I²C device

DS3231 RTC

The DS3231 RTC is an I²C device in the LabWired part catalog. Its catalog type is ds3231. It connects to the MCU over I²C at the default address 0x68. The catalog gives a supply range of 2.3–5.5 V. It has 5 pins. A registered peripheral model runs in the engine: the firmware talks to it over the real bus and gets device-accurate responses.

Key facts

Category	I²C devices
Catalog type	`ds3231`
Interface	I²C
Default I²C address	`0x68` (104 decimal)
Supply range	2.3–5.5 V
Pins	5
Datasheet	Maxim Integrated DS3231 extremely accurate I2C-integrated RTC/TCXO/crystal datasheet

What LabWired simulates

What is simulated

Simulated device model

How it was validated

Built from the datasheet. Implemented from the part’s register documentation and exercised by automated tests. Nothing physical was ever placed next to it.

DS3231 RTC pinout

Power: VCC, GND
I²C: SDA, SCL
Other signals: SQW

Pin	Electrical type	Function
`VCC`	Power input	Supply
`GND`	Power input	Supply
`SDA`	Open-drain	I²C data (SDA)
`SCL`	Open-drain	I²C clock (SCL)
`SQW`	Output	—

How to simulate the DS3231 RTC in LabWired

Open the Playground at app.labwired.com and place an MCU board.
Add the DS3231 RTC (catalog type ds3231).
Connect VCC and GND to the supply and ground of the board. Use a supply inside the catalog range of 2.3–5.5 V.
Connect SDA and SCL to the I²C data and clock pins of the board.
Connect SQW as your circuit needs.
Run the firmware. It finds the part on the I²C bus at 0x68 and reads and writes it as on hardware.

Other parts at I²C address 0x68

These catalog parts use the same default address. Two parts at one address cannot share one bus segment. A bus switch such as the TCA9548A puts them on separate segments.

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