Obsolete Device
Replacement Device:
MCP3905A/MCP3906A
MCP3905/06
Energy-Metering ICs with Active (Real) Power Pulse Output
Features
Description
• 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 smallsignal 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
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 industrystandard pinout.
Package Type
DVDD
HPF
AVDD
NC
CH0+
CH0CH1CH1+
MCLR
REFIN/OUT
AGND
F2
24-Pin SSOP
US Patents Pending
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
FOUT0
FOUT1
HFOUT
DGND
NEG
NC
OSC2
OSC1
G0
G1
F0
F1
Functional Block Diagram
G0 G1
HPF
OSC1 OSC2
HFOUT
CH0+
CH0-
+
PGA
–
16-bit
Multi-level
ΔΣ ADC
REFIN/
OUT
X
2.4V
Reference
CH1+
+
CH1-
–
© 2009 Microchip Technology Inc.
F2
HPF1
16-bit
Multi-level
ΔΣ ADC
HPF1
F1
F0
FOUT0
FOUT1
NEG
E-to-F
conversion
LPF1
POR
MCLR
DS21948E-page 1
MCP3905/06
NOTES:
DS21948E-page 2
© 2009 Microchip Technology Inc.
MCP3905/06
1.0
ELECTRICAL
CHARACTERISTICS
† 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.
Absolute Maximum Ratings †
VDD...................................................................................7.0V
Digital inputs and outputs w.r.t. AGND ........ -0.6V to VDD +0.6V
Analog input w.r.t. AGND ..................................... ....-6V to +6V
VREF input w.r.t. AGND .............................. -0.6V to VDD +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
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all parameters apply at AVDD = 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
Overall Measurement Accuracy
Energy Measurement Error
E
Min
—
—
Typ.
Max
Units
Comment
% 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)
0.0015
—
% FOUT Disabled when F2, F1, F0 = 0, 1, 1
Max.
(Note 5, Note 6)
—
1/MCLK
s
HPF = 0 and 1, < 1 MCLK
(Note 4, Note 6, Note 7)
0.01
—
% FOUT F2, F1, F0 = 0, 1, 1 (Note 3)
0.1
—
No-Load Threshold/
NLT
—
Minimum Load
Phase Delay Between
—
Channels
AC Power Supply
AC PSRR
—
Rejection Ratio
(Output Frequency Variation)
DC Power Supply
DC PSRR
—
0.01
—
% FOUT HPF = 1, Gain = 1 (Note 3)
Rejection Ratio
(Output Frequency Variation)
System Gain Error
—
3
10
% FOUT Note 2, Note 5
ADC/PGA Specifications
—
2
5
mV
Referred to Input
Offset Error
VOS
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 VREF = 2.5V, CH1 = 100 mVRMS @
50 Hz, CH2 = 100 mVRMS @ 50 Hz, AVDD = 5V + 1Vpp @ 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.
© 2009 Microchip Technology Inc.
DS21948E-page 3
MCP3905/06
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, all parameters apply at AVDD = 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
Reference Input
Input Range
2.2
—
2.6
V
Input Impedance
3.2
—
—
kΩ
Input Capacitance
—
—
10
pF
Analog Inputs
Maximum Signal Level
—
—
±1
V
CH0+,CH0-,CH1+,CH1- to AGND
Differential Input Voltage
—
—
±470/G
mV
G = PGA Gain on Channel 0
Range Channel 0
Differential Input Voltage
—
—
±660
mV
Range Channel 1
Input Impedance
390
—
—
kΩ
Proportional to 1/MCLK frequency
Bandwidth
—
14
—
kHz
Proportional to MCLK frequency,
(Notch Frequency)
MCLK/256
Oscillator Input
Frequency Range
MCLK
1
—
4
MHz
Power Specifications
Operating Voltage
4.5
—
5.5
V
AVDD, DVDD
IDD,A
IDD,A
—
2.7
3.0
mA
AVDD pin only
IDD,D
—
1.2
2.0
mA
DVDD pin only
IDD,D
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 VREF = 2.5V, CH1 = 100 mVRMS @
50 Hz, CH2 = 100 mVRMS @ 50 Hz, AVDD = 5V + 1Vpp @ 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.
TEMPERATURE CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 4.5V – 5.5V, AGND, DGND = 0V.
Parameters
Sym
Min
Typ
Max
Units
Specified Temperature Range
TA
-40
Operating Temperature Range
TA
-40
—
+85
°C
—
+125
°C
Storage Temperature Range
TA
-65
—
+150
°C
θJA
—
73
—
°C/W
Conditions
Temperature Ranges
Note
Thermal Package Resistances
Thermal Resistance, 24L-SSOP
Note:
The MCP3905/06 operate over this extended temperature range, but with reduced performance. In any
case, the Junction Temperature (TJ) must not exceed the Absolute Maximum specification of +150°C.
DS21948E-page 4
© 2009 Microchip Technology Inc.
MCP3905/06
TIMING CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all parameters apply at AVDD = DVDD = 4.5V – 5.5V,
AGND, DGND = 0V, MCLK = 3.58 MHz; TA = -40°C to +85°C.
