ES222 datasheet(21/32 Pages) CYRUSTEK

21 / 32 page

ver. 1.2

16/07/12

ES222(9999counts dual)

DMM Analog front end/Inrush

2.7 Capacitance Measurement

MPU send write command to select the capacitance measurement function.

Measurement mode

Read data bytes

Capacitance mode

D0(0:13), D1(0:13)

Note1: D0/D1 both are binary format. SIGN_2 is the sign bit of D1. Capacitance value is D0

Note2: If AD2UPIN=1, D1 data is the ADC result of UDP terminals.

Range control for capacitance mode

Full Scale Range

Relative Resistor

Measurement Period

9.999nF

0.45 sec

99.99nF

OVX pin VR

0.45 sec

999.9nF

1.2 sec max.

9.999uF

R9K / R1K

1.4 sec max.

99.99uF

R9K / R1K

1.4 sec max.

999.9uF

R9K / R1K

2.5 sec max.

9.999mF

R9K / R1K

2.5 sec max.

99.99mF

R9K / R1K

25 sec max.

1Note: The displayed counts in ES222 capacitance mode is recommended to be divided by 10 for range larger

then 1mF. (1000 counts displayed is recommended)

2Note: ALARM bit at capacitance mode is used for increasing the ranging speed. If MPU check the

ALARM=1 at lower range, it could set the next range to 99.99uF directly and the ADC output should be

ignored.

3Note: DISC status bit is used for detection of DUT capacitor voltage. If DISC=1, the internal capacitor

discharging mode is active and the capacitance measurement is inhibited. It is recommended to discharge the

DUT capacitor externally.

4Note: Set C_Clamp=1 to reduce the internal charging current with higher resistance allowed for OVH/OVH1

paths. In this case, OVH1 path could be ignored.

ES222 Datasheet(PDF) 21 Page - Cyrustek corporation

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