SBAS976A May   2019  – May 2020 ADS7138

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      ADS7138 Block Diagram and Applications
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin 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. Table 1. I2C Timing Requirements
    7. Table 2. Timing Requirements
    8. Table 3. I2C Switching Characteristics
    9. 7.6      Switching Characteristics
    10. 7.7      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  Multiplexer and ADC
      2. 8.3.2  Reference
      3. 8.3.3  ADC Transfer Function
      4. 8.3.4  ADC Offset Calibration
      5. 8.3.5  I2C Address Selector
      6. 8.3.6  Programmable Averaging Filter
      7. 8.3.7  CRC on Data Interface
      8. 8.3.8  General-Purpose I/Os (GPIOs)
      9. 8.3.9  Oscillator and Timing Control
      10. 8.3.10 Output Data Format
      11. 8.3.11 Digital Window Comparator
        1. 8.3.11.1 Interrupts From Digital Inputs
        2. 8.3.11.2 Changing Digital Outputs on Alert
          1. 8.3.11.2.1 Changing Digital Outputs on Alerts
            1. 8.3.11.2.1.1 Trigger
            2. 8.3.11.2.1.2 Output Value
      12. 8.3.12 Minimum, Maximum, and Latest Data Registers
      13. 8.3.13 I2C Protocol Features
        1. 8.3.13.1 General Call
        2. 8.3.13.2 General Call With Software Reset
        3. 8.3.13.3 General Call With a Software Write to the Programmable Part of the Slave Address
        4. 8.3.13.4 Configuring the Device for High-Speed I2C Mode
    4. 8.4 Device Functional Modes
      1. 8.4.1 Device Power-Up and Reset
      2. 8.4.2 Manual Mode
      3. 8.4.3 Auto-Sequence Mode
      4. 8.4.4 Autonomous Mode
    5. 8.5 Programming
      1. 8.5.1 Reading Registers
        1. 8.5.1.1 Single Register Read
        2. 8.5.1.2 Reading a Continuous Block of Registers
      2. 8.5.2 Writing Registers
        1. 8.5.2.1 Single Register Write
        2. 8.5.2.2 Set Bit
        3. 8.5.2.3 Clear Bit
        4. 8.5.2.4 Writing a Continuous Block of Registers
    6. 8.6 ADS7138 Registers
      1. 8.6.1   SYSTEM_STATUS Register (Address = 0x0) [reset = 0x81]
        1. Table 15. SYSTEM_STATUS Register Field Descriptions
      2. 8.6.2   GENERAL_CFG Register (Address = 0x1) [reset = 0x0]
        1. Table 16. GENERAL_CFG Register Field Descriptions
      3. 8.6.3   DATA_CFG Register (Address = 0x2) [reset = 0x0]
        1. Table 17. DATA_CFG Register Field Descriptions
      4. 8.6.4   OSR_CFG Register (Address = 0x3) [reset = 0x0]
        1. Table 18. OSR_CFG Register Field Descriptions
      5. 8.6.5   OPMODE_CFG Register (Address = 0x4) [reset = 0x0]
        1. Table 19. OPMODE_CFG Register Field Descriptions
      6. 8.6.6   PIN_CFG Register (Address = 0x5) [reset = 0x0]
        1. Table 20. PIN_CFG Register Field Descriptions
      7. 8.6.7   GPIO_CFG Register (Address = 0x7) [reset = 0x0]
        1. Table 21. GPIO_CFG Register Field Descriptions
      8. 8.6.8   GPO_DRIVE_CFG Register (Address = 0x9) [reset = 0x0]
        1. Table 22. GPO_DRIVE_CFG Register Field Descriptions