Parameter
Sym
Min
Typ
Max
Units
Comment
FOUT0 and FOUT1 Pulse Width
(Logic-Low)
tFW
—
275
—
ms
984376 MCLK periods
(Note 1)
HFOUT Pulse Width
tHW
—
90
—
ms
322160 MCLK periods
(Note 2)
FOUT0 and FOUT1 Pulse Period
tFP
Refer to Equation 4-1
s
HFOUT Pulse Period
tHP
Refer to Equation 4-2
s
FOUT0 to FOUT1 Falling-Edge Time
tFS2
Frequency Output
—
0.5 tFP
—
FOUT0 to FOUT1 Min Separation
tFS
—
4/MCLK
—
FOUT0 and FOUT1 Output High Voltage
VOH
4.5
—
—
V
IOH = 10 mA, DVDD = 5.0V
IOL = 10 mA, DVDD = 5.0V
FOUT0 and FOUT1 Output Low Voltage
VOL
—
—
0.5
V
HFOUT Output High Voltage
VOH
4.0
—
—
V
IOH = 5 mA, DVDD = 5.0V
HFOUT Output Low Voltage
VOL
—
—
0.5
V
IOL = 5 mA, DVDD = 5.0V
High-Level Input Voltage
(All Digital Input Pins)
VIH
2.4
—
—
V
DVDD = 5.0V
Low-Level Input Voltage
(All Digital Input Pins)
VIL
—
—
0.85
V
DVDD = 5.0V
Input Leakage Current
—
—
µA
VIN = 0, VIN = DVDD
Pin Capacitance
—
—
pF
Note 3
Note 1:
2:
3:
±3
10
If output pulse period (tFP) falls below 984376*2 MCLK periods, then tFW = 1/2 tFP.
If output pulse period (tHP) falls below 322160*2 MCLK periods, then tHW = 1/2 tHP.
Specified by characterization, not production tested.
tFP
tFW
FOUT0
tFS
tFS2
FOUT1
tHW
HFOUT
tHP
NEG
FIGURE 1-1:
Output Timings for Pulse Outputs and Negative Power Pin.
© 2009 Microchip Technology Inc.
DS21948E-page 5
MCP3905/06
NOTES:
DS21948E-page 6
© 2009 Microchip Technology Inc.
MCP3905/06
2.0
TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0.0000
0.6
+85°C
Measurement Error
Measurement Error
Note: Unless otherwise specified, DVDD, AVDD = 5V; AGND, DGND = 0V; VREF = Internal, HPF = 1 (AC mode),
MCLK = 3.58 MHz.
+25°C
-40°C
0.5
0.4
0.2
0.1
-0.1
0.0001
0.0010
0.0100
-0.3
0.0000
0.1000
Measurement Error,
+25°C
0.1
0
-0.1
- 40°C
Measurement Error
Measurement Error
0.3
0.2
-0.2
0.0001
0.0010
0.0100
0.1000
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
0.0000
FIGURE 2-2:
Measurement Error,
Gain = 16, PF = 1.
+25°C
0.2
0
- 40°C
-0.2
-0.4
-0.6
0.0100
CH1 Vp-p Amplitude (V)
FIGURE 2-3:
Measurement Error,
Gain = 32, PF = 1.
© 2009 Microchip Technology Inc.
0.1000
Measurement Error
+85°C
0.4
0.0010
0.1000
+85°C
+25°C
-40°C
0.0001
0.0010
0.0100
0.1000
FIGURE 2-5:
Measurement Error,
Gain = 16, PF = 0.5.
0.8
0.0001
0.0100
CH1 Vp-p Amplitude (V)
CH1 Vp-p Amplitude (V)
0.6
0.0010
FIGURE 2-4:
Measurement Error,
Gain = 8, PF = 0.5.
+85°C
0.4
0.0001
CH1 Vp-p Amplitude (V)
0.5
Measurement Error
-40°C
-0.2
FIGURE 2-1:
Gain = 8, PF = 1.
-0.8
0.0000
+25°C
0
CH1 Vp-p Amplitude (V)
-0.3
0.0000
+85°C
0.3
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0.0000
+85°C
+25°C
-40°C
0.0001
0.0010
0.0100
0.1000
CH1 Vp-p Amplitude (V)
FIGURE 2-6:
Measurement Error,
Gain = 32, PF = 0.5.
DS21948E-page 7
MCP3905/06
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0.0001
Measurement Error
Measurement Error
Note: Unless otherwise specified, DVDD, AVDD = 5V; AGND, DGND = 0V; VREF = Internal, HPF = 1 (AC mode),
MCLK = 3.58 MHz.
+85°C
+25°C
- 40°C
0.0010
0.0100
0.1000
1.0000
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0.0001
CH0 Vp-p Amplitude (V)
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0.0001
Measurement Error,
+25°C
- 40°C
0.0100
0.1000
CH0 Vp-p Amplitude (V)
FIGURE 2-8:
Gain = 2, PF = 1.
DS21948E-page 8
-40°C
0.0010
0.0100
0.1000
1.0000
FIGURE 2-9:
Measurement Error,
Gain = 1, PF = + 0.5.
+85°C
0.0010
+25°C
CH1 Vp-p Amplitude (V)
Measurement Error
Measurement Error
FIGURE 2-7:
Gain = 1, PF = 1.
+85°C
Measurement Error,
1.0000
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0.0001
+85°C
+25°C
-40°C
0.0010
0.0100
0.1000
1.0000
CH1 Vp-p Amplitude (V)
FIGURE 2-10:
Measurement Error,
Gain = 2, PF = + 0.5.
© 2009 Microchip Technology Inc.
