Linduino  1.3.0
Linear Technology Arduino-Compatible Demonstration Board

Linear Technology DC1491A Demonstration Board. More...

Detailed Description

Linear Technology DC1491A Demonstration Board.

LTC2461: 16-Bit I2C Delta Sigma ADCs with 10ppm/C Max Precision Reference.

Linear Technology DC1493A Demonstration Board. LTC2463: Differential, 16-Bit I2C Delta Sigma ADCs with 10ppm/C Max Precision Reference.

Linear Technology DC1266A Demonstration Board. LTC2453: Differential, 16-Bit Delta Sigma ADC With I2C Interface

NOTES
  Setup:
   Set the terminal baud rate to 115200 and select the newline terminator. A voltage
   source (preferably low-noise) and a precision voltmeter are required. Ensure all
   jumpers on the demo board are installed in their default positions from the
   factory. Refer to Demo Manual DC1491A.
   * Run menu entry 4 if the voltage readings are not accurate. The DC1491A is not
     calibrated in the factory. Default values will be used until first customer
     calibration.
   If the voltage readings are in error, run menu entry 4 again. The previous
   calibration by the user may have been performed improperly.

  Menu Entry 1: Read ADC Voltage
   Ensure the applied voltage is within the analog input voltage range of 0V to
   +1.25V. Connect the voltage source between the DC1491A's IN terminal and GND
   terminal. This menu entry configures the LTC2461 to operate in 30 Hz mode.

  Menu Entry 2: Sleep Mode
   Enables sleep mode. Note that the REFOUT voltage will go to zero. Any
   subsequent read command will wake up the LTC2461.

  Menu Entry 3: 60 Hz Speed Mode
   Setup is the same as for Menu Entry 1, except the LTC2461 operates in 60 Hz mode,
   and continuous background offset calibration is not performed.

  Menu Entry 4: Calibration
   Follow the command cues to alternately enter voltages with VIN at GND and with
   VIN near full scale voltage, approximately 1.20V. Upon startup, the calibration
   values will be restored.

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

http://www.linear.com/product/LTC2461 http://www.linear.com/product/LTC2463 http://www.linear.com/product/LTC2453

http://www.linear.com/product/LTC2461#demoboards http://www.linear.com/product/LTC2463#demoboards http://www.linear.com/product/LTC2453#demoboards

Copyright 2018(c) Analog Devices, Inc.

All rights reserved.

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Definition in file DC1491A.ino.

Go to the source code of this file.

Functions

static void print_title ()
 Prints the title block when program first starts. More...
 
static void print_prompt ()
 Prints main menu. More...
 
static int8_t restore_calibration ()
 Read stored calibration parameters from nonvolatile EEPROM on demo board. More...
 
static void store_calibration ()
 Store measured calibration parameters to nonvolatile EEPROM on demo board. More...
 
static int8_t menu_1_read_30Hz_mode ()
 Read ADC in 30 Hz mode. More...
 
static int8_t menu_2_sleep_mode ()
 Sleep Mode. More...
 
static int8_t menu_3_read_60Hz_mode ()
 Read ADC in 60 Hz mode. More...
 
static int8_t menu_4_calibrate ()
 Calibrate the LTC2461. More...
 
static void setup ()
 Initialize Linduino. More...
 
static void loop ()
 Repeats Linduino loop. More...
 

Variables

static uint8_t demo_board_connected
 Set to 1 if the board is connected. More...
 
static float LTC2461_lsb = 1.907377E-05
 Ideal LSB voltage for a perfect part (Vref/(2^16)) More...
 
static int32_t LTC2461_offset_code = 0
 Ideal offset for a perfect part. More...
 

Function Documentation

◆ loop()

static void loop ( void  )
static

Repeats Linduino loop.

Definition at line 146 of file DC1491A.ino.

◆ menu_1_read_30Hz_mode()

static int8_t menu_1_read_30Hz_mode ( )
static

Read ADC in 30 Hz mode.

Returns
ACK bit (0=acknowledge, 1=no acknowledge)

Definition at line 261 of file DC1491A.ino.

◆ menu_2_sleep_mode()

static int8_t menu_2_sleep_mode ( )
static

Sleep Mode.

Returns
ACK bit (0=acknowledge, 1=no acknowledge)

Definition at line 290 of file DC1491A.ino.

◆ menu_3_read_60Hz_mode()

static int8_t menu_3_read_60Hz_mode ( )
static

Read ADC in 60 Hz mode.

Returns
ACK bit (0=acknowledge, 1=no acknowledge)

Definition at line 307 of file DC1491A.ino.

◆ menu_4_calibrate()

static int8_t menu_4_calibrate ( )
static

Calibrate the LTC2461.

Returns
ACK bit (0=acknowledge, 1=no acknowledge)

Definition at line 338 of file DC1491A.ino.

◆ print_prompt()

static void print_prompt ( )
static

Prints main menu.

Definition at line 213 of file DC1491A.ino.

◆ print_title()

static void print_title ( void  )
static

Prints the title block when program first starts.

Definition at line 197 of file DC1491A.ino.

◆ restore_calibration()

static int8_t restore_calibration ( )
static

Read stored calibration parameters from nonvolatile EEPROM on demo board.

Returns
Return 1 if successful, 0 if not

Definition at line 236 of file DC1491A.ino.

◆ setup()

static void setup ( void  )
static

Initialize Linduino.

Definition at line 128 of file DC1491A.ino.

◆ store_calibration()

static void store_calibration ( )
static

Store measured calibration parameters to nonvolatile EEPROM on demo board.

Definition at line 225 of file DC1491A.ino.

Variable Documentation

◆ demo_board_connected

uint8_t demo_board_connected
static

Set to 1 if the board is connected.

Definition at line 121 of file DC1491A.ino.

◆ LTC2461_lsb

float LTC2461_lsb = 1.907377E-05
static

Ideal LSB voltage for a perfect part (Vref/(2^16))

Definition at line 124 of file DC1491A.ino.

◆ LTC2461_offset_code

int32_t LTC2461_offset_code = 0
static

Ideal offset for a perfect part.

Definition at line 125 of file DC1491A.ino.