71M6515H-IGT/F Maxim Integrated Products, 71M6515H-IGT/F Datasheet - Page 18

• Manufacturer Part Number: 71M6515H-IGT/F
• Description: IC ENERGY METER AFE 3PH 64-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of 71M6515H-IGT/F

• Mounting Style: SMD/SMT
• Package / Case: LQFP-64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Internal data is pulsed out during the accumulation interval immediately following its accumulation interval. Post-processed
values are pulsed out one accumulation interval after that.
The pulse generator output rate depends on its input value, WRATE, PULSE_SLOW, and PULSE_FAST. Additionally, its
maximum pulse width (negative going pulse) is controlled by PULSEWIDTH. High frequency pulses will have 50% duty cycle
until their rate slows enough that their pulse width is limited by PULSEWIDTH.
In internal and post-processed modes, the pulse rate, expressed as Kh (Wh per pulse) is given by the formula:
In external pulse mode, the pulse rate is given by the formula:
External pulse generation can be seen as providing the raw voltage and current readings equivalent to V
the pulse generator.
The maximum pulse rate is 7.56kHz for PULSEW and PULSER, and 150Hz for PULSE3 and PULSE4.
In external pulse mode, the pulse generators load their data at the beginning of each CE accumulation interval, preserving any
partially implemented pulses from the previous interval. The source of data is controlled by the entries in the PULSE_SRCS
register. PULSER_SRCS contains 8-bit entries for each pulse source, PULSEW, PULSER, PULSE3, and PULSE4. See the
register description for details.
The procedure for accurate external pulse generation controlled by the host is:
Figure 8 illustrates pulse generator timing.
Regardless of the source, the pulse generators should receive new data during each accumulation interval. If this does not
occur and if the corresponding bit in the STMASK register is set, an APULSE_ERR interrupt will be issued.
The PULSEW, PULSER, PULSE3 and PULSE4 pins are suitable for driving LEDs through a current limiting resistor. The LED
should be connected so it is on when the pulse pin is low.
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1)
2)
3)
where
VMAX is the meter voltage corresponding to an input voltage of 176mV (rms) at the VA, VB, and VC input pins ,
IMAX is the meter current corresponding to an input voltage of 176mV (rms) at the IA, IB, and IC input pins,
In_8 is the additional ADC gain (1 or 8), as controlled by the IA_X, IB_X and IC_X bits in the CONFIG register.
X is the pulse speed factor determined from Table 3.
Rate(Hz) = WRATE * X * input * 35.82*10
where input is the value in registers APULSER, APULSEW. APULSE3 or APULSE4,
X is the pulse speed factor determined from Table 3.
Respond to a READY interrupt by reading the accumulated values.
Process the accumulated values.
Write the processed value(s) to APULSER, APULSEW, APULSE3, or APULSE4. The host must write to APULSER,
APULSEW, APULSE3, and APULSE4 before the next READY interrupt for the pulse generation to be beginning in the
following accumulation interval.
Kh
A Maxim Integrated Products Brand
=
In
_
8
⋅
SUM
VMAX
_
CYCLES
IMAX
PULSE_SLOW
1 (default)
© 2005−2011 Teridian Semiconductor Corporation
⋅
WRATE
0
0
1
Table 3: Pulse Speed Factor X
-12
,
⋅
X
PULSE_FAST
. 1
1 (default)
5757
0
1
0
Wh
/
Pulse
1.5*2
1.5*2
1.5*2
1.5
2
6
-4
=6
=96
=0.09375
X
Energy Meter IC
DATA SHEET
71M6515H
in
*I
in
/ LSB directly to
JULY 2011
1.6