MCP3905/06
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
PF = 0.5
Occurance
PF = 1.0
45
50
55
60
65
70
4000
3500
3000
2500
2000
1500
1000
500
0
16384 Samples
Mean = - 1.28 mV
Std. dev = - 18.1 µV
-1.38E-03
-1.37E-03
-1.36E-03
-1.35E-03
-1.34E-03
-1.33E-03
-1.32E-03
-1.31E-03
-1.30E-03
-1.29E-03
-1.28E-03
-1.27E-03
-1.26E-03
-1.25E-03
-1.24E-03
-1.23E-03
-1.22E-03
% Error
Note: Unless otherwise specified, DVDD, AVDD = 5V; AGND, DGND = 0V; VREF = Internal, HPF = 1 (AC mode),
MCLK = 3.58 MHz.
75
Frequency (Hz)
FIGURE 2-11:
Input Frequency.
Bin (mV)
FIGURE 2-14:
Channel 0 Offset Error
(DC Mode, HPF Off), G = 16.
Measurement Error vs.
0.3
3000
2000
Measurement Error
Occurance
2500
16384 Samples
Mean = -1.57 mV
Std. Dev = 52.5 µV
1500
1000
500
0.2
0.1
VDD=5.0V
0
-0.1
VDD=4.5V
-0.2
-0.3
VDD=5.5V
-0.4
-0.5
0.0001
-1.38
-1.43
-1.47
-1.52
-1.56
-1.61
-1.65
-1.70
-1.75
0
0.0010
Channel 0 Offset (mV)
FIGURE 2-15:
(G = 16).
16384 Samples
Mean = -1.64 mV
Std. Dev = 17.4 µV
1.0000
Measurement Error vs. VDD
0.25
Measurement Error
Occurance
0.1000
0.3
1200
800
0.0100
CH0 Vp-p Amplitude (V)
FIGURE 2-12:
Channel 0 Offset Error
(DC Mode, HPF off), G = 1.
1000
VDD=4.75V
VDD=5.25V
600
400
200
0.2
VDD=4.75V
0.15
0.05
VDD=5.0V
0
VDD=5.25V
-0.05
-0.1
-1.59
-1.60
-1.62
-1.63
-1.64
-1.65
-1.66
-1.67
-1.68
-1.69
-1.71
0
Channel 0 Offset (mV)
FIGURE 2-13:
Channel 0 Offset Error
(DC Mode, HPF off), G = 8.
© 2009 Microchip Technology Inc.
VDD=4.5V
0.1
-0.15
0.0001
VDD=5.5V
0.0010
0.0100
0.1000
1.0000
CH0 Vp-p Amplitude (V)
FIGURE 2-16:
Measurement Error vs. VDD,
G = 16, External VREF .
DS21948E-page 9
MCP3905/06
0.3
0.3
0.2
0.2
0.1
+85°C
0
+25°C
- 40°C
-0.1
-0.2
-0.3
0.0001
0.0010
0.0100
0.1000
1.0000
CH0 Vp-p Amplitude (V)
Measurement Error
Measurement Error
Note: Unless otherwise specified, DVDD, AVDD = 5V; AGND, DGND = 0V; VREF = Internal, HPF = 1 (AC mode),
MCLK = 3.58 MHz.
+85°C
+25°C
0.1
0
- 40°C
-0.1
-0.2
-0.3
0.0000
0.0001
0.0010
0.0100
0.1000
CH1 Vp-p Amplitude (V)
FIGURE 2-17:
Measurement Error
with External VREF, (G = 1).
FIGURE 2-19:
Measurement Error
with External VREF (G = 16).
Measurement Error
0.3
0.2
+85°C
0.1
+25°C
0
-40°C
-0.1
-0.2
-0.3
0.0000
0.0001
0.0010
0.0100
0.1000
CH1 Vp-p Amplitude (V)
FIGURE 2-18:
Measurement Error
with External VREF, (G = 8).
DS21948E-page 10
© 2009 Microchip Technology Inc.
MCP3905/06
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
MCP3905/06
Symbol
Definition
SSOP-24
3.1
1
DVDD
Digital Power Supply Pin
2
HPF
High-Pass Filters Control Logic Pin
3
AVDD
Analog Power Supply Pin
4
NC
5
CH0+
No Connect
Non-Inverting Analog Input Pin for Channel 0 (Current Channel)
6
CH0-
Inverting Analog Input Pin for Channel 0 (Current Channel)
7
CH1-
Inverting Analog Input Pin for Channel 1 (Voltage Channel)
8
CH1+
Non-Inverting Analog Input Pin for Channel 1 (Voltage Channel)
9
MCLR
Master Clear Logic Input Pin
10
REFIN/OUT
11
AGND
12
F2
Frequency Control for HFOUT Logic Input Pin
13
F1
Frequency Control for FOUT0/1 Logic Input Pin
14
F0
Frequency Control for FOUT0/1 Logic Input Pin
15
G1
Gain Control Logic Input Pin
Voltage Reference Input/Output Pin
Analog Ground Pin, Return Path for internal analog circuitry
16
G0
17
OSC1
Oscillator Crystal Connection Pin or Clock Input Pin
Gain Control Logic Input Pin
18
OSC2
Oscillator Crystal Connection Pin or Clock Output Pin
19
NC
No Connect
20
NEG
Negative Power Logic Output Pin
21
DGND
Digital Ground Pin, Return Path for Internal Digital Circuitry
22
HFOUT
High-Frequency Logic Output Pin (Intended for Calibration)
23
FOUT1
Differential Mechanical Counter Logic Output Pin
24
FOUT0
Differential Mechanical Counter Logic Output Pin
Digital VDD (DVDD)
DVDD is the power supply pin for the digital circuitry
within the MCP3905/06.
DVDD requires appropriate bypass capacitors and
should be maintained to 5V ±10% for specified
operation. Please refer to Section 5.0 “Applications
Information”.
