DS1722U/T&R datasheet, PDF - EEWORLD Datasheet

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DS1722U/T&R: DescriptionIC thermometer dig 3-wire 8-usop; CategoryThe sensor Sensor/transducer; File Size327KB，14 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1722U/T&R Overview

IC thermometer dig 3-wire 8-usop

DS1722U/T&R Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Maker	Maxim
package instruction	MICRO MAX, SOIC-8
Reach Compliance Code	not_compliant
ECCN code	EAR99
Maximum accuracy (Celsius)	2 Cel
Other features	ALSO REQUIRES 1.8V-5.5V DIGITAL SUPPLY
body width	3 mm
body height	1.1 mm
Body length or diameter	3 mm
shell	PLASTIC
JESD-609 code	e0
Installation features	SURFACE MOUNT
Number of digits	12
Number of terminals	8
Maximum working current	0.5 mA
Maximum operating temperature	125 °C
Minimum operating temperature	-55 °C
Output interface type	3-WIRE INTERFACE
Package body material	PLASTIC/EPOXY
Encapsulate equivalent code	TSSOP8,.19
Package Shape/Form	RECTANGULAR
power supply	2/5,3/5 V
Sensor/Transducer Type	TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL
Maximum supply voltage	5.5 V
Minimum supply voltage	2.65 V
surface mount	YES
Terminal surface	Tin/Lead (Sn/Pb)
Termination type	SOLDER
Base Number Matches	1

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DS1722

Digital Thermometer with

SPI/3-Wire Interface

www.maxim-ic.com

FEATURES

Temperature Measurements Require No

External Components

Measures Temperatures from -55°C to

+120°C. Fahrenheit Equivalent is -67°F to

+248°F

Thermometer Accuracy is

±2.0°C

Thermometer Resolution is Configurable

from 8 to 12 bits (1.0°C to 0.0625°C

Resolution)

Data is Read From/Written to Via a Motorola

Serial Peripheral Interface (SPI) or Standard

3-Wire Serial Interface

Wide Analog Power Supply Range (2.65V -

5.5V)

Separate Digital Supply Allows for 1.8V

Logic

Available in an 8-Pin SO (150mil) and 8-Pin

μMAX

package

DDD

SCLK

GND

PIN ASSIGNMENT

DDA

SERMODE

SDI

SDO

DDD

SCLK

GND

DDA

SERMODE

SDI

SDO

DS1722S

8-Pin SO (150mil)

DS1722U

8-PIN µMAX

PIN DESCRIPTION

SERMODE

SCLK

GND

DDA

SDO

SDI

DDD

- Serial Interface Mode

- Chip Enable

- Serial Clock

- Ground

- Analog Supply Voltage

- Serial Data Out

- Serial Data In

- Digital Supply Voltage

DESCRIPTION

The DS1722 Digital Thermometer and Thermostat with SPI/3-Wire Interface provides temperature

readings which indicate the temperature of the device. No additional components are required; the device

is truly a temperature-to-digital converter. Temperature readings are communicated from the DS1722

over a Motorola SPI interface or a standard 3-wire serial interface. The choice of interface standard is

selectable by the user.

For applications that require greater temperature resolution, the user can adjust the readout resolution

from 8 to 12 bits. This is particularly useful in applications where thermal runaway conditions must be

detected quickly.

For application flexibility, the DS1722 features a wide analog supply rail of 2.65V - 5.5V. A separate

digital supply allows a range of 1.8V to 5.5V.

The DS1722 is available in an 8-pin SO (150mil) and 8-pin

μMAX

package.

Applications for the DS1722 include personal computers/servers/workstations, cellular telephones, office

equipment, or any thermally-sensitive system.

1 of 14

022008

DS1722

OVERVIEW

A block diagram of the DS1722 is shown in Figure 1. The DS1722 consists of four major components:

1. Precision temperature sensor

2. Analog-to-digital converter

3. SPI/3-wire interface electronics

4. Data registers

The factory-calibrated temperature sensor requires no external components. The DS1722 is in a power-

conserving shutdown state upon power-up. After power-up, the user may alter the configuration register

to place the device in a continuous temperature conversion mode or in a one-shot conversion mode. In

the continuous conversion mode, the DS1722 continuously converts the temperature and stores the result

in the temperature register. As conversions are performed in the background, reading the temperature

DS1722 will 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. More

information on the configuration register is contained in the “OPERATION-Programming” section.

The temperature conversion results will have a default resolution of 9 bits. In applications where small

incremental temperature changes are critical, the user can change the conversion resolution from 9 bits to

8, 10, 11, or 12. This is accomplished by programming the configuration register. Each additional bit of

resolution approximately doubles the conversion time.

The DS1722 can communicate using either a Motorola Serial Peripheral Interface (SPI) or standard 3-

wire interface. The user can select either communication standard through the SERMODE pin, tying it to

DDD

for SPI and to ground for 3-wire.

The device contains both an analog supply voltage and a digital supply voltage (V

DDA

and V

DDD

respectively). The analog supply powers the device for operation while the digital supply provides the

top rails for the digital inputs and outputs. The DS1722 was designed to be 1.8V Logic-Ready.

3 of 14

DS1722U/T&R Related Products

	DS1722U/T&R	DS1722X/T&R	DS1722S/T&R	DS1722S-TR	DS1722U-TR	DS1722S/T&R;	DS1722U/T&R;	DS1722X/T&R;	DS1722U+T&R;	DS1722S+T&R;
Description	IC thermometer dig 3-wire 8-usop	IC thermometer dig 3-wire 8fchip	IC thermometer dig 3-wire 8-soic	Board Mount Temperature Sensors	Board Mount Temperature Sensors	SENSOR TEMPERATURE SPI 8SOIC	SENSOR TEMPERATURE SPI 8UMAX	SENSOR TEMPERATURE SPI	SENSOR TEMPERATURE SPI 8UMAX	SENSOR TEMPERATURE SPI 8SOIC

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