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71M6511/71M6511H
Single-Phase Energy Meter IC
A Maxim Integrated Products Brand
DATA SHEET
NOVEMBER 2010
Pin Descriptions
Power/Ground Pins
Name
GNDA
GNDD
V3P3A
V3P3D
VBAT
V2P5
VLCD
Pin #
49, 58
1
50
9
46
47
62
Type
P
P
P
P
P
O
P
Description
Analog ground: This pin should be connected directly to the ground plane.
Digital ground: This pin should be connected directly to the ground plane.
Analog power supply: A 3.3V power supply should be connected to this pin.
Digital power supply: A 3.3V power supply should be connected to this pin.
Battery backup power supply. A battery or super-capacitor should be connected between
VBAT and GNDD. If no battery is used, connect VBAT to V3P3D.
Output of the internal 2.5V regulator. A 0.1μF capacitor to GNDA should be connected to this
pin.
LCD power supply. A DC source of 3.3V to 5.0V should be connected to this pin.
Analog Pins
Name
Pin #
Type
Circuit
Description
Line Current Sense Input: This pin is a voltage input to the internal A/D converter.
IA
54
I
6
Typically, it is connected to the output of a current transformer or shunt resistor. If
the pin is unused it must be connected to V3P3A or tied to the IB pin.
Line Voltage Sense Input: This pin is a voltage input to the internal A/D converter.
VA
51
I
6
Typically, it is connected to the output of a resistor divider. If the pin is unused it
must be tied to V3P3A.
Line Current Sense Input: This pin is a voltage input to the internal A/D converter.
IB
53
I
6
Typically, it is connected to the output of a current transformer or shunt resistor. If
the pin is unused it must be connected to V3P3A or tied to the IA pin.
Comparator Input: This pin is a voltage input to the internal comparator. The voltage
applied to the pin is compared to an internal reference voltage of 1.5V. If the input
V1
56
I
7
voltage is above the reference, the comparator output will be high (1). If the
comparator output is low, a voltage fault will occur. See the precautions in the
Applications Section for terminating this pin.
VREF
VBIAS
55
52
O
O
9
9
Voltage Reference for the ADC. A 0.1μF capacitor to GNDA should be connected to
this pin.
This pin outputs the reference voltage used by the power fault detection circuit. A
1,000pF capacitor to GND should be connected to this pin.
Crystal Inputs: A 32kHz style crystal should be connected across these pins.
XIN
XOUT
59
61
I
8
Typically, a 20pF capacitor is also connected from each pin to GNDA. It is important
to minimize the capacitance between these pins. See the crystal manufacturer
datasheet for details.
VDRV
7
O
4
Voltage boost output.
Pin types: P = Power, O = Output, I = Input, I/O = Input/Output
The circuit number denotes the equivalent circuit, as specified under “I/O Equivalent Circuits”.
Page: 94 of 98
? 2005–2010 Teridian Semiconductor Corporation
V2.7
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