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README.md 0.1.2 LTC2991 2021-12-20 20:24:00 +01:00

README.md

Arduino CI Arduino-lint JSON check License: MIT GitHub release

LTC2991

Arduino library for an LTC2991 temperature and voltage control IC.

Description

Experimental - not tested myself, (no hardware)

LTC2991 is an experimental library for the LTC2991 IC which is typically used to monitor temperature and voltage. It also has a PWM out to control e.g. a fan.

The IC supports normal voltage measurement (8 lines), differential voltage measurements (4 pairs) and temperature measurements (4 pairs). These can be combined in a mix. As the IC has only 8 inputs available one has to choose what.

Read the datasheet for the details.

Interface

Constructor and setup

  • LTC2991(const uint8_t address, TwoWire *wire = Wire)
  • bool begin(const uint8_t sda, const uint8_t scl) for ESP32 and ESP8266; initializes the class. sets I2C pins. returns true if the LTC2991 address is on the I2C bus.
  • bool begin() UNO ea. initializes the class. returns true if the LTC2991 address is on the I2C bus.
  • bool isConnected() returns true if the LTC2991 address is on the I2C bus.

Status functions

  • bool new_data(uint8_t channel) true if there is a new external measurement (temperature or voltage) available.
  • bool new_temperature() true if there is a new internal temperature measurement available.
  • bool new_voltage() true, if there is a new internal voltage measurement available.
  • bool is_busy() true if converting...

External measurements

The following functions work on pairs

n selected
1 V1 V2 T1
2 V3 V4 T2
3 V5 V6 T3
4 V7 V8 T4
  • void trigger_conversion(uint8_t n) wrapper around enable(n, true), better naming.
  • void trigger_conversion_all() triggers conversions for all 4 channels/pairs.
  • void enable(uint8_t n, bool enable) enable or disable an external line. disable can be used to stop the repeat mode.
  • bool is_enabled(uint8_t n) idem
  • void enable_filter(uint8_t n, bool enable) enable filter - not investigated.
  • bool is_enabled_filter(uint8_t n) idem.
  • void set_Kelvin(uint8_t n) sets temperature mode to Kelvin, implicit set_mode_temperature().
  • void set_Celsius(uint8_t n) sets temperature mode to Celsius, implicit set_mode_temperature.
  • void set_temp_scale(uint8_t n, bool Kelvin = true) used to switch between Kelvin and Celsius.
  • char get_temp_scale(uint8_t n) returns 'K' or 'C'.
  • void set_mode_temperature(uint8_t n) sets operational mode.
  • void set_mode_voltage_differential(uint8_t n) sets operational mode.
  • void set_mode_voltage_normal(uint8_t n) sets operational mode.
  • uint8_t get_operational_mode(uint8_t n) returns operational mode.
  • uint8_t get_differential_mode(uint8_t n) returns differential flag.
  • float get_value(uint8_t channel) channel = 1..8; depending on the operational mode it returns the temperature or the (differential) voltage.

Internal measurements

  • void enable_Tintern_Vcc(bool enable) enable internal temperature measurements.
  • bool is_enabled_Tintern_Vcc() idem.
  • void enable_filter_Tintern(bool enable) enable filter - not investigated
  • bool is_enabled_filter_Tintern()
  • void set_Kelvin_Tintern() use Kelvin.
  • void set_Celsius_Tintern() use Celsius.
  • void set_temp_scale_Tintern(bool Kelvin = true) Obsolete?.
  • char get_temp_scale_Tintern() returns 'K' or 'C'.
  • float get_Tintern() returns internal temperature.
  • float get_VCC() returns the internal voltage.

Configuration

  • void set_acquisition_repeat() set continuous measurement mode.
  • void set_acquisition_single() set single shot mode. Note that before a measurement one needs to call trigger_conversion();
  • uint8_t get_acquisition_mode() return mode set (0,1)

PWM functions

  • void set_PWM(uint16_t value = 0) value is 0..511
  • void set_PWM(uint16_t value = 0) value is 0..511, less resolution (256 steps)
  • uint16_t get_PWM() returns the value from the PWM register, when using PWM_fast this can differ 1.
  • void invert_PWM(bool invert) idem.
  • bool is_inverted_PWM() idem.
  • void enable_PWM(bool enable) idem.
  • bool is_enabled_PWM() idem.

Performance

No data available yet. To be measured when hardware is available...

Operational

See examples..

Future

must

  • get hardware to
  • test test test
  • update documentation

could

  • cache registers (which) or
  • cache a number of flags to speed up retrieving data
  • optimize multi-byte read / write
  • add Fahrenheit
    • do low level in Kelvin and convert to KFC as needed.
    • would simplify get_value
    • need an enum
  • look for code optimizations