LTC2605 - Octal I²C 16-Bit Rail-to-Rail DACs in 16-Lead SSOP

/*!
Linear Technology DC935A Demonstration Board
LTC2605: Octal 16-/14-/12-Bit Rail-to Rail DACs in 16-Lead SSOP

@verbatim
NOTES
  Setup:
    Set the terminal baud rate to 115200 and select the newline terminator.
     The program displays calculated voltages which are based on the voltage
     of the reference used, be it internal or external. A precision voltmeter
     is needed to verify the actual measured voltages against the calculated
     voltage displayed. If an external reference is used, a precision voltage
     source is required to apply the external reference voltage. A precision
     voltmeter is also required to measure the external reference voltage.
     No external power supply is required. Any assembly option may be used:

  Explanation of Commands:
    1- Select DAC: Select one of four DACs to test: A, B, C, D.

     2- Write to DAC input register: Value is stored in the DAC for updating
      later, allowing multiple channels to be updated at once, either
      through a software "Update All" command or by asserting the LDAC# pin.
      User will be prompted to enter either a code in hex or decimal, or a
      voltage. If a voltage is entered, a code will be calculated based on
      the active scaling and reference parameters - ideal values if no
      calibration was ever stored.

     3- Write and Update: Similar to item 1, but DAC is updated immediately.

     4- Update DAC: Copies the value from the input register into the DAC
      Register. Note that a "write and update" command writes the code to
      BOTH the input register and DAC register, so subsequent "update" commands
      will simply re-copy the same data (no change in output).

     5- Power Down DAC: Disable DAC output. Power supply current is reduced. DAC
      code present in DAC registers at time of shutdown are preserved.

USER INPUT DATA FORMAT:
 decimal : 1024
 hex     : 0x400
 octal   : 02000  (leading 0 "zero")
 binary  : B10000000000
 float   : 1024.0

@endverbatim
http://ww.linear.com/product/LTC2605

http://www.linear.com/product/LTC2605#demoboards

REVISION HISTORY
$Revision: 5671 $
$Date: 2016-09-02 11:32:54 -0700 (Fri, 02 Sep 2016) $


Copyright (c) 2014, Linear Technology Corp.(LTC)
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied, of Linear Technology Corp.

The Linear Technology Linduino is not affiliated with the official Arduino team.
However, the Linduino is only possible because of the Arduino team's commitment
to the open-source community.  Please, visit http://www.arduino.cc and
http://store.arduino.cc , and consider a purchase that will help fund their
ongoing work.

*/
/*! @file
    @ingroup LTC2605
*/

#include <Arduino.h>
#include <stdint.h>
#include "Linduino.h"
#include "LT_SPI.h"
#include "UserInterface.h"
#include "LT_I2C.h"
#include "QuikEval_EEPROM.h"
#include "LTC2605.h"
#include <Wire.h>
#include <SPI.h>

// DAC Reference State
// Could have been 0 or 1. This allows you to use the
// variable "reference_mode" as the command argument to a write
#define REF_INTERNAL LTC2605_CMD_INTERNAL_REFERENCE   //!< Stored reference state is Internal
#define REF_EXTERNAL LTC2605_CMD_EXTERNAL_REFERENCE   //!< Stored reference state is External

//Function Declaration
void print_title();                         // Print the title block
void print_prompt(int16_t selected_dac);    // Prompt the user for an input command
int16_t prompt_voltage_or_code();
uint16_t get_voltage(float LTC2605_lsb, int16_t LTC2605_offset);
uint16_t get_code();
int8_t calibrate_dac(uint8_t index);        // Calibrate the selected DAC using a voltmeter. The routine does a linear curve fit given two data points.

int8_t menu_1_select_dac(int16_t *selected_dac);
int8_t menu_2_write_to_input_register(int16_t selected_dac);
int8_t menu_3_write_and_update_dac(int16_t selected_dac);
int8_t menu_4_update_power_up_dac(int16_t selected_dac);
int8_t menu_5_power_down_dac(int16_t selected_dac);

// Global variables
static uint8_t demo_board_connected;               //!< Set to 1 if the board is connected
static uint8_t shift_count = 0;                    //!< The data align shift count. For 16-bit=0, for 14 bits=2 for 12-bits=4
static uint8_t reference_mode = REF_INTERNAL;                     //!< Tells whether to set internal or external reference

