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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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LTC4261: Negative Voltage Hot Swap Controller with ADC and I2C Monitoring. More...
LTC4261: Negative Voltage Hot Swap Controller with ADC and I2C Monitoring.
The LTC4261/LTC4261-2 negative voltage Hot SwapTM controller allows a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, the board supply voltage can be ramped at an adjustable rate. The devices feature independently adjustable inrush current and overcurrent limits to minimize stresses on the pass transistor during start-up, input step and output short conditions. The LTC4261 defaults to latch-off while the LTC4261-2 defaults to auto-retry on overcurrent faults. I2C DATA FORMAT (MSB FIRST): Data Out: Byte #1 Byte #2 Byte #3 START SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK C7 C6 C5 C4 C3 C2 C1 C0 SACK D7 D6 D5 D4 D3 D2 D1 D0 SACK STOP Data In: Byte #1 Byte #2 Byte #3 START SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK C7 C6 C5 C4 C3 C2 C1 C0 SACK Repeat Start SA6 SA5 SA4 SA3 SA2 SA1 SA0 R SACK Byte #4 Byte #5 MSB LSB D15 D14 D13 D12 D11 D10 D9 D8 MACK D7 D6 D5 D4 D3 D2 D1 D0 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 Example Code: Read ADIN and Current Values ack |= LTC4261_read_10_bits(LTC4261_I2C_Address, LTC4261_SENSE_MSB_REG, ¤t_code); // reads current sense ADC ack |= LTC4261_read_10_bits(LTC4261_I2C_Address, LTC4261_ADIN_MSB_REG, &adin_code); // reads ADIN ADC ack |= LTC4261_read_10_bits(LTC4261_I2C_Address, LTC4261_ADIN2_MSB_REG, &adin2_code); // reads ADIN2 ADC //convert codes to voltage and current values current = LTC4261_code_to_current(current_code, resitor, current_lsb); adin_voltage = LTC4261_ADIN_code_to_voltage(adin_code, adin_lsb, resisive_ratio); adin2_voltage = LTC4261_ADIN_code_to_voltage(adin2_code, adin_lsb, resisive_ratio);
http://www.linear.com/product/LTC4261
http://www.linear.com/product/LTC4261#demoboards
Copyright 2018(c) Analog Devices, Inc.
All rights reserved.
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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 LTC4261: Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring
Definition in file LTC4261.h.
Go to the source code of this file.
Functions | |
int8_t | LTC4261_write (uint8_t i2c_address, uint8_t command, uint8_t code) |
Write an 8-bit code to the LTC4261. More... | |
int8_t | LTC4261_read (uint8_t i2c_address, uint8_t command, uint8_t *code) |
Reads an 8-bit adc_code from LTC4261. More... | |
int8_t | LTC4261_read_10_bits (uint8_t i2c_address, uint8_t adc_command, uint16_t *adc_code) |
Reads a 10-bit adc_code from LTC4261. More... | |
int8_t | LTC4261_ARA (uint8_t alert_response_address, uint8_t *i2c_address) |
SMBus Alert Response Protocol: Sends an alert response command and releases /ALERT pin. More... | |
float | LTC4261_ADIN_code_to_voltage (uint16_t adc_code, float LTC4261_ADIN_lsb, float resistor_divider_ratio) |
Calculate the LTC4261 ADIN voltage. More... | |
float | LTC4261_code_to_current (uint16_t adc_code, float resistor, float LTC4261_DELTA_SENSE_lsb) |
Calculate the LTC4261 current with a sense resistor. More... | |
float LTC4261_ADIN_code_to_voltage | ( | uint16_t | adc_code, |
float | LTC4261_ADIN_lsb, | ||
float | resistor_divider_ratio | ||
) |
Calculate the LTC4261 ADIN voltage.
adc_code | The ADC value |
LTC4261_ADIN_lsb | ADIN lsb weight |
resistor_divider_ratio | the ratio that the voltages have been divided down |
Definition at line 110 of file LTC4261.cpp.
int8_t LTC4261_ARA | ( | uint8_t | alert_response_address, |
uint8_t * | i2c_address | ||
) |
SMBus Alert Response Protocol: Sends an alert response command and releases /ALERT pin.
LTC4261 responds with its address
alert_response_address | the Alert Response Address on the I2C bus |
i2c_address | the address of the alert source |
Definition at line 102 of file LTC4261.cpp.
float LTC4261_code_to_current | ( | uint16_t | adc_code, |
float | resistor, | ||
float | LTC4261_DELTA_SENSE_lsb | ||
) |
Calculate the LTC4261 current with a sense resistor.
adc_code | The ADC value |
resistor | The resistor value |
LTC4261_DELTA_SENSE_lsb | Delta sense lsb weight |
Definition at line 119 of file LTC4261.cpp.
int8_t LTC4261_read | ( | uint8_t | i2c_address, |
uint8_t | command, | ||
uint8_t * | code | ||
) |
Reads an 8-bit adc_code from LTC4261.
i2c_address | I2C Address for the LTC4261 |
command | The "command byte" for the LTC4261 that corresponds to register address |
code | Value that will be read from the register |
Definition at line 82 of file LTC4261.cpp.
int8_t LTC4261_read_10_bits | ( | uint8_t | i2c_address, |
uint8_t | adc_command, | ||
uint16_t * | adc_code | ||
) |
Reads a 10-bit adc_code from LTC4261.
i2c_address | I2C Address for the LTC4261 |
adc_command | The "command byte" for the LTC4261 that corresponds to register address |
adc_code | Value that will be read from the register. |
Definition at line 91 of file LTC4261.cpp.
int8_t LTC4261_write | ( | uint8_t | i2c_address, |
uint8_t | command, | ||
uint8_t | code | ||
) |
Write an 8-bit code to the LTC4261.
i2c_address | I2C Address for the LTC4261 |
command | The "command byte" for the LTC4261 that corresponds to register address |
code | Value that will be written to the register |
Definition at line 73 of file LTC4261.cpp.