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AS8267 数据表(PDF) 49 Page - ams AG

部件名 AS8267
功能描述  Single-Phase 2-Current Energy Measurement Integrated Circuits with Microcontroller, RTC, Programmable Multi-Purpose I/Os
PDF  136 Pages
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制造商  AMSCO [ams AG]
网页  http://www.ams.com
标志 AMSCO - ams AG

AS8267 数据表(HTML) 49 Page - ams AG

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Data Sheet AS8267 / AS8268
Revision 1.0, 19-Jun-07
Page 49 of 136
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 AS8267 / AS8268 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 AS8267 / AS8268 ICs when the external VDD is interrupted.
external
VDD
VDD_BAT
+



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