Part Number: DS1921G-F5

Manufacturer: Maxim Integrated

Description: iButtons & Accessories Thermochron iButton

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of DS1921G-F5#

Datasheet  DS1921G-F5# datasheet
Category Memory Cards, Modules
Family Specialized
Manufacturer Maxim Integrated
Series iButton?
Part Status Active
Memory Type NVSRAM (Non-Volatile SRAM)
Memory Size 512B
Speed *
Technology *
Operating Temperature *

The DS1921G Thermochron iButton is a robust and self-sufficient system that senses temperature and records the data in a memory area protected from unauthorized access. The User-Defined Recording Rate stores temperature values as a histogram. Both of these types of storage are available to the user. The maximum number of temperature readings that may be obtained and saved is 2,048. These readings are taken at equally spaced intervals ranging from 1 to 255 minutes. A resolution of 2.0C is provided for each of the 63 data bins provided by the histogram. The DS1921G will keep track of any temperature excursions from the user-programmed range by recording when they happened, how long they persisted, and whether the temperature was too high or too low.

The DS1921G contains an additional 512 bytes of read-write non-volatile memory, which enables it to store data relating to the item to which it is attached. This memory is non-volatile and does not consume any power. The 1-Wire protocol, which is utilized to transfer data sequentially, calls for the use of just one data lead and a ground return. This brings the total number of wires that need to be connected down to a more manageable level. Every single DS1921G that leaves the factory will have a registration number. This number will be 64 bits long and will be guaranteed to be the only one of its kind. It will also be electrically readable. This ensures that the chain of custody is unbroken and above reproach at every point.

The container made of stainless steel has a long lifespan and is very resistant to environmental hazards that it may be exposed to, such as dust, moisture, and shock. Because it comes with various attachment options, the DS1921G can be set up on almost any surface. This comprises both bags and containers as well as pallets.

DS1921G-F5 Key Features

  • The temperature can be read off a digital thermometer in increments of 0.5 degrees Celsius.
  • The accuracy of the built-in Real-Time Clock (RTC) and Timer ranges from 0 degrees Celsius to 45 degrees Celsius and is 2 minutes each month.
  • Wakes Up and Takes Temperature Readings Automatically at User-Programmable Intervals Ranging from 1 to 255 Minutes.
  • Records up to 2048 consecutive temperature readings in memory that is non-volatile and protected against data loss.
  • The long-term temperature histogram is recorded with a resolution of 2.0 degrees Celsius.
  • Alarm trip points that can be programmed for high and low temperatures, respectively
  • When the temperature leaves the range specified by the trip points, the data logger can record up to 24-time stamps and durations.
  • Five hundred twelve bytes of read-write non-volatile memory can be used for any purpose.
  • Communicates with the Host through the Use of 1-Wire Protocol with a Single Digital Signal Running at 15.4kb or 125kbps.

Frequently Asked Questions

Is an iButton a battery?

The housing is similar to a compact battery, which is why iButtons are frequently referred to as batteries. Some varieties include a miniature battery within, but other than that, it is in no way comparable to a battery. The manufacturer has assigned each iButton® a one-of-a-kind 64-bit number. It is not possible to alter this number.

How Does A Temperature Data Logger Work?

An electronic device capable of saving a number of measurements is referred to as a temperature logger. Inputs from one or more sensors can be accepted by this device, which is typically powered by a battery. The data are sampled and saved at a predetermined frequency. The data logger is recovered after the acquisition period is complete, and the data is then downloaded into a PC for subsequent processing.

What Is Ibutton Reader?

iButton readers and probes are utilized to read information from and input data into iButtons. Some readers, such as the iButton Serial Typer, use straightforward writing software to retrieve the one-of-a-kind iButton ID and then write it down in seconds. It is possible to “mission” or configure iButtons with the assistance of other readers, such as the LinkUSBi Touch and Hold.

What is inside an iButton?

The “can” of an iButton is made of stainless steel and serves as the electrical communications interface. Each can contain a data contact, referred to as the ‘lid,’ and a ground contact called the ‘base,’ connected to the silicon chip. The lid forms the top of the can, while the base creates the sides and bottom of the can.

Is iButton an RFID?

The 1-Wire data protocol is one of the features built into fleet management devices. This protocol may be used to read RFID Tags by simulating them using iButton protocols, one of the implemented features. If you want to integrate driver authorization in your vehicles using RFID Tags but keep the complexity of the setup to a minimum, this is an easy and convenient way to do so.


The DS1921G Thermochron iButton senses temperature and stores the findings in protected memory. At a user-defined rate, both temperature data and a histogram are recorded. Up to 2048 temperature measurements are taken and stored every 1 to 255 minutes. The histogram has 63 bins with 2.0°C resolution. If the temperature escapes a user-programmed range, the DS1921G records when, how long, and if it was too high or too low. 512 bytes of read/write NV memory store object-related data for the DS1921G. The 1-Wire protocol requires only a single data lead and a ground return. Each DS1921G is factory-lasered with a unique, electrically readable 64-bit registration number for absolute traceability.

Durable stainless steel packaging resists dirt, moisture, and shock. Using accessories, the DS1921G can be installed on containers, pallets, and bags.


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