71M6531D Datasheet, PDF (92/115 Pages) Teridian Semiconductor Corporation – Energy Meter IC

Data Sheet 71M6531D/F-71M6532D/F
FDS 6531/6532 005
CE Ad-
dress
0x21
0x41
0x42
0x43
0x44
0x38
Table 58: CE Pulse Generation Parameters
Name Default
Description
WRATE
827 Kh = VMAX*IMAX*47.1132 / (In_8*WRATE*N_ACC*X) Wh/pulse. The
default value results in a Kh of 1.0 Wh/pulse when 2520 samples
are taken in each accumulation interval (and VMAX=600,
IMAX = 442 [for 400µΩ shunt], In_8 = 1, X = 6).
Maximum value = 2¹⁵ -1.
APULSEW
0
Watt pulse generator input (see DIO_PW bit). The output pulse
rate is: APULSEW * F_S * 2^-32 * WRATE * X * 2^-14. This input is buf-
fered and can be loaded during a computation interval. The
change will take effect at the beginning of the next interval.
APULSER
0
VAR pulse generator input (see DIO_PV bit). The output pulse rate
is: APULSER * F_S*2^-32 * WRATE * X * 2^-14. This input is buffered and
can be loaded during a computation interval. The change will take
effect at the beginning of the next interval.
APULSE2
0
Third pulse generator input (see DIO_PV bit). The output pulse
rate is: APULSE2 * F_S*2^-32 * WRATE * X * 2^-14. This input is buffered
and can be loaded during a computation interval. The change will
take effect at the beginning of the next interval.
APULSE3
0
Fourth pulse generator input (see DIO_PV bit). The output pulse
rate is: APULSE3 * F_S*2^-32 * WRATE * X * 2^-14. This input is buffered
and can be loaded during a computation interval. The change will
take effect at the beginning of the next interval.
PULSE
WIDTH
12 Register for pulse width control of XPULSE and YPULSE. The max-
imum pulse width is (2*PULSEWIDTH+1)*(1/FS). The default value
will generate pulses of 10 ms width at FS = 2520.62 Hz.
4.3.9 CE Calibration Parameters
Table 59 lists the parameters that are typically entered to effect calibration of meter accuracy.
Table 59: CE Calibration Parameters
CE Ad-
dress
0x10
0x11
0x12
0x13
0x18
0x19
Name
CAL_IA
CAL_VA
CAL_IB
CAL_VB
PHADJ_A
PHADJ_B
Default
Description
16384
16384
16384
16384
0
0
These constants control the gain of their respective channels. The
nominal value for each parameter is 2¹⁴ = 16384. The gain of
each channel is directly proportional to its gain constant. Thus, if
the gain of the IA channel is 1% slow, CAL_IA should be scaled by
1/(1 – 0.01) and the resulting value is 16549.
These two constants control the CT phase compensation. No com-
pensation occurs when PHADJ_X = 0. As PHADJ_X is increased,
more compensation (lag) is introduced. Range: ± 2¹⁵ – 1. If it is
desired to delay the current by the angle Φ, the equations are:
PHADJ _ X = 2^{20 0.02229 ⋅TANΦ at 60Hz}
0.1487 − 0.0131⋅TANΦ
0x1F
0x39
TEMP_NOM
DEGSCALE
0
9174
PHADJ _ X = 2²⁰
0.0155 ⋅ TANΦ
at 50Hz
0.1241− 0.009695⋅TANΦ
This register contains the anchor or reference point for the tem-
perature measurement. At calibration temperature, the value read
at TEMP_RAW_X should be written to TEMP_NOM. The CE will
calculate the chip temperature TEMP_X relative to the reference
temperature.
The scale factor for the temperature calculation. It is not necessary
to use values other than the default value.
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