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ES51999 Datasheet(PDF) 17 Page - Cyrustek corporation |
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ES51999 Datasheet(HTML) 17 Page - Cyrustek corporation |
17 / 21 page 07/07/06 17 ES51999 4 3/4 and 5 3/4 A/D AUTO Conversion time Range C[0] = 0 C[0] = 1 40Hz 0.8s ~ 2s 400Hz 0.16s ~ 0.4s 4000Hz 0.16s ~ 0.4s 40KHz 110ms 1.1s 400KHz 110ms 1.1s 4MHz 110ms 1.1s 40MHz 110ms 1.1s 400MHz 110ms 1.1s (10)Voltage/Current Measurement with Frequency Counter When F[0:2] = “001” or “011”, ES51999 measures frequency of input together with voltage/current. At this measurement mode, voltage (or current) input is VR1/400mV (or IVSH/IVSL), and frequency input is FREQ. Q[0:2] is the range of voltage/current measurement, and C[0:2] is the range of frequency measurement. Only 40K to 400MHz ranges are selectable here. Unlike frequency measurement (F[0:2] = “110”), duty cycle is not measured in this mode. The conversion time is fixed at 110ms. Voltage/current can count up to 54,000 (or 540,000 when 10MHz OSC is used). AC and PEAK can still be active. D0 is the output of voltage/current, and (10×D1) is the result of frequency. (11) SLEEP mode If SLEEP bit is set ‘H’ by uP, ES51999 enters sleep mode. In sleep mode, if SCLK keeps low, all the circuit is shut down, and the supply current is about 0.1uA. If SCLK is high in sleep mode, only the oscillator is active to prepare for the following re-power operation. (12) Digital Signals Rising and Falling times The digital signals include EOC, SCLK, and STATUS, and those rising and falling times are defined as follow: EOC and STATUS are output to microprocessor: V- (V-)+0.8V (V-)+2.1V V+ tro tfo |
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