Linduino  1.3.0
Linear Technology Arduino-Compatible Demonstration Board

Linear Technology DC1011A-A Demonstration Board. More...

Detailed Description

Linear Technology DC1011A-A Demonstration Board.

LTC2498: 24-Bit, 16-Channel Delta Sigma ADC with SPI interface

NOTES
  Setup:
   Set the terminal baud rate to 115200 and select the newline terminator. Equipment
   required is a precision voltage source and a precision voltmeter. Additionally,
   an external power supply is required to provide a negative voltage for Amp V-.
   Set it to anywhere from -1V to -5V. Set Amp V+ to Vcc. Ensure the COM and REF-
   pins are connected to ground. The REF+ pin should be connected to +5V.

  How to test Single-Ended mode:
   The voltage source should be connected to the ADC such that the negative lead is
   connected to the COM(common) pin. The positive lead may be connected to any
   channel input. Ensure voltage is within analog input voltage range -0.3 to 2.5V.

  How to test Differential Mode:
   The voltage source should be connected with positive and negative leads to paired
   channels. The voltage source negative output must also be connected to the COM
   pin in order to provide a ground-referenced voltage. Ensure voltage is within
   analog input voltage range -0.3V to +2.5V. Swapping input voltages results in a
   reversed polarity reading.

  How to calibrate:
   Apply 100mV CH0 with respect to COM. Next, measure this voltage with a precise
   voltmeter and enter this value. (This takes the reading.) Now apply approximately
   2.40 volts to CH0. Measure this voltage with a precise voltmeter and enter this
   value. Calibration is now stored in EEPROM. Upon start-up 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/LTC2498

http://www.linear.com/product/LTC2498#demoboards

Copyright 2018(c) Analog Devices, Inc.

All rights reserved.

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

  • Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  • 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.
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THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, 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.

Definition in file DC1011AA.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 void print_user_command (uint8_t menu)
 Display selected differential channels. More...
 
static uint8_t menu_1_read_single_ended ()
 Read channels in single-ended mode. More...
 
static uint8_t menu_2_read_differential ()
 Read channels in differential mode. More...
 
static uint8_t menu_3_read_temperature ()
 Read Temperature. More...
 
static void menu_4_set_1X2X ()
 Set 1X or 2X mode. 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 uint8_t two_x_mode = LTC2498_SPEED_1X
 The LTC2498 2X Mode settings. More...
 
static uint8_t rejection_mode = LTC2498_R50_R60
 The LTC2498 rejection mode settings. More...
 
static float LTC2498_vref = 5.0
 The LTC2498 ideal reference voltage. More...
 
static uint16_t eoc_timeout = 250
 timeout in ms More...
 
const uint8_t BUILD_COMMAND_SINGLE_ENDED [16]
 Lookup table to build the command for single-ended mode. More...
 
const uint8_t BUILD_COMMAND_DIFF [16]
 Lookup table to build the command for differential mode. More...
 
const uint8_t BUILD_1X_2X_COMMAND [2] = {LTC2498_SPEED_1X, LTC2498_SPEED_2X}
 Lookup table to build 1X / 2X bits. More...
 

Function Documentation

◆ loop()

static void loop ( void  )
static

Repeats Linduino loop.

Definition at line 158 of file DC1011AA.ino.

◆ menu_1_read_single_ended()

static uint8_t menu_1_read_single_ended ( )
static

Read channels in single-ended mode.

Returns
Returns 0=successful, 1=unsuccessful (exceeded timeout)

Definition at line 282 of file DC1011AA.ino.

◆ menu_2_read_differential()

static uint8_t menu_2_read_differential ( )
static

Read channels in differential mode.

Returns
Returns 0=successful, 1=unsuccessful (exceeded timeout)

Definition at line 368 of file DC1011AA.ino.

◆ menu_3_read_temperature()

static uint8_t menu_3_read_temperature ( )
static

Read Temperature.

Returns
Returns 0=successful, 1=unsuccessful (exceeded timeout)

Definition at line 472 of file DC1011AA.ino.

◆ menu_4_set_1X2X()

static void menu_4_set_1X2X ( )
static

Set 1X or 2X mode.

Definition at line 505 of file DC1011AA.ino.

◆ print_prompt()

static void print_prompt ( )
static

Prints main menu.

Definition at line 213 of file DC1011AA.ino.

