ES51955(5000counts)
Dual Display/Inrush
2.
Operating Modes
2.1. Semi-auto calibration scheme
ES51955 includes DMM & CLAMP_ON meter features in single chip. DMM
manufacturers need the calibration process in production. The traditional solution needs the
variable resistors for calibration by manual adjustment. ES51955 provide another
calibration scheme and the variable resistors could be ignored. When ES51955 is at
OFF-state, pull
CAL_EN
(pin 60) to V- to active the calibration scheme after re-power on. A
digital controlled voltage output will be active from DAC_AO & DAC_VO. When
semi-auto calibration scheme is active, use
HOLD
(or
BKLIT)
key to decrease voltage and
use
RANGE
key to increase the voltage. Decrease the reference voltage means the counts
on display will be increased. Increase the reference voltage means the counts on display will
be decreased. The adjustment step is approximate one count. If coarse adjustment is
required, push
HOLD
(or
BKLIT)
and
RANGE
larger than one second to speed up to
approximate 30 counts per second. After calibration process is finished, push
HOLD
(or
BKLIT)
and
RANGE
(less than one second) simultaneously to save the digital control code
to external EEPROM (24C02).
HOLD or BKLIT
Display Count Up
Display Count Down
RANGE
HOLD + RANGE
BKLIT + RANGE
Save Calibration data to EEPROM
EEPROM
v2.3
9
10/06/25
CYRUSTEK [ Cyrustek corporation ]
