Datasheet
90E36A 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 Phase A Current
I1N: Negative Input for Phase A Current
These pins are differential inputs for phase A current.
Note: I1 to phase A and I3 to phase C mapping can be swapped by configuring the I1I3Swap
bit (b13, MMode0).
I2P
I2N
5
6
I Analog
I2P: Positive Input for Phase B Current
I2N: Negative Input for Phase B Current
These pins are differential inputs for phase B current.
I3P
I3N
7
8
I Analog
I3P: Positive Input for Phase C Current
I3N: Negative Input for Phase C Current
These pins are differential inputs for phase C current.
Note: I1 to phase A and I3 to phase C mapping can be swapped by configuring the I1I3Swap
bit (b13, MMode0).
I4P
I4N
9
10
I Analog
I4P: Positive Input for N Line Current
I4N: Negative Input for N Line Current
These pins are differential inputs for N line current.
Vref 11 O Analog
Vref: Output Pin for Reference Voltage
This pin should be decoupled with a 10μF capacitor, possibly a 0.1μF ceramic capacitor and
a 1nF ceramic capacitor.
V1P
V1N
13
14
I Analog
V1P: Positive Input for Phase A Voltage
V1N: Negative Input for Phase A Voltage
These pins are differential inputs for phase A voltage.
V2P
V2N
15
16
I Analog
V2P: Positive Input for Phase B Voltage
V2N: Negative Input for Phase B Voltage
These pins are differential inputs for phase B voltage.
V3P
V3N
17
18
I Analog
V3P: Positive Input for Phase C Voltage
V3N: Negative Input for Phase C Voltage
These pins are differential inputs for phase C voltage.
OSCI 20 I OSC
OSCI: External Crystal Input
OSCO: External Crystal Output
A 16.384 MHz crystal is connected between OSCI and OSCO. There are two on-chip capac-
itor, therefore no need of external capacitors.
OSCO 21 O OSC
ZX0
ZX1
ZX2
22
23
24
O LVTTL
ZX2/ZX1/ZX0:Zero-Crossing Output
These pins are asserted when voltage or current crosses zero. Zero-crossing mode can be
configured by the ZXConfig register (07H).
CF1 25 O LVTTL
CF1: (all-phase-sum total) Active Energy Pulse Output