71M6513-IGTR/F Maxim Integrated Products, 71M6513-IGTR/F Datasheet - Page 57

• Manufacturer Part Number: 71M6513-IGTR/F
• Description: IC ENERGY METER 3PH 100-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of 71M6513-IGTR/F

• Mounting Style: SMD/SMT
• Package / Case: LQFP-100
• Program Memory Size: 64 KB
• Program Memory Type: Flash
• Supply Current (max): 6.4 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XFER_BUSY interrupt. After these first two cycles, CHOP_EN returns to 11 (automatic toggle). The value of CHOP_EN, when
set after the XFER_BUSY interrupt, is in force for the entire following multiplexer cycle.
When using this sequence, the alternate multiplexer cycle is toggled between positive and reversed connection resulting in
accurate temperature measurement.
An example for proper application of the CHOP_EN bits can be found in the Demo Code shipped with the 6513 Demo Kits.
Firmware implementations should closely follow this example.
The CE is the source for pulses. It can generate pulses directly based on the voltage and current inputs and the configured
pulse generation parameters. This is called “internal pulse generation”, and applies when the CE RAM register EXT_PULSE
(address 0x37) equals 0. Alternatively, the CE can be configured to generate pulses based on registers that are controlled by
the MPU (“external pulse generation”), i.e. when the register EXT_PULSE equals 15. In the case of external pulse generation,
the MPU writes values to the CE registers APULSEW (0x26) and APULSER (0x27).
The pulse rate, usually inversely expressed as “Kh” (and measured in Wh per pulse), is determined by the CE RAM registers
WRATE, PULSE_SLOW, PULSE_FAST, In_8, as well as by the sensor scaling VMAX and IMAX per the equation:
where
01
alt. MUX
Positive Positive
cycle
CHOP_EN
In_8 is the gain factor (1 or 8) controlled by the CE variable In_SHUNT,
X is the pulse gain factor controlled by the CE variables PULSE_SLOW and PULSE_FAST
N
XFER_BUSY interrupt
A Maxim Integrated Products Brand
ACC
CE_BUSY interrupt
11
Accumulation Interval m
cycle 2
MUX
MUX_ALT
Chop Polarity
is the accumulation count (PRE_SAMPS * SUM_CYCLES)
(11)
cycle 3
versed
MUX
Figure 23: Sequence with Alternate Multiplexer Cycles and Controlled Chopping
re-
(11)
Internal/External Pulse Generation and Pulse Counting
(11)
Positive
cycle n
MUX
Kh
10
=
alt. MUX
versed
© 2005-2011 Teridian Semiconductor Corporation
cycle
re-
VMAX
In
_
Accumulation Interval m+1
8
11
versed
cycle 2
MUX
⋅
re-
WRATE
⋅
IMAX
(11)
Positive
cycle 3
MUX
⋅
⋅
N
66
(11)
3-Phase Energy Meter IC
ACC
.
1782
⋅
X
(11)
cycle n
versed
MUX
re-
[
Wh
71M6513/71M6513H
/
Positive Positive
01
alt. MUX
cycle
pulse
DATA SHEET
Accumulation Interval m+2
11
]
cycle 2
MUX
(11)
versed
cycle 3
MUX
re-
(11)
SEPTEMBER 2011
(11)
Page: 57 of 104
cycle n
Positive
MUX