EA 9777-2USB ELECTRONIC ASSEMBLY, EA 9777-2USB Datasheet - Page 8

• 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 8
ANALOGUE INPUT AIN1 AND AIN2 (PIN 23+24)
For analogue measurement 2 inputs with a range of 0..VDD are available. Each input is grounded
(GND) and DC impedance is 1MΩ. Please make sure that only positive voltages will be supplied
there. Internal resolution is 10 Bit, equal to a 3-digit DVM modul. Linearity (after adjustment) is around
0.5%.
Adjustment
Analogue inputs are not calibrated when shipped out. A procedure for adjustment may be like that:
1.) Put a well known voltage within a range of 2-VDD to analogue input (example: 3,0V, AIN1)
2.) Run command for calibration (see page 15). Example: „ESC V @ 1 3000“.
Each input query can be done via serial interface or directly shown on display (as digits or bargraph
in various colors and sizes).
Best way for direct visualisation are Process-macros or one of Analogue-macros (e.g. starting at every
voltage change, or above/below a limit).
Both input lines are scaleable from 0 to ±9999.9. Scaling will be done via definition at 2 voltages
„value1=string1;value2=string2“ (see table on page 16).
DIGITAL INPUT AND OUTPUT
The EA eDIP is featured with 8 digital input and 8 digital output lines (CMOS level,
grounded).
8 outputs (Pin 25-32)
Each line can be controlled individually using the „ESC Y W“ command. A
maximum current of 10mA can be switched per line. This give the opportunity to
drive a low power LED in direct way. To source higher current please use an
external transistor.
8 inputs (Pin 33-40)
Each input provides an internal 20..50 kΩ pull-up resistor, so it is possible to connect a key
or switch directly between input and GND. The inputs can be queried and evaluated
directly via the serial interface („ESC Y R“).
In addition to that every port change may start an individual port - or bit- macro (see p. 28).
The command "ESC Y A 1" activates automatic port query. Every alteration of inputs firstly calls bit
macros and afterwards port macros. If there is no definied macro, the new status is transfered into the
send buffer (refer to p. 19).
Note: The logic circuitry is designed for slow operations; in other words, more than 3 changes per
second cannot be easily executed.
EXTENDED OUTPUTS
It is possible to connect 1 to 32 chips like 74HC4094 to the eDIP (OUT1...OUT3), this is why it is
attainable to have 8 to 256 additional outputs. The command "ESC Y E n1 n2 n3" (see p. 17) provides
a comfortable way to control the outputs.
ELECTRONIC ASSEMBLY reserves
the right to change specifications
without prior notice. Printing and
typographical
errors
reserved.