      9. 8.6.9   GPO_VALUE Register (Address = 0xB) [reset = 0x0]
        1. Table 23. GPO_VALUE Register Field Descriptions
      10. 8.6.10  GPI_VALUE Register (Address = 0xD) [reset = 0x0]
        1. Table 24. GPI_VALUE Register Field Descriptions
      11. 8.6.11  SEQUENCE_CFG Register (Address = 0x10) [reset = 0x0]
        1. Table 25. SEQUENCE_CFG Register Field Descriptions
      12. 8.6.12  CHANNEL_SEL Register (Address = 0x11) [reset = 0x0]
        1. Table 26. CHANNEL_SEL Register Field Descriptions
      13. 8.6.13  AUTO_SEQ_CH_SEL Register (Address = 0x12) [reset = 0x0]
        1. Table 27. AUTO_SEQ_CH_SEL Register Field Descriptions
      14. 8.6.14  ALERT_CH_SEL Register (Address = 0x14) [reset = 0x0]
        1. Table 28. ALERT_CH_SEL Register Field Descriptions
      15. 8.6.15  ALERT_MAP Register (Address = 0x16) [reset = 0x0]
        1. Table 29. ALERT_MAP Register Field Descriptions
      16. 8.6.16  ALERT_PIN_CFG Register (Address = 0x17) [reset = 0x0]
        1. Table 30. ALERT_PIN_CFG Register Field Descriptions
      17. 8.6.17  EVENT_FLAG Register (Address = 0x18) [reset = 0x0]
        1. Table 31. EVENT_FLAG Register Field Descriptions
      18. 8.6.18  EVENT_HIGH_FLAG Register (Address = 0x1A) [reset = 0x0]
        1. Table 32. EVENT_HIGH_FLAG Register Field Descriptions
      19. 8.6.19  EVENT_LOW_FLAG Register (Address = 0x1C) [reset = 0x0]
        1. Table 33. EVENT_LOW_FLAG Register Field Descriptions
      20. 8.6.20  EVENT_RGN Register (Address = 0x1E) [reset = 0x0]
        1. Table 34. EVENT_RGN Register Field Descriptions
      21. 8.6.21  HYSTERESIS_CH0 Register (Address = 0x20) [reset = 0xF0]
        1. Table 35. HYSTERESIS_CH0 Register Field Descriptions
      22. 8.6.22  HIGH_TH_CH0 Register (Address = 0x21) [reset = 0xFF]
        1. Table 36. HIGH_TH_CH0 Register Field Descriptions
      23. 8.6.23  EVENT_COUNT_CH0 Register (Address = 0x22) [reset = 0x0]
        1. Table 37. EVENT_COUNT_CH0 Register Field Descriptions
      24. 8.6.24  LOW_TH_CH0 Register (Address = 0x23) [reset = 0x0]
        1. Table 38. LOW_TH_CH0 Register Field Descriptions
      25. 8.6.25  HYSTERESIS_CH1 Register (Address = 0x24) [reset = 0xF0]
        1. Table 39. HYSTERESIS_CH1 Register Field Descriptions
      26. 8.6.26  HIGH_TH_CH1 Register (Address = 0x25) [reset = 0xFF]
        1. Table 40. HIGH_TH_CH1 Register Field Descriptions
      27. 8.6.27  EVENT_COUNT_CH1 Register (Address = 0x26) [reset = 0x0]
        1. Table 41. EVENT_COUNT_CH1 Register Field Descriptions
      28. 8.6.28  LOW_TH_CH1 Register (Address = 0x27) [reset = 0x0]
        1. Table 42. LOW_TH_CH1 Register Field Descriptions
      29. 8.6.29  HYSTERESIS_CH2 Register (Address = 0x28) [reset = 0xF0]
        1. Table 43. HYSTERESIS_CH2 Register Field Descriptions
      30. 8.6.30  HIGH_TH_CH2 Register (Address = 0x29) [reset = 0xFF]
        1. Table 44. HIGH_TH_CH2 Register Field Descriptions
      31. 8.6.31  EVENT_COUNT_CH2 Register (Address = 0x2A) [reset = 0x0]
