Package com.dalsemi.onewire.container

Class OneWireContainer28

java.lang.Object
com.dalsemi.onewire.container.OneWireContainer
com.dalsemi.onewire.container.OneWireContainer28
All Implemented Interfaces:
OneWireSensor, TemperatureContainer
Direct Known Subclasses:
OneWireContainer22
public class OneWireContainer28 extends OneWireContainer implements TemperatureContainer

1-Wire container for temperature iButton which measures temperatures from -55@htmlonly &#176C @endhtmlonly to +125@htmlonly &#176C @endhtmlonly, DS18B20. This container encapsulates the functionality of the iButton family type 28 (hex)

Features

  • Measures temperatures from -55@htmlonly &#176C @endhtmlonly to +125@htmlonly &#176C @endhtmlonly. Fahrenheit equivalent is -67@htmlonly &#176F @endhtmlonly to +257@htmlonly &#176F @endhtmlonly
  • Power supply range is 3.0V to 5.5V
  • Zero standby power
  • +/- 0.5@htmlonly &#176C @endhtmlonly accuracy from -10@htmlonly &#176C @endhtmlonly to +85@htmlonly &#176C @endhtmlonly
  • Thermometer resolution programmable from 9 to 12 bits
  • Converts 12-bit temperature to digital word in 750 ms (max.)
  • User-definable, nonvolatile temperature alarm settings
  • Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)

Usage

See the usage example in TemperatureContainer for temperature specific operations.

DataSheet

http://pdfserv.maxim-ic.com/arpdf/DS18B20.pdf
See Also:

  • Field Details

    • WRITE_SCRATCHPAD_COMMAND

      public static final byte WRITE_SCRATCHPAD_COMMAND
      DS18B20 writes data to scratchpad command
      See Also:

    • READ_SCRATCHPAD_COMMAND

      public static final byte READ_SCRATCHPAD_COMMAND
      DS18B20 reads data from scratchpad command
      See Also:

    • COPY_SCRATCHPAD_COMMAND

      public static final byte COPY_SCRATCHPAD_COMMAND
      DS18B20 copies data from scratchpad to E-squared memory command
      See Also:

    • CONVERT_TEMPERATURE_COMMAND

      public static final byte CONVERT_TEMPERATURE_COMMAND
      DS18B20 converts temperature command
      See Also:

    • RECALL_E2MEMORY_COMMAND

      public static final byte RECALL_E2MEMORY_COMMAND
      DS18B20 recalls E-squared memory command
      See Also:

    • READ_POWER_SUPPLY_COMMAND

      public static final byte READ_POWER_SUPPLY_COMMAND
      DS18B20 reads power supply command. This command is used to determine if external power is supplied.
      See Also:

    • RESOLUTION_12_BIT

      public static final byte RESOLUTION_12_BIT
      DS18B20 12-bit resolution constant for CONFIG byte
      See Also:

    • RESOLUTION_11_BIT

      public static final byte RESOLUTION_11_BIT
      DS18B20 11-bit resolution constant for CONFIG byte
      See Also:

    • RESOLUTION_10_BIT

      public static final byte RESOLUTION_10_BIT
      DS18B20 10-bit resolution constant for CONFIG byte
      See Also:

    • RESOLUTION_9_BIT

      public static final byte RESOLUTION_9_BIT
      DS18B20 9-bit resolution constant for CONFIG byte
      See Also:

  • Constructor Details

  • Method Details

    • getName

      public String getName()
      Retrieves the Maxim Integrated Products part number of this OneWireContainer28 as a String. For example 'DS18B20'.
      Overrides:
      getName in class OneWireContainer
      Returns:
      this OneWireContainer28 name

    • getAlternateNames

      public String getAlternateNames()
      Retrieves the alternate Maxim Integrated Products part numbers or names. A 'family' of 1-Wire Network devices may have more than one part number depending on packaging. There can also be nicknames such as 'Crypto iButton'.
      Overrides:
      getAlternateNames in class OneWireContainer
      Returns:
      this OneWireContainer28 alternate names