// Global calibration variables
static float reference_voltage= 5;              //!< Reference voltage, either internal or external
static int16_t LTC2605_offset = 0;  //!< DAC offset
static float LTC2605_lsb = (reference_voltage / (pow(2,16) -1)); // least signifigant bit value of the dac

// Constants

//! Lookup table for DAC address. Allows the "All DACs" address to be indexed right after DAC D in loops.
//! This technique is very useful for devices with non-monotonic channel addresses.
const uint8_t address_map[9] = {LTC2605_DAC_A, LTC2605_DAC_B, LTC2605_DAC_C, LTC2605_DAC_D, LTC2605_DAC_E, LTC2605_DAC_F , LTC2605_DAC_G, LTC2605_DAC_H, LTC2605_DAC_ALL};  //!< Map entered option 0..2 to DAC address

//! Used to keep track to print voltage or print code
enum
{
  PROMPT_VOLTAGE = 0, /**< 0 */
  PROMPT_CODE = 1     /**< 1 */
};

//! Initialize Linduino
void setup()
// Setup the program
{
  quikeval_I2C_init();              // Configure the EEPROM I2C port for 100khz
  quikeval_I2C_connect();           // Connect I2C to main data port
  Serial.begin(115200);
  print_title();
  //if(demo_board_connected)
  demo_board_connected = true;
  print_prompt(0);
  LTC2605_write(LTC2605_I2C_ADDRESS, LTC2605_CMD_NO_OPERATION, LTC2605_DAC_ALL, 0x0000);
  Serial.flush();
}

//! Repeats Linduino loop
void loop()
{
  int8_t ack =0;
  int16_t user_command;
  static int16_t selected_dac =0; // The selected DAC to be updated (0=A, 1=B ... 9=All).  Initialized to "A"
  // the main control loop
  if (demo_board_connected) // do nothing if board is not connected
  {
    if (Serial.available()) // check for user input
    {
      user_command = read_int();
      Serial.println(user_command);
      Serial.flush();
      ack =0;
      switch (user_command)
      {
        case 1:
          ack |= menu_1_select_dac(&selected_dac);
          break;
        case 2:
          ack |= menu_2_write_to_input_register(selected_dac);
          break;
        case 3:
          ack |= menu_3_write_and_update_dac(selected_dac);
          break;
        case 4:
          ack |= menu_4_update_power_up_dac(selected_dac);
          break;
        case 5:
          ack |= menu_5_power_down_dac(selected_dac);
          break;
        default:
          Serial.println("Incorrect Option");
          break;
      }
      if (ack)Serial.println("I2C NACK received, check address\n");
      Serial.println("\n*****************************************************************");
      print_prompt(selected_dac);
    }
  }
}

// Function Definitions

//! Select which DAC to operate on
//! @return 0
int8_t menu_1_select_dac(int16_t *selected_dac) //!< what DAC to operate on
{
  // Select a DAC to operate on
  Serial.print("Select DAC to operate on (0=A, 1=B, 2=C, 3=D, 4=E, 5=F, 6=G, 7=H, 8=All)");
  *selected_dac = read_int();
  if (*selected_dac == 8)
    Serial.println("All");
  else
    Serial.println(*selected_dac);
  return(0);
}

//! Write data to input register, but do not update DAC output
//! @return ACK bit (0=acknowledge, 1=no acknowledge)
int8_t menu_2_write_to_input_register(int16_t selected_dac) //!< what DAC to operate on
{
  int8_t ack=0;
  uint16_t dac_code;

  if (prompt_voltage_or_code() == PROMPT_VOLTAGE)
    dac_code = get_voltage(LTC2605_lsb, LTC2605_offset);
  else
    dac_code = get_code();

