Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller UQFN 40 (5x5) 8-Bit 20 MHz I/O number 36

 2010-2013 Microchip Technology Inc. DS40001452D-page 83

PIC16(L)F1516/7/8/9

8.2 Low-Power Sleep Mode

The PIC16F1516/7/8/9 device contains an internal Low

Dropout (LDO) voltage regulator, which allows the

device I/O pins to operate at voltages up to 5.5V while

the internal device logic operates at a lower voltage.

The LDO and its associated reference circuitry must

remain active when the device is in Sleep mode. The

PIC16F1516/7/8/9 allows the user to optimize the oper-

ating current in Sleep, depending on the application

requirements.

A Low-Power Sleep mode can be selected by setting

the VREGPM bit of the VREGCON register. With this

bit set, the LDO and reference circuitry are placed in a

low-power state when the device is in Sleep.

8.2.1 SLEEP CURRENT VS. WAKE-UP

TIME

In the default operating mode, the LDO and reference

circuitry remain in the normal configuration while in

Sleep. The device is able to exit Sleep mode quickly

since all circuits remain active. In Low-Power Sleep

mode, when waking up from Sleep, an extra delay time

is required for these circuits to return to the normal con-

figuration and stabilize.

The Low-Power Sleep mode is beneficial for applica-

tions that stay in Sleep mode for long periods of time.

The normal mode is beneficial for applications that

need to wake from Sleep quickly and frequently.

8.2.2 PERIPHERAL USAGE IN SLEEP

Some peripherals that can operate in Sleep mode will

not operate properly with the Low-Power Sleep mode

selected. The LDO will remain in the normal power

mode when those peripherals are enabled. The Low-

Power Sleep mode is intended for use with these

peripherals:

• Brown-Out Reset (BOR)

• Watchdog Timer (WDT)

• External interrupt pin/Interrupt-on-change pins

• Timer1 (with external clock source)

• CCP (Capture mode)

Note: The PIC16LF1516/7/8/9 does not have a

configurable Low-Power Sleep mode.

PIC16LF1516/7/8/9 is an unregulated

device and is always in the lowest power

state when in Sleep, with no wake-up time

penalty. This device has a lower maximum

DD and I/O voltage than the

PIC16F1516/7/8/9. See Section 25.0

“Electrical Specifications” for more

information.