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CS5460A
5.9 Power Offset Register
Address:
MSB
14
LSB
-(2 )
2
2
2
2
2
0
2
-1
2
-2
-3
-4
-5
-6
-7
.....
2 -17
2
-18
2
-19
2
-20
2
-21
2
-22
2 -23
Default** = 0.000
This offset value is added to each power value that is computed for each voltage/current sample pair before
being accumulated in the Energy Register. The numeric format of this register is two’s complement notation.
This register can be used to offset contributions to the energy result that are caused by undesirable sources of
energy that are inherent in the system.
5.10 Current Channel AC Offset Register and Voltage Channel AC Offset Register
Address:
MSB
16 (Current Channel AC Offset Register)
17 (Voltage Channel AC Offset Register)
LSB
2 -13
2 -14
2 -15
2 -16
2 -17
2 -18
2 -19
2 -20
.....
2 -30
2 -31
2 -32
2 -33
2 -34
2 -35
2 -36
Default** = 0.000
The AC offset registers are initialized to zero on reset, allowing the device to function and perform measure-
ments. First, the ground-level input should be applied to the inputs. Then the AC Offset Calibration Command
is should be sent to the CS5460A. After ~(6N + 30) A/D conversion cycles (where N is the value of the Cy-
cle-Count Register), the gain register(s) is loaded with the square of the system AC offset value. DRDY will be
asserted at the end of the calibration. The register may be read and stored so the register may be restored with
the desired system offset compensation. Note that this register value represents the square of the AC cur-
rent/voltage offset.
5.11 Status Register and Mask Register
Address:
15 (Status Register)
26 (Mask Register)
23
DRDY
15
PWOR
7
ID1
22
EOUT
14
IROR
6
ID0
21
EDIR
13
VROR
5
WDT
20
CRDY
12
EOR
4
VOD
19
MATH
11
EOOR
3
IOD
18
Res
10
Res
2
LSD
17
IOR
9
ID3
1
0
16
VOR
8
ID2
0
IC
Default** = Binary: 00000000000000xxxx000001 (Status Register)
{x = state depends on device revision}
Binary: 000000000000000000000000 (Mask Register)
The Status Register indicates the condition of the chip. In normal operation writing a '1' to a bit will cause the bit
to go to the '0' state. Writing a '0' to a bit will maintain the status bit in its current state. With this feature the user
can write logic ‘1’ values back to the Status Register to selectively clear only those bits that have been re-
solved/registered by the system MCU, without concern of clearing any newly set bits. Even if a status bit is
masked to prevent the interrupt, the corresponding status bit will still be set in the Status Register so the user
can poll the status.
The Mask Register is used to control the activation of the INT pin. Placing a logic '1' in the Mask Register will
48
DS487F5
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