ver. 2.8

12/01/12

18

ES51995(6000counts)

DMM Analog front end with PEAK

2.7 Diode Measurement

MPU send write command to select the diode measurement function.

F3

F2

F1

F0

Measurement mode

Read data bytes

0

1

1

0

Diode mode

D0(0:18), D1(0:9)

Note1: D0/D1 both are binary format. ASIGN/BSIGN are the sign bit of D0/D1, respectively.

Diode measurement mode shares the same configuration with 6.000V voltage measurement

circuit and support the low-resistance detection. If the STBEEP output (pin64) is low, it

means the low-resistance status is detected (It means the OVX terminal voltage less than

9mV). It could be faster than the FADC result, so MPU could monitor the STBEEP output

and FADC (D1) 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.

The default source voltage at diode mode is the same as V+ potential. MPU could set the

control bit EXT=1 to change the source voltage to external source. The external voltage

source (positive or negative) input applied from EXTSRC (pin16). The available external

source range should be from V+ to V-.