SA2007P Datasheet, PDF (7/12 Pages) Sames – Programmable Single Phase Energy Metering IC with Tamper Detection

SA2007P
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PARAMETER DESCRIPTION
Refer to the EEPROM memory allocation map as well as the
Signal flow diagram figure 6, for a description of the registers
used in this section.
EEPROM Memory Allocation
The following table shows the EEPROM memory allocation as
well as the corresponding name. The uneven byte always
contains the XORed byte of the previous even byte. This is the
checksum byte used by the SA2007P to ensure data integrity.
Channel Balance (KC)
Kc defines the dividing factor, which is applied to the incoming
pulse rate. This value is typically 511. This factor is used for
calibration and gain balancing of the 2 current channels. The
value for Kc is usually between 400 and 640.
Kc is made up of 2 bytes, D12 and D14 or D16 or D18 which
forms a 10 bit value.
Rated Condition (KR)
Kr is used to program the rated condition of the meter. This
feature is required for a correct counter increment of meters
designed for different rated conditions using the same
integrated circuit. Rated conditions from less than 10A to
several 100A are possible.
The channel balance values should be used to compensate for
rounding errors in Kr. Kr is calculated as follows:
Kr =(1252 x 1000 x 3600)/(Rated volt x Rated current x 6400)-1
Kr is made up of 1 byte (D20)
Description
Channel 1 Balance LSB
Channel 1 Balance MSB
Channel 2 Balance LSB
Channel 2 Balance MSB
Rated Condition
Led Pulse-rate
Counter Pulse-width
Counter Resolution
Earth leak Compensation
Channel Select Mode
E²Address
12
13
14
15
16
17
18
19
20
21
22
23
24
24
25
26
26
27
Contents
Kc1
XOR of ADDR 12
Kc1
XOR of ADDR 14
Kc2
XOR of ADDR 16
Kc2
XOR of ADDR 18
Kr
XOR of ADDR 22
Cled
XOR of ADDR 22
Cpw
Cres
XOR of ADDR 24
Ne
Cs
XOR of ADDR 24
Bit [7:0]
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------vv
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vvvvvvvv
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------vv
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0v------
------vv
1xxxxxxx
------vv
----vv--
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KEY: (- = DON’T CARE); (V = VALUE/PARAMETER); (0,1 = LOGICAL VALUE); (X = BIT-XOR)
Name
D12
D14
D16
D18
D20
D22
D24
D26
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PRELIMINARY