EA 4110
ZEPPELINSTRASSE 19
·
D- 82205 GILCHING
TEL 08105/778090
·
FAX 08105/778099
·
http://www.lcd-module.de
7.03
3½ DIGIT DVM, SINGLE +5V SUPPLY,
COMMON GROUND
FEATURES
* HIGH CONTRAST 3½ DIGIT LCD
* 4 DIGIT HEIGHTS : 13,18,50 mm
* ACCURACY ±(0.1 % + 1 DIGIT)
* SUPPLY VOLTAGE FROM 3.7V TO 6.5V/2.5mA (L-TYPE ONLY 0.5mA)
* DIFFERENTIAL INPUT, TYPE A AND B: Ri > 100MΩ; TYPE C: Ri = 10MΩ
* 'COMMON GROUND' WITH MEASURING INPUT POSSIBLE
* AUTOZERO, AUTOPOLARITY, OVERFLOW INDICATOR
* DECIMAL POINT SELECTION, ALSO WITH SOLDER STRAPS SETTABLE
* OUTPUT VOLTAGE CA. -5V, LOADABLE WITH 10mA
* OPERATING TEMPERATURE 0 °C TO 55 °C (STORAGE TEMP.-20/+60 °C)
* 10 PIN SOLDERING CONNECTOR OR CONNECTOR PLUG
* VERSION S (WITH STORAGE) INCLUDES DATA HOLDING
OPTIONS
DISPLAY FOR EXTENDED TEMPERATURE RANGE -20 / +80 °C (OPTION -ET)
ELECTROLUMINESCENT BACKLIGHTING (OPTION -LF)
*)
ORDERING INFORMATION
DVM, digit height 13 mm, incl. mounting bezel EA 03 EA 4110-13??
DVM, digit height 18 mm, incl. mounting bezel EA 08-N EA 4110-18??
DVM, digit height 25 mm, incl. mounting bezel EA 011-N
EA 4110-25??
DVM, digit height 50 mm, incl. mounting bezel EA 050-N EA 4110-50??
Wondering about question-marks? Here’s how to specify your needs (??)
A/D converter, standard type (2.5mA), measuring range ± 200 mV NA
± 2V NB
± 20 V NC
A/D converter, low power type (0.5mA), measuring range ± 200 mV LA
± 2V LB
± 20 V LC
A/D converter, storage type (2.5mA), measuring range ± 200 mV SA
± 2V SB
± 20 V SC
*) additional EL inverter circuit needed (e.g. EA PSEL-1003)
Available display options : opt.-LF,-ET,-LFET
2
EA 4110
SPECIAL FEATURE
The modules of the EA 4110 series are supplied with an internal DC/DC converter which converts
the supply voltage (typ.+5V) into a negative voltage of nearly the same amount (typ.-4.9V). This
enables one common ground (GND) between the measuring inputs and the supply voltage.
1. SUPPLY VOLTAGE (PIN 1,2) VDD,GND
Relating to GND, the supply voltage is +5V nominal (range from +3.7V to +6.5V).
2. NEGATIVE OUTPUT VOLTAGE (PIN 5) VSS
This voltage is of nearly the same amount as VDD (VDD-O.1V) and can be loaded externally with max.
10mA to supply e.g. a preamplifier. The internal output resistance is 70 Ω.
3. DIFFERENTIAL INPUTS (PIN 3,4) INH,INL
These inputs can accept differential voltages according to the measuring ranges of the modules (A
= ± 200mV, B = ± 2V, C = ± 20V). Note that the reference potential of both inputs must lie within the
following limits. These are VDD - 0.5V and VSS + 1V. Special note for type C : Because of the applied
scaling resistor (1:10) only INH may lie at higher potential, the maximum is ± 20V.
4. DECIMAL POINT SELECTION (PIN 6,7,8) DP1,DP2,DP3
The decimal points can be selected by connection to VDD or by solder straps on the solder side of
the board. If unrequired they are internally connected to LO via 1MΩ pull-downs and not visible.
5. TEST AND DIGITAL GROUND (PIN 9) TST
a) By connecting Tst with VDD you are able to test the display’s segments as -1888 is shown for a
short time. Note that prolonged connection may damage the display (‘burn-in’).
b) This pin represents also digital ground for decimal point selection and the hold input. DGND is held
at about 5V below VDD (Zener diode stabilization), but independent from GND (0V) !
6. DISPLAY HOLD (PIN 10) HO (S-VERSION ONLY)
By connecting to VDD the least measured value is held on the display, otherwise it is connected via
a 70 kΩ pull-down to Tst and the actual value is displayed. On versions L and N this pin is connected
additionally with VDD.
7. LOW BATTERY INDICATOR
The switching threshold of this indicator is set to about 3.7V (GND - VDD) is recommended to avoid
errors which may occur when the total voltage is less than 7V (VSS - VDD).
8. OVERFLOW
If it happens to be there an overflow (value > ± 1999) only the figure ‘1’ and (if negative) it’s sign is
displayed on the left side.
9. SOLDER STRAPS LB1,LB2 (REVERSE SIDE OF THE MODULE)
There are two possibilities supplying the measuring input INL with it’s reference potential using solder
straps :
a) Connect INL with COM (internal analogue ground = VDD - 2.8V).
b) Connect INL with GND (power supply common = 0V).
GND
COM INL
LB2
LB1