STCL1120 datasheet(7/18 Pages) STMICROELECTRONICS

7 / 18 page

STCL1100 STCL1120 STCL1160

Typical application circuit

Doc ID 13337 Rev 5

7/18

Typical application circuit

Figure 2.

Microprocessor (MCU, microcontroller unit) clock example

- replacement of a crystal or ceramic resonator

For reliable operation and to further improve immunity to harsh environment, the minimum 0.1 µF decoupling capacitor is

recommended to be placed as close as possible to the VCC and GND pins of the oscillator device. The whole oscillator

block should then be placed near the microprocessor clock input.

To minimize standby current, no internal pull-up resistor to VCC is implemented on the CE input, thus the input level must

be permanently defined by the controlling signal. If the chip enable feature is not used, in active mode connect the CE pin

to VCC. In applications utilizing standby mode and where the CE pin is connected to the controlling I/O port of the clocked

microprocessor, for successful startup of the microprocessor at power-on, initial logic high level needs to be secured on the

CE pin to provide clock already during the power-on reset until the microprocessor program starts and the controlling I/O

port takes over the CE control.

AI12657d

STCL1xx0

CE (2)

VCC

FOUT

GND

MCU

I/O

Xtal1

(OSC1,

OSCin)

Xtal2

(OSC2,

OSCout)

VCC

5 V

GND

0.1 µF(1)

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