SLLU326A May   2022  – June 2022 TLIN1431-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Features
    2. 1.2 Description
  4. 2EVM Setup and Features
    1. 2.1  Startup Mode Configurations
      1. 2.1.1 Pin and SPI Modes
      2. 2.1.2 Wake Request (WKRQ) vs. Inhibit Output (INH)
    2. 2.2  Commander and Responder Configurations
    3. 2.3  Local Wake-Up
    4. 2.4  Channel Expansion
    5. 2.5  VBAT Voltage Divider
    6. 2.6  Reset Input
    7. 2.7  Logic-Level LIMP and WAKE Signals
    8. 2.8  High-Voltage Signal Monitoring
    9. 2.9  TXD and RXD
    10. 2.10 VCC Load Testing
    11. 2.11 SPI Interface
  5. 3Jumpers, Headers, Connectors, Test Points, and Switches
  6. 4Bill of Materials
  7. 5Schematic

2.1.2 Wake Request (WKRQ) vs. Inhibit Output (INH)

The WKRQ/INH pin has the capability of operating as either a logic-level wake request (WKRQ) digital output, or a high-voltage inhibit (INH) output based upon its biasing at startup. Applying a 100 kΩ or stronger pull-down to GND on this pin results in the pin behaving as logic-level WKRQ. Alternatively, leaving this pin floating or applying a 1 MΩ pull-down to GND results in the pin behaving as high-voltage INH.

Figure 2-2 WKRQ or INH Pin Select

The user can configure this pin as WKRQ by connecting a shunt between pins “U1.16” and “WKRQ” of J2 to apply a 100 kΩ pull-down. Alternatively, the user can configure the WKRQ/INH pin as high-voltage INH by connecting a shunt between pins “U1.16” and “INH” of J2 at power-up to apply a 1 MΩ pull-down, or by leaving all of these pins floating. In addition, capacitor pad C29 allows for the user to test a capacitor in parallel with the 1 MΩ resistor in order to evaluate the behavior of this pin at startup.