MAX71020(2012) 查看數據表（PDF） - Maxim Integrated
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MAX71020 Datasheet PDF : 37 Pages
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MAX71020
Single-Chip Electricity Meter AFE
Pin Description
(Pin types: P = Power, O = Output, I = Input, I/O = Input/Output. The circuit number denotes the equivalent circuit, as
specified under Figure 1).
PIN
NAME
POWER AND GROUND PINS
2
GNDA
TYPE CIRCUIT
DESCRIPTION
P
— Analog Ground. GNDA should be connected directly to the ground plane.
3
V3P3A
P
—
Analog Power Supply. A 3.3V power supply should be connected to
V3P3A. V3P3A must be the same voltage as V3P3SYS.
12
GNDD
P
— Digital Ground. GNDD should be connected directly to the ground plane.
23
VDD
O
—
Output of the 1.8V Regulator. A 0.1µF bypass capacitor to ground
should be connected to this pin.
24
V3P3SYS
P
—
System 3.3V Supply. V3P3SYS should be connected to a 3.3V power
supply.
ANALOG PINS
7, 6
IAP, IAN
I
5, 4
IBP, IBN
Differential or Single-Ended Line Current-Sense Inputs. These pins are
6
voltage inputs to the internal ADC. Typically, these pins are connected
to the outputs of current sensors. Unused pins must be tied to GNDA.
1, 28
VA, VB
I
Line Voltage Sense Inputs. VA/VB are voltage inputs to the internal
6
ADC. Typically, the pins are connected to the outputs of resistor-
dividers. Unused pins must be tied to GNDA.
25
XIN
I
26
XOUT
O
DIGITAL PINS
22
DIO0/WPULSE
21
DIO1/VPULSE
I/O
20
DIO2/XPULSE
11
DIO3/YPULSE
8, 27
TEST, TEST0
I
9
RESETZ
I
13
SPI_CSZ
I
14
SPI_DO
O
15
SPI_DI
I
16
SPI_CLK
I
19
INTZ
O
OTHER PIN
10
VPP
I
8
Crystal Inputs. A 9.8304MHz crystal should be connected to XIN and
XOUT.
Multiple-Use Pins. Configurable as DIO. Alternative functions with
3, 4
proper selection of associated registers are:
DIO0 = WPULSE
DIO1 = VPULSE
3
Connect to GNDD
3
Active-Low Reset
3
4
SPI Interface
3
3
4
Active-Low Interrupt Request
— Connect to GNDD
7
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