71M6511/71M6511H
Single-Phase Energy Meter IC
DATA SHEET
AUGUST 2007
Pin Descriptions
Power/Ground Pins
Name
Pin #
Type Description
GNDA
GNDD
V3P3A
V3P3D
49, 58
P
P
P
P
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.
1
50
9
Battery backup power supply. A battery or super-capacitor should be connected between VBAT
VBAT
46
P
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.
V2P5
VLCD
47
62
O
P
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
51
53
I
6
6
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.
Typically, it is connected to the output of a resistor divider. If the pin is unused it
must be tied to V3P3A.
VA
IB
I
I
Line Current Sense Input: This pin is a voltage input to the internal A/D converter.
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
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.
V1
56
I
7
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.
VREF
55
52
O
O
9
9
VBIAS
Crystal Inputs: A 32kHz style crystal should be connected across these pins.
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.
XIN
59
61
I
8
4
XOUT
VDRV
7
O
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: 92 of 95
© 2005-2007 TERIDIAN Semiconductor Corporation
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