DSPIC33FJ32GS608 datasheet(336/416 Pages) MICROCHIP

336 / 416 page

dsPIC33FJ32GS406/606/608/610 and dsPIC33FJ64GS406/606/608/610

DS70591B-page 336

Preliminary

 2009 Microchip Technology Inc.

24.2

On-Chip Voltage Regulator

The

dsPIC33FJ32GS406/606/608/610

and

dsPIC33FJ64GS406/606/608/610 devices power their

core digital logic at a nominal 2.5V. This can create a con-

flict for designs that are required to operate at a higher

typical voltage, such as 3.3V. To simplify system design,

all devices in the dsPIC33FJ32GS406/606/608/610 and

dsPIC33FJ64GS406/606/608/610 families incorporate

an on-chip regulator that allows the device to run its core

logic from VDD.

The regulator provides power to the core from the other

VDD pins. When the regulator is enabled, a low-ESR

(less than 5 ohms) capacitor (such as tantalum or

ceramic) must be connected to the VCAP/VDDCORE pin

(Figure 24-1). This helps to maintain the stability of the

regulator. The recommended value for the filter

capacitor is provided in Table 27-13 located in

Section 27.1 “DC Characteristics”.

On a POR

, it takes approximately 20 s for the on-chip

voltage regulator to generate an output voltage. During

this time, designated as TSTARTUP, code execution is

disabled. TSTARTUP is applied every time the device

resumes operation after any power-down.

FIGURE 24-1:

CONNECTIONS FOR THE

ON-CHIP VOLTAGE

REGULATOR(1,2)

CMPPOL1

FCMP

Comparator Hysteresis Polarity (for odd numbered comparators)

1 = Hysteresis is applied to falling edge

0 = Hysteresis is applied to rising edge

HYST1<1:0>

FCMP

Comparator Hysteresis Select

11 = 45 mV Hysteresis

10 = 30 mV Hysteresis

01 = 15 mV Hysteresis

00 = No Hysteresis

TABLE 24-2:

dsPIC33F CONFIGURATION BITS DESCRIPTION (CONTINUED)

Bit Field

Description

Note:

It is important for the low-ESR capacitor to

be placed as close as possible to the

VCAP/VDDCORE pin.

Note 1:

These are typical operating voltages. Refer

to Table 27-13 located in Section 27.1 “DC

Characteristics” for the full operating

ranges of VDD and VCAP/VDDCORE.

It is important for the low-ESR capacitor to

be placed as close as possible to the VCAP/

VDDCORE pin.

VDD

VCAP/VDDCORE

VSS

dsPIC33F

CEFC

3.3V

dsPIC33FJ32GS608 Datasheet(PDF) 336 Page - Microchip Technology

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