  Serial.print("DAC code transmitted: 0x");
  Serial.println(dac_code,HEX);

  ack |= LTC2605_write(LTC2605_I2C_ADDRESS, LTC2605_CMD_WRITE, address_map[selected_dac], dac_code << shift_count);
  return (ack);
}
//!Write data to DAC register (which updates output immediately)
//! @return ACK bit (0=acknowledge, 1=no acknowledge)
int8_t menu_3_write_and_update_dac(int16_t selected_dac) //!< what DAC to operate on
{
  int8_t ack=0;
  uint16_t dac_code;

  if (prompt_voltage_or_code() == PROMPT_VOLTAGE)
    dac_code = get_voltage(LTC2605_lsb, LTC2605_offset);
  else
    dac_code = get_code();
  //Serial.print("lsb:");
  //Serial.println(LTC2605_lsb);
  Serial.print("DAC code transmitted: 0x");
  Serial.println(dac_code,HEX);


  ack |= LTC2605_write(LTC2605_I2C_ADDRESS, LTC2605_CMD_WRITE_UPDATE, address_map[selected_dac], dac_code << shift_count);
  return (ack);
}

//! Update DAC with data that is stored in input register, power up if sleeping
//! @return ACK bit (0=acknowledge, 1=no acknowledge)
int8_t menu_4_update_power_up_dac(int16_t selected_dac) //!< what DAC to operate on
{
  // Update DAC
  int8_t ack=0;
  ack |= LTC2605_write(LTC2605_I2C_ADDRESS, LTC2605_CMD_UPDATE, address_map[selected_dac], 0x0000);
  return (ack);
}

//! Power down DAC
//! @return ACK bit (0=acknowledge, 1=no acknowledge)
int8_t menu_5_power_down_dac(int16_t selected_dac) //!< what DAC to operate on
{
  // Power down DAC
  int8_t ack=0;
  ack |= LTC2605_write(LTC2605_I2C_ADDRESS, LTC2605_CMD_POWER_DOWN, address_map[selected_dac], 0x0000);
  return (ack);
}


//! Prompt user to enter a voltage or digital code to send to DAC
//! @return prompt type
int16_t prompt_voltage_or_code()
{
  int16_t user_input;
  Serial.print(F("Type 1 to enter voltage, 2 to enter code:"));
  Serial.flush();
  user_input = read_int();
  Serial.println(user_input);

  if (user_input != 2)
    return(PROMPT_VOLTAGE);
  else
    return(PROMPT_CODE);
}
//! Get voltage from user input, calculate DAC code based on lsb, offset
//! @return voltage
uint16_t get_voltage(float LTC2605_lsb, //!< the voltage LSB of the DAC
                     int16_t LTC2605_offset) //!< the Offset of the DAC
{
  float dac_voltage;

  Serial.print(F("Enter Desired DAC output voltage: "));
  dac_voltage = read_float();
  Serial.print(dac_voltage);
  Serial.println(" V");
  Serial.flush();
  return(LTC2605_voltage_to_code(dac_voltage, LTC2605_lsb, LTC2605_offset));
}

//! Get code to send to DAC directly, in decimal, hex, or binary
//! @return DAC code
uint16_t get_code()
{
  uint16_t returncode;
  Serial.println("Enter Desired DAC Code");
  Serial.print("(Format 32768, 0x8000, 0100000, or B1000000000000000): ");
  returncode = (uint16_t) read_int();
  Serial.print("0x");
  Serial.println(returncode, HEX);
  Serial.print("code corresponding to voltage: ");
  Serial.print(LTC2605_code_to_voltage( returncode, LTC2605_lsb,LTC2605_offset));
  Serial.println(" V");
  Serial.flush();
  return(returncode);
}

//! Prints the title block when program first starts.
void print_title()
{
  Serial.println("");
  Serial.println(F("*****************************************************************"));
  Serial.println(F("* DC935 Demonstration Program                                   *"));
  Serial.println(F("*                                                               *"));
  Serial.println(F("* This program demonstrates how to send data to the LTC2605     *"));
  Serial.println(F("* octo 16/14/12-bit DAC found on the DC935 demo board.          *"));
  Serial.println(F("*                                                               *"));
  Serial.println(F("* Set the baud rate to 115200 and select the newline terminator.*"));
  Serial.println(F("*                                                               *"));
  Serial.println(F("*****************************************************************"));
}

