Microchip MCP3905 Handleiding

Microchip Niet gecategoriseerd MCP3905

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© 2009 Microchip Technology Inc. DS21948E-page 1
MCP3905/06
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 IDD 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
HFOUT for meter calibration
US Patents Pending
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 IB and IMAX 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
Functional Block Diagram
FOUT0
DGND
NEG
1
2
3
4
24
23
22
21
20
19
18
17
5
6
7
8
FOUT1
NC
OSC2
OSC1
DVDD
HPF
AVDD
NC
CH0+
CH0-
CH1-
CH1+
HFOUT
16
9G0
MCLR
15
14
10
11
G1
F0
REFIN/OUT
AGND
1312 F1
F2
24-Pin SSOP
16-bit
ΔΣ ADC
MCLR
+
–
CH0+
CH0-
Reference
2.4V
+
–
CH1+
CH1-
HPF1
LPF1 E-to-F
conversion
REFIN/
FOUT1
HFOUT
G0 G1
F2 F1
FOUT0
OSC1 OSC2
OUT
NEG
HPF
F0
Multi-level
16-bit
ΔΣ ADC
Multi-level
X
HPF1
PGA
POR
Energy-Metering ICs with Active (Real) Power Pulse Output
Obsolete Device
Replacement Device:
MCP3905A/MCP3906A
MCP3905/06
DS21948E-page 2 © 2009 Microchip Technology Inc.
NOTES:
© 2009 Microchip Technology Inc. DS21948E-page 3
MCP3905/06
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VDD...................................................................................7.0V
Digital inputs and outputs w.r.t. A
GND........ -0.6V to VDD +0.6V
Analog input w.r.t. AGND..................................... ....-6V to +6V
VREF input w.r.t. AGND.............................. -0.6V to V
DD +0.6V
Storage temperature .....................................-65°C to +150°C
Ambient temp. with power applied ................-65°C to +125°C
Soldering temperature of leads (10 seconds) ............. +300°C
ESD on the analog inputs (HBM,MM).................5.0 kV, 500V
ESD on all other pins (HBM,MM)........................5.0 kV, 500V
† Notice: Stresses above those listed under "Maximum
Ratings" may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operation listings of this specification is not implied. Exposure
to maximum rating conditions for extended periods may affect
device reliability.
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all parameters apply at AV
DD
= DVDD = 4.5V – 5.5V,
Internal VREF
, HPF turned on (AC mode), AGND, DGND = 0V, MCLK = 3.58 MHz; TA
= -40°C to +85°C.
Parameter Sym Min Typ. Max Units Comment
Overall Measurement Accuracy
Energy Measurement Error E — 0.1 — % FOUT Channel 0 swings 1:500 range,
MCP3905 only (Note 1, Note 4)
— 0.1 — % FOUT Channel 0 swings 1:1000 range,
MCP3906 only (Note 1, Note 4)
No-Load Threshold/
Minimum Load
NLT — 0.0015 — % FOUT
Max.
Disabled when F2, F1, F0 = 0, 1, 1
( )Note 5, Note 6
Phase Delay Between
Channels
— — 1/MCLK s HPF = 0 and 1, < 1 MCLK
( )Note 4, Note 6, Note 7
AC Power Supply
Rejection Ratio
(Output Frequency Variation)
AC PSRR — 0.01 — % FOUT F2, F1, F0 = 0, 1, 1 (Note 3)
DC Power Supply
Rejection Ratio
(Output Frequency Variation)
DC PSRR — 0.01 — % FOUT HPF = 1, Gain = 1 (Note 3)
System Gain Error — 3 10 % FOUT Note 2, Note 5
ADC/PGA Specifications
Offset Error VOS — 2 5 mV Referred to Input
Gain Error Match — 0.5 — % FOUT Note 8
Internal Voltage Reference
Voltage — 2.4 — V
Tolerance — ±2 — %
Tempco — 15 — ppm/°C
Note 1: Measurement error = (Energy Measured By Device - True Energy)/True Energy * 100%. Accuracy is
measured with signal (±660 mV) on Channel 1. FOUT0, FOUT1 pulse outputs. Valid from 45 Hz to 65 Hz.
See Section 2.0 “Typical Performance Curves” for higher frequencies and increased dynamic range.
2: Does not include internal VREF. Gain = 1, CH0 = 470 mVDC, CH1 = 660 mVDC, difference between
measured output frequency and expected transfer function.
3: Percent of HFOUT output frequency variation; Includes external V
REF = 2.5V, CH1 = 100 mVRMS @
50 Hz, CH2 = 100 mVRMS @ 50 Hz, AVDD = 5V + 1V
pp @ 100 Hz. DC PSRR: 5V ±500 mV.
4: Error applies down to 60° lead (PF = 0.5 capacitive) and 60° lag (PF = 0.5 inductive).
5: Refer to Section 4.0 “Device Overview” for complete description.
6: Specified by characterization, not production tested.
7: 1 MCLK period at 3.58 MHz is equivalent to less than <0.005 degrees at 50 or 60 Hz.
8: Gain error match is measured from CH0 G = 1 to any other gain setting.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MCP3905

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