3.2
3.3
Analog VDD (AVDD)
AVDD is the power supply pin for the analog circuitry
within the MCP3905/06.
AVDD requires appropriate bypass capacitors and
should be maintained to 5V ±10% for specified
operation. Please refer to Section 5.0 “Applications
Information”.
High-Pass Filter Input Logic Pin
(HPF)
HPF controls the state of the high-pass filter in both
input channels. A logic ‘1’ enables both filters,
removing any DC offset coming from the system or the
device. A logic ‘0’ disables both filters, allowing DC
voltages to be measured.
© 2009 Microchip Technology Inc.
DS21948E-page 11
MCP3905/06
3.4
Current Channel (CH0-, CH0+)
CH0- and CH0+ are the fully differential analog voltage
input channels for the current measurement, containing
a PGA for small-signal input, such as shunt currentsensing. The linear and specified region of this channel
is dependant on the PGA gain. This corresponds to a
maximum differential voltage of ±470 mV/GAIN and
maximum absolute voltage, with respect to AGND, of
±1V. Up to ±6V can be applied to these pins without the
risk of permanent damage.
Refer to Section 1.0 “Electrical Characteristics”.
3.5
Voltage Channel (CH1-,CH1+)
CH1- and CH1+ are the fully differential analog voltage
input channels for the voltage measurement. The linear
and specified region of these channels have a
maximum differential voltage of ±660 mV and a
maximum absolute voltage of ±1V, with respect to
AGND. Up to ±6V can be applied to these pins without
the risk of permanent damage.
Refer to Section 1.0 “Electrical Characteristics”.
3.6
Master Clear (MCLR)
MCLR controls the reset for both delta-sigma ADCs, all
digital registers, the SINC filters for each channel and
all accumulators post multiplier. A logic ‘0’ resets all
registers and holds both ADCs in a Reset condition.
The charge stored in both ADCs is flushed and their
output is maintained to 0x0000h. The only block
consuming power on the digital power supply during
Reset is the oscillator circuit.
3.7
Reference (REFIN/OUT)
REFIN/OUT is the output for the internal 2.4V
reference. This reference has a typical temperature
coefficient of 15 ppm/°C and a tolerance of ±2%. In
addition, an external reference can also be used by
applying voltage to this pin within the specified range.
REFIN/OUT requires appropriate bypass capacitors to
AGND, even when using the internal reference only.
Refer to Section 5.0 “Applications Information”.
3.8
Analog Ground (AGND)
AGND is the ground connection to the internal analog
circuitry (ADCs, PGA, band gap reference, POR). To
ensure accuracy and noise cancellation, this pin must
be connected to the same ground as DGND, preferably
with a star connection. If an analog ground plane is
available, it is recommended that this device be tied to
this plane of the Printed Circuit Board (PCB). This
plane should also reference all other analog circuitry in
the system.
DS21948E-page 12
3.9
Frequency Control Logic Pins
(F2, F1, F0)
F2, F1 and F0 select the high-frequency output and
low-frequency output pin ranges by changing the value
of the constants FC and HFC used in the device transfer
function. FC and HFC are the frequency constants that
define the period of the output pulses for the device.
3.10
Gain Control Logic Pins (G1, G0)
G1 and G0 select the PGA gain on Channel 0 from
three different values: 1, 8 and 16.
3.11
Oscillator (OSC1, OSC2)
OSC1 and OSC2 provide the master clock for the
device. A resonant crystal or clock source with a similar
sinusoidal waveform must be placed across these pins
to ensure proper operation. The typical clock frequency
specified is 3.579545 MHz. However, the clock
frequency can be with the range of 1 MHz to 4 MHz
without disturbing measurement error. Appropriate
load capacitance should be connected to these pins for
proper operation.
A full-swing, single-ended clock source may be
connected to OSC1 with proper resistors in series to
ensure no ringing of the clock source due to fast
transient edges.
3.12
Negative Power Output Logic Pin
(NEG)
NEG detects the phase difference between the two
channels and will go to a logic ‘1’ state when the phase
difference is greater than 90° (i.e., when the measured
active (real) power is negative). The output state is
synchronous with the rising-edge of HFOUT and
maintains the logic ‘1’ until the active (real) power
becomes positive again and HFOUT shows a pulse.
3.13
Ground Connection (DGND)
DGND is the ground connection to the internal digital
circuitry (SINC filters, multiplier, HPF, LPF, Digital-toFrequency (DTF) converter and oscillator). To ensure
accuracy and noise cancellation, DGND must be
connected to the same ground as AGND, preferably
with a star connection. If a digital ground plane is
available, it is recommended that this device be tied to
this plane of the PCB. This plane should also reference
all other digital circuitry in the system.
© 2009 Microchip Technology Inc.
MCP3905/06
3.14
High-Frequency Output (HFOUT)
HFOUT is the high-frequency output of the device and
supplies the instantaneous real-power information. The
output is a periodic pulse output, with its period
proportional to the measured active (real) power, and to
the HFC constant defined by F0, F1 and F2 pin logic
states. This output is the preferred output for calibration
due to faster output frequencies, giving smaller
calibration times. Since this output gives instantaneous
active (real) power, the 2ω ripple on the output should
be noted. However, the average period will show
minimal drift.
3.15
Frequency Output (FOUT0, FOUT1)
FOUT0 and FOUT1 are the frequency outputs of the
device that supply the average real-power information.
