Cirrus-logic CS5490 Uživatelský manuál stáhnout pdf (Strana 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.

CS5490

LineN

VIN-

VIN+

IIN+

IIN-

Application

Processor

RESET

GNDA

VDDA

+3.3V

0.1µF 0.1µF

+3.3V

VDDD

+3.3V

VREF-

VREF+

0.1µF

4.096 MHz

XIN

XOUT

MODE

5 x250K

LOAD

0.1 µF

10K

+3 .3V

27nF

½ R

BURDEN

½ R

BURDEN

27nF

Figure 21. Typical Connection Diagram (Single-phase, Two-wire, Power Meter)

1 2 ... 50 51 52 53 54 55 56 57

Features 1
Description 1
TABLE OF CONTENTS 2
DS982F3 3 3
LIST OF FIGURES 4
LIST OF TABLES 4
1. OVERVIEW 5
2. PIN DESCRIPTION 6
2.2 Digital Pins 7
TYPICAL LOAD PERFORMANCE 8
DS982F3 9 9
Figure 5. I 9
Load Performance 9
ANALOG CHARACTERISTICS 10
VOLTAGE REFERENCE 11
DIGITAL CHARACTERISTICS 12
SWITCHING CHARACTERISTICS 13
ABSOLUTE MAXIMUM RATINGS 14
4. SIGNAL FLOW DESCRIPTION 15
4.8 Low-rate Calculations 16
4.7 Digital Integrators 16
5.1 Power-on Reset (POR) 18
5.2 Power Saving Modes 18
5.3 Zero-crossing Detection 18
5.5 Energy Pulse Generation 19
5.5.1 Pulse Rate 20
Duration 21
5.7 Phase Sequence Detection 22
5.8 Temperature Measurement 23
5.9 Anti-creep 23
5.10 Register Protection 23
6.1 Host Commands 24
6.1.3 Checksum 25
6.1.4 Serial Time Out 25
Y Y 0x 00 0000 28
0x 00 0000 28
Y Y 0x D5 3998 29
6.6 Register Descriptions 32
) – Page 18, Address 47 45
7. SYSTEM CALIBRATION 52
7.2 Phase Compensation 53
°C and 85°C. Obtain a linear 54
8. BASIC APPLICATION CIRCUITS 55
9. PACKAGE DIMENSIONS 56
10. ORDERING INFORMATION 57
12. REVISION HISTORY 57

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