INA3221 Monitor Datasheet

INA3221 Datasheet, PDF, Equivalent


Part Number

INA3221

Description

Shunt and Bus Voltage Monitor

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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INA3221
SBOS576B – MAY 2012 – REVISED MARCH 2016
INA3221 Triple-Channel, High-Side Measurement,
Shunt and Bus Voltage Monitor with I2C- and SMBUS-Compatible Interface
1 Features
1 Senses Bus Voltages From 0 V to 26 V
• Reports Shunt and Bus Voltage
• High Accuracy:
– Offset Voltage: ±80 µV (max)
– Gain Error: 0.25% (max)
• Configurable Averaging Options
• Four Programmable Addresses
• Programmable Alert and Warning Outputs
• Power-Supply Operation: 2.7 V to 5.5 V
2 Applications
• Computers
• Power Management
• Telecom Equipment
• Battery Chargers
• Power Supplies
• Test Equipment
3 Description
The INA3221 is a three-channel, high-side current
and bus voltage monitor with an I2C- and SMBUS-
compatible interface. The INA3221 monitors both
shunt voltage drops and bus supply voltages, in
addition to having programmable conversion times
and averaging modes for these signals. The INA3221
offers both critical and warning alerts to detect
multiple programmable out-of-range conditions for
each channel.
The INA3221 senses current on buses that can vary
from 0 V to 26 V. The device is powered from a
single 2.7-V to 5.5-V supply, and draws 350 μA (typ)
of supply current. The INA3221 is specified over the
operating temperature range of –40°C to +125°C.
The I2C- and SMBUS-compatible interface features
four programmable addresses.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
INA3221
VQFN (16)
4.00 mm x 4.00 mm
(1) For all available packages, see the package option addendum
at the end of the datasheet.
Power Supply
(0 V to 26 V)
Typical Application
Load 1
CBYPASS
0.1 µF
Power Supply
(0 V to 26 V)
VIN+2
VIN±2
VIN+1
CH 2
Load 2
Power Supply
(0 V to 26 V)
VIN+3
VIN±1
CH 1
ADC
CH 3
Bus
Voltages 1-3
Shunt
Voltages 1-3
Critical Limit
Alerts 1-3
Shunt Voltage
Sum Alerts
VIN±3
GND
VS (Supply
Voltage)
I2C-
and
SMBus-
Compatible
Interface
SDA
SCL
A0
VPU
VPU
Power Valid (PV)
Critical
Warning
Timing Control (TC)
Load 3
10 k
VS
10 k
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

INA3221
INA3221
SBOS576B – MAY 2012 – REVISED MARCH 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 4
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 6
7.6 Typical Characteristics .............................................. 7
8 Detailed Description ............................................ 10
8.1 Overview ................................................................. 10
8.2 Functional Block Diagram ....................................... 10
8.3 Feature Description................................................. 11
8.4 Device Functional Modes........................................ 16
8.5 Programming .......................................................... 20
8.6 Register Maps ......................................................... 24
9 Application and Implementation ........................ 36
9.1 Application Information............................................ 36
9.2 Typical Application ................................................. 36
10 Power Supply Recommendations ..................... 38
11 Layout................................................................... 38
11.1 Layout Guidelines ................................................. 38
11.2 Layout Example .................................................... 38
12 Device and Documentation Support ................. 39
12.1 Device Support...................................................... 39
12.2 Documentation Support ....................................... 39
12.3 Community Resources.......................................... 39
12.4 Trademarks ........................................................... 39
12.5 Electrostatic Discharge Caution ............................ 39
12.6 Glossary ................................................................ 39
13 Mechanical, Packaging, and Orderable
Information ........................................................... 39
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (June 2013) to Revision B
Page
• Added Device Informationand ESD Ratings tables, and Feature Description, Device Functional Modes, Application
and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and
Mechanical, Packaging, and Orderable Information sections ................................................................................................ 1
• Deleted trace from SDA to SCL, and added missing connector dot to VS in front-page diagram ........................................ 1
• Added (VIN+) + (VIN–) / 2 to common-mode analog inputs in the Absolute Maximum Ratings table ..................................... 5
• Deleted VBUS from analog inputs in Absolute Maximum Ratings table ............................................................................... 5
• Added operating temperature to Absolute Maximum Ratings table ....................................................................................... 5
• Changed all VSENSE to VSHUNT throughout data sheet for consistency.................................................................................... 6
• Changed "Status register" to "Mask/Enable register" to clarify register name in Basic ADC Functions section ................. 11
• Changed Critical Alert section text for clarity. ...................................................................................................................... 12
• Added Summation Control Function section ........................................................................................................................ 12
• Changed external "RPU" to "RPU_ext" in Figure 20 ................................................................................................................. 14
• Changed Multiple Channel Monitoring section text for clarity. ............................................................................................ 17
• Added X and Y axis labels to Figure 25 ............................................................................................................................... 18
• Changed "bidirectional" to "I/O" in second paragraph of Bus Overview section .................................................................. 20
• Changed VS+ to VS in Table 1.............................................................................................................................................. 20
• Changed references in Figure 30 to point to correct notes .................................................................................................. 22
• Changed Figure 31 ............................................................................................................................................................... 23
• Changed values in Table 2, Bus Timing Definitions............................................................................................................. 23
• Added data valid time to Table 2, Bus Timing Definitions.................................................................................................... 23
• Changed fall time to split data and clock times in Table 2, Bus Timing Definitions ............................................................. 23
• Deleted rise time for data in Table 2, Bus Timing Definitions .............................................................................................. 23
• Deleted trace from SDA to SCL, and added missing connector dot to VS in Figure 52 ...................................................... 36
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Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community INA3221 SBOS576B – MAY 201 2 – REVISED MARCH 2016 INA3221 Triple -Channel, High-Side Measurement, Shunt and Bus Voltage Monitor with I2C- and S MBUS-Compatible Interface 1 Features 1 Senses Bus Voltages From 0 V to 26 V • Reports Shunt and Bus Voltage • High Accuracy: – Offset Voltage: ±8 0 µV (max) – Gain Error: 0.25% (max) • Configurable Averaging Options • Four Programmable Addresses • Progra mmable Alert and Warning Outputs • Po wer-Supply Operation: 2.7 V to 5.5 V 2 Applications • Computers • Power Ma nagement • Telecom Equipment • Batt ery Chargers • Power Supplies • Tes t Equipment 3 Description The INA3221 is a three-channel, high-side current a nd bus voltage monitor with an I2C- and SMBUScompatible interface. The INA3221 monitors both shunt voltage drops and bus supply voltages, in addition to hav ing programmable conversion times and averaging modes for these signals. The INA3221 offers both cr.
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