    • getDescription

      public String getDescription()
      Retrieves a short description of the function of this OneWireContainer28 type.
      Overrides:
      getDescription in class OneWireContainer
      Returns:
      OneWireContainer28 functional description

    • hasTemperatureAlarms

      public boolean hasTemperatureAlarms()
      Checks to see if this temperature measuring device has high/low trip alarms.
      Specified by:
      hasTemperatureAlarms in interface TemperatureContainer
      Returns:
      true if this OneWireContainer28 has high/low trip alarms
      See Also:

    • hasSelectableTemperatureResolution

      public boolean hasSelectableTemperatureResolution()
      Checks to see if this device has selectable temperature resolution.
      Specified by:
      hasSelectableTemperatureResolution in interface TemperatureContainer
      Returns:
      true if this OneWireContainer28 has selectable temperature resolution
      See Also:

    • getTemperatureResolutions

      public double[] getTemperatureResolutions()
      Gets an array of available temperature resolutions in Celsius.
      Specified by:
      getTemperatureResolutions in interface TemperatureContainer
      Returns:
      byte array of available temperature resolutions in Celsius for this OneWireContainer28. The minimum resolution is returned as the first element and maximum resolution as the last element.
      See Also:

    • getTemperatureAlarmResolution

      public double getTemperatureAlarmResolution()
      Gets the temperature alarm resolution in Celsius.
      Specified by:
      getTemperatureAlarmResolution in interface TemperatureContainer
      Returns:
      temperature alarm resolution in Celsius for this OneWireContainer28
      See Also:

    • getMaxTemperature

      public double getMaxTemperature()
      Gets the maximum temperature in Celsius.
      Specified by:
      getMaxTemperature in interface TemperatureContainer
      Returns:
      maximum temperature in Celsius for this OneWireContainer28
      See Also:

    • getMinTemperature

      public double getMinTemperature()
      Gets the minimum temperature in Celsius.
      Specified by:
      getMinTemperature in interface TemperatureContainer
      Returns:
      minimum temperature in Celsius for this OneWireContainer28
      See Also:

    • doTemperatureConvert

      public void doTemperatureConvert(byte[] state) throws OneWireIOException, OneWireException
      Performs a temperature conversion on state information.
      Specified by:
      doTemperatureConvert in interface TemperatureContainer
      Parameters:
      state - byte array with device state information
      Throws:
      OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.
      OneWireException - on a communication or setup error with the 1-Wire adapter
      See Also:

    • getTemperature

      public double getTemperature(byte[] state) throws OneWireIOException
      Gets the temperature value in Celsius from the state data retrieved from the readDevice() method.
      Specified by:
      getTemperature in interface TemperatureContainer
      Parameters:
      state - byte array with device state information for this OneWireContainer28
      Returns:
      temperature in Celsius from the last doTemperatureConvert()
      Throws:
      OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.
      See Also:

    • getTemperatureAlarm

      public double getTemperatureAlarm(int alarmType, byte[] state)
      Gets the specified temperature alarm value in Celsius from the state data retrieved from the readDevice() method.
      Specified by:
      getTemperatureAlarm in interface TemperatureContainer
      Parameters:
      alarmType - valid value: ALARM_HIGH or ALARM_LOW
      state - byte array with device state information
      Returns:
      temperature alarm trip values in Celsius for this OneWireContainer28
      See Also:

    • getTemperatureResolution

      public double getTemperatureResolution(byte[] state)
      Gets the current temperature resolution in Celsius from the state data retrieved from the readDevice() method.
      Specified by:
      getTemperatureResolution in interface TemperatureContainer
      Parameters:
      state - byte array with device state information
      Returns:
      temperature resolution in Celsius for this OneWireContainer28
      See Also:

