ES51970(6000counts)
DMM Analog front end with Inrush
2.5 Capacitance Measurement
MPU send write command to select the capacitance measurement function.
F3
F2
F1
F0
Measurement mode
Read data bytes
D0(0:18)
1
0
0
0
Capacitance mode
Note1: D0 is binary format. ASIGN bit is ignored.
Range control for capacitance mode
Measurement Period
0.5 sec
Q2
0
0
0
0
1
1
1
1
Q1
0
0
1
1
0
0
1
1
Q0
0
1
0
1
0
1
0
1
Full Scale Range Relative Resistor
6.000nF
60.00nF
600.0nF
6.000uF
60.00uF
600.0uF
6.000mF
60.00mF
-
0.5 sec
1.25 sec
OVX pin VR
-
0.4 sec max.
0.5 sec max.
1.0 sec max.
1.35 sec max.
6.75 sec max.
R9K / R1K
R9K / R1K
R9K / R1K
R9K / R1K
R9K / R1K
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 6.000uF directly
and the ADC output should be ignored.
STA0 status bit is used for detection of DUT capacitor voltage. If STA0=1, the internal
capacitor discharging mode is active and the capacitance measurement is inhibited. It is
recommended to discharge the DUT capacitor externally.
2.6 Continuity Check measurement
MPU send write command to select the continuity measurement function.
F3
F2
F1
F0
Measurement mode
Read data bytes
D0(0:18), D1(0:9)
0
1
0
1
Continuity mode
Note1: D0/D1 both are binary format. ASIGN/BSIGN bits both are ignored.
Continuity mode shares the same configuration with 600.0Ω resistance measurement circuit
and support the low-resistance detection. If the STBEEP output (pin64) is low, it means the
low-resistance status is detected (It means the OVX terminal voltage less than -7mV). It
could be faster than the FADC result, so MPU could monitor the STBEEP output and FADC
(D1) data output make the high speed detection for short circuit detection. Set SHBP=1 to
enable the built-in buzzer driving automatically when STBEEP is active.
ver. 2.8
17
12/01/12
CYRUSTEK [ Cyrustek corporation ]
