MAX6634 データシートの表示（PDF） - Maxim Integrated

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MAX6634

12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface

Maxim Integrated 

MAX6633/MAX6634/

MAX6635

12-Bit Plus Sign Temperature Sensors

with SMBus/I2C-Compatible Serial Interface

TMAX

TMAX - THYST

THIGH

THIGH - THYST

TLOW + THYST

TLOW

ALERT

COMPARATOR MODE

ALERT

INTERRUPT MODE

OVERT

COMPARATOR MODE

ONLY

*

*

*

*

*

*IN INTERRUPT MODE, READING THE DEVICE CLEARS ALERT.

OTHERWISE, IT WOULD REMAIN LOW INDEFINITELY UNTIL CLEARED.

Figure 9. Alarm Output and Reset Diagram

bit. Registers THIGH and TLOW are 16 bits, read/write,

and contain values that trigger ALERT and OVERT.

Register THYST is 16 bits, read/write, and contains

the values by which the temperature must rise or fall

beyond THIGH, TLOW, or TMAX, before ALERT or

OVERT deassert.

Temperature Conversion

An on-chip bandgap reference produces a signal pro-

portional to absolute temperature (PTAT), as well as the

temperature-stable reference voltage necessary for the

analog-to-digital conversion. The PTAT signal is digi-

tized by the on-board ADC to a resolution of 0.0625°C.

The resulting digital value is placed in the Temperature

register. The temperature conversion runs continuously

and asynchronously from the serial interface at a rate of

500ms per conversion. When the Temperature register

is read, the conversion in progress is aborted. The bus

transaction is completed by a stop condition.

Fault Queue (MAX6634/MAX6635)

A programmable fault queue on the MAX6634/MAX6635

eliminates spurious alarm activity in noisy environments.

The queue sets the number of consecutive out-of-tolerance

temperature readings that must occur before the ALERT

or OVERT alarm outputs are toggled. An out-of-tolerance

reading is above THIGH or TMAX or below TLOW. The

fault queue depth defaults to 1 at power-up and may be

programmed—through the configuration register—to four

consecutive conversions. Any time the conversion result

is in tolerance, and the particular alarm output is not

asserted, the queue is cleared, even if it contains some

out-of-tolerance counts. Additionally, the fault queue auto-

matically clears at power-up and in shutdown. Whenever

the fault queue is cleared, the alarm outputs are deassert-

ed. Figure 9 is the alarm output and reset diagram.

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