STCL132K Datasheet, PDF (6/20 Pages) STMicroelectronics – 32,768 Hz silicon oscillator

Typical application circuit
2
Typical application circuit
STCL132K
Figure 2. Microprocessor (MCU, microcontroller unit) clock – replacement of a 32 KHz crystal
MCU
I/O
Xtal1
(OSC1,
OSCin)
Xtal2
(OSC2,
OSCout)
CE ⁽²⁾
1
VCC
5
NC 2
FOUT
3
STCL132K
GND
4
NC
VCC
0.1 µF ⁽¹⁾
GND
AI12659a
1. 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 V_CC and GND pins of the oscillator device. The whole oscillator
block should then be placed near the microprocessor clock input.
2. Internal 150 kΩ pull-down resistor is implemented on the CE input. If the chip enable feature is not used, in active mode
connect the CE pin to V_CC. 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 ensure clocking occurs during the power-on reset until the microprocessor program starts and
the controlling I/O port takes over the CE control.
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