Datasheet

EA eDIPTFT70-A
Page 7
ELECTRONIC ASSEMBLY reserves
the right to change specifications
without prior notice. Printing and
typographical errors reserved.
I²C-BUS INTERFACE
If the display is wired as shown
below, it can be operated directly to
the 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.
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 BA0..2, SA0..2, 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.
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 0 001
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 1 001
H H L $B0 1 0 1 1
H H H $D0 1 1 0 1
Applikationsbeispiel
Pinout eDIPTFT70-A: I2C mode
Pin Symbol In/Out Function Pin Symbol In/Out Function
1 GND Ground Potential for logic (0V) 25
N.C. do not connect, reserved
2 VDD Power supply for logic (+5V) 26
3 SND+ Speaker LS1 (Impedance 8 Ohm) 27
4 SND- Speaker LS2 28
5 RESET In L: Reset 29 GND Ground (=Pin 1)
6 BA0 In Basic Address 0 30 VDD Power supply (=Pin 2)
7 BA1 In Basic Address 1 31 AIN1
In
analogue input 0..VDD
DC impedance 1MOhm
8 SA0 In Slave Address 0 32 AIN2
9 SA1 In Slave Address 1 33 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)
10 SA2 In Slave Address 2 34 OUT2 / MO7
11 BA2 In Basic Address 2 35 OUT3 / MO6
12 I2CMOD In connect to GND for I²C interface 36 OUT4 / MO5
13 DPOM In
L: disable PowerOnMacro
do not connect for normal operation
37 OUT5 / MO4
14 SDA Bidir. Serial Data Line 38 OUT6 / MO3
15 SCL In Serial Clock Line 39 OUT7 / MO2
16 BUZZ Out Buzzer output 40 OUT8 / MO1
17 DPROT In
L: Disable Smallprotokoll
do not connect for normal operation
41 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)
18 DNC Out L: internal, do not connect 42 IN2 / MI7
19 WP In L: Writeprotect for DataFlash 43 IN3 / MI6
20
TEST
SBUF
IN
Out
open-drain with internal pullup 20..50k
IN (Power-On) L: Testmode
OUT L: data in sendbuffer
44 IN4 / MI5
21
N.C. do not connect, reserved
45 IN5 / MI4
22 46 IN6 / MI3
23 47 IN7 / MI2
24 48 IN8 / MI1
application example