◆ print_title()

static void print_title ( void  )
static

Prints the title block when program first starts.

Definition at line 198 of file DC1011AA.ino.

◆ print_user_command()

static void print_user_command ( uint8_t  menu)
static

Display selected differential channels.

Displaying single-ended channels is straightforward; not so with differential because the inputs can take either polarity.

Definition at line 224 of file DC1011AA.ino.

◆ setup()

static void setup ( void  )
static

Initialize Linduino.

Definition at line 134 of file DC1011AA.ino.

Variable Documentation

◆ BUILD_1X_2X_COMMAND

const uint8_t BUILD_1X_2X_COMMAND[2] = {LTC2498_SPEED_1X, LTC2498_SPEED_2X}

Lookup table to build 1X / 2X bits.

Build the command for 1x or 2x mode

Definition at line 131 of file DC1011AA.ino.

◆ BUILD_COMMAND_DIFF

const uint8_t BUILD_COMMAND_DIFF[16]
Initial value:
}
#define LTC2498_P7_N6
Definition: LTC2498.h:168
#define LTC2498_P12_N13
Definition: LTC2498.h:176
#define LTC2498_P2_N3
Definition: LTC2498.h:161
#define LTC2498_P4_N5
Definition: LTC2498.h:164
#define LTC2498_P15_N14
Definition: LTC2498.h:180
#define LTC2498_P14_N15
Definition: LTC2498.h:179
#define LTC2498_P10_N11
Definition: LTC2498.h:173
#define LTC2498_P6_N7
Definition: LTC2498.h:167
#define LTC2498_P3_N2
Definition: LTC2498.h:162
#define LTC2498_P11_N10
Definition: LTC2498.h:174
#define LTC2498_P0_N1
Definition: LTC2498.h:158
#define LTC2498_P1_N0
Definition: LTC2498.h:159
#define LTC2498_P9_N8
Definition: LTC2498.h:171
#define LTC2498_P13_N12
Definition: LTC2498.h:177
#define LTC2498_P8_N9
Definition: LTC2498.h:170
#define LTC2498_P5_N4
Definition: LTC2498.h:165

Lookup table to build the command for differential mode.

Build the command for differential mode

Definition at line 124 of file DC1011AA.ino.

◆ BUILD_COMMAND_SINGLE_ENDED

const uint8_t BUILD_COMMAND_SINGLE_ENDED[16]
Initial value:
}
#define LTC2498_CH4
Definition: LTC2498.h:142
#define LTC2498_CH6
Definition: LTC2498.h:144
#define LTC2498_CH5
Definition: LTC2498.h:143
#define LTC2498_CH2
Definition: LTC2498.h:140
#define LTC2498_CH7
Definition: LTC2498.h:145
#define LTC2498_CH0
Definition: LTC2498.h:138
#define LTC2498_CH9
Definition: LTC2498.h:147
#define LTC2498_CH15
Definition: LTC2498.h:153
#define LTC2498_CH12
Definition: LTC2498.h:150
#define LTC2498_CH13
Definition: LTC2498.h:151
#define LTC2498_CH8
Definition: LTC2498.h:146
#define LTC2498_CH1
Definition: LTC2498.h:139
#define LTC2498_CH10
Definition: LTC2498.h:148
#define LTC2498_CH14
Definition: LTC2498.h:152
#define LTC2498_CH3
Definition: LTC2498.h:141
#define LTC2498_CH11
Definition: LTC2498.h:149

Lookup table to build the command for single-ended mode.

Builds the command for single-ended mode

Definition at line 117 of file DC1011AA.ino.

◆ demo_board_connected

uint8_t demo_board_connected
static

Set to 1 if the board is connected.

Definition at line 109 of file DC1011AA.ino.

◆ eoc_timeout

uint16_t eoc_timeout = 250
static

timeout in ms

Definition at line 113 of file DC1011AA.ino.

◆ LTC2498_vref

float LTC2498_vref = 5.0
static

The LTC2498 ideal reference voltage.

Definition at line 112 of file DC1011AA.ino.

◆ rejection_mode

uint8_t rejection_mode = LTC2498_R50_R60
static

The LTC2498 rejection mode settings.

Definition at line 111 of file DC1011AA.ino.

◆ two_x_mode

uint8_t two_x_mode = LTC2498_SPEED_1X
static

The LTC2498 2X Mode settings.

Definition at line 110 of file DC1011AA.ino.