Extremely small RTC modules include 32 kHz crystal
23 April 2003
Electronics Technology
Security Services & Risk Management
With the needs of today's smaller mobile equipment in mind, Epson has developed an ultra-compact and thin RTC module. The RX-8564CF is claimed to be one of the world's smallest realtime clock modules including the 32 kHz crystal.
In most cases, realtime clocks (RTC) are usually simple ICs which require an external 32 kHz crystal to be connected as a clock. Epson's advanced method is to integrate both the clock IC and the 32 kHz crystal in one housing. This reduces required PCB space and power consumption, making Epson RTC modules highly suited for mobile equipment, which require a clock function, such as mobile phones, digital still cameras, digital video cameras, PDAs, etc.
This new module encloses a tuning-fork-type crystal used for the ultra-compact Epson FC-135 crystal unit and the same clock IC as used in the Epson RTC-8564JE and RTC-8564NB and it is software-compatible to these RTC modules - it communicates via I2C bus. Besides alarm and timer function, it features a 32,768 kHz output function. With an output-enable option, this signal can be used to drive additional ICs if necessary. The module is operable over a wide 1,8 to 5,5 V range, with only 275 nA (typ.) power consumption at 3 V. It comes in a 5,0 x 3,2 x 1,1 mm ceramic SMD package.
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