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KYOCERA Develops 32kHz AT-cut Crystal Oscillator with World's First Low Current Consumption of 80μA

Responding to the needs of electric vehicle and smart meter applications

September 27, 2012
Kyocera Corporation (President: Tetsuo Kuba) today announced that its wholly owned subsidiary in charge of developing and manufacturing crystal devices, Kyocera Crystal Device Corporation, has succeeded in developing an AT-cut crystal oscillator (KC2520M) with an output frequency of 32kHz, which has the world's first*1 low current consumption of 80μA. A crystal device for use in electric vehicles and smart meters, the mounting area has also been reduced by approximately 40% compared to conventional products (3225-size) available in the market.

The KC2520M (32kHz) will be available on a sample basis in September 2012, and will be on display at the company's booth at the CEATEC JAPAN 2012 exhibition to be held from October 2 to October 6, 2012 at Makuhari Messe in Chiba Prefecture, Japan.

Photo:Kyocera AT-cut crystal oscillator KC2520M (32kHz)
Kyocera AT-cut crystal oscillator KC2520M (32kHz)


Product name AT-cut crystal oscillator
KC2520M (32kHz)
Applications Electric vehicles, smart meters and other general electronic devices
Dimensions 2.5mm x 2.0mm
Height : 0.7mm
Availability Starting in September 2012 (sample basis)
Output frequency 32kHz
Current consumption

80μA


Development Background

The 32kHz crystal device is an electronic component that is installed for use as a clock function in various general electronic devices. In recent years, its range of use has expanded to automobiles and smart meters among other applications. Since high reliability is required, especially for in-vehicle use, the AT-cut crystal oscillator with its high accuracy and high strength can be used stably in a wide temperature range.

The typical current consumption of conventional products is several mA (1mA=1,000μA). However, for crystal oscillators used in electric and hybrid-electric vehicles -- for which demand has recently been rapidly growing -- the need to further reduce the current consumption in order to save battery life is rapidly increasing, in addition to the needs for downsizing, higher strength and higher accuracy.

On the basis of these needs, Kyocera Crystal Device has worked on developing a 32kHz AT-cut crystal oscillator and has commercialized its new crystal oscillator KC2520M (32kHz), which achieves a low current consumption of 80μA for the first time in the world, at the smaller size of 2.5 x 2.0mm.

By introducing this crystal oscillator into the market, Kyocera will contribute to the further development of automotive applications and other products used in the environment and energy related fields.

Main Features

1. Achieving the world's first low current consumption AT-cut crystal oscillator with an output frequency of 32kHz
In collaboration with an IC manufacturer, we have achieved a low current consumption of 80μA for the first time in the world for an AT-cut crystal oscillator with 32kHz despite its small size. This feature is expected to expand the use of the product for electric and hybrid-electric vehicles for which conservation of battery life is essential.

2. Using AT-cut oscillators with superior temperature characteristics
Since the KC2520M (32kHz) uses an AT-cut crystal element that is utilized as a standard frequency source for mobile phones and CPUs, it has better temperature characteristics than tuning-fork type crystal elements and can achieve high frequency accuracy. As a result, it can ensure high accuracy also when used for automobiles and smart meters, for which an accurate clock function incorporated into electronic devices is required in a wide temperature range. In addition, due to its structure which integrates a crystal with an IC, it has higher impact resistance than the tuning-fork type.

3. Achieving size reduction
By making full use of the company's small crystal blank processing technology and IC assembly technology which have been cultivated through development of products for mobile phones and PCs, Kyocera Crystal Device has succeeded in commercializing a 2520-size product with a 40% reduced mounting area compared to the 3225-size product which has conventionally been used for AT-cut crystal oscillators with 32kHz.

Specifications

External dimensions 2.5 x 2.0 x 0.7mm typ.
Output frequency 32.768kHz
Operating temperature range -40 to 125 degrees Celsius
Frequency-temperature characteristics ±80 x 10-6
Frequency deviation vs. load

±4 x 10-6
Frequency deviation vs. supply voltage ±0.5 x 10-6 (Vcc±10%)
Supply voltage 1.6 to 5.5V
Output voltage MIN 90%Vcc
Current consumption Typ. 80μA

*1 Based on research by Kyocera Crystal Device Corp.; as of August 28, 2012.,