Started sales of crystal oscillator IC “WF7701” which simultaneously generates
two oscillation signals of different frequencies (32.768 kHz and MHz band)

Seiko NPC Corporation (HQ: Taito-ku, Tokyo; President: Hiroaki Okawa) started selling the oscillator IC “WF7701”, for crystal oscillators, which simultaneously generates two oscillation signals of different frequencies (32.768 kHz and MHz band).

The market of smartphone and tablet continue to expand due to the transition to 5G mobile communication systems (5G). In recent years, the wearable equipments which are their peripheral devices (wristband type, glasses type, clip type, etc.) are also extremely expanded. In typical wearable equipment, a frequency signal 32.768 kHz for clock units and a frequency signal of MHz band are required. And, for that purpose, two sets of crystal blank and oscillator IC are required. Since this new product IC has two oscillation circuits, it is possible to generate the necessary two types of frequency signals simultaneously just by connecting one crystal blank.

Product Features

1. Generates two oscillation signals by using only one IC

Since this new product IC has two oscillation circuits, it is possible to generate both the frequency of 32.768 kHz and the frequency signal of MHz band by using only one IC.

2.Preparation of only one crystal blank

Typical wearable equipment requires two crystal blanks to generate two different frequency signals, an AT-cut type crystal blank for MHz band frequencies and a tuning fork type crystal blank for 32.768 kHz frequency are being prepared. By using the above new product IC, customers only need to prepare AT-cut crystal blanks, which reduce workload and costs for customers’ oscillator production.

3.Reducing current consumption

Although it is possible to simultaneously output a frequency signal of MHz band and a frequency signal of 32.768 kHz for clock units, it is also possible to output only the 32.768kHz frequency signal by the control signal to the mode terminal. When outputting only the 32.768 kHz frequency signal, it operates with ultra-low current consumption.

Specification

  • Operating temperature range: -40℃ to +85℃
  • Applicable supply voltage range: 1.6V to 3.7V
  • Oscillation frequency:  AT-cut type :24MHz to 52MHz
  • Output frequency: MHz pin(12MHz~52MHz)、kHz pin(32.768kHz)
  • Current consumption: 0.76μA typ.@VDD =1.8V, No-load(1frequency signal:Stopped MHz)
    0.6mA typ.@VDD =1.8V, No-load(2 frequency signals)
  • Oscillator capacitance: CG,CD built-in
  • Output level: CMOS
  • Output drive capability: MHz pin: ±0.8mA、kHz pin:±20μA
  • MHz band: Output 3 state function
    (Output clock signal of MHz pin, Standby mode:Hi-Z)
    ※In program mode, SDA pin is the serial interface data input/output.
  • f0 adjustment function by embedded One Time Programmable Memory(OTP)
    : Adjustment range of f0 ±20ppm(min), Resolution 1ppm/bit(max)
    Adjustment range of oscillator load capacitance 2.0pF~2.9pF

 

Applications

  • Near field wireless communications such as Bluetooth/Wifi, Wearable equipment, etc

 

Block Diagram

 

 

Information

Device
7701Series

 


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