DAC53701: Generating medical Audio and visual alarm

Hi Deepak,

A circuit is given for the audio medical alarm generation in section 9.2.3 of the DAC53701 datasheet. It uses 2 DAC53701s to create the medical alarm and a pulse frequency.  

Where were you running into trouble? I will check and see if we also have a visual medical alarm circuit available. The I2C code would be as follows:

#define I2C_ADDR_DAC1 0x48

#define I2C_ADDR_DAC2 0x49

#define I2C_ADDR_BROADCAST 0x47

//Set up I2C address for DAC1 and DAC2

//Set GPI pins to 0 for both devices

//Set GPI_CONFIG in the CONFIG2 register to 111b

Wire.beginTransmission(I2C_ADDR_BROADCAST);
Wire.write(byte(0xD2)); // CONFIG2 Register
Wire.write(byte(0x31)); // Set GPIO_CONFIG to 0b111
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting

// Set GPI_EN in the TRIGGER register to 1b

Wire.beginTransmission(I2C_ADDR_BROADCAST);
Wire.write(byte(0xD3)); // TRIGGER Register
Wire.write(byte(0x04)); // Set GPIO_EN to 0b1
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting

//Set the GPI pin to logic HIGH for the device that needs to be configured (DAC2)

//Write data to SLAVE_ADDRESS bit field in the CONFIG2 register. Only the device with GPI pin logic HIGH updates the SLAVE_ADDRESS setting passed in the command. Make sure that the rest of the devices on the same I2C bus have their respective GPI pins set to logic LOW during this process.

Wire.beginTransmission(I2C_ADDR_BROADCAST);
Wire.write(byte(0xD2)); // CONFIG2 Register
Wire.write(byte(0x40)); // Set SLAVE_ADDRESS to 0b01
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting

//Toggle the GPI pin of the device bring programmed to logic LOW

//Set GPI_EN to 0b

Wire.beginTransmission(I2C_ADDR_BROADCAST);
Wire.write(byte(0xD3)); // TRIGGER Register
Wire.write(byte(0x00)); // Set GPIO_EN to 0b0
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting

// Change GPI_CONFIG to 000b

Wire.beginTransmission(I2C_ADDR_BROADCAST);
Wire.write(byte(0xD2)); // CONFIG2 Register
Wire.write(byte(0x00)); // Set GPIO_CONFIG to 0b000
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting 

//Trigger NVM write operation.

Wire.beginTransmission(I2C_ADDR_BROADCAST);
Wire.write(byte(0xD3)); // TRIGGER Register
Wire.write(byte(0x00)); // 
Wire.write(byte(0x10)); // Set NVM_PROG to 0b1
Wire.endTransmission(); // stop transmitting 

//Power-up DAC1, enable VDD reference, SLEW_RATE: 1.6384 ms (Square wave frequency: 610 Hz)

Wire.beginTransmission(I2C_ADDR_DAC1);
Wire.write(byte(0xD1)); // GENERAL_CONFIG Register
Wire.write(byte(0xC1)); // 
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting

//Set MARGIN_HIGH on DAC1

Wire.beginTransmission(I2C_ADDR_DAC1);
Wire.write(byte(0x25)); // DAC_MARGIN_HIGH Register
Wire.write(byte(0x0F)); // 
Wire.write(byte(0xFC)); // 
Wire.endTransmission(); // stop transmitting

  
//Set MARGIN_LOW on DAC1

Wire.beginTransmission(I2C_ADDR_DAC1);
Wire.write(byte(0x26)); // DAC_MARGIN_LOW Register
Wire.write(byte(0x00)); // 
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting

  
//Set DAC1 GPIO to trigger square wave

Wire.beginTransmission(I2C_ADDR_DAC1);
Wire.write(byte(0xD2)); // CONFIG2 Register
Wire.write(byte(0x18)); // Set GPIO_CONFIG to 0b011
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting

  
//Power-up DAC2, enable VDD reference
//CODE_STEP: 8 LSB, SLEW_RATE: 204.8 µs x 1.75 = 358.4 µs (Envelope rise/fall times for full-scale:~26 ms)

Wire.beginTransmission(I2C_ADDR_DAC2);
Wire.write(byte(0xD1)); // GENERAL_CONFIG Register
Wire.write(byte(0x0A)); // 
Wire.write(byte(0x80)); // 
Wire.endTransmission(); // stop transmitting

  
//OPTION-1: Configure DAC2 GPIO to trigger low-priority alarm with minimum time settings and trigger

//Set GPI_CONFIG in the CONFIG2 register to 111b

Wire.beginTransmission(I2C_ADDR_DAC2);
Wire.write(byte(0xD2)); // CONFIG2 Register
Wire.write(byte(0x30)); // Set GPIO_CONFIG to 0b110
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting

  
//OPTION-2: Configure DAC2 GPIO to trigger medium-priority alarm with minimum time settings and trigger
Wire.beginTransmission(I2C_ADDR_DAC2);
Wire.write(byte(0xD2)); // CONFIG2 Register
Wire.write(byte(0x28)); // Set GPIO_CONFIG to 0b101
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting

  
//OPTION-3: Configure DAC2 GPIO to trigger high-priority alarm with minimum time settings and trigger
Wire.beginTransmission(I2C_ADDR_DAC2);
Wire.write(byte(0xD2)); // CONFIG2 Register
Wire.write(byte(0x20)); // Set GPIO_CONFIG to 0b100
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting

  
//Set MARGIN_HIGH on DAC2

Wire.beginTransmission(I2C_ADDR_DAC2);
Wire.write(byte(0x25)); // DAC_MARGIN_HIGH Register
Wire.write(byte(0x0F)); // 
Wire.write(byte(0xFC)); // 
Wire.endTransmission(); // stop transmitting

  
//Set MARGIN_LOW on DAC2
Wire.beginTransmission(I2C_ADDR_DAC2);
Wire.write(byte(0x26)); // DAC_MARGIN_LOW Register
Wire.write(byte(0x00)); // 
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting

// Set GPI_EN in the TRIGGER register to 1b

Wire.beginTransmission(I2C_ADDR_BROADCAST);
Wire.write(byte(0xD3)); // TRIGGER Register
Wire.write(byte(0x04)); // Set GPIO_EN to 0b1
Wire.write(byte(0x00)); // 
Wire.endTransmission(); // stop transmitting

//Trigger NVM write operation.

Wire.beginTransmission(I2C_ADDR_BROADCAST);
Wire.write(byte(0xD3)); // TRIGGER Register
Wire.write(byte(0x00)); // 
Wire.write(byte(0x10)); // Set NVM_PROG to 0b1
Wire.endTransmission(); // stop transmitting 

Hi Katlynne,

Thanks for the reply.

Yes it is giving 610Hz Square wave and LOW,MED,High priority alarm.

One more question, does medical alarm only compose of only 1 frequency?

Thanks for the reply,

How can I change 

1. INTERBURST_TIME 

2. PULSE_OFF_TIME

3. PULSE_ON_TIME