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CS5460 Fiches technique(PDF) 9 Page - Cirrus Logic

No de pièce CS5460
Description  Single Phase Bi-Directional Power/Energy IC
Download  34 Pages
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Fabricant  CIRRUS [Cirrus Logic]
Site Internet  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS5460 Fiches technique(HTML) 9 Page - Cirrus Logic

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CS5460
DS279PP5
9
2. GENERAL DESCRIPTION
The CS5460 is a CMOS monolithic power mea-
surement device with an energy computation en-
gine. The CS5460 combines a programmable gain
amplifier, two
∆Σ modulators, two high rate filters,
system calibration, and power calculation func-
tions to compute Energy, VRMS, IRMS, and Instan-
taneous Power.
The CS5460 is designed for power meter applica-
tions and is optimized to interface to shunts or cur-
rent transformers to measure current, and a
resistive divider or transformer to measure voltage.
To accommodate various input voltage levels due
to shunts, the current channel includes a program-
mable gain amplifier (PGA) which allows the user
to measure either 150mVRMS or 30mVRMS signals.
The CS5460 includes two high-rate digital filters
which output data at a (MCLK/K)/1024 output word
rate (OWR). A high-pass filter in both channels can
be enabled to remove the DC content from the input
signal before the energy calculations are made.
To ease communication between the CS5460 and a
micro-controller, the converter includes a simple
three-wire serial interface which is SPI™ and Mi-
crowire™ compatible. The serial port also contains
a Schmitt Trigger input on its serial clock (SCLK)
to allow for slow rise time signals.
2.1 Theory of Operation
The CS5460 is designed to operate from a single
+5 V supply or dual ±2.5 V supplies, to provide a
30mVRMS or 150mVRMS range for the current
channel and to provide a 150mVRMS range for the
voltage channel. With single supply, the CS5460 is
designed to accommodate common mode signals
of -0.25V to VA+.
Figure 3 illustrates the CS5460 connected to a ser-
vice to measure power in a single-phase 2-wire sys-
tem
while
operating
in
a
single
supply
configuration. Figure 4 illustrates the CS5460 con-
figured to measure power in a single-phase 3-wire
system.
VA+
VD+
CS5460
0.1 µF
100 µF
500 Ω
470 nF
500 Ω
N
R1
R2
10 Ω
14
VIN+
9
VIN-
IIN-
10
15
16
IIN+
PFMON
CPUCLK
XOUT
XIN
Optional
Clock
Source
Serial
Data
Interface
RESET
17
2
1
24
19
CS
7
SDI
23
SDO
6
SCLK
5
INT
20
EDIR
22
EOUT
21
0.1 µF
VREFIN
12
VREFOUT
11
VA-
DGND
13
4
3
To Service
2.5 MHz to
20 MHz
0.1 µF
CP
10 kΩ
5kΩ
L
RS
V
CP
I
RP
I
*
*
*
* Refer to Input Current Protection
Figure 3. Typical Connection Diagram (One-Phase 2-Wire)


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