ES51945(5000counts)
Dual Display/No Cap
where Fosc is the frequency of the crystal oscillator. Thus, the counter has a 1-second time
base when a 4MHz oscillator is used. The frequency counter can select the proper range
automatically or manually. Auto-range operation extends over seven decades, from 500.0Hz
to 50.00MHz. The following table summarizes the full-scale range of the frequency counter.
Configuration
FR1
Full Scale range
500.0Hz
FR2
FR3
FR4
FR5
5.000KHz
50.00KHz
500.0KHz
5.000MHz
50.00MHz
FR6
*If input frequency is less than 5.0Hz, ES51945 will show 0.0Hz
2.8 Duty Cycle measurement
The duty cycle measurement is available in frequency mode simultaneously. The duty cycle
mode range is available within 5.0% to 95.0% (< 10kHz@3Vpp). The minimum resolution
is 0.1%. If the source frequency duty cycle is smaller than 1.0%, the 0.0% will be shown on
the LCD display. If the duty cycle is larger than 98.9%, the OL will be shown on the LCD
sub-display. When the frequency is zero, the duty cycle display will be 0.0%.
FREQ + Duty cycle
5 0.0 %
AUTO
4.0 0 0MHz
2.9 Temperature measurement mode
Temperature measurement mode takes input signal from ADP pin and reference
voltage from VA-. ES51945 has a built-in ºC-to-ºF scale translation circuit, and only needs
an external ºC scale application circuit. The application circuit for ºF scale is not required.
v2.3
14
10/06/25
CYRUSTEK [ Cyrustek corporation ]
