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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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LTC2309: 8-channel, 12-Bit SAR ADC with I2C interface LTC2301: 1-Channel, 12-Bit ADCs with I2C Compatible Interface. More...
LTC2309: 8-channel, 12-Bit SAR ADC with I2C interface LTC2301: 1-Channel, 12-Bit ADCs with I2C Compatible Interface.
The LTC2309 is a low noise, low power, 8-channel, 12-bit successive approximation ADC with an I2C compatible serial interface. This ADC includes an internal reference and a fully differential sample-and-hold circuit to reduce common mode noise. The LTC2309 operates from an internal clock to achieve a fast 1.3 microsecond conversion time. The LTC2309 operates from a single 5V supply and draws just 300 microamps at a throughput rate of 1ksps. The ADC enters nap mode when not converting, reducing the power dissipation. I2C DATA FORMAT (MSB First): Byte #1 Byte #2 START SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK SD OS S1 S0 UNI SLP X X SACK Byte #3 Byte #4 Byte #5 Repeat Start SA6 SA5 SA4 SA3 SA2 SA1 SA0 R SACK D11 D10 D9 D8 D7 D6 D5 D4 MACK D3 D2 D1 D0 X X X X MNACK STOP SACK : Slave Acknowledge MACK : Master Acknowledge MNACK : Master Not Acknowledge SD : Single, Differential# Bit OS : ODD, Sign# Bit Sx : Address Select Bit COM : CH7/COM Configuration Bit UNI : Unipolar, Bipolar# Bit SLP : Sleep Mode Bit Dx : Data Bits X : Don't care Example Code: Read Channel 0 in Single-Ended Unipolar mode adc_command = LTC2309_CH0 | LTC2309_UNIPOLAR_MODE; // Build ADC command for channel 0 ack |= LTC2309_read(LTC2309_I2C_ADDRESS, adc_command, &adc_code); // Throws out last reading ack |= LTC2309_read(LTC2309_I2C_ADDRESS, adc_command, &adc_code); // Obtains the current reading and stores to adc_code variable // Convert adc_code to voltage adc_voltage = LTC2309_unipolar_code_to_voltage(adc_code, LTC2309_lsb, LTC2309_offset_code);
http://www.linear.com/product/LTC2309 http://www.linear.com/product/LTC2301
http://www.linear.com/product/LTC2309#demoboards http://www.linear.com/product/LTC2301#demoboards
Copyright 2018(c) Analog Devices, Inc.
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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 LTC2309: 8-channel, 12-Bit SAR ADC with I2C interface
Definition in file LTC2309.h.
Go to the source code of this file.
Functions | |
int8_t | LTC2309_read (uint8_t i2c_address, uint8_t adc_command, uint16_t *ptr_adc_code) |
Reads 12-bit code from LTC2309, programs channel and mode for next conversion. More... | |
float | LTC2309_code_to_voltage (uint16_t adc_code, float LTC2309_vref, uint8_t uni_bipolar) |
Calculates the LTC2309 input voltage. More... | |
Macros | |
I2C addresses | |
Un-comment the address corresponding to the LTC2309's address | |
#define | LTC2309_I2C_ADDRESS 0x08 |
Single-Ended Channel Configuration | |
#define | LTC2309_CH0 0x80 |
#define | LTC2309_CH1 0xC0 |
#define | LTC2309_CH2 0x90 |
#define | LTC2309_CH3 0xD0 |
#define | LTC2309_CH4 0xA0 |
#define | LTC2309_CH5 0xE0 |
#define | LTC2309_CH6 0xB0 |
#define | LTC2309_CH7 0xF0 |
Differential Channel Configuration | |
#define | LTC2309_P0_N1 0x00 |
#define | LTC2309_P1_N0 0x40 |
#define | LTC2309_P2_N3 0x10 |
#define | LTC2309_P3_N2 0x50 |
#define | LTC2309_P4_N5 0x20 |
#define | LTC2309_P5_N4 0x60 |
#define | LTC2309_P6_N7 0x30 |
#define | LTC2309_P7_N6 0x70 |
LTC2309 Configuration Bits | |
#define | LTC2309_SLEEP_MODE 0x04 |
#define | LTC2309_EXIT_SLEEP_MODE 0x00 |
#define | LTC2309_UNIPOLAR_MODE 0x08 |
#define | LTC2309_BIPOLAR_MODE 0x00 |
#define | LTC2309_SINGLE_ENDED_MODE 0x80 |
#define | LTC2309_DIFFERENTIAL_MODE 0x00 |
float LTC2309_code_to_voltage | ( | uint16_t | adc_code, |
float | LTC2309_vref, | ||
uint8_t | uni_bipolar | ||
) |
Calculates the LTC2309 input voltage.
adc_code | Code read from ADC |
LTC2309_vref | LSB value (volts) |
Definition at line 106 of file LTC2309.cpp.
int8_t LTC2309_read | ( | uint8_t | i2c_address, |
uint8_t | adc_command, | ||
uint16_t * | ptr_adc_code | ||
) |
Reads 12-bit code from LTC2309, programs channel and mode for next conversion.
i2c_address | I2C address of device |
adc_command | ADC command / address bits |
ptr_adc_code | Returns code read from ADC |
Definition at line 89 of file LTC2309.cpp.