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MCP3906AT-E/SS Datasheet(PDF) 19 Page - Microchip Technology |
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MCP3906AT-E/SS Datasheet(HTML) 19 Page - Microchip Technology |
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19 / 32 page  © 2006-2011 Microchip Technology Inc. DS22011B-page 19 MCP3905A/05L/06A The high-frequency output HFOUT has lower integration times and, thus, higher frequencies. The output frequency value can be calculated with the following equation: EQUATION 4-2: HFOUT FREQUENCY OUTPUT EQUATION The constant HFC depends on the FOUT0 and FOUT1 digital settings with the Table 4-4. The detailed timings of the output pulses are described in the Timing Characteristics table (see Section 1.0 “Electrical Characteristics” and Figure 1-1). 4.7.1 MINIMAL OUTPUT FREQUENCY FOR NO-LOAD THRESHOLD The MCP3905A/05L/06A devices also include, on each output frequency, a no-load threshold circuit that will eliminate any creep effects in the meter. The outputs will not show any pulse if the output frequency falls below the no-load threshold. The minimum output frequency on FOUT0/1 and HFOUT is equal to 0.0015% of the maximum output frequency (respectively FC and HFC) for each of the F2, F1 and F0 selections (see Table 4-3 and Table 4-4); except when F2, F1, F0 = 011. In this last configuration, the no-load threshold feature is disabled. The selection of FC will determine the start-up current load. In order to respect the IEC standards requirements, the meter will have to be designed to allow start-up currents compatible with the standards by choosing the FC value matching these requirements. For additional applications information on no-load threshold, startup current and other meter design points, refer to AN994, "IEC Compliant Active Energy Meter Design Using The MCP3905/6”, (DS00994). HF OUT Hz () 8.06 V 0 × V 1 G × × HF C × V REF () 2 ---------------------------------------------------------------- = Where: V0 is the RMS differential voltage on channel 0 V1 is the RMS differential voltage on channel 1 G is the PGA gain on channel 0 (current channel) HFC is the frequency constant selected VREF is the voltage reference TABLE 4-3: MCP3905L OUTPUT FREQUENCY SETTINGS F2 F1 F0 HFC HFC (Hz) HFC (Hz), MCLK=3.58 MHz HFOUT (Hz), w/ full scale AC inputs FC (Hz) FC (Hz), MCLK=3.58 MHz 000 64XFC MCLK/215 109.25 23.71 MCLK/221 1.71 001 32XFC MCLK/215 109.25 23.71 MCLK/220 3.41 010 16XFC MCLK/215 109.25 23.71 MCLK/219 6.83 011 2048XFC MCLK/27 27968.75 6070.12 MCLK/218 13.66 100 8XFC MCLK/216 54.62 11.85 MCLK/219 6.83 101 64XFC MCLK/216 54.62 11.85 MCLK/222 0.85 110 32XFC MCLK/216 54.62 11.85 MCLK/221 1.71 111 16XFC MCLK/216 54.62 11.85 MCLK/220 3.41 TABLE 4-4: MCP3905A/06A OUTPUT FREQUENCY SETTINGS F2 F1 F0 HFC HFC (Hz) HFC (Hz), MCLK=3.58 MHz HFOUT (Hz), w/ full scale AC inputs FC (Hz) FC (Hz), MCLK=3.58 MHz 000 64XFC MCLK/215 109.25 23.71 MCLK/221 1.71 001 32XFC MCLK/215 109.25 23.71 MCLK/220 3.41 010 16XFC MCLK/215 109.25 23.71 MCLK/219 6.83 011 2048XFC MCLK/27 27968.75 6070.12 MCLK/218 13.66 100 128XFC MCLK/214 219.51 47.42 MCLK/221 1.71 101 64XFC MCLK/214 219.51 47.42 MCLK/220 3.41 110 32XFC MCLK/214 219.51 47.42 MCLK/219 6.83 111 16XFC MCLK/214 219.51 47.42 MCLK/218 13.66 |
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