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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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Linear Technology DC571A Demonstration Board. More...
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.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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 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... | |
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Repeats Linduino loop.
Definition at line 163 of file DC571A.ino.
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Read channels in single-ended mode.
Definition at line 201 of file DC571A.ino.
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Read channels in differential mode.
Definition at line 279 of file DC571A.ino.
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Calibrate ADC given two known inputs.
Definition at line 369 of file DC571A.ino.
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Prints main menu.
Definition at line 435 of file DC571A.ino.
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Prints the title block when program first starts.
Definition at line 421 of file DC571A.ino.
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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.
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Read stored calibration parameters from nonvolatile EEPROM on demo board.
Definition at line 515 of file DC571A.ino.
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Initialize Linduino.
Definition at line 135 of file DC571A.ino.
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Store measured calibration parameters to nonvolatile EEPROM on demo board.
Definition at line 504 of file DC571A.ino.
const uint8_t BUILD_COMMAND_DIFF[16] |
Lookup table to build the command for differential mode channels.
Build the command for differential
Definition at line 126 of file DC571A.ino.
const uint8_t BUILD_COMMAND_SINGLE_ENDED[16] |
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.
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Set to 1 if the board is connected.
Definition at line 112 of file DC571A.ino.
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Ideal LSB voltage for a perfect part.
Definition at line 113 of file DC571A.ino.
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Ideal offset for a perfect part.
Definition at line 114 of file DC571A.ino.
const uint16_t MISO_TIMEOUT = 1000 |
The MISO timeout (ms)
Definition at line 132 of file DC571A.ino.