MCP3905_09 Datasheet, PDF (1/30 Pages) Microchip Technology – Energy-Metering ICs with Active (Real) Power Pulse Output

Obsolete Device
Replacement Device:
MCP3905A/MCP3906A
MCP3905/06
Energy-Metering ICs with Active (Real) Power Pulse Output
Features
• Supplies active (real) power measurement for
single-phase, residential energy-metering
• Supports the IEC 62053 International Energy
Metering Specification and legacy IEC 1036/
61036/687 Specifications
• Two multi-bit, Digital-to-Analog Converters
(DACs), second-order, 16-bit, Delta-Sigma
Analog-to-Digital Converters (ADCs)
• 0.1% typical measurement error over 500:1
dynamic range (MCP3905)
• 0.1% typical measurement error over 1000:1
dynamic range (MCP3906)
• Programmable Gain Amplifier (PGA) for small-
signal inputs supports low-value shunt current
sensor
- 16:1 PGA - MCP3905
- 32:1 PGA - MCP3906
• 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 (typical)
• Tamper output pin for negative power indication
• Industrial Temperature Range: -40°C to +85°C
• Supplies instantaneous active (real) power on
HF_OUT for meter calibration
US Patents Pending
Functional Block Diagram
G0 G1
CH0+
CH0-
REFIN/
OUT
CH1+
CH1-
+
PGA
–
16-bit
Multi-level
ΔΣ ADC
2.4V
Reference
+
–
16-bit
Multi-level
ΔΣ ADC
HPF
HPF1
HPF1
Description
The MCP3905/06 devices are energy-metering ICs
designed to support the IEC 62053 International
Metering Standard Specification. They supply a
frequency output proportional to the average active
(real) power, as well as a higher-frequency output
proportional to the instantaneous power for meter
calibration. They include two 16-bit, delta-sigma ADCs
for a wide range of I_B and I_MAX currents and/or small
shunt (< 200 µOhms) meter designs. It includes an
ultra-low drift voltage reference with < 15 ppm/°C
through a specially designed band gap temperature
curve for the minimum gradient across the industrial
temperature range. A fixed-function DSP block is
on-chip for active (real) power calculation. Strong
output drive for mechanical counters are on-chip to
reduce field failures and mechanical counter sticking. A
no-load threshold block prevents any current creep
measurements. A Power-On Reset (POR) block
restricts meter performance during low-voltage
situations. These accurate energy-metering ICs with
high field reliability are available in the industry-
standard pinout.
Package Type
24-Pin SSOP
DV_DD 1
HPF 2
AV_DD 3
NC 4
CH0+ 5
CH0- 6
CH1- 7
CH1+ 8
MCLR 9
REFIN/OUT 10
A_GND 11
F2 12
24 F_OUT0
23 F_OUT1
22 HF_OUT
21 D_GND
20 NEG
19 NC
18 _OSC2
17 OSC1
16 G0
15 G1
14 F0
13 F1
OSC1 OSC2
HF_OUT
F2 F1 F0
F_OUT0
F_OUT1
NEG
X
LPF1
E-to-F
conversion
POR
MCLR
© 2009 Microchip Technology Inc.
DS21948E-page 1