MCP3909_09 Datasheet, PDF (1/44 Pages) Microchip Technology – Energy Metering IC with SPI Interface and Active Power Pulse Output

MCP3909
Energy Metering IC with SPI Interface and Active Power Pulse Output
Features
• Supports IEC 62053 International Energy
Metering Specification and legacy IEC 1036/
61036/687 Specifications
• 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 (typ.) both channels
• 0.1% typical active energy measurement error
over 1000:1 dynamic range
• PGA for small signal inputs 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
• Industrial Temperature Range: -40°C to +85°C
Functional Block Diagram
G0 G1
HPF
CH0+
CH0-
REFIN/
OUT
4 kΩ
+
PGA
–
16-bit
Multi-level
DS ADC
2.4V
Reference
HPF1
16
16
Description
The MCP3909 device is an energy-metering IC
designed to support the IEC 62053 international
metering standard specification. It supplies a frequency
output proportional to the average active real power,
with simultaneous serial access to ADC channels and
multiplier output data. This output waveform data is
available 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
measurements 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
reliability is available in the industry standard 24-lead
SSOP pinout.
Package Type
24-Lead
SSOP
DV_DD 1
HPF 2
AV_DD 3
NC 4
CH0+ 5
CHO- 6
CH1- 7
CH1+ 8
MCLR 9
REFIN / OUT 10
A_GND 11
F2 / SCK 12
24 F_OUT0
23 F_OUT1
22 HF_OUT
21 D_GND
20 NEG / SDO
19 NC
18 _CLKOUT
17 CLKIN
16 G0
15 _G1
14 F0 / CS
13 F1 / SDI
16
Serial Control
And Output
Buffers
F2/SCK F1/SDI F0/CS NEG/SDO
Dual Functionality Pin
Control
SPI
Interface
MCLR
CH1+
+
CH1-
–
Clock
Sub-system
OSC1 OSC2
16-bit
Multi-level
DS ADC
16
HPF1
X
20
LPF1
HF_OUT
Active Power
DTF
conversion
F_OUT0 F_OUT1
Stepper
Motor
Output Drive
for
Active Power
© 2009 Microchip Technology Inc.
DS22025B-page 1