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HCPL-0870 数据表(PDF) 2 Page - Agilent(Hewlett-Packard) |
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HCPL-0870 数据表(HTML) 2 Page - Agilent(Hewlett-Packard) |
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2 / 28 page  1-261 RSHUNT 0.02 INPUT CURRENT VDD1 ISOLATED + 5 V VIN+ VIN- GND1 VDD2 MCLK MDAT GND2 C1 0.1 µF + CDAT SCLK CCLK VDD CLAT CHAN MCLK1 SDAT MDAT1 CS MCLK2 THR1 MDAT2 OVR1 GND RESET NON-ISOLATED + 5 V C3 10 µF + HCPL-7860 3-WIRE SERIAL INTERFACE C2 0.1 µF HCPL-x870 Digital Current Sensing Circuit As shown in Figure 1, using the Isolated 2-chip A/D converter to sense current can be as simple as connecting a current-sensing resistor, or shunt, to the input and reading output data through the 3-wire serial output interface. By choosing the appropriate shunt resistance, any range of current can be monitored, from less than 1 A to more than 100 A. Even better performance can be achieved by fully utilizing the more advanced features of the Isolated A/D converter, such as the pre-trigger circuit which can reduce conversion time to less Figure 1: Typical Application Circuit. Product Overview Description The HCPL-7860 Isolated Modu- lator and the HCPL-x870 Digital Interface IC together form an isolated programmable two-chip analog-to-digital converter. The isolated modulator allows direct measurement of motor phase currents in power inverters while the digital interface IC can be programmed to optimize the conversion speed and resolution trade-off. In operation, the HCPL-7860 Isolated Modulator (optocoupler with 3750 VRMS dielectric with- stand voltage rating) converts a low-bandwidth analog input into a high-speed one-bit data stream by means of a sigma-delta (∑ ∆) oversampling modulator. This modulation provides for high noise margins and excellent immunity against isolation-mode transients. The modulator data and on-chip sampling clock are encoded and transmitted across the isolation boundary where they are recovered and decoded into separate high-speed clock and data channels. The Digital Interface IC converts the single-bit data stream from the Isolated Modulator into fifteen-bit output words and provides a serial output interface that is compatible with SPI®, QSPI®, and Microwire® proto- cols, allowing direct connection to a microcontroller. The Digital Interface IC is available in two package styles: the HCPL-7870 is in a 16-pin DIP package and the HCPL-0870 is in a 300-mil wide SO-16 surface-mount package. Features of the Digital Interface IC include five different conver- sion modes, three different pre- trigger modes, offset calibration, fast over-range detection, and adjustable threshold detection. Programmable features are con- figured via the Serial Configura- tion port. A second multiplexed input is available to allow measurements with a second than 1 µs, the fast over-range detector for quickly detecting short circuits, different conversion modes giving various resolution/ speed trade-offs, offset calibra- tion mode to eliminate initial offset from measurements, and an adjustable threshold detector for detecting non-short circuit overload conditions. |
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