# i.MX6 Carriers RTC Overview

### General Information

![](https://developer.solid-run.com/wp-content/uploads/2018/10/rtc-schematics.png)

A real-time clock (RTC) is a computer clock that keeps track of the current time. The RTC circuitry is integrated into the [HummingBoard Professional](/nxp/imx6/sbc-platform/hummingboard-imx6-sbc-quick-start-guide/hummingboard-pro-quick-start-guide.md) and the [Cubox-i](/nxp/imx6/sbc-platform/cubox-i-quick-start-guide.md) uses a CR1620 sized Lithium/Manganese Dioxide (LiMnO²) Coin Cell.

This coin cell should be the only part to connect to the header provided on the device to power this circuit.

### General Requirement

Operation Temperature Range: -20°C to +70°C

Storage Temperature Range: 0°C to +30°C

Storage Humidity: 40 \~ 75%

Weight: 1,3g

Materials of Positive Terminal: SUS430+NI-palted

Materials of Negative Terminal: SUS430+NI-palted.

### Electrical Requirement

![](https://developer.solid-run.com/wp-content/uploads/2018/10/hb-rtc-detail.jpg)

\[RTC Circuit Schematic]

Nominal Voltage: 3V

Nominal Capacity: 70mAh (under Load 30kO Load and 2.0V End-voltage)

Load Resistance: 30kO

Standard Discharge Current: 0.2 mA


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