In

Serial Clock Line

35

IN3 / MI6

16

BUZZ

Out

Buzzer output

36

IN4 / MI5

17 DPROT

In

L: Disable Smallprotokoll

do not connect for normal operation

37

IN5 / MI4

18

DNC

Out

L: internal, do not connect

38

IN6 / MI3

19

WP

In

L: Writeprotect for DataFlash

39

IN7 / MI2

20

TEST

SBUF

IN

Out

open-drain with internal pullup 20..50k

IN (Power-On) L: Testmode

OUT L: data in sendbuffer

40

IN8 / MI1

all pins open: Write $DE

Read $DF

I²C - Address

Pin 11,7,6

Base

address

I²C address

BA2 BA1 BA0

D7

D6

D5

D4

D3

D2

D1

D0

L

LL

$10

0

00

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

0

1

1

L

H

H

$40

0

1

0

0

H

L

L

$70

0

1

1

1

H

LH

$90

1

00

1

H

H

L

$B0

1

0

1

1

H

H

H

$D0

1

1

0

1