FS9922-DMM3 datasheet(5/35 Pages) FORTUNE

5 / 35 page

FS9922-DMM3

Rev. 1.1

5/35

General Description

FS9922-DMM3 is a high performance, low power consumption and 3 4/5 digits (4000 Counts) dual

Analog to Digital Converter with a built-in microprocessor. It includes a 8 bits microprocessor, low noise

and the OPAMP of high stability, AC rectifier OPAMP, voltage doubling and regulated voltage, highly

regulated bandgap, auto measurement switch and function control circuit, buzzer driver circuit, clock

oscillation circuit, backlight display control circuit, LCD driver circuit and so on.

Built-in dual Analog to Digital Converter , one is a high accuracy ADC for main measurement; the

other is a high speed ADC whose measurement result shows by a 41 segment analog section bar that

can respond fast, the analog indication owns the property of immediate response and can provide the

fast measurement and monitoring of instant signals.

With the microprocessor, FS9922-DMM3 can do the logic function control via the I/O ports. By

selecting the codes of MEA1〜MEA5 pins can realize various functions during measurement.

By triggering the keys of the settings of SELECT, RANGE, REL/RS232, HZ/DUTY, HOLD/LIGHT,

MAX/MIN keys, you can realize the functions of function switch, measurement mode select, relative

value measurement, frequency/duty cycle measurement, reading hold, MAX/MIN value hold, backlight

display, RS232 output and so on.

With the auto power off function, when there is no action on the mode switch

or keys of the meter

within 15 minutes, the system will enter into the sleep mode automatically to save the power.

This

function can also be cancelled during use.

FS9922-DMM3 has LCD driver circuits, which is designed for driving LCD.

FS9922-DMM3 is made by the large integrated circuit technology, and therefore greatly rises up the

reliability of the product.

It makes the design simple, the volume small, low power consumption by

using 3V power source, and convenient to use the power supply of battery, especially suitable for the

application on the palm mode meter.

FS9922-DMM3 is a microprocessor-embedded and multifunctional measuring dual ADC; fewer

external components added can form a high accuracy, multifunctional and low cost measuring meter.

Features

Max. Display:

4000 Counts (Frequency 9999), Bar graph 41 segments.

Converter Rate:

3 times/sec; Bar graph: 30 times/sec.

Measuring Mode:

Fully Auto/Manual measurement.

Pole Indication: Auto.

Operation Voltage: 2.4V~3.6V。

Operation Current:

≤2mA

Low Power Indication:

about 2.4V。

Buzzer Frequency:

about 2.7kHz。

AC Rectifying:

Embedded OPAMP。

Current Resistance:

μA is 50Ω; mA is 0.5Ω; A is 0.005Ω。

Function Keys:

SELECT, RANGE, REL/ RS232, HZ/DUTY, HOLD/ LIGHT, MAX/MIN。

Data Output:

RS232 (2400bps )。

Auto Power-off:

15min.（can be cancelled.）

。

Unit Symbol and Backlight Display。

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