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HCPL-0870 Datasheet(PDF) 24 Page - Agilent(Hewlett-Packard) |
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HCPL-0870 Datasheet(HTML) 24 Page - Agilent(Hewlett-Packard) |
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24 / 28 page  1-283 Table 8. Threshold Level Configuration. Configuration Data Bits Threshold Level Bit 5 Bit 4 Bit 3 Bit 2 ± 160 mV Low Low Low Low ± 170 mV Low Low Low High ± 180 mV High Low ± 190 mV High ± 200 mV High Low Low ± 210 mV High ± 220 mV High Low ± 230 mV High ± 240 mV High Low Low Low ± 250 mV High ± 260 mV High Low ± 270 mV High ± 280 mV High Low Low ± 290 mV High ± 300 mV High Low ± 310 mV High Note: Bold italic type indicates default values. Over-Range Detection The over-range detection circuit allows fast detection of when the magnitude of the input signal on channel 1 is near or beyond full scale, causing the OVR1 output to go high. This circuit can be very useful in current-sensing applica- tions for quickly detecting when a short-circuit occurs. The over- range detection circuit works by detecting when the modulator output data has not changed state for at least 25 clock cycles in a row, indicating that the input signal is near or beyond full- scale, positive or negative. Typical response time to over- range signals is less than 3 µs. The over-range circuit actually begins to indicate an over-range condition when the magnitude of the input signal exceeds approxi- mately 250 mV; it starts to generate periodic short pulses on OVR1 which get longer and more frequent as the input signal approaches full scale. The OVR1 output stays high continuously when the input is beyond full scale. The over-range detection circuit continuously monitors channel 1 independent of which channel is selected with the CHAN signal. This allows continuous monitor- ing of channel 1 for faults while converting an input signal on channel 2. Adjustable Threshold Detection The adjustable threshold detector causes the THR1 output to go high when the magnitude of the input signal on channel 1 exceeds a user-defined threshold level. The threshold level can be set to one of 16 different values between approximately 160 mV and 310 mV. The adjustable threshold detector uses a smaller version of the main conversion circuit in combination with a digital comparator to detect when the magnitude of the input signal on channel 1 is beyond the defined threshold level. As with the main conversion circuit, there is a trade-off between speed and resolution with the threshold detector; selecting faster detec- tion times exhibit more noise as the signal passes through the threshold, while slower detection times offer lower noise. Both the detection time and threshold level are programmable using bits 2 through 7 of configuration register 2, as shown in Tables 7 and 8 below. As with the over-range detector, the adjustable threshold detector continuously monitors channel 1 independent of which channel is selected with the CHAN signal. This allows continuous monitor- ing of channel 1 for faults while converting Channel 2. Table 7. Threshold Detection Configuration. Configuration Data Bits Time Bit 7 Bit 6 2 - 6 µs Low Low 3 - 10 µs Low High 5 - 20 µs High Low 10 - 35 µs High High Note: Bold italic type indicates default values. Threshold Detection |
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