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Name: DS1821S
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1821S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Any Feature, including a modified Existing Feature, that is not an Existing Feature.

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Analog Devices Inc./Maxim Integrated DS1821S

Part No.:: DS1821S

Manufacturer:: Analog Devices Inc./Maxim Integrated

Package:: 8-SOIC (0.209, 5.30mm Width)

Datasheet:: DS1821S.pdf

Description:: SENSOR DIGITAL -55C-125C 8SO

In Stock:: 2994

Quantity:: Add To Cart

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DS1821S Specifications

Packaging:
Tube
Series:
-
ProductStatus:
Obsolete
SensorType:
Digital, Local
SensingTemperature-Local:
-55°C ~ 125°C
SensingTemperature-Remote:
-
OutputType:
1-Wire®
Voltage-Supply:
2.7V ~ 5.5V
Resolution:
8 b
Features:
One-Shot, Output Switch, Programmable Limit, Standby Mode
Accuracy-Highest(Lowest):
±1°C
TestCondition:
0°C ~ 85°C
OperatingTemperature:
-55°C ~ 125°C
MountingType:
Surface Mount

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DS1821S information

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DS1821S Typical application Circuitry

DS1821S

The DS1821S is a Programmable Digital Thermometer and Thermostat chip developed by Maxim Integrated. This versatile device combines the functionality of precise temperature measurement with the capability of setting programmable temperature thresholds, which can trigger thermostat actions. It's designed for a wide range of applications requiring temperature monitoring and control, such as environmental controls, system thermal management, and consumer appliances.

Key Features and Parameters:

- Temperature Range: The DS1821S can measure temperatures from -55°C to +125°C, providing flexibility for diverse applications.

- Programmable Resolution: It offers adjustable resolution from 9 to 12 bits, allowing users to optimize between measurement precision and conversion speed.

- Programmable Thermostat Function: Includes the ability to set high and low temperature thresholds, enabling it to act as a standalone thermostat.

- 1-Wire Interface: Simplifies communication and power with a single wire, reducing the complexity and cost of wiring in embedded applications.

- Non-Volatile Memory: Settings such as temperature limits are stored in non-volatile memory, preserving configurations across power cycles.

Application Scenario – Smart Home Heating System:

In a smart home heating system, the DS1821S can be utilized to monitor room temperatures and control heating elements dynamically, ensuring efficient energy usage while maintaining comfort.

Circuit Design Details:

1. Power and Communication:

- DQ (Pin 1): This pin serves as the communication line for the 1-Wire interface and can also deliver power to the device in a parasitic power configuration. Connect DQ to a digital I/O pin on a microcontroller. A 4.7kΩ pull-up resistor is essential, connecting DQ to the +5V power line to ensure proper logic levels and power supply.

2. Ground Connection:

- GND (Pin 2): Connect this pin directly to the system's ground. This ensures a common ground reference for accurate temperature measurement and device stability.

3. Optional External Power Supply:

- VDD (Pin 3): While the DS1821S can operate in a parasitic power mode through the DQ pin, connecting VDD to a +5V supply can enhance device performance, especially in environments with high electrical noise. Use a 0.1µF decoupling capacitor close to VDD to filter out voltage spikes.

Design Considerations:

- 1-Wire Bus Configuration: When integrating the DS1821S into a system with multiple 1-Wire devices, careful attention to bus topology and cable lengths is required to maintain reliable communication.

- Environmental Conditions: The placement of the DS1821S should be strategic to avoid proximity to heat sources that could affect its temperature readings. Consider using a small, thermally conductive enclosure to shield it from external thermal interference.

- Electrical Noise: In applications with significant electrical noise, additional filtering on the DQ line may be necessary to ensure reliable 1-Wire communication.

- Software Integration: Developing software that accurately reads temperature data, configures thermostat settings, and responds to temperature threshold events is crucial for maximizing the DS1821S's capabilities in a smart heating system.

- Power Supply Considerations: In systems where the DS1821S is powered parasitically, ensure the microcontroller's I/O pin can provide sufficient current for stable operation. In configurations using external power (VDD), verify that the power supply can maintain a stable +5V, even under varying load conditions.

Employing the DS1821S in a smart home heating system not only enhances the system's responsiveness to temperature changes but also promotes energy efficiency by providing precise control over heating elements based on actual room temperatures. This application highlights the DS1821S's utility in creating more intelligent and responsive environmental control systems, underscoring its value in modern smart home technologies.

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6. What is the process for return or replacement of DS1821S?

All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the DS1821S we delivered, we will accept the replacement or return of the DS1821S only when all of the below conditions are fulfilled:

(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of DS1821S.

(3)The PartNo is unused and only in the original unpacked packaging.

Two processes to return the products:

(1)Inform us within 90 days

(2)Obtain Requesting Return Authorizations