Maxim Integrated / DS1775_Digitial_Thermometer_Thermostat

C code and C++ library, driver software for Maxim Integrated DS1775, DS75 thermometer and thermostat temperature sensor. Code supports continuous or shut-down/standby, hysteresis, alarm limits, comparator or interrupt mode, fault filtering, and active low/high. Compact 5-pin SOT23 packaging

Dependents:   DS1775_Digital_Thermostat_Temperature

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DS1775 Class Reference
Public Member Functions | Protected Member Functions

DS1775 Class Reference

Digital thermometer, thermostat, temperature sensor. More...

#include <ds1775_cpp.h>

Public Member Functions

 DS1775 (I2C &i2c_bus, uint8_t slave_address)
 Constructor for DS1775 Class.
 ~DS1775 ()
 Default destructor for DS1775 Class.
int read_cfg_reg (uint8_t *value)
 Read register of device at slave address.
int read_reg16 (int16_t *value, char reg)
 Read register of device at slave address.
float read_reg_as_temperature (uint8_t reg)
 Reads the temperature registers.
int write_cfg_reg (uint8_t cfg)
 Writes to the configuration register.
int write_trip_low_thyst (float temperature)
 Writes to the THYST register.
int write_trip_high_tos (float temperature)
 Writes to the TOS register.
float celsius_to_fahrenheit (float temp_c)
 Converts Celsius degrees to Fahrenheit.

Protected Member Functions

int write_reg16 (int16_t value, char reg)
 Write a value to a register.

Detailed Description

Digital thermometer, thermostat, temperature sensor.

Version:
1.0000.0002

The DS1775 reports the device's temperature over the I2C bus. It supports high, low triggers stored in EEPROM for hystersis or limit alarms using comparator or interrupt mode. The DS1775 can operate in shutdown and one-shot mode for extremely low power applications. The software is compatible with the DS75. Five pin SOT23 package Accuracy is +-2.0°C from -55°C to +125°C (-67°F to +257°),

 #include "mbed.h"
 #include "max32630fthr.h"
 #include "ds1775.h"
 #include "USBSerial.h"
 MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3); 
 I2C i2cBus(P3_4, P3_5);
 int main()
 {
     float temperature;
     DigitalOut rLED(LED1, LED_OFF);
     DigitalOut gLED(LED2, LED_OFF);
     DigitalOut bLED(LED3, LED_OFF);
     gLED = LED_ON;
     DS1775 temp_sensor(i2cBus, DS1775_I2C_SLAVE_ADR_R0);
     i2cBus.frequency(400000);
        temperature =
            temp_sensor.read_reg_as_temperature(DS1775_REG_TEMPERATURE);
        printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", 
            temperature, temp_sensor.celsius_to_fahrenheit(temperature));
 }

Definition at line 78 of file ds1775_cpp.h.

Constructor & Destructor Documentation

DS1775 ( I2C &  i2c_bus,
uint8_t  slave_address 
)

Constructor for DS1775 Class.

Allows user to use existing I2C object

On Entry:

Parameters:
[in]i2c_bus- pointer to existing I2C object
[in]i2c_adrs- 7-bit slave address of DS1775

On Exit:

Returns:
None

Definition at line 44 of file ds1775_cpp.cpp.

~DS1775 ( void   )

Default destructor for DS1775 Class.

Destroys I2C object if owner

On Entry:

On Exit:

Returns:
None

empty block

Definition at line 52 of file ds1775_cpp.cpp.

Member Function Documentation

float celsius_to_fahrenheit ( float  temp_c )

Converts Celsius degrees to Fahrenheit.

Parameters:
temp_c- the temperature in Celsius degrees
Returns:
temperature in Celsius degrees

Definition at line 195 of file ds1775_cpp.cpp.

int read_cfg_reg ( uint8_t *  value )

Read register of device at slave address.

Parameters:
[out]value- Read data on success
Returns:
0 on success, negative number on failure

Definition at line 58 of file ds1775_cpp.cpp.

int read_reg16 ( int16_t *  value,
char  reg 
)

Read register of device at slave address.

Parameters:
[out]value- Read data on success
reg- Register address
Returns:
0 on success, negative number on failure

Definition at line 83 of file ds1775_cpp.cpp.

float read_reg_as_temperature ( uint8_t  reg )

Reads the temperature registers.

Parameters:
reg- the address of the temperature register
Returns:
temperature in degrees Celsius

Definition at line 117 of file ds1775_cpp.cpp.

int write_cfg_reg ( uint8_t  cfg )

Writes to the configuration register.

Parameters:
cfg- configurate word
Returns:
0 on success, negative number on failure

Definition at line 160 of file ds1775_cpp.cpp.

int write_reg16 ( int16_t  value,
char  reg 
) [protected]

Write a value to a register.

Parameters:
value- value to write to the register
reg- register address
Returns:
0 on success, negative number on failure

Definition at line 134 of file ds1775_cpp.cpp.

int write_trip_high_tos ( float  temperature )

Writes to the TOS register.

Parameters:
temperature- the temperature in Celsius degrees
Returns:
0 on success, negative number on failure

Definition at line 186 of file ds1775_cpp.cpp.

int write_trip_low_thyst ( float  temperature )

Writes to the THYST register.

Parameters:
temperature- the temperature in Celsius degrees
Returns:
0 on success, negative number on failure

Definition at line 177 of file ds1775_cpp.cpp.

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