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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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LTC2497: 16-Bit, 16-Channel Delta Sigma ADCs with Easy Drive Input Current Cancellation. More...
LTC2497: 16-Bit, 16-Channel Delta Sigma ADCs with Easy Drive Input Current Cancellation.
The LTC2497 is a 16-channel (eight differential), 16-bit, No Latency Delta Sigma TM ADC with Easy Drive technology and a 2-wire, I2C interface. The patented sampling scheme eliminates dynamic input current errors and the shortcomings of on-chip buffering through automatic cancellation of differential input current. This allows large external source impedances and rail-to-rail input signals to be directly digitized while maintaining exceptional DC accuracy. I2C DATA FORMAT (MSB FIRST): Data In: Byte #1 Byte #2 START SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK 1 0 EN SGL ODD A2 A1 A0 NACK Stop Data Out: Byte #1 Byte #2 MSB Start SA6 SA5 SA4 SA3 SA2 SA1 SA0 R SACK SGN D15 D14 D13 D12 D11 D10 D9 MACK Byte #3 Byte #4 LSB D8 D7 D6 D5 D4 D3 D2 D1 MACK D0 X X X X X X X MNACK STOP START : I2C Start Repeat Start: I2c Repeat Start STOP : I2C Stop SAx : I2C Address SACK : I2C Slave Generated Acknowledge (Active Low) MACK : I2C Master Generated Acknowledge (Active Low) MNACK : I2c Master Generated Not Acknowledge W : I2C Write (0) R : I2C Read (1) Cx : Command Code Dx : Data Bits X : Don't care EN : Enable Bit SGL : Single Ended Bit ODD : Polarity Bit SGN : Sign Bit Example Code: Read differential with CH0 as positive and CH1 as negative: uint8_t ack; int32_t adc_code = 0; float adc_voltage; adc_command = LTC24XX_MULTI_CH_P0_N1; ack |= LTC2497_read(i2c_address, adc_command, &adc_code); adc_voltage = LTC2497_code_to_voltage(adc_code, LTC2497_vref);
http://www.linear.com/product/LTC2497
http://www.linear.com/product/LTC2497#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 LTC2497: 16-Bit, 16-Channel Delta Sigma ADCs with Easy Drive Input Current Cancellation
Definition in file LTC2497.h.
Go to the source code of this file.
Functions | |
uint8_t | LTC2497_read (uint8_t i2c_address, uint8_t adc_command, int32_t *adc_code, uint16_t timeout) |
Reads from LTC2497. More... | |
float | LTC2497_code_to_voltage (int32_t adc_code, float vref) |
Calculates the voltage corresponding to an ADC code, given the reference (in volts) More... | |
Macros | |
I2C_Addresses | |
#define | LTC2497_I2C_ADDRESS 0x76 |
I2C address of the LTC2497. More... | |
#define | LTC2497_I2C_GLOBAL_ADDRESS 0x77 |
LTC2497 Global I2C Address. More... | |
float LTC2497_code_to_voltage | ( | int32_t | adc_code, |
float | vref | ||
) |
Calculates the voltage corresponding to an ADC code, given the reference (in volts)
adc_code | Code read from ADC |
vref | VRef (in volts) |
Definition at line 85 of file LTC2497.cpp.
uint8_t LTC2497_read | ( | uint8_t | i2c_address, |
uint8_t | adc_command, | ||
int32_t * | adc_code, | ||
uint16_t | timeout | ||
) |
Reads from LTC2497.
i2c_address | I2C address (7-bit format) for part |
adc_command | Byte command written to LTC2497 |
adc_code | 4 byte conversion code read from LTC2497 |
timeout | Timeout (in milliseconds) |
Definition at line 79 of file LTC2497.cpp.
#define LTC2497_I2C_ADDRESS 0x76 |