SBOS743A July   2015  – May 2020 INA226-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      High-Side or Low-Side Sensing Application
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Basic ADC Functions
        1. 7.3.1.1 Power Calculation
        2. 7.3.1.2 Alert Pin
    4. 7.4 Device Functional Modes
      1. 7.4.1 Averaging and Conversion Time Considerations
      2. 7.4.2 Filtering and Input Considerations
    5. 7.5 Programming
      1. 7.5.1 Programming the Calibration Register
      2. 7.5.2 Programming the Power Measurement Engine
        1. 7.5.2.1 Calibration Register and Scaling
      3. 7.5.3 Simple Current Shunt Monitor Usage (No Programming Necessary)
      4. 7.5.4 Default Settings
      5. 7.5.5 Bus Overview
        1. 7.5.5.1 Serial Bus Address
        2. 7.5.5.2 Serial Interface
        3. 7.5.5.3 Writing to and Reading from the INA226-Q1
          1. 7.5.5.3.1 High-Speed I2C Mode
        4. 7.5.5.4 SMBus Alert Response
    6. 7.6 Register Maps
      1. Table 4. Register Set Summary
      2. 7.6.1    Configuration Register (00h) (Read/Write)
        1. Table 5. Configuration Register (00h) (Read/Write) Descriptions
      3. 7.6.2    Shunt Voltage Register (01h) (Read-Only)
        1. Table 10. Shunt Voltage Register (01h) (Read-Only) Description
      4. 7.6.3    Bus Voltage Register (02h) (Read-Only)
        1. Table 11. Bus Voltage Register (02h) (Read-Only) Description
      5. 7.6.4    Power Register (03h) (Read-Only)
        1. Table 12. Power Register (03h) (Read-Only) Description
      6. 7.6.5    Current Register (04h) (Read-Only)
        1. Table 13. Current Register (04h) (Read-Only) Register Description
      7. 7.6.6    Calibration Register (05h) (Read/Write)
        1. Table 14. Calibration Register (05h) (Read/Write) Description
      8. 7.6.7    Mask/Enable Register (06h) (Read/Write)
        1. Table 15. Mask/Enable Register (06h) (Read/Write)
      9. 7.6.8    Alert Limit Register (07h) (Read/Write)
        1. Table 16. Alert Limit Register (07h) (Read/Write) Description
      10. 7.6.9    Manufacturer ID Register (FEh) (Read-Only)
        1. Table 17. Manufacturer ID Register (FEh) (Read-Only) Description
      11. 7.6.10   Die ID Register (FFh) (Read-Only)
        1. Table 18. Die ID Register (FFh) (Read-Only) Description
  8. 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
          1. Table 19. Configuration Register (00h) Settings for (Value = 4025h)
          2. Table 20. Configuration Register (00h) Settings for (Value = 4005h)
          3. Table 21. Mask/Enable Register (06h) Settings for and (Value = 8000h)
          4. Table 22. Alert Limit Register (07h) Settings for and (Value = 7D00)
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

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

Table 5. Configuration Register (00h) (Read/Write) Descriptions

BIT NO. D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
BIT
NAME		 RST — — — AVG2 AVG1 AVG0 VBUSCT2 VBUSCT1 VBUSCT0 VSHCT2 VSHCT1 VSHCT0 MODE3 MODE2 MODE1
POR VALUE 0 1 0 0 0 0 0 1 0 0 1 0 0 1 1 1

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 15 Setting 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 9–11 Determines the number of samples that are collected and averaged. Table 6 shows all the AVG bit settings and related number of averages for each bit setting.

Table 6. AVG Bit Settings[11:9] Combinations

AVG2
D11		 AVG1
D10		 AVG0
D9		 NUMBER OF
AVERAGES(1)
0 0 0 1
0 0 1 4
0 1 0 16
0 1 1 64
1 0 0 128
1 0 1 256
1 1 0 512
1 1 1 1024
(1) Shaded values are default.
VBUSCT: Bus Voltage Conversion Time
Bits 6–8 Sets the conversion time for the bus voltage measurement. Table 7 shows the VBUSCT bit options and related conversion times for each bit setting.

Table 7. VBUSCT Bit Settings [8:6] Combinations

VBUSCT2
D8		 VBUSCT1
D7		 VBUSCT0
D6		 CONVERSION TIME(1)
0 0 0 140 µs
0 0 1 204 µs
0 1 0 332 µs
0 1 1 588 µs
1 0 0 1.1 ms
1 0 1 2.116 ms
1 1 0 4.156 ms
1 1 1 8.244 ms
(1) Shaded values are default.
VSHCT: Shunt Voltage Conversion Time
Bits 3–5 Sets the conversion time for the shunt voltage measurement. Table 8 shows the VSHCT bit options and related conversion times for each bit setting.

Table 8. VSHCT Bit Settings [5:3] Combinations

VSHCT2
D8		 VSHCT1
D7		 VSHCT0
D6		 CONVERSION TIME(1)
0 0 0 140 µs
0 0 1 204 µs
0 1 0 332 µs
0 1 1 588 µs
1 0 0 1.1 ms
1 0 1 2.116 ms
1 1 0 4.156 ms
1 1 1 8.244 ms
(1) Shaded values are default.
MODE: Operating Mode
Bits 0-2 Selects 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 9.

Table 9. Mode Settings [2:0] Combinations

MODE3
D2		 MODE2
D1		 MODE1
D0		 MODE(1)
0 0 0 Power-Down (or Shutdown)
0 0 1 Shunt Voltage, Triggered
0 1 0 Bus Voltage, Triggered
0 1 1 Shunt and Bus, Triggered
1 0 0 Power-Down (or Shutdown)
1 0 1 Shunt Voltage, Continuous
1 1 0 Bus Voltage, Continuous
1 1 1 Shunt and Bus, Continuous
(1) Shaded values are default.