MCP3905A Datasheet, PDF (1/26 Pages) Microchip Technology – Energy Metering ICs with Active Real Power Pulse Output

MCP3905A/05L/06A
Energy Metering ICs with Active Real Power Pulse Output
Features
• Supplies active (real) power measurement for
single-phase, residential energy metering
• Supports IEC 62053 International Energy
Metering Specification and legacy IEC
1036/61036/687 Specifications
• Two multi-bit, DAC, second-order, 16-bit, Delta-
Sigma Analog-to-Digital Converters (ADCs)
• Reduced pulse width of calibration output
frequency and mechanical counter drive for low
power meter designs (MCP3905L)
• Increased output frequency constant options for
meter design (MCP3905L)
• 0.1% typical measurement error over 500:1
dynamic range (MCP3905A / MCP3905L)
• 0.1% typical measurement error over 1000:1
dynamic range (MCP3906A)
• Programmable Gain Amplifier (PGA) for small sig-
nal inputs supports low value shunt current sen-
sor:
- 16:1 PGA - MCP3905A / MCP3905L
- 32:1 PGA - MCP3906A
• Ultra-low drift on-chip reference: 15 ppm/°C (typ.)
• Direct drive for electromagnetic mechanical
counter and two-phase stepper motors
• Low I_DD of 4 mA (typ.)
• Tamper output pin for negative power indication
• Industrial Temperature Range: -40°C to +85°C
• Supplies instantaneous real power on HF_OUT for
meter calibration
Functional Block Diagram
G0 G1
HPF
CH0+
CH0-
REFIN/
OUT
CH1+
CH1-
+
PGA
–
16-bit
Multi-level
ΔΣ ADC
HPF1
2.4V
Reference
+
16-bit
–
Multi-level
ΔΣ ADC
HPF1
Description
The MCP3905A/05L/06A 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. The MCP3905L offers reduced pulse width
of calibration output frequency and mechanical counter
drive for lower power meter designs. 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. 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
© 2006 Microchip Technology Inc.
DS22011A-page 1