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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+

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