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71M6543HT-IGT/F 数据表(PDF) 22 Page - Maxim Integrated Products |
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71M6543HT-IGT/F 数据表(HTML) 22 Page - Maxim Integrated Products |
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22 / 75 page  Maxim Integrated │ 22 71M6543FT/71M6543HT/ 71M6543GT/71M6543GHT Energy Meter ICs www.maximintegrated.com Figure 3. 71M6543FT/HT/GT/GHT Operating with Remote Sensor for Neutral Current used with CTs, or may be enabled to interface to a remote 71M6x03 isolated current sensor providing isolation for a shunt resistor sensor using a low cost pulse transformer. The remaining inputs (VADC8-VADC10) are single-ended and sense line voltage. These single-ended inputs are referenced to the VV3P3A pin. All analog signal input pins measure voltage. In the case of shunt current sensors, currents are sensed as a voltage drop in the shunt resistor sensor. Referring to Figure 2, shunt sensors can be connected directly to the 71M654xT (referred to as a ‘local’ shunt sensor) or connected via an isolated 71M6x03 (referred to as a ‘remote’ shunt sensor) (Figure 3). In the case of current transformers, the current is measured as a voltage across a burden resistor that is connected to the secondary winding of the CT. Meanwhile, line voltages are sensed through resistive voltage dividers. Pins IADC0-IADC1 can be programmed individually to be differential or single-ended. For most applications IADC0- IADC1 are configured as a differential input to work with a shunt or CT directly interfaced to the IADC0-IADC1 differential input with the appropriate external signal con- ditioning components. ∑ ADC CONVERTER VREF MUX VREF VREF VADC 22 22 FIR IADC0 VADC8 (VA) IADC1 CE RAM LOCAL SHUNT IN* VADC9 (VB) VADC10 (VC) REMOTE SHUNT IC 71M6543FT/HT/GT/GHT 71M6x03 * IN = OPTIONAL NEUTRAL CURRENT IADC6 IADC7 SP SN INP INN DIGITAL ISOLATION INTERFACE 22 REMOTE SHUNT IB 71M6x03 IADC4 IADC5 SP SN INP INN DIGITAL ISOLATION INTERFACE 22 REMOTE SHUNT IA 71M6x03 IADC2 IADC3 SP SN INP INN DIGITAL ISOLATION INTERFACE |
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