48GA004 datasheet(260/268 Pages) MICROCHIP

260 / 268 page

PIC24FJ64GA004 FAMILY

DS39881D-page 260

 2010 Microchip Technology Inc.

APPENDIX B:

ADDITIONAL

GUIDANCE FOR

PIC24FJ64GA004

FAMILY

APPLICATIONS

B.1

Additional Methods for Power

Reduction

Devices in the PIC24FJ64GA004 family include a num-

ber of core features to significantly reduce the applica-

tion’s power requirements. For truly power-sensitive

applications, it is possible to further reduce the

application’s power demands by taking advantage of

the device’s regulator architecture. These methods

help decrease power in two ways: by disabling the

internal voltage regulator to eliminate its power con-

sumption, and by reducing the voltage on VDDCORE to

lower the device’s dynamic current requirements.

Using these methods, it is possible to reduce Sleep

currents (IPD) from 3.5

A to 250 nA (typical values,

refer to specifications DC60d and DC60g in

Table 27-6). For dynamic power consumption, the

reduction in VDDCORE from 2.5V, provided by the

regulator, to 2.0V can provide a power reduction of

about 30%.

When using a regulated power source or a battery with

a constant output voltage, it is possible to decrease

power consumption by disabling the regulator. In this

case (Figure B-1), a simple diode can be used to

reduce the voltage from 3V or greater to the 2V-2.5V

required for VDDCORE. This method is only advised on

power supplies, such as Lithium Coin cells, which

maintain a constant voltage over the life of the battery.

FIGURE B-1:

POWER REDUCTION

EXAMPLE FOR CONSTANT

VOLTAGE SUPPLIES

A similar method can be used for non-regulated

sources (Figure B-2). In this case, it can be beneficial

to use a low quiescent current external voltage regula-

tor. Devices such as the MCP1700 consume only 1

A

to regulate to 2V or 2.5V, which is lower than the

current required to power the internal voltage regulator.

FIGURE B-2:

POWER REDUCTION

EXAMPLE FOR

NON-REGULATED SUPPLIES

VDD

DISVREG

VDDCORE

VSS

PIC24FJ64GA

3.0V

Coin Cell

2.3V

VDD

DISVREG

VDDCORE

VSS

PIC24FJ64GA

3.3V

‘AA’

MCP1700

2.0V

48GA004 Datasheet(PDF) 260 Page - Microchip Technology

48GA004 Datasheet(HTML) 260 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL