參數(shù)資料
型號: DS1620R
廠商: DALLAS SEMICONDUCTOR
元件分類: Switch/Digital Output Temperature Sensor
英文描述: DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), RECTANGULAR, SURFACE MOUNT
封裝: 0.300 INCH, SO-16
文件頁數(shù): 8/11頁
文件大?。?/td> 17247K
代理商: DS1620R
DS1620R
6 of 11
102099
3–WIRE COMMUNICATIONS
The 3–wire bus is comprised of three signals. These are the RST (reset) signal, the CLK (clock) signal,
and the DQ (data) signal. All data transfers are initiated by driving the RST input high. Driving the RST
input low terminates communication. (See Figures 3 and 4.)
A clock cycle is a sequence of a falling edge followed by a rising edge. For data inputs, the data must be
valid during the rising edge of a clock cycle. Command bits and data bits are output on the falling edge of
the clock and remain valid through the rising edge.
When reading data from the DS1620R, the DQ pin goes to a high impedance state while the clock is high.
Taking RST low will terminate any communication and cause the DQ pin to go to a high impedance
state.
Data over the 3–wire interface is communicated LSB first.
The command set for the 3–wire interface as shown in Table 3 is as follows:
Read Temperature [AAh]
This command reads the contents of the register which contains the last temperature conversion result.
The next nine clock cycles will output the contents of this register.
Write TH [01h]
This command writes to the TH (HIGH TEMPERATURE) register. After issuing this command the next
9 clock cycles clock in the 9–bit temperature limit which will set the threshold for operation of the THIGH
output.
Write TL [02h]
This command writes to the TL (LOW TEMPERATURE) register. After issuing this command the next
nine clock cycles clock in the 9–bit temperature limit which will set the threshold for operation of the
TLOW output.
Read TH [A1h]
This command reads the value of the TH (HIGH TEMPERATURE) register. After issuing this command
the next nine clock cycles clock out the 9–bit temperature limit which sets the threshold for operation of
the THIGH output.
Read TL [A2h]
This command reads the value of the TL (LOW TEMPERATURE) register. After issuing this command
the next nine clock cycles clock out the 9–bit temperature limit which sets the threshold for operation of
the TLOW output.
Start Convert T [EEh]
This command begins a temperature conversion. No further data is required. In one–shot mode the
temperature conversion will be performed and then the DS1620R will remain idle. In continuous mode
this command will initiate continuous conversions.
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PDF描述
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