SLLA578 June   2022 TLIN1431-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Startup
    1. 1.1 Operational Voltages
    2. 1.2 Power-Up and INIT Mode
  4. 2Pin Control
    1. 2.1 Typical Application
    2. 2.2 Power-Up into Normal Mode in Pin Control
      1. 2.2.1 Restart Mode from INIT Mode in Pin Control
      2. 2.2.2 Standby Mode from Restart Mode in Pin Control
      3. 2.2.3 Normal Mode in Pin Control
    3. 2.3 Power-Up into Fast Mode in Pin Control
    4. 2.4 Sleep Mode to Normal Mode in Pin Control
    5. 2.5 Fail-Safe Mode to Normal Mode in Pin Control
  5. 3SPI Control
    1. 3.1 Typical Application
    2. 3.2 Power-Up into Normal Mode in SPI Control
      1. 3.2.1 Restart Mode from INIT Mode in SPI Control
      2. 3.2.2 Standby Mode from Restart Mode in SPI Control
      3. 3.2.3 Normal Mode in SPI Control
    3. 3.3 Power-Up into Fast Mode in SPI Control
    4. 3.4 Sleep Mode to Normal Mode in SPI Control
    5. 3.5 Fail-Safe Mode to Normal Mode in SPI Control
    6. 3.6 Configuring Watchdog through SPI
  6. 4Pin Assignments in Pin Control vs. SPI Control
  7. 5References

4 Pin Assignments in Pin Control vs. SPI Control

The TLIN1431-Q1 is capable of operating in one of two different configurations: pin control or SPI control. Pins 4 through 9 of the device change functionality based upon this configuration, as shown in Table 4-1.

Table 4-1 Functional Differences Between Pins 4 through 7 in Pin Control vs. in SPI Control
Pin Pin Control SPI Control
4 WDT – Programmable watchdog window set input CLK – SPI clock input
5 nWDR – Watchdog failure output trigger SDO – SPI serial data output
6 WDI – Watchdog timer edge-triggered input SDI – SPI serial data input
7 PIN – Input that sets the device to pin control nCS – SPI chip select
8 EN – Device mode change input nINT – Device interrupt output
9 HSSC – High-side switch control input FSO – Function output

In pin control, the device’s watchdog and state changes are controlled by the device’s pins, and SPI communication is not available. In SPI control, the device’s watchdog and state changes are controlled by SPI communication.

Once the device has started up into either pin control or SPI control, it is not possible for the device to change control modes without a power-on reset. Consequently, each time a power-on reset occurs, the state of pin 7 determines whether the device starts up into pin control or SPI control.