Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
LTC2485.h
Go to the documentation of this file.
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/*!
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LTC2485: 24-Bit Delta Sigma ADC with Easy Drive Input Current Cancellation and
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I2C Interface
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@verbatim
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The LTC2485 combines a 24-bit plus sign No Latency Delta Sigma analog-to-digital
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converter with patented Easy Drive technology and I2C digital interface. The
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patented sampling scheme eliminates dynamic input current errors and the
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shortcomings of on-chip buffering through automatic cancellation of differential
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input current. This allows large external source impedances and input signals,
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with rail-to-rail input range to be directly digitized while maintaining
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exceptional DC accuracy.
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Example Code:
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Read input with 1X speed mode and rejection frequency of 60Hz
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adc_command = LTC2485_R60 | LTC2485_SPEED_1X; // Set to 1X mode with 60hz rejection
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ack |= LTC2485_read(i2c_address, adc_command, &adc_code); // Throws out last reading
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ack |= LTC2485_read(i2c_address, adc_command, &adc_code); // Obtains the current reading and stores to adc_code variable
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@endverbatim
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http://www.linear.com/product/LTC2485
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http://www.linear.com/product/LTC2485#demoboards
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Copyright 2018(c) Analog Devices, Inc.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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- Neither the name of Analog Devices, Inc. nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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- The use of this software may or may not infringe the patent rights
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of one or more patent holders. This license does not release you
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from the requirement that you obtain separate licenses from these
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patent holders to use this software.
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- Use of the software either in source or binary form, must be run
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on or directly connected to an Analog Devices Inc. component.
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THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*! @file
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@ingroup LTC2485
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Header for LTC2485: 24-Bit Delta Sigma ADC with Easy Drive Input Current Cancellation and I2C Interface
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*/
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#ifndef LTC2485_H
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#define LTC2485_H
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#include "
Linduino.h
"
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/*! @name I2C_Addresses
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@{ */
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//! I2C address of the LTC2485.
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//! Configured by tying the CA1 and CA0 pins high, low, or left floating. See Table 4 of datasheet.
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//! Uncomment LTC2485_I2C_ADDRESS to match demo board configuration.
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// Address assignment
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// LTC2485 I2C Address // CA1 CA0
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// #define LTC2485_I2C_ADDRESS 0b0010100 // Low High
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// #define LTC2485_I2C_ADDRESS 0b0010101 // Low Float
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// #define LTC2485_I2C_ADDRESS 0b0010111 // Float High
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// #define LTC2485_I2C_ADDRESS 0b0100100 // Float Float
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// #define LTC2485_I2C_ADDRESS 0b0100110 // High High
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// #define LTC2485_I2C_ADDRESS 0b0100111 // High Float
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//! LTC2485 Global I2C Address.
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#define LTC2485_I2C_GLOBAL_ADDRESS 0b1110111 // Global Address
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/*! @} */
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/*! @name Mode Configuration
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@{
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See Table 1 of datasheet.
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*/
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#define LTC2485_SPEED_1X 0x00
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#define LTC2485_SPEED_2X 0x01
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#define LTC2485_INTERNAL_TEMP 0x08
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// Select rejection frequency - 50 and 60, 50, or 60Hz
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#define LTC2485_R50 0x02
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#define LTC2485_R60 0x04
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#define LTC2485_R50_R60 0x00
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/*!
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@}
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*/
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/*Commands
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Construct the control word by bitwise ORing the MODE configuration options.
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See Table 1 of datasheet. (C3,C2,C1,C1=X11X is reserved.)
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Example - reject 60Hz with 2X mode enabled.
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adc_command = (LTC2485_R60 | LTC2485_SPEED_2X);
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*/
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//! Reads from LTC2485 ADC that accepts an 8 bit configuration and returns a 24 bit result.
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//! @return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
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int8_t
LTC2485_read
(uint8_t
i2c_address
,
//!< I2C address (7-bit format) for part
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uint8_t
adc_command
,
//!< Command byte written to LTC2485. Example: (LTC2485_R60 | LTC2485_SPEED_2X)
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int32_t *
adc_code
,
//!< Conversion code read from LTC2485. The LTC2485's 32-bit code is converted to 24-bits inside this function.
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uint16_t
eoc_timeout
//!< Timeout in ms
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);
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#endif // LTC2485_H
i2c_address
uint8_t i2c_address
adc_command
static uint8_t adc_command
Definition:
DC2071AA.ino:111
Linduino.h
Header File for Linduino Libraries and Demo Code.
eoc_timeout
static uint16_t eoc_timeout
timeout in ms
Definition:
LTC2492_Panel_Meter.ino:135
LTC2485_read
int8_t LTC2485_read(uint8_t i2c_address, uint8_t adc_command, int32_t *adc_code, uint16_t eoc_timeout)
Reads from LTC2485 ADC that accepts an 8 bit configuration and returns a 24 bit result.
Definition:
LTC2485.cpp:70
adc_code
static uint32_t adc_code
Definition:
DC2071AA.ino:113
LTSketchbook
libraries
LTC2485
LTC2485.h
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