S6E1C3 Datasheet, PDF (37/107 Pages) Cypress Semiconductor – 32-bit ARM® Cortex®-M0+ FM0+ Microcontroller

S6E1C3 Series
7. Handling Devices
Power Supply Pins
In products with multiple VCC and VSS pins, respective pins at the same potential are interconnected within the device in order to
prevent malfunctions such as latch-up. However, all of these pins should be connected externally to the power supply or ground
lines in order to reduce electromagnetic emission levels, to prevent abnormal operation of strobe signals caused by the rise in the
ground level, and to conform to the total output current rating.
Moreover, connect the current supply source with each Power supply pin and GND pin of this device at low impedance. It is also
advisable that a ceramic capacitor of approximately 0.1 µF be connected as a bypass capacitor between each Power supply pin and
GND pin, between AVRH pin and AVRL pin near this device.
Stabilizing Supply Voltage
A malfunction may occur when the power supply voltage fluctuates rapidly even though the fluctuation is within the recommended
operating conditions of the VCC power supply voltage. As a rule, with voltage stabilization, suppress the voltage fluctuation so that
the fluctuation in VCC ripple (peak-to-peak value) at the commercial frequency (50 Hz/60 Hz) does not exceed 10% of the VCC
value in the recommended operating conditions, and the transient fluctuation rate does not exceed 0.1 V/μs when there is a
momentary fluctuation on switching the power supply.
Crystal Oscillator Circuit
Noise near the X0/X1 and X0A/X1A pins may cause the device to malfunction. Design the printed circuit board so that X0/X1,
X0A/X1A pins, the crystal oscillator, and the bypass capacitor to ground are located as close to the device as possible.
It is strongly recommended that the PC board artwork be designed such that the X0/X1 and X0A/X1A pins are surrounded by
ground plane as this is expected to produce stable operation.
Evaluate oscillation of your using crystal oscillator by your mount board.
Sub Crystal Oscillator
This series sub oscillator circuit is low gain to keep the low current consumption. The crystal oscillator to fill the following conditions
is recommended for sub crystal oscillator to stabilize the oscillation.
Surface mount type
Size: More than 3.2 mm × 1.5 mm
Load capacitance: Approximately 6 pF to 7 pF
Lead type
Load capacitance: Approximately 6 pF to 7 pF
Document Number: 002-00233 Rev.*B
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