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ES51970 Datasheet(PDF) 17 Page - Cyrustek corporation |
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ES51970 Datasheet(HTML) 17 Page - Cyrustek corporation |
17 / 26 page ver. 2.8 12/01/12 17 ES51970(6000counts) DMM Analog front end with Inrush 2.5 Capacitance Measurement MPU send write command to select the capacitance measurement function. F3 F2 F1 F0 Measurement mode Read data bytes 1 0 0 0 Capacitance mode D0(0:18) Note1: D0 is binary format. ASIGN bit is ignored. Range control for capacitance mode Q2 Q1 Q0 Full Scale Range Relative Resistor Measurement Period 0 0 0 6.000nF - 0.5 sec 0 0 1 60.00nF OVX pin VR 0.5 sec 0 1 0 600.0nF - 1.25 sec 0 1 1 6.000uF R9K / R1K 0.4 sec max. 1 0 0 60.00uF R9K / R1K 0.5 sec max. 1 0 1 600.0uF R9K / R1K 1.0 sec max. 1 1 0 6.000mF R9K / R1K 1.35 sec max. 1 1 1 60.00mF R9K / R1K 6.75 sec max. ALARM bit at capacitance mode is used for increasing the ranging speed. If MPU check the ALARM=1 at lower range, it could set the next range to 6.000uF directly and the ADC output should be ignored. STA0 status bit is used for detection of DUT capacitor voltage. If STA0=1, the internal capacitor discharging mode is active and the capacitance measurement is inhibited. It is recommended to discharge the DUT capacitor externally. 2.6 Continuity Check measurement MPU send write command to select the continuity measurement function. F3 F2 F1 F0 Measurement mode Read data bytes 0 1 0 1 Continuity mode D0(0:18), D1(0:9) Note1: D0/D1 both are binary format. ASIGN/BSIGN bits both are ignored. Continuity mode shares the same configuration with 600.0Ω resistance 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 -7mV). 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. |
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