        1. Table 45. EVENT_COUNT_CH2 Register Field Descriptions
      32. 8.6.32  LOW_TH_CH2 Register (Address = 0x2B) [reset = 0x0]
        1. Table 46. LOW_TH_CH2 Register Field Descriptions
      33. 8.6.33  HYSTERESIS_CH3 Register (Address = 0x2C) [reset = 0xF0]
        1. Table 47. HYSTERESIS_CH3 Register Field Descriptions
      34. 8.6.34  HIGH_TH_CH3 Register (Address = 0x2D) [reset = 0xFF]
        1. Table 48. HIGH_TH_CH3 Register Field Descriptions
      35. 8.6.35  EVENT_COUNT_CH3 Register (Address = 0x2E) [reset = 0x0]
        1. Table 49. EVENT_COUNT_CH3 Register Field Descriptions
      36. 8.6.36  LOW_TH_CH3 Register (Address = 0x2F) [reset = 0x0]
        1. Table 50. LOW_TH_CH3 Register Field Descriptions
      37. 8.6.37  HYSTERESIS_CH4 Register (Address = 0x30) [reset = 0xF0]
        1. Table 51. HYSTERESIS_CH4 Register Field Descriptions
      38. 8.6.38  HIGH_TH_CH4 Register (Address = 0x31) [reset = 0xFF]
        1. Table 52. HIGH_TH_CH4 Register Field Descriptions
      39. 8.6.39  EVENT_COUNT_CH4 Register (Address = 0x32) [reset = 0x0]
        1. Table 53. EVENT_COUNT_CH4 Register Field Descriptions
      40. 8.6.40  LOW_TH_CH4 Register (Address = 0x33) [reset = 0x0]
        1. Table 54. LOW_TH_CH4 Register Field Descriptions
      41. 8.6.41  HYSTERESIS_CH5 Register (Address = 0x34) [reset = 0xF0]
        1. Table 55. HYSTERESIS_CH5 Register Field Descriptions
      42. 8.6.42  HIGH_TH_CH5 Register (Address = 0x35) [reset = 0xFF]
        1. Table 56. HIGH_TH_CH5 Register Field Descriptions
      43. 8.6.43  EVENT_COUNT_CH5 Register (Address = 0x36) [reset = 0x0]
        1. Table 57. EVENT_COUNT_CH5 Register Field Descriptions
      44. 8.6.44  LOW_TH_CH5 Register (Address = 0x37) [reset = 0x0]
        1. Table 58. LOW_TH_CH5 Register Field Descriptions
      45. 8.6.45  HYSTERESIS_CH6 Register (Address = 0x38) [reset = 0xF0]
        1. Table 59. HYSTERESIS_CH6 Register Field Descriptions
      46. 8.6.46  HIGH_TH_CH6 Register (Address = 0x39) [reset = 0xFF]
        1. Table 60. HIGH_TH_CH6 Register Field Descriptions
      47. 8.6.47  EVENT_COUNT_CH6 Register (Address = 0x3A) [reset = 0x0]
        1. Table 61. EVENT_COUNT_CH6 Register Field Descriptions
      48. 8.6.48  LOW_TH_CH6 Register (Address = 0x3B) [reset = 0x0]
        1. Table 62. LOW_TH_CH6 Register Field Descriptions
      49. 8.6.49  HYSTERESIS_CH7 Register (Address = 0x3C) [reset = 0xF0]
        1. Table 63. HYSTERESIS_CH7 Register Field Descriptions
      50. 8.6.50  HIGH_TH_CH7 Register (Address = 0x3D) [reset = 0xFF]
        1. Table 64. HIGH_TH_CH7 Register Field Descriptions
      51. 8.6.51  EVENT_COUNT_CH7 Register (Address = 0x3E) [reset = 0x0]
        1. Table 65. EVENT_COUNT_CH7 Register Field Descriptions
      52. 8.6.52  LOW_TH_CH7 Register (Address = 0x3F) [reset = 0x0]
        1. Table 66. LOW_TH_CH7 Register Field Descriptions
      53. 8.6.53  MAX_CH0_LSB Register (Address = 0x60) [reset = 0x0]
        1. Table 67. MAX_CH0_LSB Register Field Descriptions
      54. 8.6.54  MAX_CH0_MSB Register (Address = 0x61) [reset = 0x0]
