CDB5461AU Cirrus Logic Inc, CDB5461AU Datasheet - Page 39

• Manufacturer Part Number: CDB5461AU
• Description: Eval Bd Sngl Phase Power/Energy
• Manufacturer: Cirrus Logic Inc

Specifications of CDB5461AU

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: CS5461A
• Primary Attributes: 1-Phase, Energy-to-Frequency Output
• Secondary Attributes: GUI, USB, SPI, Microwire Interfaces
• Processor To Be Evaluated: CS5461A, C8051F320
• Interface Type: USB
• Operating Supply Voltage: 5 V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant, Contains lead / RoHS non-compliant
• Other names: 598-1552

9. BASIC APPLICATION CIRCUITS
Figure 15 shows the CS5461A configured to measure
power in a single-phase, 2-wire system while operating
in a single-supply configuration. In this diagram, a shunt
resistor is used to sense the line current and a voltage
divider is used to sense the line voltage. In this type of
shunt resistor configuration, the common-mode level of
the CS5461A must be referenced to the line side of the
power line. This means that the common-mode poten-
tial of the CS5461A will track the high-voltage levels, as
well as low-voltage levels, with respect to earth ground
potential. Isolation circuitry is required when an earth-
ground-referenced communication interface is connect-
ed.
DS661F2
Figure 15. Typical Connection Diagram (Single-phase, 2-wire – Direct Connect to Power Line)
N
R
2
120 VAC
R
1
L
470 nF
R
Note:
Shunt
Indicates common (floating) return.
500 Ω
R
R
I-
I+
R
V-
470 µF
C
C
500
I+
I-
C
C
V+
V-
Figure 16
tem with complete isolation from the power lines. This
isolation is achieved using three transformers: a general
purpose transformer to supply the on-board DC power;
a high-precision, low-impedance voltage transformer
with very little roll-off/phase-delay, to measure voltage;
and a current transformer to sense the line current.
Figure 17
many 3-wire residential power systems within the Unit-
ed States, only the two line terminals are available (neu-
tral is not available).
configured to meter a three-wire system with no neutral
available.
0.1 µF
C
C
Idiff
Vdiff
0.1 µF
10
15
16
12
11
9
VIN+
VIN-
IIN-
IIN+
VREFIN
VREFOUT
VA+
shows the same single-phase, two-wire sys-
shows a single-phase, 3-wire system. In
AGND
14
13
CS5461A
10 Ω
DGND
CPUCLK
PFMON
RESET
XOUT
SCLK
4
VD+
SDO
XIN
SDI
INT
CS
E2
E1
3
5 kΩ
Figure 18
22
21
17
2
1
24
19
7
23
6
5
20
0.1 µF
Mech. Counter
Stepper Motor
4.096 MHz
or
Optional
Source
10 k Ω
Clock
shows the CS5461A
Interface
Serial
Data
CS5461A
39