The outputs are periodic pulse outputs, with its period
proportional to the measured active (real) power, and to
the Fc constant, defined by the F0 and F1 pin logic
states. These pins include high-output drive capability
for direct use of electromechanical counters and
2-phase stepper motors. Since this output supplies
average active (real) power, any 2ω ripple on the output
pulse period is minimal.
© 2009 Microchip Technology Inc.
DS21948E-page 13
MCP3905/06
NOTES:
DS21948E-page 14
© 2009 Microchip Technology Inc.
MCP3905/06
4.0
DEVICE OVERVIEW
The instantaneous power signal contains the realpower information; it is the DC component of the
instantaneous power. The averaging technique can be
used with both sinusoidal and non-sinusoidal
waveforms, as well as for all power factors. The
instantaneous power is thus low-pass filtered in order
to produce the instantaneous real-power signal.
The MCP3905/06 is an energy-metering IC that
supplies a frequency output proportional to active (real)
power, and higher frequency output proportional to the
instantaneous power for meter calibration. Both
channels use 16-bit, second-order, delta-sigma ADCs
that oversample the input at a frequency equal to
MCLK/4, allowing for wide dynamic range input signals.
A Programmable Gain Amplifier (PGA) increases the
usable range on the current input channel (Channel 0).
The calculation of the active (real) power, as well as the
filtering associated with this calculation, is performed in
the digital domain, ensuring better stability and drift
performance. Figure 4-1 represents the simplified
block diagram of the MCP3905/06, detailing its main
signal-processing blocks.
A DTF converter accumulates the instantaneous active
(real) power information to produce output pulses with a
frequency proportional to the average active (real)
power. The low-frequency pulses presented at the
FOUT0 and FOUT1 outputs are designed to drive
electromechanical counters and two-phase stepper
motors displaying the real-power energy consumed.
Each pulse corresponds to a fixed quantity of real
energy, selected by the F2, F1 and F0 logic settings. The
HFOUT output has a higher frequency setting and lower
integration period such that it can represent the
instantaneous active (real) power signal. Due to the
shorter accumulation time, it enables the user to
proceed to faster calibration under steady load
conditions (refer to Section 4.7 “FOUT0/1 and HFOUT
Output Frequencies”).
Two digital high-pass filters cancel the system offset on
both channels such that the real-power calculation
does not include any circuit or system offset. After
being high-pass filtered, the voltage and current signals
are multiplied to give the instantaneous power signal.
This signal does not contain the DC offset components,
such that the averaging technique can be efficiently
used to give the desired active (real) power output.
MCP3905/06
CH0+
+
CH0-
–
PGA
ΔΣ ADC
ANALOG
HPF
X
DIGITAL
..0101...
LPF
CH1+
+
CH1-
–
ΔΣ ADC
FOUT0
FOUT1
HFOUT
DTF
HPF
Frequency
Content
0
Input Signal
with System
Offset and
Line Frequency
FIGURE 4-1:
0
ADC Output
Code Contains
System and
ADC Offset
0
DC Offset
Removed
by HPF
0
Instantaneous
Power
0
Instantaneous
Active (Real) Power
Simplified MCP3905/06 Block Diagram with Frequency Contents.
© 2009 Microchip Technology Inc.
DS21948E-page 15
MCP3905/06
Analog Inputs
The MCP3905/06 analog inputs can be connected
directly to the current and voltage transducers (such as
shunts or current transformers). Each input pin is
protected by specialized Electrostatic Discharge (ESD)
structures that are certified to pass 5 kV HBM and
500V MM contact charge. These structures also allow
up to ±6V continuous voltage to be present at their
inputs without the risk of permanent damage.
Both channels have fully differential voltage inputs for
better noise performance. The absolute voltage at each
pin relative to AGND should be maintained in the ±1V
range during operation in order to ensure the measurement error performance. The common mode signals
should be adapted to respect both the previous
conditions and the differential input voltage range. For
best performance, the common mode signals should
be referenced to AGND.
The current channel comprises a PGA on the front-end
to allow for smaller signals to be measured without
additional signal conditioning. The maximum
differential voltage specified on Channel 0 is equal to
±470 mV/Gain (see Table 4-1). The maximum peak
voltage specified on Channel 1 is equal to ±660 mV.
TABLE 4-1:
MCP3905 GAIN SELECTIONS
G1
G0
CH0 Gain
Maximum
CH0 Voltage
0
0
1
1
0
1
0
1
1
2
8
16
±470 mV
±235 mV
±60 mV
±30 mV
TABLE 4-2:
MCP3906 GAIN SELECTIONS
G1
G0
CH0 Gain
Maximum
CH0 Voltage
0
0
1
1
0
1
0
1
1
32
8
16
±470 mV
±15 mV
±60 mV
±30 mV
4.2
16-Bit Delta-Sigma ADCs
The ADCs used in the MCP3905/06 for both current
and voltage channel measurements are delta-sigma
ADCs. They comprise a second-order, delta-sigma
modulator using a multi-bit DAC and a third-order SINC
filter. The delta-sigma architecture is very appropriate
for the applications targeted by the MCP3905, because
it is a waveform-oriented converter architecture that
can offer both high linearity and low distortion
performance throughout a wide input dynamic range. It
also creates minimal requirements for the anti-aliasing
filter design. The multi-bit architecture used in the ADC
minimizes quantization noise at the output of the
converters without disturbing the linearity.
DS21948E-page 16
Both ADCs have a 16-bit resolution, allowing wide input
dynamic range sensing. The oversampling ratio of both
converters is 64. Both converters are continuously
converting during normal operation. When the MCLR
pin is low, both converters will be in Reset and output
code 0x0000h. If the voltage at the inputs of the ADC is
larger than the specified range, the linearity is no longer
specified. However, the converters will continue to
produce output codes until their saturation point is
reached. The DC saturation point is around 700 mV for
Channel 0 and 1V for Channel 1, using internal voltage
reference.
