A-Crystal Low-power 32.768KHz Oscillator

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Breaking News A-Crystal low-power 32.768KHz oscillator

Oct 30, 2020

In order to alleviate the recent tight supply and price increase of the chip crystal oscillator[MC306/MC146/3215/2012 32.768KHz]series products.

A-crystal has launched an activelow-power SMD 32.768KHz crystal oscillator product. Its performance is better than tuning fork resonators in all aspects.

Low-power 32.768KHz oscillator parameters:
1. Temperature range:-40℃-+85℃;
2. Package size:7.0*5.0mm, 5.0*3.2mm, 3.2*2.5mm, 2.5*2.0mm;
3. Voltage: 1.2V-3.6V;
4. Currentconsumption value: 7μA Max.;
5. Initial frequency deviation:±5ppm, ±10ppm, ±20ppm;
6. Temperature frequency deviation: ±20ppm;

Comparison of electrical parameters/32.768KHz key electrical parameter comparison:

	A. Resonator 32.768KHz	B. Oscillator 32.768KHz	Comparison of advantages and disadvantages
Package	7O15mm 3215mm 2012mm	7O50mm 5032mm 3225mm 2520mm	The size is similar, A is slightly smaller
Initial frequency deviation	Main±20ppm	±5ppm ±10ppm ±20ppm optional	The initial accuracy of B is better than A
Temperature frequency deviation (-40℃~85℃)	±150ppnm	±20ppnm	The temperature characteristic of B is better than A
Power consumption (current consumption)	Power consumption is related to circuit matching	7uA MAX(Supply voltage 3v)	The power consumption is close
Operating Voltage	Passive components, determined by Ic and circuit	1.2V~3.6v	B is a wide-voltage power supply, suitable for button batteries.
Application FAQ	1，It is not easy to vibrate in a humid environment. 2. Improper capacitor matching, it is easy to occur, it is not easy to start vibration, touch it, heat it, touch the multimeter to vibrate and other unstable vibration. 3.There are requirements for matching capacitors. Mismatched capacitors can easily cause frequency drift.	The voltage is stable, the frequency output is stable	B is better than A, and B works in an environment where A cannot work.

Circuit substitutionprogram

Active crystal oscillator circuit diagram

Passive crystal oscillator circuit diagram

Precautions:

1. Under normal circumstances, the frequency output of the active crystal oscillator can be directly connected to the input pin XIN of the IC, and XOUT can be left floating. Cp is the coupling capacitor, the purpose is to block DC, usually can be omitted. Or refer to IC datasheet.

2. Some ICs use active crystal oscillators and need to configure the pin registers before they can be used.

3. A few types of ICs connect the active crystal oscillator output directly to the IC XOUT pin. Please refer to the IC information.

Summary

1. As the price of SMD 32.768KHz crystal increases, and the delivery date is unstable. The domestic SMD active 32.768KHz oscillator can ease the tight supply situation.

2. The patch is active at 32.768KHz, and the temperature frequency difference is more advantageous. In a wide temperature range (-40℃～85℃), the temperature frequency difference change can easily be within ±20ppm.

3. The power consumption is not much different, but the active 32.768KHz oscillator eliminates the need for complicated circuit matching, and the performance is more stable.

Zhe Jiang A-Crystal electronic technology Co.,Ltd

A-Crystal factory tour: https://www.youtube.com/watch?v=uMqJq6e_8Ew

Web: https://www.acrystals.com/

Email: eva.wang@acrystals.com
Wechat:13857686588

Address: 17th Building, A District, Feiyue Technology Innovation Park, Jiaojiang, Taizhou, Zhejiang, China. ZIP:318014

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