EA 9777-2USB ELECTRONIC ASSEMBLY, EA 9777-2USB Datasheet - Page 4

• 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

EA eDIPTFT32-A
Page 4
RS-232 INTERFACE
If the display is wired as shown
below, the RS-232 interface is
selected. The pin assignment is
specified in the table on the right.
The RxD and TxD lines lead
CMOS
microcontroller, for example, for
direct connection.
If “genuine” RS-232 levels are
required (e.g. for connection to a
PC), an external level converter
(e.g. MAX232) is required.
BAUD RATES
The baud rate is set by means of pins 6, 7 and 8 (baud 0 to 2). The data
format is set permanently to 8 data bits, 1 stop bit, no parity.
RTS/CTS handshake lines are not required. The required control is
taken over by the integrated software protocol (see pages 10 and 11).
level
(VDD)
to
a
Pin Symbol In/Out Function
10
11
12
13
14
15
16
17 DPROT
18
19
20
1
2
3
4
5
6
7
8
9
BAUD0
BAUD1
BAUD2
RESET
EN485
DPOM
ADR0
ADR1
ADR2
BUZZ
SBUF
TEST
GND
VDD
DNC
RxD
TxD
WP
NC
NC
Out
Out
Out
Out
Out
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
Baud Rate 0
Baud Rate 1
Baud Rate 2
Address 0 for RS-485
Receive Data
Transmit Data
Transmit Enable for RS-485 driver
L: disable PowerOnMacro
do not connect for normal operation
Address 1 for RS-485
Address 2 for RS-485
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
application example
Pinout eDIPTFT32-A: RS-232/RS-485 mode
Note:
The pins BAUD 0 to 2, ADR 0 to 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.
For RS232 operation (without
addressing) the pins ADR 0 to ADR 2
must be left open.
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.
Pin
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Baud0 Baud1 Baud2
OUT1 / MO8
OUT2 / MO7
OUT3 / MO6
OUT4 / MO5
OUT5 / MO4
OUT6 / MO3
OUT7 / MO2
OUT8 / MO1
ELECTRONIC ASSEMBLY reserves
the right to change specifications
without prior notice. Printing and
typographical
1
0
1
0
1
0
1
0
IN1 / MI8
IN2 / MI7
IN3 / MI6
IN4 / MI5
IN5 / MI4
IN6 / MI3
IN7 / MI2
IN8 / MI1
Symbol
GND
AIN1
AIN2
VDD
0
1
1
0
0
1
1
0
Baud Rates
In/Out Function
Out
In
In
0
0
0
1
1
1
1
0
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)
errors
data format
115200
230400
19200
38400
57600
8,N,1
2400
4800
9600
reserved.