Printing and typographical errors reserved.
ELECTRONIC ASSEMBLY reserves the right to change specifications without prior notice.
Page 8
EA eDIPTFT32-A
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 k
Ω
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.
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 1M
Ω
. 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).
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.
