Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
LTC2460.h
Go to the documentation of this file.
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/*!
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LTC2460 Ultra-Tiny, 16-bit delta sigma ADCs with 10ppm/degree C Max Precision Reference
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@verbatim
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The LTC2460/LTC2462 are ultra tiny, 16-Bit analog-to- digital converters
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with an integrated precision reference. They use a single 2.7V to 5.5V supply
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and communicate through an SPI Interface. The LTC2460 is single-ended with
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a 0V to VREF input range and the LTC2462 is differential with a ±VREF input
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range. Both ADC’s include a 1.25V integrated reference with 2ppm/°C drift
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performance and 0.1% initial accuracy. The converters are available in a
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12-pin DFN 3mm × 3mm package or an MSOP-12 package. They include an integrated
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oscillator and perform conversions with no latency for multiplexed applications.
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The LTC2460/LTC2462 include a proprietary input sampling scheme that reduces
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the average input current several orders of magnitude when compared to conventional
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delta sigma converters.
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SPI DATA FORMAT (MSB First):
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Byte #1 Byte #2
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Data Out : D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D10
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Data In : EN1 EN2 SPD SLP X X X X X X X X X X X X
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Dx : Data Bits
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EN1/EN2 : Enable Bits (00-keep previous mode, 10-change mode)
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SPD : Double Output Rate Select Bit (1-Normal rate 30hz, auto-calibration on, 0- 2x rate 60hz, auto_calibration off)
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SLP : 1 - powers down chip reference after the next conversion is complete
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Command Byte #1
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EN1 EN2 SPD SLP Comments
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0 X X X Keep Previous Mode
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1 0 1 X 60 Hz conversion
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1 0 0 X 30 Hz auto-calibrated conversion
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Example Code:
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Read in 2X mode without turning off reference
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uint16_t miso_timeout = 1000;
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adc_command =LTC2460_SPEED_2X | LTC2460_REF_ON; // Build ADC command for channel 0
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LTC2460_read(LTC2460_CS, adc_command, &adc_code); // Throws out last reading
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delay(50);
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LTC2460_read(LTC2460_CS, adc_command, &adc_code); // Obtains the current reading and stores to adc_code variable
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// Convert adc_code to voltage
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adc_voltage = LTC2460_code_to_voltage(adc_code, LTC2460_lsb);
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@endverbatim
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http://www.linear.com/product/LTC2460
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http://www.linear.com/product/LTC2460#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 LTC2460
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Header for LTC2460: Ultra-Tiny, 16-bit delta sigma ADCs with 10ppm/degree C Max Precision Reference
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*/
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#ifndef LTC2460_H
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#define LTC2460_H
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//! Define the SPI CS pin
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#ifndef LTC2460_CS
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#define LTC2460_CS QUIKEVAL_CS
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#endif
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/*! @name Mode Configuration
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@{
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*/
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#define LTC2460_KEEP_PREVIOUS_MODE 0x00
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#define LTC2460_SPEED_1X 0xA0
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#define LTC2460_SPEED_2X 0x80
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#define LTC2460_REF_ON 0x00
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#define LTC2460_REF_OFF 0x10
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/*!
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@}
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*/
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/*Commands
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Construct a control word by bitwise ORing bitfields defined above.
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Example - read with 1X mode enabled and reference on.
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adc_command = (LTC2460_SPEED_1X | LTC2460_REF_ON);
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*/
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//! Reads from LTC2460.
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void
LTC2460_read
(uint8_t cs,
//!< Chip select
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uint8_t
adc_command
,
//!< 1 byte command written to LTC2460
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int32_t *
adc_code
//!< 4 byte conversion code read from LTC2460
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);
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//! Calculates the voltage corresponding to an adc code, given the reference (in volts)
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//! @return Returns voltage calculated from ADC code.
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float
LTC2460_code_to_voltage
(int32_t
adc_code
,
//!< Code read from adc
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float
vref
//!< VRef (in volts)
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);
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#endif // LTC2460_H
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adc_command
static uint8_t adc_command
Definition:
DC2071AA.ino:111
LTC2460_read
void LTC2460_read(uint8_t cs, uint8_t adc_command, int32_t *adc_code)
Definition:
LTC2460.cpp:77
LTC2460_code_to_voltage
float LTC2460_code_to_voltage(int32_t adc_code, float vref)
Calculates the voltage corresponding to an adc code, given the reference (in volts) ...
Definition:
LTC2460.cpp:86
vref
float vref
Definition:
LTC2492_Thermocouple_Meter.ino:129
adc_code
static uint32_t adc_code
Definition:
DC2071AA.ino:113
LTSketchbook
libraries
LTC2460
LTC2460.h
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