CS5460A. 5460A Datasheet

5460A CS5460A. Datasheet pdf. Equivalent

Part 5460A
Description CS5460A
Feature CS5460A Single Phase Bi-Directional Power/Energy IC Features Energy Data Linearity: ±0.1% of Readin.
Manufacture Cirrus Logic
Datasheet
Download 5460A Datasheet



5460A
CS5460A
Single Phase Bi-Directional Power/Energy IC
Features
Description
Energy Data Linearity: ±0.1% of Reading
over 1000:1 Dynamic Range.
On-Chip Functions: (Real) Energy, I V,
IRMS and VRMS, Energy-to-Pulse
Conversion
www.DataSheet4US.cmomart “Auto-Boot” Mode from Serial
EEPROM Enables Use without MCU.
AC or DC System Calibration
Mechanical Counter/Stepper Motor Driver
Meets Accuracy Spec for IEC 687/1036, JIS
Typical Power Consumption <12 mW
Interface Optimized for Shunt Sensor
V vs. I Phase Compensation
Ground-Referenced Signals with Single
Supply
On-chip 2.5 V Reference (MAX 60 ppm/°C
drift)
Simple Three-Wire Digital Serial Interface
Watch Dog Timer
Power Supply Monitor
Power Supply Configurations
VA+ = +5 V; VA- = 0 V; VD+ = +3.3 V to +5 V
The CS5460A is a highly integrated power mea-
surement solution which combines two ∆Σ
Analog-to-Digital Converters (ADCs), high speed
power calculation functions, and a serial interface
on a single chip. It is designed to accurately mea-
sure and calculate: Real (True) Energy,
Instantaneous Power, IRMS, and VRMS for single
phase 2- or 3-wire power metering applications.
The CS5460A interfaces to a low-cost shunt resis-
tor or transformer to measure current, and to a
resistive divider or potential transformer to mea-
sure voltage. The CS5460A features a
bi-directional serial interface for communication
with a micro-controller and a pulse output engine
for which the average pulse frequency is propor-
tional to the real power. The CS5460A has on-chip
functionality to facilitate AC or DC system-level
calibration.
The “Auto-Boot” feature allows the CS5460A to
function ‘stand-alone’ and to initialize itself on sys-
tem power-up. In Auto-Boot Mode, the CS5460A
reads the calibration data and start-up instructions
from an external EEPROM. In this mode, the
CS5460A can operate without a microcontroller, in
order to lower the total bill-of-materials cost.
VA+
IIN+ PGA
IIN- x10,x50
4th Order
∆Σ
Modulator
VIN+
x10
VIN-
VREFIN
x1
2nd Order
∆Σ
Modulator
VREFOUT
Voltage
Reference
Power
Monitor
RESET
VD+
Digital
Filter
Digital
Filter
System
Clock
/K
High Pass
Filter
Power
Calculation
Engine
(Energy
I*V
IRMS,VRMS )
High Pass
Filter
Clock
Generator
Watch Dog
Timer
Control /
Serial
Interface
Energy-to-
Pulse
Converter
Calibration
SRAM
MODE
CS
SDI
SDO
SCLK
INT
EDIR
EOUT
Cirrus Logic, Inc.
http://www.cirrus.com
VA- PFMON
XIN XOUT CPUCLK
DGND
©Copyright Cirrus Logic, Inc. 2004
(All Rights Reserved)
SEP ‘04
DS487F2
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5460A
CS5460A
TABLE OF CONTENTS
1. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 5
ANALOG CHARACTERISTICS ................................................................................................ 5
VREFOUT REFERENCE OUTPUT VOLTAGE........................................................................ 7
5V DIGITAL CHARACTERISTICS............................................................................................ 7
3.3 V DIGITAL CHARACTERISTICS........................................................................................ 8
ABSOLUTE MAXIMUM RATINGS ........................................................................................... 8
SWITCHING CHARACTERISTICS .......................................................................................... 9
2. GENERAL DESCRIPTION ..................................................................................................... 12
2.1 Theory of Operation ......................................................................................................... 12
2.1.1 DS Modulators ................................................................................................... 12
www.DataSheet4U.com
2.1.2 High-Rate Digital Low-Pass Filters ..................................................................... 12
2.1.3 Digital Compensation Filters ............................................................................... 12
2.1.4 Digital High-Pass Filters ...................................................................................... 12
2.1.5 Overall Filter Response ....................................................................................... 13
2.1.6 Gain and DC Offset Adjustment .......................................................................... 13
2.1.7 Real Energy and RMS Computations ................................................................. 13
2.2 Performing Measurements ............................................................................................... 13
2.2.1 CS5460A Linearity Performance ......................................................................... 15
2.2.2 Single Computation Cycle (C=0) ......................................................................... 15
2.2.3 Continuous Computation Cycles (C=1) ............................................................... 16
2.3 Basic Application Circuit Configurations .......................................................................... 16
3. FUNCTIONAL DESCRIPTION ............................................................................................... 21
3.1 Pulse-Rate Output ........................................................................................................... 21
3.2 Pulse Output for Normal Format, Stepper Motor Format and Mechanical Counter Format 22
3.2.1 Normal Format .................................................................................................... 22
3.2.2 Mechanical Counter Format ................................................................................ 23
3.2.3 Stepper Motor Format ......................................................................................... 23
3.3 Auto-Boot Mode Using EEPROM .................................................................................... 24
3.3.1 Auto-Boot Configuration ...................................................................................... 24
3.3.2 Auto-Boot Data for EEPROM .............................................................................. 25
3.3.3 Application Note AN225 ...................................................................................... 26
3.4 Interrupt and Watchdog Timer ......................................................................................... 26
3.4.1 Interrupt ............................................................................................................... 26
3.4.1.1 Clearing the Status Register ............................................................... 26
3.4.1.2 Typical use of the INT pin ................................................................... 26
3.4.1.3 INT Active State .................................................................................. 26
3.4.1.4 Exceptions ........................................................................................... 26
3.4.2 Watch Dog Timer ................................................................................................ 26
3.5 Oscillator Characteristics ................................................................................................. 27
3.6 Analog Inputs ................................................................................................................... 27
3.7 Voltage Reference ........................................................................................................... 27
3.8 Calibration ........................................................................................................................ 27
3.8.1 Overview of Calibration Process ......................................................................... 27
3.8.2 The Calibration Registers .................................................................................... 28
3.8.3 Calibration Sequence .......................................................................................... 28
3.8.4 Calibration Signal Input Level ............................................................................. 29
3.8.5 Calibration Signal Frequency .............................................................................. 29
3.8.6 Input Configurations for Calibrations ................................................................... 29
3.8.7 Description of Calibration Algorithms .................................................................. 30
3.8.7.1 AC Offset Calibration Sequence ......................................................... 30
3.8.7.2 DC Offset Calibration Sequence ......................................................... 31
3.8.7.3 AC Gain Calibration Sequence ........................................................... 31
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