//! Prints main menu.
void print_prompt(int16_t selected_dac) //!< what DAC to operate on
{
  Serial.println(F("\nCommand Summary:"));
  Serial.println(F("  1-Select DAC"));
  Serial.println(F("  2-Write to input register (no update)"));
  Serial.println(F("  3-Write and update DAC"));
  Serial.println(F("  4-Update / power up DAC"));
  Serial.println(F("  5-Power down DAC"));


  Serial.println("\nPresent Values:");
  Serial.print("  Selected DAC: ");
  if (selected_dac != 4)
    Serial.println((char) (selected_dac + 0x41));
  else
    Serial.println("All");
  //Serial.print("  DAC Code: 0x");
  // Serial.println(code[selected_dac], HEX);
  // Serial.print("  Calculated DAC Output Voltage = ");
  // Serial.print(voltage, 4);
  // Serial.println(" V");
  Serial.print("  DAC Reference: ");
  if (reference_mode == REF_INTERNAL)
    Serial.println("Internal");
  else
  {
    Serial.print(F("External "));
    Serial.print(reference_voltage, 5);
    Serial.println(F("V reference, please verify"));
    Serial.print(F("Enter a command:"));

  }
  Serial.flush();
}

/*!
LTC2605: Octal 16-/14-/12-Bit Rail-to Rail DACs in 16-Lead SSOP

@verbatim

The LTC2605/LTC2615/LTC2625 are octal 16-, 14- and 12-bit, 2.7V to 5.5V
rail-to-rail voltage-output DACs in 16-lead narrow SSOP packages. They have
built-in high performance output buffers and are guaranteed monotonic.

These parts establish new board-density benchmarks for 16-/14-bit DACs and
advance performance standards for output drive, crosstalk and load regulation
in single supply, voltage-output multiples.


@endverbatim


http://www.linear.com/product/LTC2605

http://www.linear.com/product/LTC2605#demoboards

REVISION HISTORY
$Revision: 5671 $
$Date: 2016-09-02 11:32:54 -0700 (Fri, 02 Sep 2016) $


Copyright (c) 2014, Linear Technology Corp.(LTC)
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied, of Linear Technology Corp.

The Linear Technology Linduino is not affiliated with the official Arduino team.
However, the Linduino is only possible because of the Arduino team's commitment
to the open-source community.  Please, visit http://www.arduino.cc and
http://store.arduino.cc , and consider a purchase that will help fund their
ongoing work.
*/

//! @defgroup LTC2605 LTC2605: Octal 16-/14-/12-Bit Rail-to Rail DACs in 16-Lead SSOP

/*! @file
  @ingroup LTC2605
  Library for LTC2605: Octal 16-/14-/12-Bit Rail-to Rail DACs in 16-Lead SSOP
*/
#include <Arduino.h>
#include <stdint.h>
#include <math.h>
#include "Linduino.h"
#include "LT_I2C.h"
#include "LTC2605.h"

// Write the dac_command byte and 16-bit dac_code to the LTC2605.
// The function returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
int8_t LTC2605_write(uint8_t i2c_address, uint8_t dac_command, uint8_t dac_address, uint16_t dac_code)
{
  int8_t ack;

  ack = i2c_write_word_data(i2c_address, dac_command | dac_address, dac_code);
  return(ack);
}

// Calculate a LTC26505 DAC code given the desired output voltage and DAC address (0-3)
uint16_t LTC2605_voltage_to_code(float dac_voltage, float LTC2605_lsb, int16_t LTC2605_offset)
{
  int32_t dac_code;
  float float_code;
  float_code = dac_voltage / LTC2605_lsb;                                                             //! 1) Calculate the DAC code
  float_code = (float_code > (floor(float_code) + 0.5)) ? ceil(float_code) : floor(float_code);       //! 2) Round
  dac_code = (int32_t)float_code - LTC2605_offset;                                                    //! 3) Subtract offset
  if (dac_code < 0)                                                                                   //! 4) If DAC code < 0, Then DAC code = 0
    dac_code = 0;
  return ((uint16_t)dac_code);                                                                        //! 5) Cast DAC code as uint16_t
}

// Calculate the LTC2605 DAC output voltage given the DAC code and DAC address (0-3)
float LTC2605_code_to_voltage(uint16_t dac_code, float LTC2605_lsb, int16_t LTC2605_offset)
{
  float dac_voltage;
  dac_voltage = ((float)(dac_code + LTC2605_offset)* LTC2605_lsb);                                    //! 1) Calculates the dac_voltage
  return (dac_voltage);
}

/*!
LTC2605: Octal 16-/14-/12-Bit Rail-to Rail DACs in 16-Lead SSOP

@verbatim

The LTC2605/LTC2615/LTC2625 are octal 16-, 14- and 12-bit, 2.7V to 5.5V
rail-to-rail voltage-output DACs in 16-lead narrow SSOP packages. They have
built-in high performance output buffers and are guaranteed monotonic.

