Dual TLV493D Sensor Help

[#1]

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



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

#include 
#define SECONDARY_PIN 5               // P0.15

void setup() {
  Serial.begin(9600);
  while(!Serial);
  
  delay(2000);
  Serial.println("Initialization...");
  delay(500);
  
  pinMode(SECONDARY_PIN, OUTPUT);     // Sensor #2 Power Pin
  digitalWrite(SECONDARY_PIN, LOW);   // Force Sensor #2 off

  Serial.println("Starting Sensor #1");
  magnetic3dSensor_primary.begin();
  delay(100);

  Serial.println("Starting Sensor #2");
  digitalWrite(SECONDARY_PIN, HIGH);
  delay(10);
  magnetic3dSensor_secondary.begin();

  Serial.println("Setup complete");
}

void loop() {
  magnetic3dSensor_primary.updateData();
  delay(100);
  magnetic3dSensor_secondary.updateData();
  delay(100);

}

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!
Uily

[User13282]

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 µC in the datasheet and calculate the levels of SDA and SCL signals.