Linduino  1.3.0
Linear Technology Arduino-Compatible Demonstration Board

Linear Technology DC571A Demonstration Board. More...

Detailed Description

Linear Technology DC571A Demonstration Board.

LTC2418: 24-bit No Latency Delta Sigma 16-channel ADC

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. No external power supply is required. Ensure all jumpers on
    the demo board are installed in their default positions from the
    factory.

  How to test Single-Ended mode:
    The voltage source should be connected to the ADC such that the negative
    lead is connected to ground. The positive lead may be connected to any
    channel input. Ensure voltage is within analog input voltage range -0.3V 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 to CH0 with respect to COM pin. Next, Measure this voltage with a
    precise voltmeter and enter this value. (This takes the reading.) Apply a higher
    voltage than the first voltage or approximately 2.40 volts to CH0. Anything
    above 2.40 is not reccomened. It is very likely to reach the ADC's full-scale
    and poduce invalide lsb and offset. Measure this voltage with a precise
    voltmeter and enter this value. Calibration is now stored in EEPROM. 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/LTC2418

http://www.linear.com/product/LTC2418#demoboards

Copyright 2018(c) Analog Devices, Inc.

All rights reserved.

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Definition in file DC571A.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 void store_calibration ()
 Store measured calibration parameters to nonvolatile EEPROM on demo board. More...
 
static int8_t restore_calibration ()
 Read stored calibration parameters from nonvolatile EEPROM on demo board. More...
 
static int8_t menu_1_read_single_ended ()
 Read channels in single-ended mode. More...
 
static int8_t menu_2_read_differential ()
 Read channels in differential mode. More...
 
static int8_t menu_3_calibrate ()
 Calibrate ADC given two known inputs. 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 LTC2418_lsb = 5.9604652E-7
 Ideal LSB voltage for a perfect part. More...
 
static int32_t LTC2418_offset_code = 0
 Ideal offset for a perfect part. More...
 
const uint8_t BUILD_COMMAND_SINGLE_ENDED [16]
 Lookup table to build the command for single-ended mode channels. More...
 
const uint8_t BUILD_COMMAND_DIFF [16]
 Lookup table to build the command for differential mode channels. More...
 
const uint16_t MISO_TIMEOUT = 1000
 The MISO timeout (ms) More...
 

Function Documentation

◆ loop()

static void loop ( void  )
static

Repeats Linduino loop.

Definition at line 163 of file DC571A.ino.

◆ menu_1_read_single_ended()

static int8_t menu_1_read_single_ended ( )
static

Read channels in single-ended mode.

Returns
0 when m is entered into menu, 1 if timeout for EOC

Definition at line 201 of file DC571A.ino.

◆ menu_2_read_differential()

static int8_t menu_2_read_differential ( )
static

Read channels in differential mode.

Returns
0 when m is entered into menu, 1 if timeout for EOC

Definition at line 279 of file DC571A.ino.

◆ menu_3_calibrate()

static int8_t menu_3_calibrate ( )
static

Calibrate ADC given two known inputs.

Returns
0 if successful, 1 if timeout for EOC

Definition at line 369 of file DC571A.ino.

◆ print_prompt()

static void print_prompt ( )
static

Prints main menu.

Definition at line 435 of file DC571A.ino.

◆ print_title()

static void print_title ( void  )
static

Prints the title block when program first starts.

Definition at line 421 of file DC571A.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 447 of file DC571A.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 515 of file DC571A.ino.

◆ setup()

static void setup ( void  )
static

Initialize Linduino.

Definition at line 135 of file DC571A.ino.

◆ store_calibration()

static void store_calibration ( )
static

Store measured calibration parameters to nonvolatile EEPROM on demo board.

Definition at line 504 of file DC571A.ino.

Variable Documentation

◆ BUILD_COMMAND_DIFF

const uint8_t BUILD_COMMAND_DIFF[16]
Initial value:
}
#define LTC2418_P15_N14
Definition: LTC2418.h:159
#define LTC2418_P14_N15
Definition: LTC2418.h:158
#define LTC2418_P2_N3
Definition: LTC2418.h:140
#define LTC2418_P12_N13
Definition: LTC2418.h:155
#define LTC2418_P7_N6
Definition: LTC2418.h:147
#define LTC2418_P13_N12
Definition: LTC2418.h:156
#define LTC2418_P6_N7
Definition: LTC2418.h:146
#define LTC2418_P1_N0
Definition: LTC2418.h:138
#define LTC2418_P5_N4
Definition: LTC2418.h:144
#define LTC2418_P11_N10
Definition: LTC2418.h:153
#define LTC2418_P8_N9
Definition: LTC2418.h:149
#define LTC2418_P4_N5
Definition: LTC2418.h:143
#define LTC2418_P10_N11
Definition: LTC2418.h:152
#define LTC2418_P3_N2
Definition: LTC2418.h:141
#define LTC2418_P9_N8
Definition: LTC2418.h:150
#define LTC2418_P0_N1
Definition: LTC2418.h:137

Lookup table to build the command for differential mode channels.

Build the command for differential

Definition at line 126 of file DC571A.ino.

◆ BUILD_COMMAND_SINGLE_ENDED

const uint8_t BUILD_COMMAND_SINGLE_ENDED[16]
Initial value:
}
#define LTC2418_CH3
Definition: LTC2418.h:119
#define LTC2418_CH0
Definition: LTC2418.h:116
#define LTC2418_CH5
Definition: LTC2418.h:121
#define LTC2418_CH7
Definition: LTC2418.h:123
#define LTC2418_CH11
Definition: LTC2418.h:127
#define LTC2418_CH13
Definition: LTC2418.h:129
#define LTC2418_CH10
Definition: LTC2418.h:126
#define LTC2418_CH2
Definition: LTC2418.h:118
#define LTC2418_CH4
Definition: LTC2418.h:120
#define LTC2418_CH9
Definition: LTC2418.h:125
#define LTC2418_CH8
Definition: LTC2418.h:124
#define LTC2418_CH12
Definition: LTC2418.h:128
#define LTC2418_CH6
Definition: LTC2418.h:122
#define LTC2418_CH15
Definition: LTC2418.h:131
#define LTC2418_CH1
Definition: LTC2418.h:117
#define LTC2418_CH14
Definition: LTC2418.h:130

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

Builds the command for single-ended mode

Definition at line 119 of file DC571A.ino.

◆ demo_board_connected

uint8_t demo_board_connected
static

Set to 1 if the board is connected.

Definition at line 112 of file DC571A.ino.

◆ LTC2418_lsb

float LTC2418_lsb = 5.9604652E-7
static

Ideal LSB voltage for a perfect part.

Definition at line 113 of file DC571A.ino.

◆ LTC2418_offset_code

int32_t LTC2418_offset_code = 0
static

Ideal offset for a perfect part.

Definition at line 114 of file DC571A.ino.

◆ MISO_TIMEOUT

const uint16_t MISO_TIMEOUT = 1000

The MISO timeout (ms)

Definition at line 132 of file DC571A.ino.