ES51993
11,000 Counts ADC
4. Special function
4.1 Peak Hold
ES51993 provide a Peak Hold function to capture the REAL peak value for voltage or
current measurement mode. In a case of a 1V sine wave input voltage, the Peak Hold
function gets a PMAX value of 1.414V and PMIN value of –1.414V. Set the bit PEAK
of STATUS byte3 to high to force the ES51993 enter PEAK mode.. In the PEAK mode,
ES51993 takes high input from PHin and low input from AGND. Peak Hold function is
divided into two parts of peak maximum and peak minimum conversion. ES51993
performs peak maximum and peak minimum conversion by turns, not at the same time.
The bit PMAX and PMIN of STATUS Byte2 present which type the peak value is.
4.2 Peak Calibration
In PEAK mode, the offset voltage of internal OP Amps will cause an error. To obtain a
more accurate value, this offset effect must be canceled. ES51993 provides the Peak
Calibration feature to remove the influence on accuracy by internal offset voltage. Set
the bit PCAL of STATUS Byte2 to high to enter Peak Calibration mode. In this mode,
ES51993 will output the calibration value of peak maximum and minimum conversion
by turns. The calibration value is the error rise from offset voltage, and it muse be
recorded. In PEAK mode, the peak value must minus the calibration value to remove
the error.
Note:
1. After entering Peak or PCAL mode, it is recommended to leave the Peak or PCAL
mode first. Then wait one conversion time delay before change mode to PCAL or
Peak mode, respectively. The time delay is necessary for normalizing the charge of
PMAX/PMIN capacitor.
2. When buzzer control bit is active, the Peak & PCAL mode are not allowed.
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06/09/20
CYRUSTEK [ Cyrustek corporation ]