The clocking signals for the ADCs are equally
distributed between the two channels in order to
minimize phase delays to less than 1 MCLK period
(see Section 3.2 “High-Pass Filter Input Logic Pin
(HPF)”). The SINC filters main notch is positioned at
MCLK/256 (14 kHz with MCLK = 3.58 MHz), allowing
the user to be able to measure wide harmonic content
on either channel. The magnitude response of the
SINC filter is shown in Figure 4-2.
Normal Mode Rejection (dB)
4.1
0
-20
-40
-60
-80
-100
-120
0
5
10
15
20
25
30
Frequency (kHz)
FIGURE 4-2:
SINC Filter Magnitude
Response (MCLK = 3.58 MHz).
4.3
Ultra-Low Drift VREF
The MCP3905/06 contains an internal voltage
reference source specially designed to minimize drift
over temperature. This internal VREF supplies
reference voltage to both current and voltage channel
ADCs. The typical value of this voltage reference is
2.4V, ±100 mV. The internal reference has a very low
typical temperature coefficient of ±15 ppm/°C, allowing
the output frequencies to have minimal variation with
respect to temperature since they are proportional to
(1/VREF)².
REFIN/OUT is the output pin for the voltage reference.
Appropriate bypass capacitors must be connected to
the REFIN/OUT pin for proper operation (see
Section 5.0 “Applications Information”). The
voltage reference source impedance is typically 4 kΩ,
which enables this voltage reference to be overdriven
by an external voltage reference source.
© 2009 Microchip Technology Inc.
MCP3905/06
4.4
Power-On Reset (POR)
The MCP3905/06 contains an internal POR circuit that
monitors analog supply voltage AVDD during operation.
This circuit ensures correct device startup at system
power-up/power-down events. The POR circuit has
built-in hysteresis and a timer to give a high degree of
immunity to potential ripple and noise on the power
supplies, allowing proper settling of the power supply
during power-up. A 0.1 µF decoupling capacitor should
be mounted as close as possible to the AVDD pin,
providing additional transient immunity (see
Section 5.0 “Applications Information”).
The threshold voltage is typically set at 4V, with a
tolerance of about ±5%. If the supply voltage falls below
this threshold, the MCP3905/06 will be held in a Reset
condition (equivalent to applying logic ‘0’ on the MCLR
pin). The typical hysteresis value is approximately
200 mV in order to prevent glitches on the power
supply.
Once a power-up event has occurred, an internal timer
prevents the part from outputting any pulse for
approximately 1s (with MCLK = 3.58 MHz), thereby
preventing potential metastability due to intermittent
resets caused by an unsettled regulated power supply.
Figure 4-3 illustrates the different conditions for a
power-up and a power-down event in the typical
conditions.
AVDD
5V
4.2V
4V
1s
0V
DEVICE
MODE
RESET
FIGURE 4-3:
NO
PULSE
OUT
4.5
High-Pass Filters and Multiplier
The active (real) power value is extracted from the DC
instantaneous power. Therefore, any DC offset
component present on Channel 0 and Channel 1
affects the DC component of the instantaneous power
and will cause the real-power calculation to be
erroneous. In order to remove DC offset components
from the instantaneous power signal, a high-pass filter
has been introduced on each channel. Since the
high-pass filtering introduces phase delay, identical
high-pass filters are implemented on both channels.
The filters are clocked by the same digital signal,
ensuring a phase difference between the two channels
of less than one MCLK period. Under typical conditions
(MCLK = 3.58 MHz), this phase difference is less than
0.005°, with a line frequency of 50 Hz. The cut-off
frequency of the filter (4.45 Hz) has been chosen to
induce minimal gain error at typical line frequencies,
allowing sufficient settling time for the desired
applications. The two high-pass filters can be disabled
by applying a logic ‘0’ to the HPF pin.
Normal Mode Rejection (dB)
If an external voltage reference source is connected to
the REFIN/OUT pin, the external voltage will be used
as the reference for both current and voltage channel
ADCs. The voltage across the source resistor will then
be the difference between the internal and external
voltage. The allowed input range for the external
voltage source goes from 2.2V to 2.6V for accurate
measurement error. A VREF value outside of this range
will cause additional heating and power consumption
due to the source resistor, which might affect
measurement error.
0
-5
-10
-15
-20
-25
-30
-35
-40
0.1
1
10
100
1000
Frequency (Hz)
FIGURE 4-4:
HPF Magnitude Response
(MCLK = 3.58 MHz).
The multiplier output gives the product of the two highpass-filtered channels, corresponding to instantaneous
active (real) power. Multiplying two sine wave signals
by the same ω frequency gives a DC component and a
2ω component. The instantaneous power signal
contains the active (real) power of its DC component,
while also containing 2ω components coming from the
line frequency multiplication. These 2ω components
come for the line frequency (and its harmonics) and
must be removed in order to extract the real-power
information. This is accomplished using the low-pass
filter and DTF converter.
Time
PROPER
OPERATION
RESET
Power-on Reset Operation.
© 2009 Microchip Technology Inc.
DS21948E-page 17
MCP3905/06
4.6
Low-Pass Filter and DTF
Converter
The MCP3905/06 low-pass filter is a first-order IIR filter
that extracts the active (real) power information
(DC component) from the instantaneous power signal.
