| Linduino 1.3.0 Linear Technology Arduino-Compatible Demonstration Board

Functions | Variables
DC1186A.ino File Reference
Analog-to-Digital Converters (ADC) » LTC2308: 12-Bit 8-Channel 200ksps ADC

Linear Technology DC1186A Demonstration Board. More...

## Detailed Description

Linear Technology DC1186A Demonstration Board.

LTC2308: 12-Bit, 8-Channel 500ksps SAR ADC with SPI Interface.

    NOTES
      Setup:
       Set the terminal baud rate to 115200 and select the newline terminator. Equipment
       required is a voltage source (preferably low-noise) and a precision voltmeter. No
       external power supply is required. Ensure all jumpers on the demo board are
       installed in their default positions from the factory. Refer to Demo Manual
       DC1186A.

      How to test Single-Ended mode:
       Bipolar Mode:
        The voltage source should be connected to one of the inputs CH0,...CH7. Ensure the input is
        within its specified absolute input voltage range. (It is easiest
        to tie the voltage source negative terminal to COM.) Ensure the voltage
        source is set within the range of 0V to +4.096V.
        (Swapping input voltages results in a reversed polarity reading.)

       Unipolar Mode:
        The voltage source should be connected to one of the inputs CH0,...CH7. Ensure the input is
        within its specified absolute input voltage range. (It is easiest
        to tie the voltage source negative terminal to COM.) Ensure the voltage
        source is set within the range of 0V to +4.096V.

      How to test Differential Mode:
       Bipolar Mode:
         The voltage source should be connected between paired channels. Ensure both
         inputs are within their specified absolute input voltage range. (It is easiest
         to tie the voltage source negative terminal to COM or GND.) Ensure the voltage
         source is set within the range of 0 to +4.096V (differential voltage range).
         (Swapping input voltages results in a reversed polarity reading.)

       Unipolar Mode:
         The voltage source should be connected between paired channels. (It is easiest
         to tie the voltage source negative terminal to COM or GND.) Ensure both inputs
         are within their specified absolute input voltage range.  (It is easiest to tie
         the voltage source negative terminal to COM or GND.) Ensure the voltage source
         is set within the range of 0 to +4.096V (differential voltage range).

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

http://www.linear.com/product/LTC2308

http://www.linear.com/product/LTC2308#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.
- Neither the name of Analog Devices, Inc. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
- The use of this software may or may not infringe the patent rights of one or more patent holders. This license does not release you from the requirement that you obtain separate licenses from these patent holders to use this software.
- Use of the software either in source or binary form, must be run on or directly connected to an Analog Devices Inc. component.

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 DC1186A.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 uint8_t | print_user_command_differential ()
| Display selected differential channels. More...
static uint8_t | print_user_command_single_ended ()
| Display selected single-ended channel. More...
static void | print_channel_selection (uint8_t menu)
| Display selected differential channels. More...
static void | menu_1_read_input ()
| Read channels. More...
static void | menu_2_select_single_ended_differential ()
| Sets LTC2308 to Single-Ended or Differential. More...
static void | menu_3_select_uni_bipolar ()
| Select unipolar (0-REFCOMP) or bipolar (+/- 0.5 x REFCOMP) mode. More...
static void | menu_4_sleep ()
| Put LTC2308 to sleep (low power) More...
static void | setup ()
| Initialize Linduino. More...
static void | loop ()
| Repeats Linduino loop. More...

## Variables
static uint8_t | uni_bipolar = LTC2308_UNIPOLAR_MODE
| Default set for unipolar mode. More...
static uint8_t | single_ended_differential = LTC2308_SINGLE_ENDED_MODE
| LTC2308 Unipolar or Bipolar mode selection. More...
static uint8_t | LTC2308_bits = 12
| Resolution (12 bits) More...
static float | LTC2308_vref = 4.096
const uint8_t | BUILD_COMMAND_SINGLE_ENDED [8]
| Lookup table to build the command for single-ended mode, input with respect to GND. More...
const uint8_t | BUILD_COMMAND_DIFF [8]
| Lookup table to build the command for differential mode with the selected uni/bipolar mode. More...

## Function Documentation

## ◆ loop()

static void loop | ( | void |  | ) |
| static

Repeats Linduino loop.

Definition at line 151 of file DC1186A.ino.

## ◆ menu_1_read_input()

static void menu_1_read_input | ( |  | ) |
| static

Read channels.

Definition at line 188 of file DC1186A.ino.

## ◆ menu_2_select_single_ended_differential()

static void menu_2_select_single_ended_differential | ( |  | ) |
| static

Sets LTC2308 to Single-Ended or Differential.

Definition at line 292 of file DC1186A.ino.

