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LM77 データシート(PDF) 10 Page - Texas Instruments

部品番号 LM77
部品情報  9-Bit Sign Digital Temperature Sensor
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LM77
SNIS103F – JUNE 1999 – REVISED MARCH 2013
www.ti.com
SHUTDOWN MODE
Shutdown mode is enabled by setting the shutdown bit in the Configuration register via the Serial Bus. Shutdown
mode reduces power supply current to 5
μA typical. T_CRIT_A is reset if previously set. Since conversions are
stoped during shutdown, T_CRIT_A and INT will not be operational. The Serial Bus interface remains active.
Activity on the clock and data lines of the Serial Bus may slightly increase shutdown mode quiescent current.
Registers can be read from and written to in shutdown mode. The LM77 takes miliseconds to respond to the
shutdown command.
INT AND T_CRIT_A OUTPUT
The INT and T_CRIT_A outputs are open-drain outputs and do not have internal pull-ups. A "high" level will not
be observed on these pins until pull-up current is provided from some external source, typically a pull-up resistor.
Choice of resistor value depends on many system factors but, in general, the pull-up resistor should be as large
as possible. This will minimize any errors due to internal heating of the LM77. The maximum allowable resistance
of the pull up resistor is 90K Ohms based on the Logic “1” Output Leakage Current and a 2 volt high output level.
FAULT QUEUE
A fault queue of up to 4 faults is provided to prevent false tripping when the LM77 is used in noisy environments.
The 4 faults must occur consecutively to set flags as well as INT and T_CRIT_A outputs. The fault queue is
enabled by setting bit 4 of the Configuration Register high (see Table 3).
INTERNAL REGISTER STRUCTURE
Figure 8.
The data registers in the LM77 are selected by the Pointer register. At power-up the Pointer is set to “00”; the
location for the Temperature Register. The Pointer register latches the last location it was set to. In Comparator
Interrupt Mode, a read from the LM77 resets the INT output. Placing the device in Shutdown mode resets the
INT and T_CRIT_A outputs. All registers are read and write, except the Temperature register which is read only.
A write to the LM77 will always include the address byte and the Pointer byte. A write to the Configuration
register requires one data byte, while the TLOW, THIGH, and T_CRIT registers require two data bytes.
10
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