DS1722U/TR datasheet, PDF - EEWORLD Datasheet

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DS1722U/TR: DescriptionSensor/Transducer, 8 Pin, Plastic/epoxy,; CategoryThe sensor Sensor/transducer; File Size425KB，14 Pages; ManufacturerDALLAS; Websitehttp://www.dalsemi.com

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DS1722U/TR Overview

Sensor/Transducer, 8 Pin, Plastic/epoxy,

DS1722U/TR Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	DALLAS
Reach Compliance Code	unknown
Installation features	SURFACE MOUNT
Number of terminals	8
Maximum working current	0.5 mA
Maximum operating temperature	120 °C
Minimum operating temperature	-55 °C
Package body material	PLASTIC/EPOXY
Encapsulate equivalent code	TSSOP8,.19
Package Shape/Form	RECTANGULAR
power supply	3/5 V
surface mount	YES
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), 8-Pin

µMAX, and Flip-Chip 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), 8-pin µMAX, and flip-chip package.

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

equipment, or any thermally-sensitive system.

1 of 14

092403

DS1722

OPERATION-Programming

The area of interest in programming the DS1722 is the Configuration register. All programming is done

via the SPI or 3-wire communication interface by selecting the appropriate address of the desired register

location. Table 4 illustrates the addresses for the two registers (configuration and temperature) of the

DS1722.

Table 4

Read Address

00h

01h

02h

Write Address

80h

No access

Active Register

Configuration

Temperature LSB

Temperature MSB

CONFIGURATION REGISTER PROGRAMMING

The configuration register is accessed in the DS1722 with the 00h address for reads and the 80h address

for writes. Data is read from or written to the configuration register MSb first for SPI communication and

LSb first for 3-wire communication. The format of the register is illustrated in Figure 2. The effect each

bit has on DS1722 functionality is described below along with the power-up state of the bit. The entire

CONFIGURATION/STATUS REGISTER

Figure 2

MSb

1SHOT

LSb

1SHOT =

One-shot temperature conversion bit. If the SD bit is "1", (continuous temperature

conversions are not taking place), a "1" written to the 1SHOT bit will cause the DS1722 to perform one

temperature conversion and store the results in the temperature register at addresses 01h (LSB) and 02h

(MSB). The bit will clear itself to "0" upon completion of the temperature conversion. The user has

read/write access to the 1SHOT bit, although writes to this bit will be ignored if the SD bit is a "0",

(continuous conversion mode). The power-up default of the one-shot bit is "0".

R0, R1, R2 =

Thermometer resolution bits. Table 5 below defines the resolution of the digital

thermometer, based on the settings of these 3 bits. There is a direct tradeoff between resolution and

conversion time, as depicted in the AC Electrical Characteristics. The user has read/write access to the

R2, R1 and R0 bits and the power-up default state is R2="0", R1="0", and R0="1" (9-bit conversions).

THERMOMETER RESOLUTION CONFIGURATION

Table 5

x=Don’t care.

Thermometer Resolution

8-bit

9-bit

10-bit

11-bit

12-bit

Max Conversion Time

0.075s

0.15s

0.3s

0.6s

1.2s

SD =

Shutdown bit. If SD is "0", the DS1722 will continuously perform temperature conversions and

store the last completed result in the temperature register. If SD is changed to a "1", the conversion in

progress will be completed and stored and then the device will revert to a low-power shutdown mode.

5 of 14

DS1722U/TR Related Products

	DS1722U/TR	DS1722U+TR	DS1722U+	DS1722S/T&R	DS1722X/TR
Description	Sensor/Transducer, 8 Pin, Plastic/epoxy,	Sensor/Transducer, 8 Pin, Plastic/epoxy,	Sensor/Transducer, 8 Pin, Plastic/epoxy,	Serial Switch/Digital Sensor, 12 Bit(s), 2Cel, Rectangular, 8 Pin, Surface Mount, 0.150 INCH, SOIC-8	Sensor/Transducer, Plastic/epoxy,
Is it Rohs certified?	incompatible	conform to	conform to	incompatible	incompatible
Reach Compliance Code	unknown	unknown	unknown	unknown	unknown
Maximum working current	0.5 mA	0.5 mA	0.5 mA	0.5 mA	0.5 mA
Maximum operating temperature	120 °C	120 °C	120 °C	120 °C	120 °C
Minimum operating temperature	-55 °C	-55 °C	-55 °C	-55 °C	-55 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
Encapsulate equivalent code	TSSOP8,.19	TSSOP8,.19	TSSOP8,.19	SOP8,.25	FLIP CHIP
power supply	3/5 V	3/5 V	3/5 V	3/5 V	3/5 V
Maker	DALLAS	DALLAS	DALLAS	-	DALLAS
Installation features	SURFACE MOUNT	SURFACE MOUNT	SURFACE MOUNT	SURFACE MOUNT	-
Number of terminals	8	8	8	8	-
Package Shape/Form	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	-
surface mount	YES	YES	YES	YES	-
Base Number Matches	1	1	1	1	-

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