These parts establish new board-density benchmarks for 16-/14-bit DACs and
advance performance standards for output drive, crosstalk and load regulation
in single supply, voltage-output multiples.


I2C DATA FORMAT (MSB First):

                    Byte #1                             Byte #2
                    MSB
LTC2655-16 : START  SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK  C3 C2 C1 C0 A3 A2 A1 A0 SACK
LTC2655-12 : START  SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK  C3 C2 C1 C0 A3 A2 A1 A0 SACK


Byte #3                             Byte #4
                                    LSB
D15 D14 D13 D12 D11 D10 D9 D8 SACK  D7 D6 D5 D4 D3 D2 D1 D0 SACK  STOP
D11 D10 D9  D8  D7  D6  D5 D4 SACK  D3 D2 D1 D0 X  X  X  X  SACK  STOP

START: I2C Start
SAx  : I2C Address
W    : I2C Write (0)
SACK : I2C Slave Generated Acknowledge (Active Low)
Cx   : DAC Command Code
Ax   : DAC Address (0=DACA, 1=DACB, 2=DACC, 3=DACD, 0xFF=All DACs)
Dx   : DAC Data Bits
X    : Don't care
STOP : I2C Stop


Example Code:

Set DAC A to to 2V for 16-bit DAC.

    shift_count = 0;    // 16-bit DAC does not have to be shifted
    dac_voltage = 2.0;  // Sets dac voltage variable to 2v

    dac_code = LTC2605_voltage_to_code(dac_voltage, LTC2605_lsb, LTC2605_offset);   // Calculate DAC code from voltage, lsb, and offset
    ack = LTC2655_write(LTC2605_I2C_ADDRESS, LTC2605_CMD_WRITE_UPDATE, LTC2605_DAC_A, dac_code);    // Set DAC A with DAC code

@endverbatim


http://www.linear.com/product/LTC2605

http://www.linear.com/product/LTC2605#demoboards

REVISION HISTORY
$Revision: 5671 $
$Date: 2016-09-02 11:32:54 -0700 (Fri, 02 Sep 2016) $



Copyright (c) 2014, Linear Technology Corp.(LTC)
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied, of Linear Technology Corp.

The Linear Technology Linduino is not affiliated with the official Arduino team.
However, the Linduino is only possible because of the Arduino team's commitment
to the open-source community.  Please, visit http://www.arduino.cc and
http://store.arduino.cc , and consider a purchase that will help fund their
ongoing work.
*/
/*! @file
  @ingroup LTC2605
  Header for LTC2605: Octal 16-/14-/12-Bit Rail-to Rail DACs in 16-Lead SSOP
*/