        1. Table 68. MAX_CH0_MSB Register Field Descriptions
      55. 8.6.55  MAX_CH1_LSB Register (Address = 0x62) [reset = 0x0]
        1. Table 69. MAX_CH1_LSB Register Field Descriptions
      56. 8.6.56  MAX_CH1_MSB Register (Address = 0x63) [reset = 0x0]
        1. Table 70. MAX_CH1_MSB Register Field Descriptions
      57. 8.6.57  MAX_CH2_LSB Register (Address = 0x64) [reset = 0x0]
        1. Table 71. MAX_CH2_LSB Register Field Descriptions
      58. 8.6.58  MAX_CH2_MSB Register (Address = 0x65) [reset = 0x0]
        1. Table 72. MAX_CH2_MSB Register Field Descriptions
      59. 8.6.59  MAX_CH3_LSB Register (Address = 0x66) [reset = 0x0]
        1. Table 73. MAX_CH3_LSB Register Field Descriptions
      60. 8.6.60  MAX_CH3_MSB Register (Address = 0x67) [reset = 0x0]
        1. Table 74. MAX_CH3_MSB Register Field Descriptions
      61. 8.6.61  MAX_CH4_LSB Register (Address = 0x68) [reset = 0x0]
        1. Table 75. MAX_CH4_LSB Register Field Descriptions
      62. 8.6.62  MAX_CH4_MSB Register (Address = 0x69) [reset = 0x0]
        1. Table 76. MAX_CH4_MSB Register Field Descriptions
      63. 8.6.63  MAX_CH5_LSB Register (Address = 0x6A) [reset = 0x0]
        1. Table 77. MAX_CH5_LSB Register Field Descriptions
      64. 8.6.64  MAX_CH5_MSB Register (Address = 0x6B) [reset = 0x0]
        1. Table 78. MAX_CH5_MSB Register Field Descriptions
      65. 8.6.65  MAX_CH6_LSB Register (Address = 0x6C) [reset = 0x0]
        1. Table 79. MAX_CH6_LSB Register Field Descriptions
      66. 8.6.66  MAX_CH6_MSB Register (Address = 0x6D) [reset = 0x0]
        1. Table 80. MAX_CH6_MSB Register Field Descriptions
      67. 8.6.67  MAX_CH7_LSB Register (Address = 0x6E) [reset = 0x0]
        1. Table 81. MAX_CH7_LSB Register Field Descriptions
      68. 8.6.68  MAX_CH7_MSB Register (Address = 0x6F) [reset = 0x0]
        1. Table 82. MAX_CH7_MSB Register Field Descriptions
      69. 8.6.69  MIN_CH0_LSB Register (Address = 0x80) [reset = 0xFF]
        1. Table 83. MIN_CH0_LSB Register Field Descriptions
      70. 8.6.70  MIN_CH0_MSB Register (Address = 0x81) [reset = 0xFF]
        1. Table 84. MIN_CH0_MSB Register Field Descriptions
      71. 8.6.71  MIN_CH1_LSB Register (Address = 0x82) [reset = 0xFF]
        1. Table 85. MIN_CH1_LSB Register Field Descriptions
      72. 8.6.72  MIN_CH1_MSB Register (Address = 0x83) [reset = 0xFF]
        1. Table 86. MIN_CH1_MSB Register Field Descriptions
      73. 8.6.73  MIN_CH2_LSB Register (Address = 0x84) [reset = 0xFF]
        1. Table 87. MIN_CH2_LSB Register Field Descriptions
      74. 8.6.74  MIN_CH2_MSB Register (Address = 0x85) [reset = 0xFF]
        1. Table 88. MIN_CH2_MSB Register Field Descriptions
      75. 8.6.75  MIN_CH3_LSB Register (Address = 0x86) [reset = 0xFF]
        1. Table 89. MIN_CH3_LSB Register Field Descriptions
      76. 8.6.76  MIN_CH3_MSB Register (Address = 0x87) [reset = 0xFF]
        1. Table 90. MIN_CH3_MSB Register Field Descriptions
      77. 8.6.77  MIN_CH4_LSB Register (Address = 0x88) [reset = 0xFF]
