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CS5464-IS

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P46
CS5464
4 DS682F3
9.1.4 Temperature Sensor Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9.1.4.1 Temperature Offset Calibration . . . . . . . . . . . . . . . . . . . . . . . 40
9.1.4.2 Temperature Gain Calibration . . . . . . . . . . . . . . . . . . . . . . . . 40
10. E2PROM Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
10.1 E
2
PROM Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
10.2 E
2
PROM Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
10.3 Which E
2
PROMs Can Be Used? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
11. Basic Application Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
12. Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
13. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
14. Environmental, Manufacturing, & Handling Information . . . . . . . . . . . . . . . . . 44
15. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
LIST OF FIGURES
Figure 1. CS5464 Read and Write Timing Diagrams ................................................................. 12
Figure 2. Timing Diagram for
E1, E2, and E3.............................................................................. 13
Figure 3. Signal Flow for V1, I1, P1, Q1 Measurements ............................................................ 14
Figure 4. Signal Flow for V2, I2, P2, Q2 Measurements ............................................................ 14
Figure 5. Low-rate Calculations.................................................................................................. 16
Figure 6. Oscillator Connections................................................................................................. 17
Figure 7. Sag and Fault Detect................................................................................................... 21
Figure 8. Energy Channel Selection........................................................................................... 22
Figure 9. Fixed RMS Voltage Selection...................................................................................... 22
Figure 10. Calibration Data Flow ................................................................................................39
Figure 11. System Calibration of Offset...................................................................................... 39
Figure 12. System Calibration of Gain........................................................................................ 40
Figure 13. Typical Interface of E
2
PROM to CS5464 .................................................................. 41
Figure 14. Typical Connection Diagram .................................................................................... 42
LIST OF TABLES
Table 1. Interrupt Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 2. Current Input Gain Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 3. High-pass Filter Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 4. E2
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 5. E3
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 6. E1
/ E2 Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 7. E3
Pin with E1MODE enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
CS5464
DS682F3 5
1. OVERVIEW
The CS5464 is a CMOS power measurement integrated circuit utilizing four  analog-to-digital convert-
ers to measure line voltage, temperature, and current from up to two sources. It calculates active, reactive,
and apparent power as well as RMS and peak voltage and current. It handles other system-related func-
tions, such as pulse output conversion, voltage sag, current fault, voltage zero crossing, line frequency,
and tamper detection.
The CS5464 is optimized to interface to current transformers or shunt resistors for current measurement,
and to a resistive divider or voltage transformer for voltage measurement. Two full-scale ranges are pro-
vided on the current inputs to accommodate both types of current sensors. The second current channel
can be used for tamper detection or as a second current input. The CS5464’s three differential inputs have
a common-mode input range from analog ground (AGND) to the positive analog supply (VA+).
An additional analog input (PFMON) is provided to allow the application to determine when a power failure
is in progress. By monitoring the unregulated power supply, the application can take any required action
when a power loss occurs.
An on-chip voltage reference (nominally 2.5 volts) is generated and provided at analog output, VREFOUT.
This reference can be supplied to the chip by connecting it to the reference voltage input, VREFIN. Alter-
natively, an external voltage reference can be supplied to the reference input.
Three digital outputs (E1
, E2, E3) provide a variety of output signals and, depending on the mode select-
ed, provide energy pulses, power failure indication, or other choices.
The CS5464 includes a three-wire serial host interface to an external microcontroller or serial E
2
PROM.
Signals include serial data input (SDI), serial data output (SDO), serial clock (SCLK), and optionally, a
chip select (CS
), which allows the CS5464 to share the SDO signal with other devices. A MODE input is
used to control whether an E
2
PROM will be used instead of a host microcontroller.
CS5464
6 DS682F3
2. PIN DESCRIPTION
Clock Generator
Crystal Out
Crystal In
1,28
XOUT, XIN — Connect to an external quartz crystal. Alternatively, an external clock can be sup-
plied to the XIN pin to provide the system clock for the device.
CPU Clock Output 2
CPUCLK - Logic-level output from crystal oscillator. Can be used to clock an external CPU.
Control Pins and Serial Data I/O
Serial Clock 5
SCLK — Clocks serial data from the SDI pin and to the SDO pin when CS is low. SCLK is a
Schmitt-trigger input when MODE is low and a driven output when MODE is high.
Serial Data Output 6
SDO — Serial data output. Data is clocked out by SCLK.
Chip Select 7
CS — An input that enables the serial interface when MODE is low and a driven output when
MODE is high.
Mode Select 8
MODE — High selects external E
2
PROM, Low selects external microcontroller. MODE includes a
weak internal pull-down and therefore selects microcontroller mode if not connected.
Energy Outputs 22, 25,
26
E3, E1, E2 — Primarily active-low energy pulse outputs. These can be programmed to output
other conditions.
Reset 23
RESET — An active-low Schmitt-trigger input used to reset the chip.
Interrupt 24
INT — Active-low output, indicates that an enabled condition has occurred.
Serial Data Input 27
SDI — Serial data input. Data is clocked in by SCLK.
Analog Inputs/Outputs
Differential Voltage Inputs 9,10
VIN+, VIN- — Differential analog inputs for the voltage channel.
Differential Current Inputs 20,19,
16,15
IIN1+, IIN1-, IIN2+, IIN2- — Differential analog inputs for the current channels.
Power Fail Monitor 21
PFMON — Used to monitor the unregulated power supply via a resistive divider. If the PFMON
voltage drops below its low limit, the low-supply detect (LSD) bit is set in the Status register.
Voltage Reference Output 11
VREFOUT — The on-chip voltage reference output. Nominally 2.5 V, referenced to AGND.
Voltage Reference Input 12
VREFIN — The voltage reference input. Can be connected to VREFOUT or external 2.5 V refer-
ence.
Power Connections
Positive Digital Supply 3
VD+ — The positive digital supply.
Digital Ground 4
DGND — Digital ground.
Positive Analog Supply 18
VA+ — The positive analog supply.
Analog Ground 17
AGND — Analog ground.
Other Pins
Test1, Test2 13,14
NC — Factory use only. Connect to AGND.
VREFIN 12Voltage Reference Input
VREFOUT 11Voltage Reference Output
VIN- 10Differential Voltage Input
VIN+ 9Differential Voltage Input
MODE 8Mode Select
CS 7Chip Select
SDO 6Serial Data Ouput
SCLK 5Serial Clock
DGND 4Digital Ground
VD+ 3Positive Digital Supply
CPUCLK 2CPU Clock Output
XOUT 1Crystal Out
AGND17 Analog Ground
VA+
18 Positive Analog Supply
IIN1-19 Differential Current Input
IIN1+20 Differential Current Input
PFMON21 Power Fail Monitor
E322 Energy Output 3
RESET23 Reset
INT24 Interrupt
E125 Energy Output 1
26
SDI27 Serial Data Input
XIN28 Crystal In
E2
Energy Output 2
TEST2 14Factory Test
TEST1 13Factory Test
IIN2-15 Differential Current Input
IIN2+16 Differential Current Input
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P46

CS5464-IS

Mfr. #:
Buy CS5464-IS
Manufacturer:
Cirrus Logic
Description:
Current & Power Monitors & Regulators 3-Ch Single Phase Power/Energy IC
Lifecycle:
New from this manufacturer.
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