ES51970(6000counts)
DMM Analog front end with Inrush
2.9 ADP mode
MPU send write command to select the ADP mode measurement function. The Hz mode
measurement is available to be enabled with the ADP AC function (set AC bit to 1)
simultaneously. The measured signal is applied to ADP terminal (pin39). The signal full
scale is 600mV for DC mode and 600mVrms for AC mode. The FS60 control bit is used for
ADP DC mode. When FS60=1, the full scale will be change from 600mV to 60mV. It
means the resolution will be improved to 0.01mV, but the ADC conversion rate will be
reduced to 0.9 /sec.
See the next table of function command:
F3
1
F2
0
F1
0
F0
1
AC
0
Measurement mode
ADP DC mode
Read data bytes
D0(0:18), D1(0:9)
1
0
0
1
1
ADP AC mode
D0(0:18), D1(0:9)
1
0
1
0
1
ADP + Hz mode
D0(0:18), D1(0:9), D3(0:18)
Note1: D0/D1/D3 all are binary format. ASIGN/BSIGN are the sign bit of D0/D1, respectively.
Frequency range control for ADP+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
If MPU set the control bit EXT_ADP=1, the voltage on EXTSRC pin could be switched to
ADP terminal internally. It is helpful for a voltage pulled application of ADP mode.
External source
pull high or low
EXT_ADP
ADC IN+
ADP_IN
ADC IN-
SGND
ver. 2.8
21
12/01/12
CYRUSTEK [ Cyrustek corporation ]
