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AS8267 Datasheet(PDF) 65 Page - ams AG |
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AS8267 Datasheet(HTML) 65 Page - ams AG |
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65 / 136 page  Data Sheet AS8267 / AS8268 Revision 1.0, 19-Jun-07 Page 65 of 136 Pulse Counter A synchronous pulse counter is used. It is started after the COUNT bit has been set. The first led pulse is used for synchronisation. The second led pulse starts counting the reference pulses from the specified I/O input. Timing: COUNT led Gate refp counted refp CINT Notes: 1) The COUNT signal is synchronized with ‘led’. 2) COUNT is reset and CINT is set using clk and checking for falling edge on Gate. 3) The PCNT register is only updated when counting is finished. Example: Select IO3 as the pulse reference input. Meter is 220Vmains; Imax = 20A Meter constant: 1,600imp/kWh Reference meter constant: 16 million imp/kWh Register settings: MPIO SET_EN0 (9505h): IO3 bit = 0 (output disabled) SEL_IN_REFP (950Ch): 02h DSP mconst (9330h): 07h (Ideal) Pulse_lev (932Ch – 932Ah) = A 20 A 40 V 220 V 230 950 , 570 × × = 1,193,804 ⇒ 12374Ch ⇒ 932Ah: 4Ch 932Bh: 37h 932Ch: 12h |
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