The magnitude response of this filter is detailed in
Figure 4-5. Due to the fact that the instantaneous power
signal has harmonic content (coming from the 2ω
components of the inputs), and since the filter is not
ideal, there will be some ripple at the output of the
low-pass filter at the harmonics of the line frequency.
Normal Mode Rejection (dB)
The cut-off frequency of the filter (8.9 Hz) has been
chosen to have sufficient rejection for commonly-used
line frequencies (50 Hz and 60 Hz). With a standard
input clock (MCLK = 3.58 MHz) and a 50 Hz line
frequency, the rejection of the 2ω component (100 Hz)
will be more than 20 dB. This equates to a 2ω
component containing 10 times less power than the
main DC component (i.e., the average active (real)
power).
The output of the low-pass filter is accumulated in the
DTF converter. This accumulation is compared to a
different digital threshold for FOUT0/1 and HFOUT,
representing a quantity of real energy measured by the
part. Every time the digital threshold on FOUT0/1 or
HFOUT is crossed, the part will output a pulse
(See Section 4.7 “FOUT0/1 and HFOUT Output
Frequencies”).
The equivalent quantity of real energy required to
output a pulse is much larger for the FOUT0/1 outputs
than the HFOUT. This is such that the integration period
for the FOUT0/1 outputs is much larger. This larger
integration period acts as another low-pass filter so that
the output ripple due to the 2ω components is minimal.
However, these components are not totally removed,
since realized low-pass filters are never ideal. This will
create a small jitter in the output frequency. Averaging
the output pulses with a counter or a Microcontroller
Unit (MCU) in the application will then remove the small
sinusoidal content of the output frequency and filter out
the remaining 2ω ripple.
HFOUT is intended to be used for calibration purposes
due to its instantaneous power content. The shorter
integration period of HFOUT demands that the 2ω
component be given more attention. Since a sinusoidal
signal average is zero, averaging the HFOUT signal in
steady-state conditions will give the proper real energy
value.
0
-5
-10
-15
-20
-25
-30
-35
-40
0.1
1
10
100
1000
Frequency (Hz)
FIGURE 4-5:
LPF Magnitude Response
(MCLK = 3.58 MHz).
DS21948E-page 18
© 2009 Microchip Technology Inc.
MCP3905/06
4.7
FOUT0/1 and HFOUT Output
Frequencies
The thresholds for the accumulated energy are
different for FOUT0/1 and HFOUT (i.e., they have different transfer functions). The FOUT0/1 allowed output
frequencies are quite low in order to allow superior
integration time (see Section 4.6 “Low-Pass Filter
and DTF Converter”). The FOUT0/1 output frequency
can be calculated with the following equation:
EQUATION 4-1:
For a given DC input V, the DC and RMS values are
equivalent. For a given AC input signal with peak-topeak amplitude of V, the equivalent RMS value is V/
sqrt(2), assuming purely sinusoidal signals. Note that
since the active (real) power is the product of two RMS
inputs, the output frequencies of an AC signal is half
that of the DC equivalent signal, again assuming purely
sinusoidal AC signals. The constant FC depends on the
FOUT0 and FOUT1 digital settings. Table 4-3 shows
FOUT0/1 output frequencies for the different logic
settings.
FOUT FREQUENCY
OUTPUT EQUATION
8.06 × V 0 × V 1 × G × F C
F OUT ( Hz ) = ---------------------------------------------------------2
( V REF )
Where:
V0 = the RMS differential voltage on Channel 0
V1 = the RMS differential voltage on Channel 1
G = the PGA gain on Channel 0
(current channel)
FC = the frequency constant selected
VREF = the voltage reference
TABLE 4-3:
OUTPUT FREQUENCY CONSTANT FC FOR FOUT0/1 (VREF = 2.4V)
F1
F0
FC (Hz)
FC (Hz)
(MCLK = 3.58 MHz)
FOUT Frequency (Hz)
with Full-Scale
DC Inputs
FOUT Frequency (Hz)
with Full-Scale
AC Inputs
0
0
MCLK/221
1.71
0.74
0.37
0
1
MCLK/220
3.41
1.48
0.74
0
19
6.83
2.96
1.48
18
13.66
5.93
2.96
1
1
1
MCLK/2
MCLK/2
© 2009 Microchip Technology Inc.
DS21948E-page 19
MCP3905/06
The high-frequency output HFOUT has lower
integration times and, thus, higher frequencies. The
output frequency value can be calculated with the
following equation:
EQUATION 4-2:
HFOUT FREQUENCY
OUTPUT EQUATION
8.06 × V 0 × V 1 × G × HF C
HF OUT ( Hz ) = --------------------------------------------------------------2
( V REF )
Where:
V0 = the RMS differential voltage on Channel 0
V1 = the RMS differential voltage on Channel 1
G = the PGA gain on Channel 0
(current channel)
FC = the frequency constant selected
VREF = the voltage reference
The constant HFC depends on the FOUT0 and FOUT1
digital settings with the Table 4-4.
MINIMAL OUTPUT FREQUENCY FOR
NO-LOAD THRESHOLD
The MCP3905/06 also includes, on each output
frequency, a no-load threshold circuit that will eliminate
any creep effects in the meter. The outputs will not
show any pulse if the output frequency falls below the
no-load threshold. The minimum output frequency on
FOUT0/1 and HFOUT is equal to 0.0015% of the
maximum output frequency (respectively FC and HFC)
for each of the F2, F1 and F0 selections (see Table 4-3
and Table 4-4); except when F2, F1, F0 = 011. In this
last configuration, the no-load threshold feature is
disabled. The selection of FC will determine the start-up
current load. In order to respect the IEC standards
requirements, the meter will have to be designed to
allow start-up currents compatible with the standards
by choosing the FC value matching these
requirements. For additional applications information
on no-load threshold, startup current and other meter
design points, refer to AN994, "IEC Compliant Active
Energy Meter Design Using The MCP3905/6”,
(DS00994).
