Datasheet

90E32AS ENHANCED POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
Pin Description 10 April 2, 2013
2 PIN DESCRIPTION
Table-1 Pin Description
Name Pin No. I/O Type Description
Reset 41
I
LVTTL
Reset: Reset Pin (active low)
This pin should connect to ground through a 0.1 μF filter capacitor and a 10kΩ resistor to
VDD. In application it can also directly connect to one output pin from microcontroller (MCU).
AVDD 1 I Power
AVDD: Analog Power Supply
This pin provides power supply to the analog part. This pin should connect to DVDD and be
decoupled with a 0.1μF capacitor.
DVDD 48 I Power
DVDD: Digital Power Supply
This pin provides power supply to the digital part. It should be decoupled with a 10μF capac-
itor and a 0.1μF capacitor.
VDD18 42, 43 P Power
VDD18: Digital Power Supply (1.8 V)
These two pins should be connected together and connected to ground through a 10μF
capacitor.
DGND 19, 44, 47 I Power
DGND: Digital Ground
AGND 2, 12 I Power
AGND: Analog Ground
I1P
I1N
3
4
I Analog
I1P: Positive Input for Analog ADC Channel
I1N: Negative Input for Analog ADC Channel
These pins are differential inputs for analog ADC channel.
These 6 analog ADC channels can be flexibly mapped, refer to 3.4 Analog/digital Channel
Mapping.
1
I2P
I2N
5
6
I Analog
I2P: Positive Input for Analog ADC Channel
I2N: Negative Input for Analog ADC Channel
These pins are differential inputs for analog ADC channel.
These 6 analog ADC channels can be flexibly mapped, refer to 3.4 Analog/digital Channel
Mapping.
1
I3P
I3N
7
8
I Analog
I3P: Positive Input for Analog ADC Channel
I3N: Negative Input for Analog ADC Channel
These pins are differential inputs for analog ADC channel.
These 6 analog ADC channels can be flexibly mapped, refer to 3.4 Analog/digital Channel
Mapping.
1
Vref 11 O Analog
Vref: Output Pin for Reference Voltage
This pin should be decoupled with a 4.7μF capacitor, it is better to add a 0.1μF ceramic
capacitor.
V1P
V1N
13
14
I Analog
V1P: Positive Input for Analog ADC Channel
V1N: Negative Input for Analog ADC Channel
These pins are differential inputs for analog ADC channel.
These 6 analog ADC channels can be flexibly mapped, refer to 3.4 Analog/digital Channel
Mapping.
1
V2P
V2N
15
16
I Analog
V2P: Positive Input for Analog ADC Channel
V2N: Negative Input for Analog ADC Channel
These pins are differential inputs for analog ADC channel.
These 6 analog ADC channels can be flexibly mapped, refer to 3.4 Analog/digital Channel
Mapping.
1
V3P
V3N
17
18
I Analog
V3P: Positive Input for Analog ADC Channel
V3N: Negative Input for Analog ADC Channel
These pins are differential inputs for analog ADC channel.
These 6 analog ADC channels can be flexibly mapped, refer to 3.4 Analog/digital Channel
Mapping.
1