#ifndef LTC2605_H
#define LTC2605_H

#include <Wire.h>
//!Use table to select address
/*!
|LTC2604 I2C Address Assignment| Value  |  AD2       | AD1     | AD0      |
| :--------------------------: | :------: | :------: |:------: | :------: |
|  LTC2605_I2C_ADDRESS         |  0x10    |  GND     |   GND   |   GND    |
|  LTC2605_I2C_ADDRESS         |  0x11    |  GND     |   GND   |   Float  |
|  LTC2605_I2C_ADDRESS         |  0x12    |  GND     |   GND   |   Vcc    |
|  LTC2605_I2C_ADDRESS         |  0x13    |  GND     |   Float |   GND    |
|  LTC2605_I2C_ADDRESS         |  0x20    |  GND     |   Float |   Float  |
|  LTC2605_I2C_ADDRESS         |  0x21    |  GND     |   Float |   Vcc    |
|  LTC2605_I2C_ADDRESS         |  0x22    |  GND     |   Vcc   |   GND    |
|  LTC2605_I2C_ADDRESS         |  0x23    |  GND     |   Vcc   |   Float  |
|  LTC2605_I2C_ADDRESS         |  0x30    |  GND     |   Vcc   |   Vcc    |
|  LTC2605_I2C_ADDRESS         |  0x31    |  Float   |   GND   |   GND    |
|  LTC2605_I2C_ADDRESS         |  0x32    |  Float   |   GND   |   Float  |
|  LTC2605_I2C_ADDRESS         |  0x33    |  Float   |   GND   |   Vcc    |
|  LTC2605_I2C_ADDRESS         |  0x40    |  Float   |   Float |   GND    |
|  LTC2605_I2C_ADDRESS         |  0x41    |  Float   |   Float |   Float  |
|  LTC2605_I2C_ADDRESS         |  0x42    |  Float   |   Float |   Vcc    |
|  LTC2605_I2C_ADDRESS         |  0x43    |  Float   |   Vcc   |   GND    |
|  LTC2605_I2C_ADDRESS         |  0x50    |  Float   |   Vcc   |   Float  |
|  LTC2605_I2C_ADDRESS         |  0x51    |  Float   |   Vcc   |   Vcc    |
|  LTC2605_I2C_ADDRESS         |  0x52    |  Vcc     |   GND   |   GND    |
|  LTC2605_I2C_ADDRESS         |  0x53    |  Vcc     |   GND   |   Float  |
|  LTC2605_I2C_ADDRESS         |  0x60    |  Vcc     |   GND   |   Vcc    |
|  LTC2605_I2C_ADDRESS         |  0x61    |  Vcc     |   Float |   GND    |
|  LTC2605_I2C_ADDRESS         |  0x62    |  Vcc     |   Float |   Float  |
|  LTC2605_I2C_ADDRESS         |  0x63    |  Vcc     |   Float |   Vcc    |
|  LTC2605_I2C_ADDRESS         |  0x70    |  Vcc     |   Vcc   |   GND    |
|  LTC2605_I2C_ADDRESS         |  0x71    |  Vcc     |   Vcc   |   Float  |
|  LTC2605_I2C_ADDRESS         |  0x72    |  Vcc     |   Vcc   |   Vcc    |
| LTC2605_I2C_GLOBAL_ADDRESS   |  0x73    |    X     |    X    |    X     |
*/
/*! @name LTC2604 Address Assignments
@{ */

// I2C Address Choices:
// To choose an address, comment out all options except the
// configuration on the demo board.

//  Address assignment
// LTC2605 I2C Address                //  AD2       AD1       AD0
// #define LTC2605_I2C_ADDRESS 0x10      //  GND       GND       GND
// #define LTC2605_I2C_ADDRESS 0x11    //  GND       GND       Float
// #define LTC2605_I2C_ADDRESS 0x12    //  GND       GND       Vcc
// #define LTC2605_I2C_ADDRESS 0x13    //  GND       Float     GND
// #define LTC2605_I2C_ADDRESS 0x20    //  GND       Float     Float
// #define LTC2605_I2C_ADDRESS 0x21    //  GND       Float     Vcc
// #define LTC2605_I2C_ADDRESS 0x22    //  GND       Vcc       GND
// #define LTC2605_I2C_ADDRESS 0x23    //  GND       Vcc       Float
// #define LTC2605_I2C_ADDRESS 0x30    //  GND       Vcc       Vcc
// #define LTC2605_I2C_ADDRESS 0x31    //  Float     GND       GND
// #define LTC2605_I2C_ADDRESS 0x32    //  Float     GND       Float
// #define LTC2605_I2C_ADDRESS 0x33    //  Float     GND       Vcc
// #define LTC2605_I2C_ADDRESS 0x40    //  Float     Float     GND
// #define LTC2605_I2C_ADDRESS 0x41    //  Float     Float     Float
// #define LTC2605_I2C_ADDRESS 0x42    //  Float     Float     Vcc
// #define LTC2605_I2C_ADDRESS 0x43    //  Float     Vcc       GND
// #define LTC2605_I2C_ADDRESS 0x50    //  Float     Vcc       Float
// #define LTC2605_I2C_ADDRESS 0x51    //  Float     Vcc       Vcc
// #define LTC2605_I2C_ADDRESS 0x52    //  Vcc       GND       GND
// #define LTC2605_I2C_ADDRESS 0x53    //  Vcc       GND       Float
// #define LTC2605_I2C_ADDRESS 0x60    //  Vcc       GND       Vcc
// #define LTC2605_I2C_ADDRESS 0x61    //  Vcc       Float     GND
// #define LTC2605_I2C_ADDRESS 0x62    //  Vcc       Float     Float
// #define LTC2605_I2C_ADDRESS 0x63    //  Vcc       Float     Vcc
// #define LTC2605_I2C_ADDRESS 0x70    //  Vcc       Vcc       GND
// #define LTC2605_I2C_ADDRESS 0x71    //  Vcc       Vcc       Float
#define LTC2605_I2C_ADDRESS 0x72    //  Vcc       Vcc       Vcc
//#define LTC2605_I2C_GLOBAL_ADDRESS  0x73






