90E32 Datasheet, PDF (53/71 Pages) Integrated Device Technology – Poly-Phase High-Performance Wide-Span Energy Metering IC

90E32
POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
CS0
Checksum 0
Address: 3BH
Type: Read/Write
Default Value: 421CH
Bit
Name
Description
This register should be written after the 31H-3AH registers are written. Suppose the high byte and the low byte of the 31H-3AH
registers are shown in the below table.
15 - 0
CS0[15:0]
Register Address
31H
32H
33H
34H
35H
36H
37H
38H
39H
3AH
High Byte
H₃₁
H₃₂
H₃₃
H₃₄
H₃₅
H₃₆
H₃₇
H₃₈
H₃₉
H_3A
Low Byte
L₃₁
L₃₂
L₃₃
L₃₄
L₃₅
L₃₆
L₃₇
L₃₈
L₃₉
L_3A
The calculation of the CS0 register is as follows:
The low byte of 3BH register is: L_3B=MOD(H₃₁+H₃₂+...+H_3A+L₃₁+L₃₂+...+L_3A, 2^8)
The high byte of 3BH register is: H_3B=H₃₁ XOR H₃₂ XOR... XOR H_3A XOR L₃₁ XOR L₃₂ XOR... XOR L_3A
The 90E32 calculates CS0 regularly. If the value of the CS0 register and the calculation by the 90E32 is different when Config-
Start=8765H, the CS0Err bit (b14, SysStatus0) is set and the WarnOut and IRQ pins are asserted.
Note: The readout value of the CS0 register is the calculation by the 90E32, which is different from what is written.
There are multiple Start register and Checksum (CS0/CS1/CS2/CS3) registers for different crucial register blocks. Those registers are handled in
the similar way.
6.4.3 ENERGY CALIBRATION REGISTERS
Table-6 Calibration Registers
Register
Address
Register Name
40H
CalStart
41H
POffsetA
42H
QOffsetA
43H
POffsetB
44H
QOffsetB
45H
POffsetC
46H
QOffsetC
47H
GainA
48H
PhiA
49H
GainB
Read/Write
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Functional Description
Calibration Registers
Calibration Start Command
Phase A Active Power Offset
Phase A Reactive Power Offset
Phase B Active Power Offset
Phase B Reactive Power Offset
Phase C Active Power Offset
Phase C Reactive Power Offset
Phase A Active/Reactive Energy calibration
gain
Phase A calibration phase angle
Phase B Active/Reactive Energy calibration
gain
Power-on Value
6886H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
Register
53
December 9, 2011