SBOS776C March   2016  – March 2021 INA3221-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Basic ADC Functions
      2. 8.3.2 Alert Monitoring
        1. 8.3.2.1 Critical Alert
          1. 8.3.2.1.1 Summation Control Function
        2. 8.3.2.2 Warning Alert
        3. 8.3.2.3 Power-Valid Alert
        4. 8.3.2.4 Timing-Control Alert
        5. 8.3.2.5 Default Settings
      3. 8.3.3 Software Reset
    4. 8.4 Device Functional Modes
      1. 8.4.1 Averaging Function
      2. 8.4.2 Multiple Channel Monitoring
        1. 8.4.2.1 Channel Configuration
        2. 8.4.2.2 Averaging and Conversion-Time Considerations
      3. 8.4.3 Filtering and Input Considerations
    5. 8.5 Programming
      1. 8.5.1 Bus Overview
        1. 8.5.1.1 Serial Bus Address
        2. 8.5.1.2 Serial Interface
      2. 8.5.2 Writing To and Reading From the INA3221-Q1
        1. 8.5.2.1 High-Speed I2C Mode
      3. 8.5.3 SMBus Alert Response
    6. 8.6 Register Maps
      1. 8.6.1 Summary of Register Set
      2. 8.6.2 Register Descriptions
        1. 8.6.2.1  Configuration Register (address = 00h) [reset = 7127h]
        2. 8.6.2.2  Channel-1 Shunt-Voltage Register (address = 01h), [reset = 00h]
        3. 8.6.2.3  Channel-1 Bus-Voltage Register (address = 02h) [reset = 00h]
        4. 8.6.2.4  Channel-2 Shunt-Voltage Register (address = 03h) [reset = 00h]
        5. 8.6.2.5  Channel-2 Bus-Voltage Register (address = 04h) [reset = 00h]
        6. 8.6.2.6  Channel-3 Shunt-Voltage Register (address = 05h) [reset = 00h]
        7. 8.6.2.7  Channel-3 Bus-Voltage Register (address = 06h) [reset = 00h]
        8. 8.6.2.8  Channel-1 Critical-Alert Limit Register (address = 07h) [reset = 7FF8h]
        9. 8.6.2.9  Warning-Alert Channel-1 Limit Register (address = 08h) [reset = 7FF8h]
        10. 8.6.2.10 Channel-2 Critical-Alert Limit Register (address = 09h) [reset = 7FF8h]
        11. 8.6.2.11 Channel-2 Warning-Alert Limit Register (address = 0Ah) [reset = 7FF8h]
        12. 8.6.2.12 Channel-3 Critical-Alert Limit Register (address = 0Bh) [reset = 7FF8h]
        13. 8.6.2.13 Channel-3 Warning-Alert Limit Register (address = 0Ch) [reset = 7FF8h]
        14. 8.6.2.14 Shunt-Voltage Sum Register (address = 0Dh) [reset = 00h]
        15. 8.6.2.15 Shunt-Voltage Sum-Limit Register (address = 0Eh) [reset = 7FFEh]
        16. 8.6.2.16 Mask/Enable Register (address = 0Fh) [reset = 0002h]
        17. 8.6.2.17 Power-Valid Upper-Limit Register (address = 10h) [reset = 2710h]
        18. 8.6.2.18 Power-Valid Lower-Limit Register (address = 11h) [reset = 2328h]
        19. 8.6.2.19 Manufacturer ID Register (address = FEh) [reset = 5449h]
        20. 8.6.2.20 Die ID Register (address = FFh) [reset = 3220]
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.6.2.1 Configuration Register (address = 00h) [reset = 7127h]

The Configuration register settings control the operating modes for the shunt- and bus-voltage measurements for the three input channels. This register controls the conversion time settings for both the shunt- and bus-voltage measurements and the averaging mode used. The Configuration register is used to independently enable or disable each channel, as well as select the operating mode that controls which signals are selected to be measured.

This register can be read from at any time without impacting or affecting either device settings or conversions in progress. Writing to this register halts any conversion in progress until the write sequence is completed, resulting in a new conversion starting, based on the new Configuration register contents. This architecture prevents any uncertainty in the conditions used for the next completed conversion.

Table 8-5 Configuration Register
1514131211109876543210
RSTCH1enCH2enCH3enAVG2AVG1AVG0VBUS
CT2		VBUS
CT1		VBUS
CT0		VSH
CT2		VSH
CT1		VSH
CT0		MODE
3		MODE
2		MODE
1
RW-0RW-1RW-1RW-1RW-0RW-0RW-0RW-1RW-0RW-0RW-1RW-0RW-0RW-1RW-1RW-1
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8-6 Configuration Register Field Descriptions
BitFieldTypeResetDescription
15RSTR/W0hReset bit. Set this bit = 1 to generate a system reset that is the same as a power-on reset (POR). This bit resets all registers to default values and self-clears.
14CH1enR/W7hChannel enable mode. These bits allow each channel to be independently enabled or disabled.
0 = Channel disable
1 = Channel enable (default)
13CH2en
12CH3en
11-9AVG2-0R/W0hAveraging mode. These bits set the number of samples that are collected and averaged together.
000 = 1 (default)
001 = 4
010 = 16
011 = 64
100 = 128
101 = 256
110 = 512
111 = 1024
8-6VBUSCT2-0R/W4hBus-voltage conversion time. These bits set the conversion time for the bus-voltage measurement.
000 = 140 μs
001 = 204 μs
010 = 332 μs
011 = 588 μs
100 = 1.1 ms (default)
101 = 2.116 ms
110 = 4.156 ms
111 = 8.244 ms
5-3VSHCT2-0R/W4hShunt-voltage conversion time. These bits set the conversion time for the shunt-voltage measurement.
The conversion-time bit settings for VSHCT2-0 are the same as VBUSCT2-0 (bits 8-6) listed in the previous row.
2-0MODE3-1R/W7hOperating mode. These bits select continuous, single-shot (triggered), or power-down mode of operation. These bits default to continuous shunt and bus mode.
000 = Power-down
001 = Shunt voltage, single-shot (triggered)
010 = Bus voltage, single-shot (triggered)
011 = Shunt and bus, single-shot (triggered)
100 = Power-down
101 = Shunt voltage, continuous
110 = Bus voltage, continuous
111 = Shunt and bus, continuous (default)