گروه فنی مهندسی آرکام

-- DS18B20: Programmable Resolution 1-Wire Digital Thermometer

--

-- The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature

-- measurements and has an alarm function with nonvolatile user-programmable upper

-- and lower trigger points.

--

-- Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to

-- function on the same 1-Wire bus.

--

-- The temperature data is stored as a 16bit sign-extended two’s complement number

-- in the temperature register. The sign bits (S) indicate if the temperature is

-- positive or negative: for positive numbers S = 0 and for negative numbers S = 1.

--==============================================================================--

library IEEE;

    use IEEE.STD_LOGIC_1164.ALL;

    use IEEE.STD_LOGIC_ARITH.ALL;

    USE IEEE.NUMERIC_STD.ALL;

    use IEEE.STD_LOGIC_UNSIGNED.ALL;

--==============================================================================--

entity DS18B20 is

    port

    (

        CLK                     : IN     STD_LOGIC;

----------------------------------------------------------------------------------

        SENSOR_ADD_RECEIVED     : OUT    STD_LOGIC_VECTOR(64-1 DOWNTO 0);

        TEMP                    : OUT    STD_LOGIC_VECTOR(16-1 DOWNTO 0);

----------------------------------------------------------------------------------

        -- Data Input/Output. Open-drain 1-Wire interface pin.

        TEMP_SENSOR_DIO         : INOUT  STD_LOGIC;

----------------------------------------------------------------------------------

        test_sensor             : OUT    STD_LOGIC;

    );

end DS18B20;

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