71M6521BE Datasheet, PDF (78/97 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521BE
Energy Meter IC
DATA SHEET
JANUARY 2008
The CE is initialized by the MPU using CECONFIG (CESTATE). This register contains in packed form the control bits for
SAG_CNT, FREQSEL, NEUTRAL_TAMPER, IB_SHUNT, IA_SHUNT, PULSE_SLOW, and PULSE_FAST.
CE
Address
0x1040
Name
CECONFIG
Default
0x5000
Description
See description of CECONFIG below
The significance of the bits in CECONFIG is shown in the table below:
IA_SHUNT and/or IB_SHUNT can configure their respective current inputs to accept shunt resistor sensors. In this case the CE
provides an additional gain of 8 to the selected current input. WRATE may need to be adjusted based on the values of
IA_SHUNT and IB_SHUNT. Whenever IA_SHUNT or IB_SHUNT are set to 1, In_8 (in the equation for Kh) is assigned a value of
8.
The CE pulse generator is controlled only by the CE (internal) variables.
Note: The 6521BE Demo Code creep function halts both internal and external pulse generation.
CECONFIG
[bit]
[15:8]
[7]
[6]
Name
SAG_CNT
--
FREQSEL
Default
Description
80
(0x50)
0
0
Number of consecutive voltage samples below SAG_THR before a sag
alarm is declared. The maximum value is 255. SAG_THR is at address
0x14.
Reserved
Selected phase for frequency monitor (0 = A, 1 = B).
[5]
NEUTRAL TAMPER
0
Alert CE that neutral line tampering has been detected.
[4]
MAGNETIC TAMPER
0
Alert CE that magnetic tampering has been detected.
[3]
IB_SHUNT
0
When 1, the current gain of channel B is increased by 8. The gain factor
controlled by In_SHUNT is referred to as In_8 throughout this document.
[2]
IA_SHUNT
0
When 1, the current gain of channel A is increased by 8.
When PULSE_SLOW = 1, the pulse generator input is reduced by a factor of
64. When PULSE_FAST = 1, the pulse generator input is increased 16x.
[1]
PULSE_FAST
0
These two parameters control the pulse gain factor X (see table below).
Allowed values are either 1 or 0. Default is 0 (X = 6).
X
PULSE_SLOW
PULSE_FAST
1.5 * 2² = 6
0
0
1.5 * 2⁶ = 96
0
1
[0]
PULSE_SLOW
0
1.5 * 2^-4 = 0.09375
1
0
1.5
1
1
Page: 78 of 97
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