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ES5129F Datasheet(PDF) 7 Page - Cyrustek corporation

No. de pieza ES5129F
Descripción Electrónicos  4-1/2 digit with LCD
Download  12 Pages
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Fabricante Electrónico  CYRUSTEK [Cyrustek corporation]
Página de inicio  http://www.cyrustek.com.tw
Logo CYRUSTEK - Cyrustek corporation

ES5129F Datasheet(HTML) 7 Page - Cyrustek corporation

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07/03/01
7
ES5129
4-1/2 digit with LCD
Function Description
1. Normal Operation
When ES5129 operates at the oscillation frequency of 120KHz, the conversion period
will be 500ms. And the less frequency it has, the longer time it takes to complete one
conversion. ES5129 takes input signal from pins IN_LO and IN_HI differentially, and
takes reference from pins REF_LO and REF_HI. The typical reference voltage is about
1V. A filter capacitor and a protective resistor are recommended at IN_HI and IN_LO
terminal as the test circuit of page7.
2. Range Change Function
ES5129 has 2 operation ranges such as 200.00mV and 2.0000V. When the pin RANGE
is pulled to DGND or keep floating, ES5129 operates at 200.00mV full-scale range.
When it is pulled to V+, ES5129 change the input full-scale range to 2.0000V. And the
output data still remain the maximum counting number ±20,000.
3. Data Hold Function
ES5129 support a data hold function to stop the LCD panel upgrading and hold the
final data. When the pin HOLD keeps floating, ES5129 operates in free run mode, and
the data upgrades automatically after every conversion. When it is pulled to V+,
ES5129 enters HOLD mode, the LCD panel stops upgrading the output data, And the
final data before the HOLD mode is activated is held.
4. Decimal Points Controlled
ES5129 can drive 4 decimal points on LCD panel. It provides four pins DP1, DP2, DP3
and DP4 to control the decimal points. Connect these pins DP1~DP4 to V+ will turn on
the relative decimal point. To turn it off, keep DP pin float or connect it to DGND.
5. Continuity
An internal comparator with a 200mV threshold is connected directly between IN_LO
and IN_HI pins. The continuity output will be pulled high whenever the voltage
between the analog inputs is less than 200mV. And the “Continuity” annunciator on
LCD panel will be turned on. To disable the continuity function, connect the pin
continuity to DGND.


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