Anterwell Technology Ltd.

          Anterwell Technology Ltd.


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Computer Circuit Board Chips Programmed Integrated Digital DS1821S

Good quality Programmable IC Chips for sales
Good quality Programmable IC Chips for sales
We have cooperate with Anterwell near 7 years. always very good quality good service. Original and very fast delivery. A very good partner.

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Sharon is a very good girl, we are very happy to cooperate with her. Competitive price and professional. Never have quality problem with them.

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We always buy XILINX parts from Anterwell. High quality with good price. Hope can have more business with you.

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Computer Circuit Board Chips Programmed Integrated Digital DS1821S

China Computer Circuit Board Chips Programmed Integrated Digital DS1821S supplier

Large Image :  Computer Circuit Board Chips Programmed Integrated Digital DS1821S

Product Details:

Place of Origin: Philippine
Certification: Original Factory Pack
Model Number: DS1821S

Payment & Shipping Terms:

Minimum Order Quantity: 100pcs
Price: Negotiation
Packaging Details: please contact me for details
Delivery Time: 1 Day
Payment Terms: T/T, Western Union,PayPal
Supply Ability: 15000PCS
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Detailed Product Description
Voltage: –0.5V To +7.0V Shipment:: DHL, Fedex, TNT, EMS Etc
Package: Sop-8 Main Line:: Ic,module,transistor,diodes,capacitor,resistor Etc
Pack: Reel Temperature: –55°C To +125°C
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Computer Circuit Board Chips Programmed Integrated Digital DS1821S


DS1821S Programmable Digital Thermostat and Thermometer


Computer Circuit Board Chips Programmed Integrated Digital DS1821S



Requires no external components ƒ

Unique 1-Wire® interface requires only one port pin for communication ƒ


Operates over a -55°C to +125°C (-67°F to +257°F) temperature range


ƒ Functions as a standalone thermostat with user-definable trip-points ƒ Provides 8-bit (1°C resolution) centigrade temperature measurements


ƒ Accuracy is ±1°C over 0°C to +85°C range ƒ Converts temperature to a digital word in 1 second (max)


Available in 3-pin PR35 and 8-pin SO packages ƒ


Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system





                                                                                                                                                                    PIN DESCRIPTION

                                                                                      GND - Ground

                                                                                       DQ - Data In/Out and Thermostat Output

                                                                                       VDD - Power Supply

                                                                                       Voltage NC - No Connect



The core functionality of the DS1821 is its proprietary direct-to-digital temperature sensor, which provides 8-bit (1°C increment) centigrade temperature readings over the range of -55°C to +125°C. A block diagram of the temperature measurement circuitry is shown in Figure 2. This circuit measures the temperature by counting the number of clock cycles generated by an oscillator with a low temperature coefficient (temp-co) during a gate period determined by a high temp-co oscillator. The low temp-co counter is preset with a base count that corresponds to –55°C. If the counter reaches 0 before the gate period is over, the temperature register, which is preset to –55°C, is incremented by one degree, and the counter is again preset with a starting value determined by the slope accumulator circuitry. The preset counter value is unique for every temperature increment and compensates for the parabolic behavior of the oscillators over temperature. At this time, the counter is clocked again until it reaches 0. If the gate period is not over when the counter reaches 0, the temperature register is incremented again. This process of presetting the counter, counting down to zero, and incrementing the temperature register is repeated until the counter takes less time to reach zero than the duration of the gate period of the high temp-co oscillator. When this iterative process is complete, the value in the temperature register will indicate the centigrade temperature of the device.




Digital Output


Digital Output


+125°C 0111 1101 7Dh
+85°C 0101 0101 55h
+25°C 0001 1001 19Hh
0°C 0000 0000 00h
-1°C 1111 1111 FFh
-25°C 1110  0111 E7h
-55°C 1100 1001 C9h


HIGH-RESOLUTION TEMPERATURE READINGS The user can calculate temperature values with higher than 8-bit resolution using the data remaining in the counter and slope accumulator when the temperature conversion is complete. To do this the user must first read the temperature from the 8-bit temperature register. This value is called TEMP_READ in the high-resolution equation (see Eq. 1). The 9-bit counter value must then be obtained by issuing the Read Counter [A0h] command. This value is the count remaining in the counter at the end of the gate period and is called COUNT_REMAIN in Eq. 1. Next the Load Counter [41h] command must be issued, which loads the 9-bit slope accumulator value into the counter register. The slope accumulator value (called COUNT_PER_C in Eq. 1) can then be read from the counter by again issuing the Read Counter [A0h] command. The slope accumulator value is called “COUNT_PER_C” because it represents the number of counts needed for an accurate measurement at a given temperature (i.e., the counts per degree C). The high-resolution temperature can then be calculated using Eq. 1: Eq. 1) TEMPERATURE = TEMP_READ − 0.5 + COUNT PER C COUNT PER C COUNT REMAIN _ _ ( _ _ − _ ) High-resolution temperature readings cannot be used while in continuous conversion mode. Also, the Read Counter [A0h] and Load Counter [41h] commands must not be used while in continuous conversion mode.




Computer Circuit Board Chips Programmed Integrated Digital DS1821S

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Anterwell Technology Ltd.

Contact Person: Miss. Sharon Yang

Tel: 86-755-61169882

Fax: 86-755-613169859

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