Cirrus Logic CS5484 - Manual (Page 65)

CS5484
DS981F3 65
8. BASIC APPLICATION CIRCUITS
Figure 25 shows the CS5484 configured to measure
power in a single-phase, 3-wire system with two
voltages and two currents. In this diagram, current
transformers (CTs) are used to sense the line load
currents, and resistive voltage dividers are used to
sense the line voltage.
CT
CT
5 x 250K 1K
CS5484
27nF
27nF
1K
1K
L1 L2 N
VIN2-
VIN2+
IIN1+
IIN1-
IIN2+
IIN2-
Application
Processor
RESET
RX
TX
GNDA GNDD
DO3
DO1
DO2
VDDA
+3.3V
0.1uF 0.1uF
+3.3V
VDDD
+3.3V
VREF-
VREF+
0.1uF
27nF
27nF
1K
1K
½ R BURDEN
Wh Varh
4.096MHz
XIN
XOUT
27nF
27nF
1K
SSEL
Interrupt
½ R BURDEN
½ R BURDEN
½ R BURDEN
MODE
VIN1+
VIN1-
27nF
27nF
1K
5 x 250K 1K Zero Crossings
DO4
+3.3V
LOA D LOA D
0.1 uF
10K
+3.3V
CS
Figure 25. Typical Connection (Single-phase, 3-wire, 12S Electricity Meter)