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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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LTC2305: 8-channel, 12-Bit SAR ADC with I2C interface. More...
LTC2305: 8-channel, 12-Bit SAR ADC with I2C interface.
The LTC2305 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 LTC2305 operates from an internal clock to achieve a fast 1.3 microsecond conversion time. The LTC2305 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 = LTC2305_CH0 | LTC2305_UNIPOLAR_MODE; // Build ADC command for channel 0 ack |= LTC2305_read(LTC2305_I2C_ADDRESS, adc_command, &adc_code); // Throws out last reading ack |= LTC2305_read(LTC2305_I2C_ADDRESS, adc_command, &adc_code); // Obtains the current reading and stores to adc_code variable // Convert adc_code to voltage adc_voltage = LTC2305_unipolar_code_to_voltage(adc_code, LTC2305_lsb, LTC2305_offset_code);
http://www.linear.com/product/LTC2305
http://www.linear.com/product/LTC2305#demoboards
Copyright 2018(c) Analog Devices, Inc.
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Header for LTC2305: 8-channel, 12-Bit SAR ADC with I2C interface
Definition in file LTC2305.h.
Go to the source code of this file.
Functions | |
int8_t | LTC2305_read (uint8_t i2c_address, uint8_t adc_command, uint16_t *ptr_adc_code) |
Reads 12-bit code from LTC2305, programs channel and mode for next conversion. More... | |
float | LTC2305_code_to_voltage (uint16_t adc_code, float LTC2305_vref, uint8_t uni_bipolar) |
Calculates the LTC2305 input voltage. More... | |
Macros | |
I2C addresses | |
Un-comment the address corresponding to the LTC2305's address | |
#define | LTC2305_I2C_ADDRESS 0x08 |
Single-Ended Channel Configuration | |
#define | LTC2305_CH0 0xC0 |
#define | LTC2305_CH1 0x80 |
LTC2305 Configuration Bits | |
#define | LTC2305_SLEEP_MODE 0x04 |
#define | LTC2305_EXIT_SLEEP_MODE 0x00 |
#define | LTC2305_UNIPOLAR_MODE 0x08 |
#define | LTC2305_BIPOLAR_MODE 0x00 |
#define | LTC2305_SINGLE_ENDED_MODE 0x80 |
#define | LTC2305_DIFFERENTIAL_MODE 0x00 |
#define | LTC2305_P0_N1 0x00 |
#define | LTC2305_P1_N0 0x40 |
#define | LTC2301 1 |
#define | LTC2305 0 |
float LTC2305_code_to_voltage | ( | uint16_t | adc_code, |
float | LTC2305_vref, | ||
uint8_t | uni_bipolar | ||
) |
Calculates the LTC2305 input voltage.
adc_code | Code read from ADC |
LTC2305_vref | LSB value (volts) |
Definition at line 103 of file LTC2305.cpp.
int8_t LTC2305_read | ( | uint8_t | i2c_address, |
uint8_t | adc_command, | ||
uint16_t * | ptr_adc_code | ||
) |
Reads 12-bit code from LTC2305, 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 86 of file LTC2305.cpp.