DS1821S+

Output Type : Digital
Configuration : Local
Accuracy : +/- 1 C
Temperature Threshold : Programmable
Maximum Operating Temperature : + 125 C
Mounting Style : SMD/SMT
Supply Voltage - Max : 5.5 V
Supply Voltage - Min : 2.7 V
Minimum Operating Temperature : - 55 C
Shutdown : No
Package / Case : SOIC-8
Device Function : Thermometer Thermostat
Digital Output - Bus Interface : 1-Wire


Description

The DS1821S+ is one member of the DS1821 series.The DS1821 can function as a standalone thermostat with user-programmable trip-points or as 8-bit temperature sensor with a 1-Wire digital interface. The thermostat trip-points are stored in nonvolatile memory, so DS1821 units can be programmed prior to system insertion for true standalone operation.The DS1821 has an operating temperature range of 55°C to +125°C and is accurate to ±1°C over a range of 0°C to +85°C. Communication with the DS1821 is accomplished through the open-drain DQ pin:this pin also serves as the thermostat output.

Features of the DS1821S+ are:(1)requires no external components; (2)functions as a standalone thermostat with user-definable trip-points; (3)provides 8-bit (1°C resolution) centigrade temperature measurements; (4)available in 3-pin PR35 and 8-pin SO packages; (5)applications include thermostatic controls,industrial systems, consumer products, thermometers, or any thermally sensitive system.When configured as standalone thermostat, temperature conversions start immediately at power-up. In this mode, the DQ pin becomes active when the temperature of the DS1821 exceeds the limit programmed into the TH register, and remains active until the temperature drops below the limit programmed into the TL register.

The absolute maximum ratings of the DS1821S+ can be summarized as:(1)voltage on any pin relative to ground:0.5V to +7.0V ;(2)storage temperature:-55 to +125;(3)operating temperature range:-55 to +125;(4)soldering temperature:see-JTD-020A specification.These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied.Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.All communication with the DS1821 begins with an initialization sequence that consists of a reset pulse from the master followed by a presence pulse from the DS1821.This is illustrated in Figure 7.When the DS1821 sends the presence pulse in response to the reset, it is indicating to the master that it is on the bus and ready to operate given an appropriate function command.

Parameters:

Technical/Catalog Information	DS1821S+
Vendor	Maxim Integrated Products
Category	Sensors, Transducers
Voltage - Supply	2.7 V ~ 5.5 V
Package / Case	8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
Packaging	Tube
Output Type	Digital
Sensing Temperature	-55°C ~ 125°C
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	DS1821S+ DS1821S+