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71M6531D Datasheet(PDF) 91 Page - Teridian Semiconductor Corporation

Part No. 71M6531D
Description  Energy Meter IC
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Maker  TERIDIAN [Teridian Semiconductor Corporation]
Homepage  http://www.teridian.com
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71M6531D Datasheet(HTML) 91 Page - Teridian Semiconductor Corporation

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FDS 6531/6532 005
Data Sheet 71M6531D/F-71M6532D/F
v1.2
© 2005-2009 TERIDIAN Semiconductor Corporation
91
The RMS values can be computed by the MPU from the squared current and voltage samples as follows:
ACC
S
I
RMS
N
F
LSB
IxSQSUM
Ix
=
3600
Other Measurement Parameters
Table 57 describes the CE measurement parameters listed below:
MAINEDGE_X: Useful for implementing a real-time clock based on the input AC signal. MAINEDGE_X
is the number of half-cycles accounted for in the last accumulated interval for the AC signal.
TEMP_RAW: May be used by the MPU to monitor the chip temperature or to implement temperature
compensation.
GAIN_ADJ: A scaling factor for measurements based on the temperature. GAIN_ADJ can be con-
trolled by the MPU for temperature compensation.
VBAT_SUM_X: This result can be used to calculate the measured battery voltage (VBAT).
Table 57: Useful CE Measurement Parameters
CE Ad-
dress
Name
Default
Description
0x83
MAINEDGE_X
N/A
The number of zero crossings of the voltage selected with
FREQSELn in the previous accumulation interval. Zero
crossings are either direction and are debounced.
0x81
TEMP_RAW_X
N/A
The filtered, un-scaled reading from the temperature sensor.
0x9D
TEMP_X
N/A
This register contains the difference between the die temper-
ature and the reference/calibration temperature as estab-
lished in the TEMP_NOM register, measured in 0.1°C.
0x40
GAIN_ADJ
16384
Scales all voltage and current inputs. A value of 16384 pro-
vides unity gain. This register is used by the CE or by the
MPU to implement temperature compensation.
0x84
VBAT_SUM_X
N/A
The result of the battery voltage measurement.
4.3.8
Pulse Generation
Table 58 describes the CE pulse generation parameters WRATE, APULSEW, APULSER, APULSE2 and
APULSE3.
WRATE controls the number of pulses that are generated per measured Wh and VARh quantities. The
lower WRATE is the slower the pulse rate for measured energy quantity. The metering constant Kh is de-
rived from WRATE as the amount of energy measured for each pulse. That is, if Kh = 1 Wh/pulse, a pow-
er applied to the meter of 120 V and 30 A (3,600 W) results in one pulse per second. If the load is 240 V
at 150 A (36,000 W), ten pulses per second will be generated.
The maximum pulse rate is 7.5 kHz for APULSEW and APULSER and 1.2 kHz for APULSE2 and APULSE3.
The maximum time jitter is 67 µs and is independent of the number of pulses measured. Thus, if the pulse
generator is monitored for one second, the peak jitter is 67 ppm. After 10 seconds, the peak jitter is 6.7 ppm.
The average jitter is always zero. If it is attempted to drive either pulse generator faster than its maximum
rate, it will simply output at its maximum rate without exhibiting any rollover characteristics. The actual
pulse rate, using WSUM as an example, is:
Hz
X
F
WSUM
WRATE
RATE
S
46
2
=
,
where FS = sampling frequency (2520.6 Hz) and X = Pulse speed factor (as defined in the CECONFIG
register with the PULSE_FAST and PULSE_SLOW bits).
ACC
S
V
RMS
N
F
LSB
VxSQSUM
Vx
=
3600


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