SBOS743B July   2015  – September 2024 INA226-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Basic ADC Functions
        1. 6.3.1.1 Power Calculation
        2. 6.3.1.2 Alert Pin
    4. 6.4 Device Functional Modes
      1. 6.4.1 Averaging and Conversion Time Considerations
      2. 6.4.2 Filtering and Input Considerations
    5. 6.5 Programming
      1. 6.5.1 Programming the Calibration Register
      2. 6.5.2 Programming the Power Measurement Engine
        1. 6.5.2.1 Calibration Register and Scaling
      3. 6.5.3 Simple Current Shunt Monitor Usage (No Programming Necessary)
      4. 6.5.4 Default Settings
      5. 6.5.5 Bus Overview
        1. 6.5.5.1 Serial Bus Address
        2. 6.5.5.2 Serial Interface
        3. 6.5.5.3 Writing to and Reading From the INA226-Q1
          1. 6.5.5.3.1 High-Speed I2C Mode
        4. 6.5.5.4 SMBus Alert Response
  8. 7 Registers
    1. 7.1 Register Maps
      1. 7.1.1  Configuration Register (00h) (Read/Write)
      2. 7.1.2  Shunt Voltage Register (01h) (Read-Only)
      3. 7.1.3  Bus Voltage Register (02h) (Read-Only) #GUID-792F23A7-1E45-4FB9-9334-0BF769622DE4/SBOS5477597
      4. 7.1.4  Power Register (03h) (Read-Only)
      5. 7.1.5  Current Register (04h) (Read-Only)
      6. 7.1.6  Calibration Register (05h) (Read/Write)
      7. 7.1.7  Mask/Enable Register (06h) (Read/Write)
      8. 7.1.8  Alert Limit Register (07h) (Read/Write)
      9. 7.1.9  Manufacturer ID Register (FEh) (Read-Only)
      10. 7.1.10 Die ID Register (FFh) (Read-Only)
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 High-Side Sensing Circuit Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.1.1 Configuration Register (00h) (Read/Write)

Table 7-2 Configuration Register (00h) (Read/Write) Descriptions
BIT NO.D15D14D13D12D11D10D9D8D7D6D5D4D3D2D1D0
BIT
NAME		RST———AVG2AVG1AVG0VBUSCT2VBUSCT1VBUSCT0VSHCT2VSHCT1VSHCT0MODE3MODE2MODE1
POR VALUE0100000100100111

The Configuration Register settings control the operating modes for the device. This register controls the conversion time settings for both the shunt and bus voltage measurements as well as the averaging mode used. The operating mode that controls what signals are selected to be measured is also programmed in the Configuration Register .

The Configuration Register can be read from at any time without impacting or affecting the device settings or a conversion in progress. Writing to the Configuration Register halts any conversion in progress until the write sequence is completed resulting in a new conversion starting based on the new contents of the Configuration Register (00h). This halt prevents any uncertainty in the conditions used for the next completed conversion.

RST:Reset Bit
Bit 15Setting this bit to '1' generates a system reset that is the same as power-on reset. Resets all registers to default values; this bit self-clears.
AVG:Averaging Mode
Bits 9–11Determines the number of samples that are collected and averaged. Table 7-3 shows all the AVG bit settings and related number of averages for each bit setting.
Table 7-3 AVG Bit Settings[11:9] Combinations
AVG2
D11		AVG1
D10		AVG0
D9		NUMBER OF
AVERAGES(1)
0001
0014
01016
01164
100128
101256
110512
1111024
(1) Shaded values are default.
VBUSCT:Bus Voltage Conversion Time
Bits 6–8Sets the conversion time for the bus voltage measurement. Table 7-4 shows the VBUSCT bit options and related conversion times for each bit setting.
Table 7-4 VBUSCT Bit Settings [8:6] Combinations
VBUSCT2
D8		VBUSCT1
D7		VBUSCT0
D6		CONVERSION TIME(1)
000140 µs
001204 µs
010332 µs
011588 µs
1001.1 ms
1012.116 ms
1104.156 ms
1118.244 ms
(1) Shaded values are default.
VSHCT:Shunt Voltage Conversion Time
Bits 3–5Sets the conversion time for the shunt voltage measurement. Table 7-5 shows the VSHCT bit options and related conversion times for each bit setting.
Table 7-5 VSHCT Bit Settings [5:3] Combinations
VSHCT2
D8		VSHCT1
D7		VSHCT0
D6		CONVERSION TIME(1)
000140 µs
001204 µs
010332 µs
011588 µs
1001.1 ms
1012.116 ms
1104.156 ms
1118.244 ms
(1) Shaded values are default.
MODE:Operating Mode
Bits 0-2Selects continuous, triggered, or power-down mode of operation. These bits default to continuous shunt and bus measurement mode. The mode settings are shown in Table 7-6.
Table 7-6 Mode Settings [2:0] Combinations
MODE3
D2		MODE2
D1		MODE1
D0		MODE(1)
000Power-Down (or Shutdown)
001Shunt Voltage, Triggered
010Bus Voltage, Triggered
011Shunt and Bus, Triggered
100Power-Down (or Shutdown)
101Shunt Voltage, Continuous
110Bus Voltage, Continuous
111Shunt and Bus, Continuous
(1) Shaded values are default.