Ver 1.5

17/03/29

16

ES166

LCR/DMM analog front

2.5 Diode Measurement

MPU send write command to select the diode measurement function.

F3

F2

F1

F0

Measurement mode

Read data bytes

0

1

0

0

Diode check mode

D0(12-00)

Note1: D0 is binary format. SIGN is the sign bit of D0.

Diode measurement mode shares the same configuration with 6.000V voltage

measurement circuit and support the low-resistance detection. If the STBEEP output

(pin11) is low, it means the low-resistance status is detected (It means the OVX terminal

voltage less than 7mV). So MCU could monitor the STBEEP output and ADC (D0)

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. In this case,

the ALARM bit is active also.

2.6 Frequency/duty cycle mode measurement

The default typical input impedance of frequency with duty cycle mode is 100k

Ω. The

MCU send write command to select the frequency/duty cycle measurement function.

F3

F2

F1

F0

Measurement mode

Read data bytes

0

1

0

1

Hz + Duty mode

D0(12-00), D1(19-00), D2(19-00)

Note1: D0/D2/D3 all are binary format. ASIGN bit is ignored.

Range control for frequency mode

FQ2

FQ1

FQ0

Full Scale

0

0

0

N/A

0

0

1

600.0Hz

0

1

0

6.000KHz

0

1

1

60.00KHz

1

0

0

600.0KHz

1

0

1

6.000MHz

1

1

0

20.00MHz