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PSoC® 4: PSoC 4100M Family

Datasheet

Document Number: 001-96519 Rev. *E

Page 13 of 41

Power

The supply voltage range is 1.71 to 5.5 V with all functions and

circuits operating over that range.

The PSoC 4100M family allows two distinct modes of power

supply operation: Unregulated External Supply and Regulated

External Supply modes.

Unregulated External Supply

In this mode, the PSoC 4100M is powered by an External Power

Supply that can be anywhere in the range of 1.8 to 5.5 V. This

range is also designed for battery-powered operation, for

instance, the chip can be powered from a battery system that

starts at 3.5V and works down to 1.8 V. In this mode, the internal

regulator of the PSoC 4100M supplies the internal logic and the

VCCD output of the PSoC 4100M must be bypassed to ground

via an external Capacitor (in the range of 1 to 1.6 µF; X5R

ceramic or better).

The grounds, VSSA and VSS, must be shorted together. Bypass

capacitors must be used from VDDD and VDDA to ground,

typical practice for systems in this frequency range is to use a

capacitor in the 1 µF range in parallel with a smaller capacitor

(0.1 µF, for example). Note that these are simply rules of thumb

and that, for critical applications, the PCB layout, lead

inductance, and the Bypass capacitor parasitic should be

simulated to design and obtain optimal bypassing.

Regulated External Supply

In this mode, the PSoC 4100M is powered by an external power

supply that must be within the range of 1.71 to 1.89 V (1.8 ±5%);

note that this range needs to include power supply ripple. VCCD

and VDDD pins are shorted together and bypassed. The internal

regulator is disabled in firmware.

Power Supply

Bypass Capacitors

VDDD–VSS and

VDDIO-VSS

0.1 µF ceramic at each pin plus bulk

capacitor 1 to 10 µF.

VDDA–VSSA

0.1 µF ceramic at pin. Additional 1 µF to

10 µF bulk capacitor

VCCD–VSS

1 µF ceramic capacitor at the VCCD pin

VREF–VSSA

(optional)

The internal bandgap may be bypassed

with a 1 µF to 10 µF capacitor for better

ADC performance.

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