ES51998(60000counts)
DMM Analog front end/Insulation
Frequency range control for ACA+Hz(%) mode
FQ2 FQ1 FQ0 Full Scale Range
0
0
0
0
0
0
1
1
0
1
0
1
60.00Hz
600.0Hz
6.000kHz
60.00kHz
20% ~ 80%
Duty Cycle
Note: See frequency mode (section 2.8) also.
2.3 Low pass filter (LPF) mode for ACA/ACV mode
A 3rd order low pass filter with is built in ES51998. The 3dB bandwidth of the low pass
filter could be selectable by MPU. The LPF mode is active when the LPF control bit is set
to be active. When PEAK mode is active, the LPF mode will be disabled temporarily until
the PEAK mode is cancelled.
The LPF mode is allowed to be enabled in F + duty mode to reject high-frequency noise
for sine wave input, but the 3dB will be fixed at 10kHz only.
LPF1
LPF0
Low pass filter effect
Disable
0
0
1
1
0
1
0
1
3dB = 1kHz
3dB = 10kHz
3dB > 100kHz
2.4 Resistance/Conductance Measurement
MPU send write command to select the resistance measurement function. When RP=1, the
command to select the conductance mode.
F3
F2
F1
F0
Measurement mode
Read data bytes
D0(0:18), D1(0:9)
0
1
0
0
Resistance mode
Note1: D0/D1 both are binary format. ASIGN/BSIGN bits are ignored. When RP=1, the D1 data should
be ignored.
Range control for resistance mode (RP=0)
Q2 Q1 Q0 Full Scale Range
Relative Resistor
OR1
Equivalent value
100Ω
0
0
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
600.00Ω
6.0000KΩ
60.000KΩ
600.00KΩ
6.0000MΩ
60.000MΩ
VR5
1KΩ
10KΩ
100KΩ
1MΩ
10MΩ
VR4 || VR1
VR3 || VR1
VR2 || VR1
VR1
ver. 1.7
16
12/01/12
CYRUSTEK [ Cyrustek corporation ]