        1. Table 91. MIN_CH4_LSB Register Field Descriptions
      78. 8.6.78  MIN_CH4_MSB Register (Address = 0x89) [reset = 0xFF]
        1. Table 92. MIN_CH4_MSB Register Field Descriptions
      79. 8.6.79  MIN_CH5_LSB Register (Address = 0x8A) [reset = 0xFF]
        1. Table 93. MIN_CH5_LSB Register Field Descriptions
      80. 8.6.80  MIN_CH5_MSB Register (Address = 0x8B) [reset = 0xFF]
        1. Table 94. MIN_CH5_MSB Register Field Descriptions
      81. 8.6.81  MIN_CH6_LSB Register (Address = 0x8C) [reset = 0xFF]
        1. Table 95. MIN_CH6_LSB Register Field Descriptions
      82. 8.6.82  MIN_CH6_MSB Register (Address = 0x8D) [reset = 0xFF]
        1. Table 96. MIN_CH6_MSB Register Field Descriptions
      83. 8.6.83  MIN_CH7_LSB Register (Address = 0x8E) [reset = 0xFF]
        1. Table 97. MIN_CH7_LSB Register Field Descriptions
      84. 8.6.84  MIN_CH7_MSB Register (Address = 0x8F) [reset = 0xFF]
        1. Table 98. MIN_CH7_MSB Register Field Descriptions
      85. 8.6.85  RECENT_CH0_LSB Register (Address = 0xA0) [reset = 0x0]
        1. Table 99. RECENT_CH0_LSB Register Field Descriptions
      86. 8.6.86  RECENT_CH0_MSB Register (Address = 0xA1) [reset = 0x0]
        1. Table 100. RECENT_CH0_MSB Register Field Descriptions
      87. 8.6.87  RECENT_CH1_LSB Register (Address = 0xA2) [reset = 0x0]
        1. Table 101. RECENT_CH1_LSB Register Field Descriptions
      88. 8.6.88  RECENT_CH1_MSB Register (Address = 0xA3) [reset = 0x0]
        1. Table 102. RECENT_CH1_MSB Register Field Descriptions
      89. 8.6.89  RECENT_CH2_LSB Register (Address = 0xA4) [reset = 0x0]
        1. Table 103. RECENT_CH2_LSB Register Field Descriptions
      90. 8.6.90  RECENT_CH2_MSB Register (Address = 0xA5) [reset = 0x0]
        1. Table 104. RECENT_CH2_MSB Register Field Descriptions
      91. 8.6.91  RECENT_CH3_LSB Register (Address = 0xA6) [reset = 0x0]
        1. Table 105. RECENT_CH3_LSB Register Field Descriptions
      92. 8.6.92  RECENT_CH3_MSB Register (Address = 0xA7) [reset = 0x0]
        1. Table 106. RECENT_CH3_MSB Register Field Descriptions
      93. 8.6.93  RECENT_CH4_LSB Register (Address = 0xA8) [reset = 0x0]
        1. Table 107. RECENT_CH4_LSB Register Field Descriptions
      94. 8.6.94  RECENT_CH4_MSB Register (Address = 0xA9) [reset = 0x0]
        1. Table 108. RECENT_CH4_MSB Register Field Descriptions
      95. 8.6.95  RECENT_CH5_LSB Register (Address = 0xAA) [reset = 0x0]
        1. Table 109. RECENT_CH5_LSB Register Field Descriptions
      96. 8.6.96  RECENT_CH5_MSB Register (Address = 0xAB) [reset = 0x0]
        1. Table 110. RECENT_CH5_MSB Register Field Descriptions
      97. 8.6.97  RECENT_CH6_LSB Register (Address = 0xAC) [reset = 0x0]
        1. Table 111. RECENT_CH6_LSB Register Field Descriptions
      98. 8.6.98  RECENT_CH6_MSB Register (Address = 0xAD) [reset = 0x0]
        1. Table 112. RECENT_CH6_MSB Register Field Descriptions
      99. 8.6.99  RECENT_CH7_LSB Register (Address = 0xAE) [reset = 0x0]
