CR2032 - Battery for Real-Time Clock

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Intended Purpose

A standard lithium battery (type CR2032) is used to backup the real-time clock (RTC) in the adaptors TA561-RTC TA561-RTC - Real-time Clock Adaptor and TA562-RS-RTC TA562-RS-RTC - Adapter with Serial RS-485 (COM2) and Real-time Clock during power failures.

The CPU monitors the discharge degree of the battery. An diagnoses message is output before the battery condition becomes critical (about 2 weeks before). After the diagnosis message has appeared, the battery should be replaced as soon as possible.

Handling Instruction

  • The handling instructions of the battery manufacturer must be observed.
  • The Material Safety Data Sheet (MSDS) of the battery manufacturer must be observed.
  • Do not short-circuit or re-charge the battery! It can cause excessive heating and explosion.
  • Do not disassemble the battery!
  • Do not heat up the battery and not put into fire! Risk of explosion.
  • Store the battery in a dry place.
  • Recycle exhausted batteries meeting the environmental standards.
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Transport

Transport \ of lithium batteries or equipment with installed lithium batteries:

  • The transport and handling instructions of the battery producer must be observed.
  • The transport regulations for transport of lithium batteries must be observed e.g. for transport by road or air.
  • The forwarder must be informed if batteries are contained in the shipment.

Electrical \ Connection

Assembling and electrical connection of the battery is described in chapters TA561-RTC Real-time Clock Adaptor TA561-RTC - Real-time Clock Adaptor and TA562-RS-RTC Serial RS-485 and Real-time Clock Adaptor TA562-RS-RTC - Adapter with Serial RS-485 (COM2) and Real-time Clock.

Battery Lifetime

The battery lifetime is the time the battery can operate the RTC while the CPU is not powered. The typical lifetime is 300 days (at 25 °C).

As long as the CPU is powered, the battery will only be discharged by its own leakage current.

Technical Data

The battery must meet die following technical data:

Battery designation CR2032
Description Manganese dioxide button cell, primary cell, not rechargeable
Nominal voltage 3 V DC
Capacity 230 mAh (measured with 5.6 kW load at 20 °C, discharging down to 2.0 V)
Typical lifetime (at 25 °C, CPU not powered) 300 days
Temperature range ³ 0 … +70 °C
Diameter 20 mm
Height 3.2 mm