## ◆ menu_3_select_uni_bipolar()

static void menu_3_select_uni_bipolar | ( |  | ) |
| static

Select unipolar (0-REFCOMP) or bipolar (+/- 0.5 x REFCOMP) mode.

Returns
  void

Definition at line 324 of file DC1186A.ino.

## ◆ menu_4_sleep()

static void menu_4_sleep | ( |  | ) |
| static

Put LTC2308 to sleep (low power)

Returns
  void

Definition at line 354 of file DC1186A.ino.

## ◆ print_channel_selection()

static void print_channel_selection | ( | 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 459 of file DC1186A.ino.

## ◆ print_prompt()

static void print_prompt | ( |  | ) |
| static

Prints main menu.

Definition at line 384 of file DC1186A.ino.

## ◆ print_title()

static void print_title | ( | void |  | ) |
| static

Prints the title block when program first starts.

Definition at line 368 of file DC1186A.ino.

## ◆ print_user_command_differential()

static uint8_t print_user_command_differential | ( |  | ) |
| 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 397 of file DC1186A.ino.

## ◆ print_user_command_single_ended()

static uint8_t print_user_command_single_ended | ( |  | ) |
| static

Display selected single-ended channel.

Definition at line 492 of file DC1186A.ino.

## ◆ setup()

static void setup | ( | void |  | ) |
| static

Initialize Linduino.

Definition at line 138 of file DC1186A.ino.

## Variable Documentation

## ◆ BUILD_COMMAND_DIFF

const uint8_t BUILD_COMMAND_DIFF[8]

Initial value:
= {LTC2308_P0_N1, LTC2308_P2_N3, LTC2308_P4_N5, LTC2308_P6_N7,
LTC2308_P1_N0, LTC2308_P3_N2, LTC2308_P5_N4, LTC2308_P7_N6
}
LTC2308_P6_N7
#define LTC2308_P6_N7
Definition: LTC2308.h:126
LTC2308_P0_N1
#define LTC2308_P0_N1
Definition: LTC2308.h:117
LTC2308_P7_N6
#define LTC2308_P7_N6
Definition: LTC2308.h:127
LTC2308_P1_N0
#define LTC2308_P1_N0
Definition: LTC2308.h:118
LTC2308_P4_N5
#define LTC2308_P4_N5
Definition: LTC2308.h:123
LTC2308_P3_N2
#define LTC2308_P3_N2
Definition: LTC2308.h:121
LTC2308_P5_N4
#define LTC2308_P5_N4
Definition: LTC2308.h:124
LTC2308_P2_N3
#define LTC2308_P2_N3
Definition: LTC2308.h:120

Lookup table to build the command for differential mode with the selected uni/bipolar mode.

Build the command for differential mode

Definition at line 132 of file DC1186A.ino.

## ◆ BUILD_COMMAND_SINGLE_ENDED

const uint8_t BUILD_COMMAND_SINGLE_ENDED[8]

Initial value:
= {LTC2308_CH0, LTC2308_CH1, LTC2308_CH2, LTC2308_CH3,
LTC2308_CH4, LTC2308_CH5, LTC2308_CH6, LTC2308_CH7
}
LTC2308_CH5
#define LTC2308_CH5
Definition: LTC2308.h:109
LTC2308_CH2
#define LTC2308_CH2
Definition: LTC2308.h:106
LTC2308_CH4
#define LTC2308_CH4
Definition: LTC2308.h:108
LTC2308_CH7
#define LTC2308_CH7
Definition: LTC2308.h:111
LTC2308_CH3
#define LTC2308_CH3
Definition: LTC2308.h:107
LTC2308_CH6
#define LTC2308_CH6
Definition: LTC2308.h:110
LTC2308_CH1
#define LTC2308_CH1
Definition: LTC2308.h:105
LTC2308_CH0
#define LTC2308_CH0
Definition: LTC2308.h:104

Lookup table to build the command for single-ended mode, input with respect to GND.

Builds the command for single-ended mode, input with respect to GND

Definition at line 127 of file DC1186A.ino.

## ◆ LTC2308_bits

uint8_t LTC2308_bits = 12
| static

Resolution (12 bits)

Definition at line 122 of file DC1186A.ino.

## ◆ LTC2308_vref

float LTC2308_vref = 4.096
| static

Definition at line 123 of file DC1186A.ino.

## ◆ single_ended_differential

uint8_t single_ended_differential = LTC2308_SINGLE_ENDED_MODE
| static

LTC2308 Unipolar or Bipolar mode selection.

Definition at line 121 of file DC1186A.ino.

## ◆ uni_bipolar

uint8_t uni_bipolar = LTC2308_UNIPOLAR_MODE
| static

Default set for unipolar mode.

Definition at line 120 of file DC1186A.ino.