        1. Table 113. RECENT_CH7_LSB Register Field Descriptions
      100. 8.6.100 RECENT_CH7_MSB Register (Address = 0xAF) [reset = 0x0]
        1. Table 114. RECENT_CH7_MSB Register Field Descriptions
      101. 8.6.101 GPO0_TRIG_EVENT_SEL Register (Address = 0xC3) [reset = 0x2]
        1. Table 115. GPO0_TRIG_EVENT_SEL Register Field Descriptions
      102. 8.6.102 GPO1_TRIG_EVENT_SEL Register (Address = 0xC5) [reset = 0x2]
        1. Table 116. GPO1_TRIG_EVENT_SEL Register Field Descriptions
      103. 8.6.103 GPO2_TRIG_EVENT_SEL Register (Address = 0xC7) [reset = 0x2]
        1. Table 117. GPO2_TRIG_EVENT_SEL Register Field Descriptions
      104. 8.6.104 GPO3_TRIG_EVENT_SEL Register (Address = 0xC9) [reset = 0x2]
        1. Table 118. GPO3_TRIG_EVENT_SEL Register Field Descriptions
      105. 8.6.105 GPO4_TRIG_EVENT_SEL Register (Address = 0xCB) [reset = 0x2]
        1. Table 119. GPO4_TRIG_EVENT_SEL Register Field Descriptions
      106. 8.6.106 GPO5_TRIG_EVENT_SEL Register (Address = 0xCD) [reset = 0x2]
        1. Table 120. GPO5_TRIG_EVENT_SEL Register Field Descriptions
      107. 8.6.107 GPO6_TRIG_EVENT_SEL Register (Address = 0xCF) [reset = 0x2]
        1. Table 121. GPO6_TRIG_EVENT_SEL Register Field Descriptions
      108. 8.6.108 GPO7_TRIG_EVENT_SEL Register (Address = 0xD1) [reset = 0x2]
        1. Table 122. GPO7_TRIG_EVENT_SEL Register Field Descriptions
      109. 8.6.109 GPO_TRIGGER_CFG Register (Address = 0xE9) [reset = 0x0]
        1. Table 123. GPO_TRIGGER_CFG Register Field Descriptions
      110. 8.6.110 GPO_VALUE_TRIG Register (Address = 0xEB) [reset = 0x0]
        1. Table 124. GPO_VALUE_TRIG Register Field Descriptions
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Mixed-Channel Configuration
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Digital Input
          2. 9.2.1.2.2 Digital Open-Drain Output
        3. 9.2.1.3 Application Curve
      2. 9.2.2 Digital Push-Pull Output
  10. 10Power Supply Recommendations
    1. 10.1 AVDD and DVDD Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

8.1 Overview

The ADS7138 is a small, eight-channel, multiplexed, 12-bit, analog-to-digital converter (ADC) with an I2C-compatible serial interface. The eight channels of the ADS7138 can be individually configured as either analog inputs, digital inputs, or digital outputs. The device includes a digital comparator with a dedicated alert pin that can be used to interrupt the host when a programmed high or low threshold is crossed on any input channel. The device uses an internal oscillator for conversion. The ADC can be used in the manual mode for reading ADC data over the I2C interface or in autonomous mode for monitoring the analog inputs without an active I2C interface.

The device features a programmable averaging filter that outputs a 16-bit result for enhanced resolution.

The I2C serial interface supports standard-mode, fast-mode, fast-mode plus, and high-speed mode. The device also features an 8-bit cyclic redundancy check (CRC) for the serial communication interface.