ES51970(6000counts)
DMM Analog front end with Inrush
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
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 ES51970. 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.
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 Measurement
MPU send write command to select the resistance measurement function.
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.
Range control for resistance mode
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
600.0Ω
6.000KΩ
60.00KΩ
600.0KΩ
6.000MΩ
60.00MΩ
VR5
1KΩ
10KΩ
100KΩ
1MΩ
10MΩ
VR4 || VR1
VR3 || VR1
VR2 || VR1
VR1
ver. 2.8
16
12/01/12
CYRUSTEK [ Cyrustek corporation ]
