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AS8267 Datasheet(PDF) 48 Page - ams AG

Part # AS8267
Description  Single-Phase 2-Current Energy Measurement Integrated Circuits with Microcontroller, RTC, Programmable Multi-Purpose I/Os
PDF  136 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS8267 Datasheet(HTML) 48 Page - ams AG

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Data Sheet AS8267 / AS8268
Revision 1.0, 19-Jun-07
Page 48 of 136
The Programmable Divider follows a fixed 'Divide by 5' divider, thus the default value to the Programmable
Divider is:
3.579545 / 5 = 715909 (default value to Programmable Divider)
Therefore: A change of 1Hz in this default value is equal to:
1 / 715909 = 1.397 ppm
Measure the deviation in the clk_1Hz frequency output provided by the AS8267 / AS8268 ICs
Assuming an error of +690 ppm is measured (faster than real-time)
Thus +690 / 1.397 = 493.915
≅ 494
Therefore 494 must be added to the default value:
715908 + 494 = 716402 (dec) = 0A EE 72 (hex)
Divider Register Byte 2 = 0A
Divider Register Byte 1 = EE
Divider Register Byte 0 = 72
The RTC is then calibrated to within +/- 1.4 ppm
Frequency Trimming (9133h)
A further option for clk_1Hz frequency trimming is available. In this case only the 5 lower bits of register
‘Frequency Trim’ (9133h) are used as defined in the following table.
FREQ_TRIM[4:0] Correction [ppm]
Seconds per Day 1
Seconds per Day 2
0
1
1
1
1
87.0
7
8
0
1
1
1
0
81.2
7
7
0
1
1
0
1
75.4
6
7
0
1
1
0
0
69.6
6
6
0
1
0
1
1
63.8
5
6
0
1
0
1
0
58.0
5
5
0
1
0
0
1
52.2
4
5
0
1
0
0
0
46.4
4
4
0
0
1
1
1
40.6
3
4
0
0
1
1
0
34.8
3
3
0
0
1
0
1
29.0
2
3
0
0
1
0
0
23.2
2
2
0
0
0
1
1
17.4
1
2
0
0
0
1
0
11.6
1
1
0
0
0
0
1
5.8
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
-5.8
0
-1
1
1
1
1
0
-11.6
-1
-1
1
1
1
0
1
-17.4
-1
-2
1
1
1
0
0
-23.2
-2
-2
1
1
0
1
1
-29.0
-2
-3



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