SA9110AFA Ver la hoja de datos (PDF) - South African Micro Electronic Systems
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SA9110AFA
South African Micro Electronic Systems
SA9110AFA Datasheet PDF : 18 Pages
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SA9110A
Offset Adjustment
The precision of this device does not require any offset adjustment for Class 1
metering. This facility has been provided to compensate for poor PCB layout or
circumstances requiring precision well beyond a Class 1 rating.
The offset of the device may be adjusted by programming a different offset into the
device during calibration. To calaculate the offset the following procedure should
be followed:
Measure the linearity error at the current where offset correction is needed.
KO =
I
M
*
E
RR
I
R
*
6
*
10-6
Where
I = Measured current on the current sensor
M
IR = Rated current on the current sensor
E = Error ratio between the device and the Wh standard
RR
K = Offset constant (-127 ... 127)
O
Note that KO must be programmed as a integer value.
Meter/Manufacturers Identification Data
A total of eleven 4 bit words are available to store relevant data such as the meter
and manufacturer identification codes. For the optical interface protocol, the 4-bit
words are converted to 8-bit words (ASCII-format).
Writing to RAM
The memory is configured as ten 32 bit words. The programming data must be
written to the device as a bitstream containing a total of 320 bits. ROM-locations
will not be overwritten.
Word Bit Function
number number
1 31..28 Sign of Register 1
1
27..0 Register 1
2 31..28 Sign of Register 2
2
27..0 Register 2
3 31..28 Sign of Register 3
3
27..0 Register 3
4 31..28 Sign of Register 4
4
27..0 Register 4
5 31..28 Sign of Register
'Total'
Description
A '1' indicates a negative register value
Contents of register 1 in binary coded decimal
A '1' indicates a negative register value
Contents of register 2 in binary coded decimal
A '1' indicates a negative register value
Contents of register 3 in binary coded decimal
A '1' indicates a negative register value
Contents of register 4 in binary coded decimal
A '1' indicates a negative register value
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