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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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LTC2461: 16-Bit I2C Delta Sigma ADCs with 10ppm/C Max Precision Reference. More...
LTC2461: 16-Bit I2C Delta Sigma ADCs with 10ppm/C Max Precision Reference.
LTC2463: Differential, 16-Bit I2C Delta Sigma ADCs with 10ppm/C Max Precision Reference. LTC2453: Differential, 16-Bit Delta Sigma ADC With I2C Interface.
The LTC2461/LTC2463 are ultra tiny, 16-Bit analog-todigital converters with an integrated precision reference. They use a single 2.7V to 5.5V supply and communicate through an I2C Interface. The LTC2461 is single-ended with a 0V to 1.25V input range and the LTC2463 is differential with a 1.25V input range. Both ADCs include a 1.25V integrated reference with 2ppm/C drift performance and 0.1% initial accuracy. The converters are available in a 12-pin 3mm x 3mm DFN package or an MSOP-12 package. They include an integrated oscillator and perform conversions with no latency for multiplexed applications. The LTC2461/LTC2463 include a proprietary input sampling scheme that reduces the average input current several orders of magnitude when compared to conventional delta sigma converters I2C DATA FORMAT (MSB First): Byte #1 Byte #2 Byte #3 START SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK EN1 EN2 SPD SLP X X X X SACK STOP START SA6 SA5 SA4 SA3 SA2 SA1 SA0 R SACK D15 D14 D13 D12 D11 D10 D9 D8 MACK D7 D6 D5 D4 D3 D2 D1 D0 MNACK STOP SACK : Slave Acknowledge MACK : Master Acknowledge MNACK : Master Not Acknowledge Sx : Address Select Bit EN1 : Enable 1 : to program, EN1 = High, EN2 = Low EN2 : Enable 2 SPD : Speed Bit- 0 for 60Hz, 1 for 30Hz SLP : Sleep Mode Bit X : Don't care Dx : Data Bits Example Code: Read ADC in 60Hz Speed Mode ack |= LTC2461_read(LTC2461_I2C_ADDRESS, LTC2461_60HZ_SPEED_MODE, &adc_code_60Hz); // Throws out last reading ack |= LTC2461_read(LTC2461_I2C_ADDRESS, LTC2461_60HZ_SPEED_MODE, &adc_code_60Hz); // Obtains the current reading and // stores to adc_code_60Hz variable // Convert adc_code_60Hz to voltage adc_voltage_60Hz = LTC2461_code_to_voltage(adc_code_60Hz, LTC2461_lsb, LTC2461_offset_code);
http://www.linear.com/product/LTC2461 http://www.linear.com/product/LTC2463 http://www.linear.com/product/LTC2453
http://www.linear.com/product/LTC2461#demoboards http://www.linear.com/product/LTC2463#demoboards http://www.linear.com/product/LTC2453#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.
Header for LTC2461: 16-Bit I2C Delta Sigma ADCs with 10ppm/C Max Precision Reference
Definition in file LTC2461.h.
Go to the source code of this file.
Functions | |
int8_t | LTC2461_read (uint8_t i2c_address, uint8_t adc_command, uint16_t *adc_code) |
Reads the ADC and returns 16-bit data. More... | |
int8_t | LTC2461_command (uint8_t i2c_address, uint8_t adc_command) |
Write a 16-bit command to the ADC. More... | |
float | LTC2461_code_to_voltage (uint16_t adc_code, float LTC2461_lsb, int32_t LTC2461_offset_code) |
Calculates the LTC2309 input unipolar voltage. More... | |
void | LTC2461_cal_voltage (uint16_t zero_code, uint16_t fs_code, float zero_voltage, float fs_voltage, float *LTC2461_lsb, int32_t *LTC2461_offset_code) |
Calibrate the lsb. More... | |
Macros | |
I2C addresses | |
Un-comment the address corresponding to the LTC2309's address | |
#define | LTC2461_I2C_ADDRESS 0x14 |
Modes | |
#define | LTC2461_30HZ_SPEED_MODE 0xA0 |
#define | LTC2461_60HZ_SPEED_MODE 0x80 |
#define | LTC2461_SLEEP_MODE 0x90 |
void LTC2461_cal_voltage | ( | uint16_t | zero_code, |
uint16_t | fs_code, | ||
float | zero_voltage, | ||
float | fs_voltage, | ||
float * | LTC2461_lsb, | ||
int32_t * | LTC2461_offset_code | ||
) |
Calibrate the lsb.
zero_code | Code from zero reading |
fs_code | Full-scale code |
zero_voltage | Measured zero voltage |
fs_voltage | Measured full-scale voltage |
LTC2461_lsb | Return LSB value (volts) |
LTC2461_offset_code | Return Offset code |
Definition at line 111 of file LTC2461.cpp.
float LTC2461_code_to_voltage | ( | uint16_t | adc_code, |
float | LTC2461_lsb, | ||
int32_t | LTC2461_offset_code | ||
) |
Calculates the LTC2309 input unipolar voltage.
adc_code | Raw ADC code |
LTC2461_lsb | LSB value (volts) |
LTC2461_offset_code | Offset code |
Definition at line 103 of file LTC2461.cpp.
int8_t LTC2461_command | ( | uint8_t | i2c_address, |
uint8_t | adc_command | ||
) |
Write a 16-bit command to the ADC.
Derived from 2655.
i2c_address | I2C address of the LTC2461. |
adc_command | ADC command to be written to the LTC2461. |
Definition at line 93 of file LTC2461.cpp.
int8_t LTC2461_read | ( | uint8_t | i2c_address, |
uint8_t | adc_command, | ||
uint16_t * | adc_code | ||
) |
Reads the ADC and returns 16-bit data.
i2c_address | I2C address of the LTC2461. |
adc_command | ADC command to be written to the LTC2461. |
adc_code | Returns code read from ADC. |
Definition at line 82 of file LTC2461.cpp.