Datasheet

2006-2012 Microchip Technology Inc. DS22025C-page 1
MCP3909
Features
Supports IEC 62053 International Energy
Metering Specification
Digital Waveform Data Access Through SPI
Interface
- 16-bit Dual ADC Output Data Words
- 20-bit Multiplier Output Data Word
Dual Functionality Pins Support Serial Interface
Access and Simultaneous Active Power Pulse
Output
Two 16-bit Second Order Delta-sigma Analog-
to-Digital Converters (ADCs) with Multi-bit DAC
- 81 dB SINAD (typical) on Both Channels
0.1% Typical Active Energy Measurement Error
Over 1000:1 Dynamic Range
PGA for Small Signal Input Supports Low Value
Shunt Current Sensor
Ultra-low Drift On-chip Reference,15 ppm/°C
(typical)
Direct Drive for Electromagnetic Mechanical
Counter and Two-phase Stepper Motors
•Low I
DD
of 4 mA (maximum)
Tamper Output Pin for Negative Power Indication
Temperature Ranges:
- Industrial: -40°C to +85°C
- Extended: -40°C to +125°C
Description
The MCP3909 device is an energy-metering IC
designed to support the IEC 62053 international meter-
ing standard specification. It supplies a frequency out-
put proportional to the average active real power, with
simultaneous serial access to ADC channels and mul-
tiplier output data. This output waveform data is avail-
able at up to 14 kHz with 16-bit ADC output and 20-bit
multiplier output words. The 16-bit, delta-sigma ADCs
allow for a wide range of I
B
and I
MAX
currents and/or
small shunt (<200 µOhms) meter designs. A no-load
threshold block prevents any current creep measure-
ments for the active power pulse outputs.
The integrated on-chip voltage reference has an
ultra-low temperature drift of 15 ppm per degree C.
This accurate energy metering IC with high field reli-
ability is available in the industry standard 24-lead
SSOP pinout.
Package Type
F
OUT0
D
GND
NEG/SDO
1
2
3
4
24
23
22
21
20
19
18
17
5
6
7
8
F
OUT1
NC
CLKOUT
CLKIN
DV
DD
HPF
AV
DD
NC
CH0+
CH0-
CH1-
CH1+
HF
OUT
16
9G0MCLR
15
14
10
11
G1
F0/C
S
REFIN/OUT
A
GND
1312 F1/SDI F2/SCK
24-Lead
SSOP
Energy Metering IC with SPI Interface and Active Power Pulse Output

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