SBAS794E november   2018  – august 2023 DAC60501 , DAC70501 , DAC80501

PRODUCTION DATA  

  1.   1
  2. Features
  3. Applications
  4. Description
  5. Revision History
  6. Device Comparison Table
  7. Pin Configuration and Functions
  8. 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  Timing Requirements: SPI Mode
    7. 7.7  Timing Requirements: I2C Standard Mode
    8. 7.8  Timing Requirements: I2C Fast Mode
    9. 7.9  Timing Requirements: I2C Fast-Mode Plus
    10. 7.10 Timing Diagrams
    11. 7.11 Typical Characteristics
  9. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 DAC Architecture
        1. 8.3.1.1 DAC Transfer Function
        2. 8.3.1.2 DAC Register Structure
        3. 8.3.1.3 Output Amplifier
      2. 8.3.2 Internal Reference
        1. 8.3.2.1 Solder Heat Reflow
      3. 8.3.3 Power-On-Reset (POR)
      4. 8.3.4 Software Reset
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-Down Mode
    5. 8.5 Programming
      1. 8.5.1 Serial Interface
        1. 8.5.1.1 SPI Mode
          1. 8.5.1.1.1 SYNC Interrupt
        2. 8.5.1.2 I2C Mode
          1. 8.5.1.2.1 F/S Mode Protocol
          2. 8.5.1.2.2 I2C Update Sequence
            1. 8.5.1.2.2.1 Address Byte
            2. 8.5.1.2.2.2 Command Byte
            3. 8.5.1.2.2.3 Data Byte (MSDB and LSDB)
          3. 8.5.1.2.3 I2C Read Sequence
    6. 8.6 Register Map
  10. 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
        1. 9.2.2.1 Charge Injection
        2. 9.2.2.2 Voltage Droop
        3. 9.2.2.3 Output Offset Error
        4. 9.2.2.4 Switch Selection
        5. 9.2.2.5 Amplifier Selection
        6. 9.2.2.6 Hold Capacitor Selection
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

I2C Mode

The DACx0501 digital interface is programmed to work in I2C mode when the logic level of the SPI2C pin is 1 at power up. In I2C mode, the DACx0501 have a 2-wire serial interface: SCL, SDA, and one address pin, A0, as shown in Section 6. The I2C bus consists of a data line (SDA) and a clock line (SCL) with pull-up structures. When the bus is idle, both the SDA and SCL lines are pulled high. All the I2C-compatible devices connect to the I2C bus through the open-drain I/O pins, SDA and SCL.

The I2C specification states that the device that controls communication is called a controller, and the devices that are controlled by the controller are called targets. The controller device generates the SCL signal. The controller device also generates special timing conditions (start condition, repeated start condition, and stop condition) on the bus to indicate the start or stop of a data transfer. Device addressing is completed by the controller. The controller device on an I2C bus is typically a microcontroller or DSP. The DACx0501 operate as a target device on the I2C bus. A target device acknowledges controller commands, and upon controller control, receives or transmits data.

Typically, the DACx0501 operate as a target receiver. A controller device writes to the DACx0501, a target receiver. However, if a controller device requires the DACx0501 internal register data, the DACx0501 operate as a target transmitter. In this case, the controller device reads from the DACx0501 According to I2C terminology, read and write refer to the controller device.

The DACx0501 are target devices that support the following data transfer modes:

  1. Standard mode (100Kbps)
  2. Fast mode (400Kbps)
  3. Fast mode plus (1.0Mbps)

The data transfer protocol for standard and fast modes is exactly the same; therefore, these modes are referred to as F/S-mode in this document. The fast-mode plus (FM+) protocol is supported in terms of data transfer speed, but not output current. The low-level output current is 3 mA, similar to the case of standard and fast modes. The DACx0501 support 7-bit addressing. The 10-bit addressing mode is not supported. These devices support the general call reset function. Send the following sequence to initiate a software reset within the device: Start/Repeated Start, 0x00, 0x06, Stop. The reset is asserted within the device on the falling edge of the ACK bit, following the second byte.

Other than specific timing signals, the I2C interface works with serial bytes. At the end of each byte, a ninth clock cycle generates and detects an acknowledge signal. Acknowledge is when the SDA line is pulled low during the high period of the ninth clock cycle. A not-acknowledge is when the SDA line is left high during the high period of the ninth clock cycle as shown in Figure 8-4.

GUID-20230623-SS0I-QKPW-3D72-K2DT9SPWQXFP-low.svg Figure 8-4 Acknowledge and Not Acknowledge on the I2C Bus