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90E21 Datasheet(PDF) 36 Page - Integrated Device Technology

Part # 90E21
Description  Single-Phase High-Performance Wide-Span Energy Metering IC
PDF  57 Pages
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

90E21 Datasheet(HTML) 36 Page - Integrated Device Technology

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90E21/22/23/24
SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
Register
36
January 10, 2012
CS2
Checksum 2
Address: 3BH
Type: Read/Write
Default Value: 0000H
Bit
Name
Description
15 - 0
CS2[15:0]
The CS2 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 below table.
The calculatiion of the CS2 register is as follows:
The low byte of 3BH register is: L3B=MOD(H31+H32+...+H3A+L31+L32+...+L3A, 2^8)
The high byte of 3BH register is: H3B=H31 XOR H32 XOR ... XOR H3A XOR L31 XOR L32 XOR ... XOR L3A
For 90E21/22/23, a part of registers are not used. These registers can be dealed as 0000H in CS calculation.
The 90E21/22/23/24 calculates CS2 regularly. If the value of the CS2 register and the calculation by the 90E21/22/23/24 is differ-
ent when AdjStart=8765H, the AdjErr[1:0] bits (SysStatus, 01H) are set.
Note:
The readout value of the CS2 register is the calculation by the 90E21/22/23/24, which is different from what is written.
15
14
13
12
11
10
9
8
CS2_15
CS2_14
CS2_13
CS2_12
CS2_11
CS2_10
CS2_9
CS2_8
765
432
1
0
CS2_7
CS2_6
CS2_5
CS2_4
CS2_3
CS2_2
CS2_1
CS2_0
Register Address
High Byte
Low Byte
31H
H31
L31
32H
H32
L32
33H
H33
L33
34H
H34
L34
35H
H35
L35
36H
H36
L36
37H
H37
L37
38H
H38
L38
39H
H39
L39
3AH
H3A
L3A



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