Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

INA3221-Q1 Datasheet(PDF) 10 Page - Texas Instruments

Click here to check the latest version.
Part # INA3221-Q1
Description  Current and Voltage Monitor with Programmable Overcurrent Alerts
Download  45 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

INA3221-Q1 Datasheet(HTML) 10 Page - Texas Instruments

Back Button INA3221-Q1 Datasheet HTML 6Page - Texas Instruments INA3221-Q1 Datasheet HTML 7Page - Texas Instruments INA3221-Q1 Datasheet HTML 8Page - Texas Instruments INA3221-Q1 Datasheet HTML 9Page - Texas Instruments INA3221-Q1 Datasheet HTML 10Page - Texas Instruments INA3221-Q1 Datasheet HTML 11Page - Texas Instruments INA3221-Q1 Datasheet HTML 12Page - Texas Instruments INA3221-Q1 Datasheet HTML 13Page - Texas Instruments INA3221-Q1 Datasheet HTML 14Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 45 page
background image
10
INA3221-Q1
SBOS776B – MARCH 2016 – REVISED MARCH 2016
www.ti.com
Product Folder Links: INA3221-Q1
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
8.3 Feature Description
8.3.1 Basic ADC Functions
The INA3221-Q1 performs two measurements on up to three power supplies of interest. The voltage developed
from the load current passing through a shunt resistor creates a shunt voltage that is measured between the IN+
and IN– pins. The device also internally measures the power-supply bus voltage at the IN– pin for each channel.
The differential shunt voltage is measured with respect to the IN– pin, and the bus voltage is measured with
respect to ground.
The INA3221-Q1 is typically powered by a separate power supply that ranges from 2.7 V to 5.5 V. The monitored
supply buses range from 0 V to 26 V.
CAUTION
Based on the fixed 8-mV bus-voltage register LSB (for any channel), a full-scale
register value results in 32.76 V. However, the actual voltage applied to the INA3221-
Q1 input pins must not exceed 26 V.
There are no special power-supply sequencing considerations between the common-mode input ranges and the
device power-supply voltage because they are independent of each other; therefore, the bus voltages can be
present with the supply voltage off and vice versa.
The INA3221-Q1 takes two measurements for each channel: one for shunt voltage and one for bus voltage.
Each measurement can be independently or sequentially measured, based on the mode setting (bits 2-0 in the
Configuration register). When the INA3221-Q1 is in normal operating mode (that is, the MODE bits of the
Configuration register are set to 111), the device continuously converts a shunt-voltage reading followed by a
bus-voltage reading. This procedure converts one channel, and then continues to the shunt voltage reading of
the next enabled channel, followed by the bus-voltage reading for that channel, and so on, until all enabled
channels have been measured. The programmed Configuration register mode setting applies to all channels.
Any channels that are not enabled are bypassed in the measurement sequence, regardless of mode setting.
The INA3221-Q1 has two operating modes, continuous and single-shot, that determine the internal ADC
operation after these conversions complete. When the INA3221-Q1 is set to continuous mode (using the MODE
bit settings), the device continues to cycle through all enabled channels until a new configuration setting is
programmed.
The Configuration register MODE control bits also enable modes to be selected that convert only the shunt or
bus voltage. This feature further allows the device to fit specific application requirements.
In single-shot (triggered) mode, setting any single-shot convert mode to the Configuration register (that is, the
Configuration register MODE bits set to 001, 010, or 011) triggers a single-shot conversion. This action produces
a single set of measurements for all enabled channels. To trigger another single-shot conversion, write to the
Configuration register a second time, even if the mode does not change. When a single-shot conversion is
initiated, all enabled channels are measured one time and then the device enters a power-down state. The
INA3221-Q1 registers can be read at any time, even while in power-down. The data present in these registers
are from the last completed conversion results for the corresponding register. The conversion ready flag bit
(Mask/Enable register, CVRF bit) helps coordinate single-shot conversions, and is especially helpful during
longer conversion time settings. The CVRF bit is set after all conversions are complete. The CVRF bit clears
under the following conditions:
1. Writing to the Configuration register, except when configuring the MODE bits for power-down mode; or
2. Reading the Mask/Enable register.
In addition to the two operating modes (continuous and single-shot), the INA3221-Q1 also has a separate
selectable power-down mode that reduces the quiescent current and turns off current into the INA3221-Q1
inputs. Power-down mode reduces the impact of supply drain when the device is not used. Full recovery from
power-down mode requires 40 µs. The INA3221-Q1 registers can be written to and read from while the device is
in power-down mode. The device remains in power-down mode until one of the active MODE settings are written
to the Configuration register.


Similar Part No. - INA3221-Q1

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
INA3221-Q1 TI1-INA3221-Q1 Datasheet
1Mb / 46P
[Old version datasheet]   Triple-Channel, High-Side Measurement, Shunt and Bus Voltage Monitor with I2C- and SMBUS-Compatible Interface
More results

Similar Description - INA3221-Q1

ManufacturerPart #DatasheetDescription
logo
Maxim Integrated Produc...
DS2762 MAXIM-DS2762 Datasheet
262Kb / 25P
   High-Precision Li Battery Monitor With Alerts
REV: 111703
logo
Texas Instruments
INA301 TI1-INA301 Datasheet
153Kb / 7P
[Old version datasheet]   Current-Shunt Monitor Overcurrent Comparator
logo
Renesas Technology Corp
ISL28025 RENESAS-ISL28025 Datasheet
2Mb / 53P
   Precision Digital Power Monitor with Real Time Alerts
logo
Intersil Corporation
ISL28025 INTERSIL-ISL28025 Datasheet
1Mb / 47P
   Precision Digital Power Monitor with Real Time Alerts
June 17, 2015
logo
Linear Technology
LTC2990CMS LINER-LTC2990CMS Datasheet
60Kb / 1P
   TEMPERATURE, VOLTAGE AND CURRENT MONITOR
logo
Texas Instruments
INA301-Q1 TI1-INA301-Q1 Datasheet
1Mb / 32P
[Old version datasheet]   Current-Shunt Monitor With High-Speed, Overcurrent Protection Comparator
logo
Analog Devices
ADM1186 AD-ADM1186 Datasheet
444Kb / 28P
   Quad Voltage Up and Down Sequencer and Monitor with Programmable Timing
REV. 0
logo
Linear Technology
LTC4151 LINER-LTC4151_15 Datasheet
441Kb / 18P
   High Voltage I2C Current and Voltage Monitor
LTC4151 LINER-LTC4151 Datasheet
239Kb / 16P
   High Voltage I2C Current and Voltage Monitor
LTC2990 LINER-LTC2990 Datasheet
289Kb / 24P
   I2C Temperature, Voltage and Current Monitor
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com