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ES51999 Datasheet(PDF) 7 Page - Cyrustek corporation

Part No. ES51999
Description  4 3/4 and 5 3/4 A/D AUTO
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Maker  CYRUSTEK [Cyrustek corporation]
Homepage  http://www.cyrustek.com.tw
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ES51999 Datasheet(HTML) 7 Page - Cyrustek corporation

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07/07/06
7
ES51999
4 3/4 and 5 3/4 A/D AUTO
2Frequency measurement could only be counted up to 40,000 regardless the oscillator
frequency.
3 In 40Hz range, ES51999 can count from 0.5Hz to 40Hz; in 400Hz range, it can count
from 2.5Hz to 400Hz; in 4000Hz, it can count from 25Hz to 4000Hz.
4 In Current measurement, two input pins (IVSH and IVSL) are provided and can be
selected by Q2.
C0, C1, C2 In voltage (F[0:2] = “000”) and current (“010”) measurement, C0 & C1
are used for conversion rate selection:
C0
C1
Conversion/sec
Conversion period
0
1
20
50ms
0
0
10
100ms
10
5
200ms
11
2
500ms
10, 5, and 2 conversion/sec are 50Hz rejection, while 2 conversion/sec is
60Hz rejection.
In resistance measurement, the conversion period is:
C0
C1
Conversion period
0
1
70ms
0
0
140ms
1
0
280ms
1
1
700ms
In frequency and duty cycle (F[0:2] = “110”) measurement, only C0 is used
for conversion period selection. When the range is from 40Hz to 4000Hz, the
conversion periods are not selectable (see the description in Frequency and
duty cycle measurement); and when the range is from 40KHz to 400MHz, the
conversion period is decided by C0:
C0 Conversion period
0
110ms
11.1s
In voltage/current with frequency mode (F[0:2] = “001” and “011”), the
conversion period is fixed at 110ms, and C0, C1 & C2 decide the range of the
frequency measurement:
C0
C1
C2
Range
0-
-
40KHz
100
400KHz
101
4MHz
110
40MHz
1
1
1
400MHz
AC ‘L’ for DC; ‘H’ for AC in Voltage/Current measurement. If not in voltage or
current measurement, this bit will be ignored.


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