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Thread: Dual TLV493D Sensor Help

  1. #1
    New Member New Member Uilnaydar is on a distinguished road
    Join Date
    Aug 2017

    Dual TLV493D Sensor Help

    I have dual TLV493D sensors I've been trying to get working. I've used multiple configurations
    • MSP430 + TLV493D on perfboard
    • ATMEGA (3.3V) + TLV493 on custom PCB
    • XMC1100 2go + TLV493 on 2nd custom PCB

    In each implementation I can get either of the two sensors to work on either of the two addresses but when I try to run the two concurrently one or the other addresses throw a NAK

    Click image for larger version

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    My most recent code is attached (using the Arduino IDE 1.0.3 board/libraries front-end provided by Infineon ):

    #include <MagneticSensor3D.h>
    #define SECONDARY_PIN 5               // P0.15
    void setup() {
      pinMode(SECONDARY_PIN, OUTPUT);     // Sensor #2 Power Pin
      digitalWrite(SECONDARY_PIN, LOW);   // Force Sensor #2 off
      Serial.println("Starting Sensor #1");
      Serial.println("Starting Sensor #2");
      digitalWrite(SECONDARY_PIN, HIGH);
      Serial.println("Setup complete");
    void loop() {
    I assume I have tunnel vision now if you folks can get me out of the tunnel I'd appreciate it.

    Thanks much and have a great weekend!

  2. #2
    Beginner Beginner
    Infineon Employee
    Infineon Employee
    berbra is on a distinguished road
    Join Date
    May 2017
    You are using dual TLV493D. You have set the ADDR/SDA of both devices on I2C correctly? On power-up the TLV interprets the applied voltage level on ADDR/SDA pin as logical “0” or “1”. This determines one of two possible I2C bus addresses to access the sensor. Check againg the schematics of the custom TLV boards. Compare them to figure 6 Application Circuit with external Power Supply and C in the datasheet and calculate the levels of SDA and SCL signals.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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