EA 9777-2USB ELECTRONIC ASSEMBLY, EA 9777-2USB Datasheet - Page 7

• Manufacturer Part Number: EA 9777-2USB
• Description: Display Development Tools Eval Board USB For Windows OS
• Manufacturer: ELECTRONIC ASSEMBLY

Specifications of EA 9777-2USB

• Product Category: Display Development Tools
• Rohs: yes
• Product: Evaluation Boards
• Tool Is For Evaluation Of: 3.2 in TFT Displays
• Interface Type: USB
• Operating Supply Voltage: 3.3 V, 5 V
• Description/function: Evaluation Board for USB
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 20 C
• Viewing Area: 3.2 in

ELECTRONIC ASSEMBLY reserves
the right to change specifications
without prior notice. Printing and
typographical
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.
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).
errors
reserved.
Pin Symbol In/Out Function
10
11
12 I2CMO
13 DPOM
14
15
16
17 DPROT
18
19
20
1
2
3
4
5
6
7
8
9
RESET
BUZZ
TEST
SBUF
GND
VDD
SDA
DNC
BA0
BA1
SA0
SA1
SA2
BA2
SCL
WP
NC
NC
Bidir. Serial Data Line
Out
Out
Out
IN
In
In
In
In
In
In
In
In
In
In
In
In
Ground Potential for logic (0V)
Power supply for logic (+3,3V ... +5V)
do not connect
do not connect
L: Reset
Basic Address 0
Basic Address 1
Slave Address 0
Slave Address 1
Slave Address 2
Basic Address 2
connect to GND for I²C interface
L: disable PowerOnMacro
do not connect for normal operation
Serial Clock Line
Buzzer output
L: Disable Smallprotokoll
do not connect for normal operation
L: internal, do not connect
L: Writeprotect for DataFlash
open-drain with internal pullup 20..50k
IN (Power-On) L: Testmode
OUT L: data in sendbuffer
Pinout eDIPTFT32-A: I2C mode
BA2 BA1 BA0
L
L
L
L
H
H
H
H
Pin 11,7,6
Pin
H
H
H
H
L
L
L
L
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
H
H
H
H
OUT1 / MO8
OUT2 / MO7
OUT3 / MO6
OUT4 / MO5
OUT5 / MO4
OUT6 / MO3
OUT7 / MO2
OUT8 / MO1
L
L
L
L
EA eDIPTFT32-A
IN1 / MI8
IN2 / MI7
IN3 / MI6
IN4 / MI5
IN5 / MI4
IN6 / MI3
IN7 / MI2
IN8 / MI1
Symbol
AIN1
AIN2
GND
VDD
address
Base
$10
$20
$30
$40
$70
$90
$B0
$D0
I²C - Address
In/Out Function
Out
In
In
D7
application example
0
0
0
0
0
1
1
1
all pins open: Write $DE
Ground (=Pin 1)
Power supply (=Pin 2)
analogue input 0..VDD
DC impedance 1MOhm
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)
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)
D6
0
0
0
1
1
0
0
1
D5
0
1
1
0
1
0
1
0
I²C address
D4
1
0
1
0
1
1
1
1
D3
S
A
2
Read $DF
D2
S
A
1
Page 7
D1
S
A
0
W
D0
R