ver. 2.8

12/01/12

21

ES51995(6000counts)

DMM Analog front end with PEAK

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

F2

F1

F0

AC

Measurement mode

Read data bytes

1

0

0

1

0

ADP DC mode

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.

Note2: See PEAK mode (section 2.10) also.

Frequency range control for ADP+Hz mode

FQ2 FQ1 FQ0 Full Scale Range

0

0

0

60.00Hz

0

0

1

600.0Hz

0

1

0

6.000kHz

0

1

1

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.

ADC IN+

ADC IN-

SGND

pull high or low

EXT_ADP

ADP_IN

External source

ADC IN+

ADC IN-

SGND

pull high or low

EXT_ADP

ADP_IN

External source