SparkFun
RV-1805-C3 Real Time Clock Module
· MPN: COM-30227
The RV-1805-C3 is an ultra-low-power real-time clock module built for efficient, reliable timekeeping in battery-powered electronics. It integrates the cryst...
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The RV-1805-C3 is an ultra-low-power real-time clock module built for efficient, reliable timekeeping in battery-powered electronics. It integrates the crystal (XTAL) directly into a hermetically sealed ceramic package, removing the need for external clock tuning.
With a maximum timekeeping current of just 0.08µA (80nA), it is well suited to long-life designs where every nanoamp matters. Communication is via a standard I2C, 2-wire serial interface for straightforward integration with microcontrollers.
The module also includes useful internal functions such as a backup battery trickle charger, watchdog timer and 256 bytes of user RAM, making it a compact timing solution for embedded and remote applications.
Features:
- Alarm: Included
- Programmable Clock Output: Included
- RAM: Included
- Timer: Included
- Trickle Charger: Included
- Watchdog Timer: Included
Specifications:
- Type: Clock/Calendar
- Features: Alarm, Programmable Clock Output, RAM, Timer, Trickle Charger, Watchdog Timer
- Memory Size: 256B
- Time Format: HH:MM:SS:hh (12/24 hr)
- Date Format: YY-MM-DD-dd
- Interface: I2C, 2-Wire Serial
- Voltage - Supply: 1.5V ~ 3.6V
- Current - Timekeeping (Max): 0.08µA @ 3V
- Operating Temperature: -40°C ~ 85°C (TA)
- Mounting Type: Surface Mount
- Mfg #: RV-1805-C3-32.768KHZ-2PPM-TA-QC
Jargon buster
Plain-language definitions for the technical terms used above.
- 2-wire serial interface
- A 2-wire serial interface sends data over just a couple of signal wires, typically a clock line and a data line. It lets a device be controlled with only a few microcontroller pins, leaving the rest free for other parts; common examples include I2C and similar clock-plus-data protocols.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- RAM
- RAM (random-access memory) is fast, temporary memory a device uses for working data while it is running; in its common volatile form, its contents are lost when power is removed. Some devices offer a mode that applies settings to RAM only, which is handy for testing changes temporarily because they are not stored permanently and disappear at power-off.
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RV-1805-C3 Real Time Clock Module Datasheet
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Supplier page — sparkfun.com
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