MAX31723MUA+【PDF 7/15 页】IC THERMOMETER/STAT SPI-3W 8UMAX

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Digital Thermometers and Thermostats

with SPI/3-Wire Interface

Detailed Description

The MAX31722/MAX31723 are factory-calibrated tem-

perature sensors that require no external components.

The user can alter the configuration/status register to

place the device in a continuous temperature conversion

mode or into a one-shot conversion mode. In the continu-

ous conversion mode, the devices continuously convert

the temperature and store the result in the temperature

ground, reading the temperature register does not affect

the conversion in progress. In the one-shot temperature

conversion mode, the devices perform one temperature

conversion, store the result in the temperature register,

and then return to the shutdown state. This conversion

mode is ideal for power-sensitive applications. The

temperature conversion results have a default resolution

of 9 bits. In applications where small incremental tem-

perature changes are critical, the user can change the

conversion resolution from 9 bits to 10, 11, or 12. This is

accomplished by programming the configuration/status

The devices can be configured as a thermostat, allow-

ing for the TOUT pin to behave as an interrupt, trigger-

ing when the programmed limits, T

HIGH

and T

LOW

, are

surpassed. The devices can communicate using either a

serial peripheral interface (SPI) or standard 3-wire inter-

face. The user can select either communication standard

through the SERMODE pin, connecting it to V

for SPI

and to GND for 3-wire.

Pin Configuration

Pin Description

礛AX

7 SERMODE

8 V

TOUT

SDI

SCLK 3

SDO

GND 4

MAX31722

MAX31723

TOP VIEW

NAME

FUNCTION

TOUT

Thermostat Output. Open-drain output indicator for internal thermal alarm limits.

Chip Enable. Must be asserted high for communication to take place for either the SPI or 3-wire

interfaces.

SCLK

Serial-Clock Input. Used to synchronize data movement on the serial interface for either SPI or

3-wire interfaces.

GND

Ground. Ground connection.

SDO

Serial-Data Output. When SPI communication is selected, the SDO pin is the serial-data output for

the SPI bus. When 3-wire communication is selected, this pin must be connected to the SDI pin.

The SDI and SDO pins function as a single I/O pin when connected together.

SDI

Serial-Data Input. When SPI communication is selected, the SDI pin is the serial-data input for the

SPI bus. When 3-wire communication is selected, this pin must be connected to the SDO pin. The

SDI and SDO pins function as a single I/O pin when connected together.

SERMODE

Serial-Interface Mode Input. This pin selects which interface is used. When connected to V

, SPI

communication is selected. When connected to GND, 3-wire communication is selected.

Supply Voltage. Power-supply input.

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