Electronic Components Datasheet Search
  English  ▼

X  

Preview PDF HTML

AS8228 Datasheet(PDF) 47 Page - ams AG

Part # AS8228
Description  Highly Integrated Single Phase 2 Current Energy Metering Integrated Circuits
PDF  123 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS8228 Datasheet(HTML) 47 Page - ams AG

Back Button AS8228 Datasheet HTML 43Page - ams AG AS8228 Datasheet HTML 44Page - ams AG AS8228 Datasheet HTML 45Page - ams AG AS8228 Datasheet HTML 46Page - ams AG AS8228 Datasheet HTML 47Page - ams AG AS8228 Datasheet HTML 48Page - ams AG AS8228 Datasheet HTML 49Page - ams AG AS8228 Datasheet HTML 50Page - ams AG AS8228 Datasheet HTML 51Page - ams AG Next Button
Zoom Inzoom in Zoom Outzoom out
 47 / 123 page
background image
Data Sheet AS8218 / AS8228
Revision 3.0, 31-May-06
Page 47 of 123
FREQ_TRIM[4:0] Correction [ppm]
Seconds per Day 1
Seconds per Day 2
1
1
0
1
0
-34.8
-3
-3
1
1
0
0
1
-40.6
-3
-4
1
1
0
0
0
-46.4
-4
-4
1
0
1
1
1
-52.2
-4
-5
1
0
1
1
0
-58.0
-5
-5
1
0
1
0
1
-63.8
-5
-6
1
0
1
0
0
-69.6
-6
-6
1
0
0
1
1
-75.4
-6
-7
1
0
0
1
0
-81.2
-7
-7
1
0
0
0
1
-87.0
-7
-8
1
0
0
0
0
-92.8
-8
-8
The table specifies 2 successive days with (possibly) a different number of seconds that have to be added or
subtracted per day. ‘day1/day2’ are repeated continuously.
The RTC is always adjusted at the same time: 00:00 a.m. and 30 seconds. (The 30 seconds is required to
avoid conflicts with alarm settings, which are defined to occur at 0 seconds.)
Subtraction means that the specified number of 1Hz pulses is ignored. This has the effect that the clock stands
still for the specified number of seconds.
Example: A crystal has a frequency that is 30ppm higher than specified. Therefore the RTC will run faster.
Thus, the RTC has to correct in the negative direction, by subtracting seconds. Value ‘11011’ (-29.0) will be
chosen which means that on day1, 2 seconds are subtracted, then on the next day 3 seconds are subtracted,
then 2 seconds again and so on.
Battery Backup Operation
The AS8218 / AS8228 ICs contain a real-time clock (RTC) circuit, which must continue to operate even when
the mains supply voltage (Vmains) is interrupted. A battery backup facility is provided for this purpose at pin
VDD_BAT.
The low power oscillator (LP_OSC), low power divider (LP_DIV) and the real time clock (RTC) are all supplied
from the VDD_BAT pin.
The recommended battery backup circuit is shown below. The battery is connected to the VDD_BAT pin via one
or two diodes. The external VDD is also connected to the VDD_BAT pin via a diode, with the battery backup
only providing supply to the AS8218 / AS8228 ICs when the external VDD is interrupted.
external
VDD
VDD_BAT
+



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100  ...More


Datasheet Download

Go To PDF Page


Link URL



Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link to Datasheet    |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com