71M6533 Datasheet, PDF (123/132 Pages) Teridian Semiconductor Corporation – Energy Meter IC

FDS_6533_6534_004
71M6533/G/H and 71M6534/H Data Sheet
6.9 Pin Descriptions
Pins marked with an asterisk (e.g. V2*) are only available on the 71M6534.
6.9.1 Power and Ground Pins
Table 91: Power and Ground Pins
Name
GNDA
GNDD
V3P3A
V3P3SYS
V3P3D
VBAT
V2P5
Type
P
P
P
P
O
P
O
Circuit
–
–
–
–
13
12
10
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 3.3 V power supply should be connected to this
pin, must be the same voltage as V3P3SYS.
System 3.3 V supply. This pin should be connected to a 3.3 V power supply.
Auxiliary voltage output of the chip. In mission mode, this pin is con-
nected to V3P3SYS by the internal selection switch. In BROWNOUT
mode, it is internally connected to VBAT. V3P3D is floating in LCD and
SLEEP mode. A bypass capacitor to ground should not exceed 0.1 µF.
Battery backup and oscillator power supply. A battery or super-capacitor
is to be connected between VBAT and GNDD. If no battery is used,
connect VBAT to V3P3SYS.
Output of the internal 2.5 V regulator. A 0.1 µF capacitor to GNDA
should be connected to this pin.
6.9.2 Analog Pins
Table 92: Analog Pins
Name Type Circuit Description
IAP/IAN,
IBP/IBN,
ICP/ICN
I
IDP/IDN
VA, VB,
VC
I
V1
I
V2*
I
VBIAS* O
VREF
O
XIN
XOUT
I
Differential or single-ended Line Current Sense Inputs: These pins are voltage
6 inputs to the internal A/D converter. Typically, they are connected to the
outputs of current sensors. Unused pins must be tied to V3P3A.
Line Voltage Sense Inputs: These pins are voltage inputs to the internal
6 A/D converter. Typically, they are connected to the outputs of resistor
dividers. Unused pins must be tied to V3P3A.
Comparator Input: This pin is a voltage input to the internal comparator.
The voltage applied to the pin is compared to the internal BIAS voltage
7 (1.6 V). If the input voltage is above VBIAS, the comparator output will be
high (1). If the comparator output is low, a voltage fault will occur. A series
5 kΩ resistor should be connected from V1 to the resistor divider.
Comparator Input (71M6534 only): This pin is a voltage input to an internal
7
comparator. The voltage applied to this pin is compared to an internal
reference voltage (VBIAS). If the input voltage is above VBIAS, the
comparator output will be high (1).
9 Low-impedance output for use in biasing current sensors and voltage dividers.
9
Voltage Reference for the ADC. This pin should be left unconnected
(floating).
Crystal Inputs: A 32 kHz crystal should be connected across these pins.
Typically, a 33 pF capacitor is also connected from XIN to GNDA and a
7 pF capacitor (alternatively, 10 pF to 15 pF) is connected from XOUT
8 to GNDA. It is important to minimize the capacitance between these pins.
See the crystal manufacturer datasheet for details.
If an external clock is used, a 150 mV (p-p) clock signal should be applied
to XIN, and XOUT should be left unconnected.
Pin types: P = Power, O = Output, I = Input, I/O = Input/Output
The circuit number denotes the equivalent circuit, as specified under Section 6.9.4 I/O Equivalent Circuits.
Rev 2
123