MCP3905T-I/SS Microchip Technology, MCP3905T-I/SS Datasheet - Page 15

• Manufacturer Part Number: MCP3905T-I/SS
• Description: IC ENERGY METER 24-SSOP
• Manufacturer: Microchip Technology

Specifications of MCP3905T-I/SS

• Input Impedance: 390 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 2.4V
• Voltage - I/o Low: 0.85V
• Current - Supply: 2.7mA
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SSOP (0.200", 5.30mm Width)
• Meter Type: Single Phase
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.7
The thresholds for the accumulated energy are differ-
ent for F
transfer functions). The F
frequencies are quite low in order to allow superior
integration time (see Section 4.6 “Low-Pass Filter
and DTF Converter”). The F
can be calculated with the following equation:
EQUATION 4-1:
TABLE 4-3:
© 2007 Microchip Technology Inc.
Where:
V
REF
F1
F
V
V
0
0
1
1
G =
C
0
1
=
=
=
=
F
Frequencies
F
OUT0/1
OUT
OUT0/1
the RMS differential voltage on Channel 0
the RMS differential voltage on Channel 1
the PGA gain on Channel 0
(current channel)
the frequency constant selected
the voltage reference
(
F0
Hz
0
1
0
1
and HF
OUTPUT FREQUENCY CONSTANT FC FOR FOUT0/1 (V
)
and HF
=
8.06 V
---------------------------------------------------------- -
F
OUTPUT EQUATION
OUT
OUT
MCLK/2
MCLK/2
MCLK/2
MCLK/2
F
×
C
OUT
FREQUENCY
(i.e., they have different
OUT0/1
(
OUT0/1
(Hz)
0
V
×
REF
V
21
20
19
18
Output
1
)
×
2
output frequency
allowed output
G F
×
(MCLK = 3.58 MHz)
C
F
13.66
C
1.71
3.41
6.83
(Hz)
For a given DC input V, the DC and RMS values are
equivalent. For a given AC input signal with peak-to-
peak 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 F
F
F
tings.
OUT0
OUT0/1
F
OUT
with Full-Scale
and F
output frequencies for the different logic set-
Frequency (Hz)
DC Inputs
0.74
1.48
2.96
5.93
OUT1
digital settings. Table 4-3 shows
REF
MCP3905/06
= 2.4V)
F
OUT
with Full-Scale
Frequency (Hz)
AC Inputs
DS21948D-page 15
C
depends on the
0.37
0.74
1.48
2.96