The detailed timings of the output pulses are described
in the Timing Characteristics table (see Section 1.0
“Electrical Characteristics” and Figure 1-1).
TABLE 4-4:
OUTPUT FREQUENCY CONSTANT HFC FOR HFOUT (VREF = 2.4V)
F2
F1
F0
HFC
HFC (Hz)
HFC (Hz)
(MCLK = 3.58 MHz)
HFOUT Frequency (Hz) with
full-scale AC Inputs
0
0
0
64 x FC
MCLK/215
109.25
27.21
0
0
1
32 x FC
MCLK/215
109.25
27.21
0
1
0
16 x FC
MCLK/215
109.25
27.21
2048 x FC
MCLK/27
27968.75
6070.12
128 x FC
MCLK/216
219.51
47.42
64 x FC
MCLK/216
219.51
47.42
32 x FC
MCLK/216
219.51
47.42
16 x FC
MCLK/216
219.51
47.42
0
1
1
1
1
1
0
0
1
1
DS21948E-page 20
1
0
1
0
1
© 2009 Microchip Technology Inc.
MCP3905/06
5.0
APPLICATIONS INFORMATION
5.1
Meter Design using the
MCP3905/06
For all applications information, refer to AN994, "IEC
Compliant Active Energy Meter Design Using The
MCP3905/6” (DS00994). This application note
includes all required energy meter design information,
including the following:
•
•
•
•
•
•
•
•
•
•
•
•
Meter rating and current sense choices
Shunt design
PGA selection
F2, F1, F0 selection
Meter calibration
Anti-aliasing filter design
Compensation for parasitic shunt inductance
EMC design
Power supply design
No-load threshold
Start-up current
Accuracy testing results from MCP3905-based
meter
• EMC testing results from MCP3905-based meter
© 2009 Microchip Technology Inc.
DS21948E-page 21
MCP3905/06
NOTES:
DS21948E-page 22
© 2009 Microchip Technology Inc.
MCP3905/06
6.0
PACKAGING INFORMATION
6.1
Package Marking Information
24-Lead SSOP
Examples:
XXXXXXXXXXXX
XXXXXXXXXXXX
YYWWNNN
Legend: XX...X
Y
YY
WW
NNN
e3
*
Note:
MCP3905L
e3
I/SS^^
0906256
Customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
© 2009 Microchip Technology Inc.
DS21948E-page 23
MCP3905/06
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© 2009 Microchip Technology Inc.
MCP3905/06
APPENDIX A:
REVISION HISTORY
Revision E (June 2009)
The following is the list of modifications:
1.
2.
Document marked “Obsolete Device”.
Updated Packaging Outline Drawings.
Revision D (February 2007)
The following is the list of modifications:
1.
updates to the packaging diagrams.
Revision C (October 2005)
The following is the list of modifications:
1.
Added references to MCP3905/06 throughout
document.
Revision B (August 2005)
The following is the list of modifications:
1.
Replace Figures 2-1 thru 2-6 in Section 2.0
“Typical Performance Curves”
Revision A (July 2005)
• Original Release of this Document.
© 2009 Microchip Technology Inc.
DS21948E-page 25
MCP3905/06
NOTES:
DS21948E-page 26
© 2009 Microchip Technology Inc.
MCP3905/06
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
X
/XX
Device
Temperature
Range
Package
Device:
MCP3905L:Energy-Metering IC
MCP3905LT:Energy-Metering IC (Tape and Reel)
MCP3906: Energy-Metering IC
MCP3906T: Energy-Metering IC (Tape and Reel)
Temperature
Range:
I
= -40°C to +85°C
Package:
SS = Plastic Shrink Small Outline (209 mil Body),
24-lead
© 2009 Microchip Technology Inc.
Examples:
a)
b)
MCP3905L-I/SS: Industrial Temperature,
24LD SSOP.
MCP3905LT-I/SS:Tape and Reel,
Industrial Temperature,
24LD SSOP.
a)
MCP3906-I/SS: Industrial Temperature,
24LD SSOP.
b)
MCP3906T-I/SS: Tape and Reel,
Industrial Temperature,
24LD SSOP.
DS21948E-page 27
MCP3905/06
NOTES:
DS21948E-page 28
© 2009 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,
rfPIC and UNI/O are registered trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MXDEV, MXLAB, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip
Technology Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, nanoWatt XLP,
Omniscient Code Generation, PICC, PICC-18, PICkit,
PICDEM, PICDEM.net, PICtail, PIC32 logo, REAL ICE, rfLAB,
Select Mode, Total Endurance, TSHARC, WiperLock and
ZENA are trademarks of Microchip Technology Incorporated
in the U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2009, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
© 2009 Microchip Technology Inc.
DS21948E-page 29
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
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EUROPE
Corporate Office
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Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://support.microchip.com
Web Address:
www.microchip.com
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Tel: 91-11-4160-8631
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Tel: 43-7242-2244-39
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Thailand - Bangkok
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Fax: 66-2-694-1350
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
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Tel: 86-756-3210040
Fax: 86-756-3210049
03/26/09
DS21948E-page 30
© 2009 Microchip Technology Inc.