90E24
Single-Phase High-Performance Wide-Span Energy Metering IC
The 90E24 is a high-performance energy metering device for single-phase two-wire, single-phase three-wire or anti-tampering active and reactive energy meters. With the measurement function, the 90E24 can also be used in power instruments which need to measure voltage, current, etc.
Features
- Fully compliant with IEC standard IEC62052-11, IEC62053-21 and IEC62053-23
- Applicable to class 1 or class 2 single-phase watt-hour meter or class 2 single-phase var-hour meter
- Accuracy of 0.1% for active energy and 0.2% for reactive energy over a dynamic range of 5000:1
- Temperature coefficient is 15ppm/°C (typical) for on-chip reference voltage
- Electrical parameters measurement: less than ± 0.5% fiducial error for Vrms, Irms, mean active/ reactive/apparent power, frequency, power factor and phase angle
- Dedicated ADC and different gains for L line and N line current sampling circuits
- Current sampled over shunt resistor or current transformer (CT)
- Voltage sampled over resistor divider network or potential transformer (PT)
- Programmable L line and N line metering modes
- Anti-tampering mode (larger power)
- L line mode (fixed L line)
- L+N mode (applicable for single-phase three-wire system)
- Flexible mode (configure through register)
- Voltage channel (when gain is ‘1’): 120uVrms~600mVrms
- L line current channel (when gain is ‘24’): 5uVrms~25mVrms
- N line current channel (when gain is ‘1’): 120uVrms~600mVrms
