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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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Linear Technology DC806A Demonstration Board. More...
Linear Technology DC806A Demonstration Board.
LTC1867: 16-Bit, 8-Channel 200ksps 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 (to monitor voltage source). No external power supply is required. Ensure JP1 is installed in the default position 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 the GND pin. The positive lead may be connected to any channel input. Ensure voltage is within analog input voltage range 0 to +4.096V. How to test Single-Ended mode with CH7 as COM: The voltage source should be connected to the ADC such that the negative lead is connected to both GND and the common (COM) pin. The positive lead may be connected to any channel inputs 0-6. Ensure voltage is within analog input voltage range 0 to +4.096V. How to test Differential Mode: Bipolar Mode: The voltage source should be connected with positive and negative leads to paired channels. The negative lead of the voltage source must also be connected to the GND pin in order to provide a ground-referenced voltage. Ensure voltage is within the range of 0 to +2.048V. Swapping input voltages results in a reversed polarity reading. Unipolar Mode: The voltage source should be connected with positive and negative leads to paired channels. The negative lead of the voltage source must also be connected to the GND pin in order to provide a ground-referenced voltage. Ensure voltage is within the range of 0 to +4.096V. Swapping input voltages results in a zero reading. How to calibrate: Apply 100mV to CH0 and connect CH1 to GND. Measure this voltage with a precise voltmeter and enter this value. (This takes the reading.) Now apply approximately 4.00 volts to CH0. Measure this voltage with a precise voltmeter and enter this value. Short CH0 and CH1 to ground. Next, hit ENTER. (This takes the reading.) 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/LTC1867
http://www.linear.com/product/LTC1867#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 DC806A.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 void | menu_1_read_single_ended () |
Read channels in single-ended mode. More... | |
static void | menu_2_read_differential () |
Read channels in differential mode. More... | |
static void | menu_3_read_single_ended_com7 () |
Read Channels in Single-Ended mode with Ch7 as COM. More... | |
static void | menu_4_calibrate () |
Calibrate ADC given two known inputs @ return void. More... | |
static void | menu_5_sleep () |
Put LTC1867 to sleep (low power) More... | |
static void | menu_6_select_uni_bipolar () |
Select unipolar (0-REFCOMP) or bipolar (+/- 0.5 x REFCOMP) 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 | uni_bi_polar = LTC1867_UNIPOLAR_MODE |
The LTC1867 unipolar/bipolar mode selection. More... | |
static float | LTC1867_lsb = 6.25009537E-5 |
Ideal LSB voltage for a perfect part. More... | |
static int32_t | LTC1867_offset_unipolar_code = 0 |
Ideal unipolar offset for a perfect part. More... | |
static int32_t | LTC1867_offset_bipolar_code = 0 |
Ideal bipolar offset for a perfect part. More... | |
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_SINGLE_ENDED_COM7 [7] |
Lookup table to build the command for single-ended mode with channel 7 as common pin. More... | |
const uint8_t | BUILD_COMMAND_DIFF [8] |
Lookup table to build the command for differential mode with the selected uni/bipolar mode. More... | |
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Repeats Linduino loop.
Definition at line 170 of file DC806A.ino.
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Read Channels in Single-Ended mode with Ch7 as COM.
Definition at line 395 of file DC806A.ino.
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Calibrate ADC given two known inputs @ return void.
Definition at line 483 of file DC806A.ino.
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Select unipolar (0-REFCOMP) or bipolar (+/- 0.5 x REFCOMP) mode.
Definition at line 555 of file DC806A.ino.
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Prints main menu.
Definition at line 623 of file DC806A.ino.
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Prints the title block when program first starts.
Definition at line 607 of file DC806A.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 643 of file DC806A.ino.
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Read stored calibration parameters from nonvolatile EEPROM on demo board.
Definition at line 583 of file DC806A.ino.
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Initialize Linduino.
Definition at line 150 of file DC806A.ino.
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Store measured calibration parameters to nonvolatile EEPROM on demo board.
Definition at line 571 of file DC806A.ino.
const uint8_t BUILD_COMMAND_DIFF[8] |
Lookup table to build the command for differential mode with the selected uni/bipolar mode.
Build the command for differential mode
Definition at line 145 of file DC806A.ino.
const uint8_t BUILD_COMMAND_SINGLE_ENDED[8] |
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 135 of file DC806A.ino.
const uint8_t BUILD_COMMAND_SINGLE_ENDED_COM7[7] |
Lookup table to build the command for single-ended mode with channel 7 as common pin.
Builds the command for single-ended mode, input with respect to CH7
Definition at line 140 of file DC806A.ino.
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Set to 1 if the board is connected.
Definition at line 126 of file DC806A.ino.
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Ideal LSB voltage for a perfect part.
Definition at line 128 of file DC806A.ino.
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Ideal bipolar offset for a perfect part.
Definition at line 130 of file DC806A.ino.
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Ideal unipolar offset for a perfect part.
Definition at line 129 of file DC806A.ino.
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The LTC1867 unipolar/bipolar mode selection.
Definition at line 127 of file DC806A.ino.