    • setTemperatureAlarm

      public void setTemperatureAlarm(int alarmType, double alarmValue, byte[] state) throws OneWireException, OneWireIOException
      Sets the temperature alarm value in Celsius in the provided state data. Use the method writeDevice() with this data to finalize the change to the device.
      Specified by:
      setTemperatureAlarm in interface TemperatureContainer
      Parameters:
      alarmType - valid value: ALARM_HIGH or ALARM_LOW
      alarmValue - alarm trip value in Celsius
      state - byte array with device state information
      Throws:
      OneWireException - Device does not support temperature alarms
      OneWireIOException
      See Also:

    • setTemperatureResolution

      public void setTemperatureResolution(double resolution, byte[] state) throws OneWireException
      Sets the current temperature resolution in Celsius in the provided state data. Use the method writeDevice() with this data to finalize the change to the device.
      Specified by:
      setTemperatureResolution in interface TemperatureContainer
      Parameters:
      resolution - temperature resolution in Celsius. Valid values are RESOLUTION_9_BIT, RESOLUTION_10_BIT, RESOLUTION_11_BIT and RESOLUTION_12_BIT.
      state - byte array with device state information
      Throws:
      OneWireException - Device does not support selectable temperature resolution
      See Also:

    • readDevice

      public byte[] readDevice() throws OneWireIOException, OneWireException
      Retrieves this OneWireContainer28 state information. The state information is returned as a byte array. Pass this byte array to the 'get' and 'set' methods. If the device state needs to be changed, then call the writeDevice() to finalize the changes.
      Specified by:
      readDevice in interface OneWireSensor
      Returns:
      OneWireContainer28 state information. Device state looks like this: 
         0 : temperature LSB
   1 : temperature MSB
   2 : trip high
   3 : trip low
   4 : configuration register (for resolution)
   5 : reserved
   6 : reserved
   7 : reserved
   8 : an 8 bit CRC of the previous 8 bytes
      Throws:
      OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.
      OneWireException - on a communication or setup error with the 1-Wire adapter
      See Also:

    • writeDevice

      public void writeDevice(byte[] state) throws OneWireIOException, OneWireException
      Writes to this OneWireContainer28 state information that have been changed by 'set' methods. Only the state registers that changed are updated. This is done by referencing a field information appended to the state data.
      Specified by:
      writeDevice in interface OneWireSensor
      Parameters:
      state - byte array with device state information
      Throws:
      OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.
      OneWireException - on a communication or setup error with the 1-Wire adapter
      See Also:

    • readScratchpad

      public byte[] readScratchpad() throws OneWireIOException, OneWireException
      Reads the Scratchpad of the DS18B20.
      Returns:
      9-byte buffer representing the scratchpad
      Throws:
      OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.
      OneWireException - on a communication or setup error with the 1-Wire adapter

    • writeScratchpad

      public void writeScratchpad(byte[] data) throws OneWireIOException, OneWireException
      Writes to the Scratchpad of the DS18B20.
      Parameters:
      data - data to be written to the scratchpad. First byte of data must be the temperature High Trip Point, the second byte must be the temperature Low Trip Point, and the third must be the Resolution (configuration register).
      Throws:
      OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.
      OneWireException - on a communication or setup error with the 1-Wire adapter
      IllegalArgumentException - when data is of invalid length

    • copyScratchpad

      public void copyScratchpad() throws OneWireIOException, OneWireException
      Copies the Scratchpad to the E-squared memory of the DS18B20.
      Throws:
      OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.
      OneWireException - on a communication or setup error with the 1-Wire adapter

    • recallE2

      public byte[] recallE2() throws OneWireIOException, OneWireException
      Recalls the DS18B20 temperature trigger values (ALARM_HIGH and ALARM_LOW) and the configuration register to the scratchpad and reads the scratchpad.
      Returns:
      byte array representing data in the device's scratchpad.
      Throws:
      OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.
      OneWireException - on a communication or setup error with the 1-Wire adapter

    • isExternalPowerSupplied

      public boolean isExternalPowerSupplied() throws OneWireIOException, OneWireException
      Reads the way power is supplied to the DS18B20.
      Returns:
      true for external power,
      false for parasite power
      Throws:
      OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from this OneWireContainer28. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.
      OneWireException - on a communication or setup error with the 1-Wire adapter