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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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Linear Technology DC1011A-A Demonstration Board. More...
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:
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... | |
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Repeats Linduino loop.
Definition at line 158 of file DC1011AA.ino.
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Read channels in single-ended mode.
Definition at line 282 of file DC1011AA.ino.
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Read channels in differential mode.
Definition at line 368 of file DC1011AA.ino.
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Read Temperature.
Definition at line 472 of file DC1011AA.ino.
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Set 1X or 2X mode.
Definition at line 505 of file DC1011AA.ino.
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Prints main menu.
Definition at line 213 of file DC1011AA.ino.
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Prints the title block when program first starts.
Definition at line 198 of file DC1011AA.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 224 of file DC1011AA.ino.
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Initialize Linduino.
Definition at line 134 of file DC1011AA.ino.
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.
const uint8_t BUILD_COMMAND_DIFF[16] |
Lookup table to build the command for differential mode.
Build the command for differential mode
Definition at line 124 of file DC1011AA.ino.
const uint8_t BUILD_COMMAND_SINGLE_ENDED[16] |
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.
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Set to 1 if the board is connected.
Definition at line 109 of file DC1011AA.ino.
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timeout in ms
Definition at line 113 of file DC1011AA.ino.
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The LTC2498 ideal reference voltage.
Definition at line 112 of file DC1011AA.ino.
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The LTC2498 rejection mode settings.
Definition at line 111 of file DC1011AA.ino.
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The LTC2498 2X Mode settings.
Definition at line 110 of file DC1011AA.ino.