MAX6633(2001) View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX6633
(Rev.:2001)

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

Maxim Integrated 

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 consecu-

tive 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 conver-

sions. 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-toler-

ance counts. Additionally, the fault queue automatically

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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