ZHCSLR4F december   2019  – july 2023 TMUX1308-Q1 , TMUX1309-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information: TMUX1308-Q1
    5. 7.5  Thermal Information: TMUX1309-Q1
    6. 7.6  Electrical Characteristics
    7. 7.7  Logic and Dynamic Characteristics
    8. 7.8  Timing Characteristics
    9. 7.9  Injection Current Coupling
    10. 7.10 Typical Characteristics
  9. 8 Parameter Measurement Information
    1. 8.1  On-Resistance
    2. 8.2  Off-Leakage Current
    3. 8.3  On-Leakage Current
    4. 8.4  Transition Time
    5. 8.5  Break-Before-Make
    6. 8.6  tON(EN) and tOFF(EN)
    7. 8.7  Charge Injection
    8. 8.8  Off Isolation
    9. 8.9  Crosstalk
    10. 8.10 Bandwidth
    11. 8.11 Injection Current Control
  10. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Bidirectional Operation
      2. 9.3.2 Rail-to-Rail Operation
      3. 9.3.3 1.8 V Logic Compatible Inputs
      4. 9.3.4 Fail-Safe Logic
      5. 9.3.5 Injection Current Control
        1. 9.3.5.1 TMUX13xx-Q1 is Powered, Channel is Unselected, and the Input Signal is Greater Than VDD (VDD = 5 V, VINPUT = 5.5 V)
        2. 9.3.5.2 TMUX13xx-Q1 is Powered, Channel is Selected, and the Input Signal is Greater Than VDD (VDD = 5 V, VINPUT = 5.5 V)
        3. 9.3.5.3 TMUX13xx-Q1 is Unpowered and the Input Signal has a Voltage Present (VDD = 0 V, VINPUT = 3 V)
    4. 9.4 Device Functional Modes
    5. 9.5 Truth Tables
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Short To Battery Protection
    3. 10.3 Power Supply Recommendations
    4. 10.4 Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 静电放电警告
    6. 11.6 术语表
  13. 12Mechanical, Packaging, and Orderable Information

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10.2.3 Short To Battery Protection

When evaluating the safety and reliability of an automotive grade multiplexer, it is important to note their performance under various operating conditions. In the case of TMUX13xx-Q1, we examine it's response to various short-to-battery conditions to provide insight on system level design for automotive optimization. It is important to design around short-to-battery as failure to do so can result in operational issues. The following section shows a deep dive into three scenarios to demonstrate the behavior of the TMUX1308-Q1 under short-to-battery conditions using a 5V supply voltage.

We begin with the following setup to explore our first scenario with channel S7 selected and channel S0 experiencing a short-to-battery condition.

GUID-20230623-SS0I-VNKW-LMHP-0HVZXSGFHB9W-low.svgFigure 10-3 Channel S7 selected, Channel S0 experiencing a short-to-battery condition

Table 10-2 indicates values of ∆VOUT, VSBAT and minimum RLIM for various VBAT cases when considering a maximum allotment of 25mAfor IS/ID. Choosing too large of an RLIM will negatively affect ∆VOUT as well as substantially limit current flow. Choosing too small of an RLIM can damage the device.

Table 10-2 RLim Values for 25mA Through the Switch
VBATRLIM∆VOUT (typ)VSBAT

12V

470

< 10 uV

5.6V

19V

750

< 10 uV

5.6V

24V

1K

< 10 uV

5.6V

36V

1.5K

< 10 uV

5.6V

48V

2K

< 10 uV

5.6V

60V

2.4K

< 10 uV

5.6V

GUID-20230623-SS0I-QHFN-QTF3-5H2S8TWM6RPD-low.svgFigure 10-4 All Unselected Channels Experiencing a Short-to-Battery Condition

We then evaluate the scenario of seeing a short to battery condition on all unselected channels at the same time. The below table indicates values when considering a maximum allotment of 12.5mA for IS/ID. If you have the potential to see short to battery on all channels at the same time, then 12.5 mA is the limiting factor. Here again choosing too large of an RLIM will negatively affect ∆VOUT as well as substantially limit current flow. Choosing too small of an RLIM can also damage the device.

Table 10-3 RLim Values for 12.5mA Through the Switch

VBAT

RLIM

∆VOUT (typ)

VSBAT

12V

1K

< 10 uV

5.6V

19V

1.5K

< 10 uV

5.6V

24V

2K

< 10 uV

5.6V

36V

3K

< 10 uV

5.6V

48V

3.9K

< 10 uV

5.6V

60V

4.7K

< 10 uV

5.6V

GUID-20230623-SS0I-SBNR-VRQK-GBGXCJRGZGCQ-low.svgFigure 10-5 Short-to-Battery Condition Only on a Single Selected Channel

We then evaluate the scenario of a short to battery occurring when the switch is closed using a 5V supply. As such, input voltage needs to be limited to 6V. The below table indicates values of RLIM needed to keep the voltage of a selected channel under 6V using a standard 5V VDD for all short to battery cases. Choosing too large of an RLIM will negatively affect ∆VOUT as well as substantially limit current flow. Choosing too small of an RLIM can also damage the device.

Table 10-4 RLim Values for <6V Through the Switch

VBAT

RLIM

∆VOUT (typ)

VSBAT

12V

1.6K

< 10 uV

5.9V

18V

3K

< 10 uV

5.9V

19V

3.3K

< 10 uV

5.9V

24V

4.7K

< 10 uV

5.9V

36V

10K

< 10 uV

5.9V

48V

13K

< 10 uV

5.9V

60V

15K

< 10 uV

5.9V

In conclusion, several short-to-battery case studies were observed using a 5V supply. Note that if using a lower supply voltage, the RLim values will change for optimal current flow. It is important to protect against short to battery conditions as a failure to do so can result in system level issues. Caution must be observed to design around these conditions and the electrical characteristics of the device such that proper operation of the device is guaranteed.