Cirrus Logic CS5490 - Manual (Page 55)

CS5490
DS982F3 55
8. BASIC APPLICATION CIRCUITS
The CS5490 is configured to measure power in a
single-phase, two-wire single voltage and current
system, as illustrated in
Figure 21 . In this diagram, a
current transformer (CT) is used to sense the line load
current, and a resistive voltage divider is used to sense
the line voltage.
CT
CS5490
Line N
VIN-
VIN+
IIN+
IIN-
Application
Processor
RESET
RX
TX
GNDA
DO
VDDA
+3.3V
0.1µF 0.1µF
+3.3V
VDDD
+3.3V
VREF-
VREF+
0.1µF
Wh
4.096 MHz
XIN
XOUT
1K
MODE
5 x250K 1K
LOA D
0.1 µF
10K
+3.3V
27nF
27nF
1K
1K
½ R BURDEN
½ R BURDEN
27nF
27nF
Figure 21. Typical Connection Diagram (Single-phase, Two-wire, Power Meter)