//! @name LTC2655 Command Codes
//! @{
//! OR'd together with the DAC address to form the command byte
#define  LTC2605_CMD_WRITE               0x00   //!< Write to input register n
#define  LTC2605_CMD_UPDATE              0x10   //!< Update (power up) DAC register n
#define  LTC2605_CMD_WRITE_UPDATE        0x30   //!< Write to input register n, update (power up) all 
#define  LTC2605_CMD_POWER_DOWN          0x40   //!< Power down n
#define  LTC2605_CMD_POWER_DOWN_ALL      0x50   //!< Power down chip (all DACs and reference)
#define  LTC2605_CMD_INTERNAL_REFERENCE  0x60   //!< Select internal reference (power up reference)
#define  LTC2605_CMD_EXTERNAL_REFERENCE  0x70   //!< Select external reference (power down internal reference)
#define  LTC2605_CMD_NO_OPERATION        0xF0   //!< No operation
//! @}

/*!
| DAC Addresses                | Value    |
| :--------------------------: | :------: |
|  LTC2605_DAC_A               |  0x00    |
|  LTC2605_DAC_B               |  0x01    |
|  LTC2605_DAC_C               |  0x02    |
|  LTC2605_DAC_D               |  0x03    |
|  LTC2605_DAC_E               |  0x04    |
|  LTC2605_DAC_F               |  0x05    |
|  LTC2605_DAC_G               |  0x06    |
|  LTC2605_DAC_H               |  0x07    |
|  LTC2605_DAC_ALL             |  0x0F    |
*/
/*! @name Dac Addresses
@{*/

// Which DAC to operate on
#define  LTC2605_DAC_A     0x00
#define  LTC2605_DAC_B     0x01
#define  LTC2605_DAC_C     0x02
#define  LTC2605_DAC_D     0x03
#define  LTC2605_DAC_E     0x04
#define  LTC2605_DAC_F     0x05
#define  LTC2605_DAC_G     0x06
#define  LTC2605_DAC_H     0x07
#define  LTC2605_DAC_ALL   0x0F


//! Write a 16-bit dac_code to the LTC2605.
//! @return ACK bit (0=acknowledge, 1=no acknowledge)
int8_t  LTC2605_write(uint8_t  i2c_address,                   //!< I2C address of DAC
                      uint8_t  dac_command,                   //!< Command Nibble, left-justified, lower nibble set to zero
                      uint8_t  dac_address,                   //!< DAC Address Nibble, right justified, upper nibble set to zero
                      uint16_t dac_code                       //!< 16-bit DAC code
                     );

//! Calculate a LTC2605 DAC code given the desired output voltage
//! @return The 16-bit code to send to the DAC
uint16_t LTC2605_voltage_to_code(float dac_voltage,       //!< Voltage to send to DAC
                                 float LTC2605_lsb,       //!< LSB value
                                 int16_t LTC2605_offset   //!< Offset
                                );

//! Calculate the LTC2605 DAC output voltage given the DAC code, offset, and LSB value
//! @return Calculated voltage
float LTC2605_code_to_voltage(uint16_t dac_code,          //!< DAC code
                              float LTC2605_lsb,          //!< LSB value
                              int16_t LTC2605_offset      //!< Offset
                             );

#endif //LTC2605_H