PIC16F1946 datasheet(103/448 Pages) MICROCHIP

103 / 448 page

 2010-2011 Microchip Technology Inc.

Preliminary

DS41414C-page 103

PIC16(L)F1946/1947

8.0

LOW DROPOUT (LDO)

VOLTAGE REGULATOR

The PIC16F1946/47 has an internal Low Dropout

Regulator (LDO) which provides operation above 3.6V.

The LDO regulates a voltage for the internal device

logic while permitting the VDD and I/O pins to operate

at a higher voltage. There is no user enable/disable

control available for the LDO, it is always active. The

PIC16LF1946/47 operates at a maximum VDD of 3.6V

and does not incorporate an LDO.

A device I/O pin may be configured as the LDO voltage

output, identified as the VCAP pin. Although not

required, an external low-ESR capacitor may be con-

nected to the VCAP pin for additional regulator stability.

The VCAPEN bit of Configuration Word 2 determines

which pin is assigned as the VCAP pin. Refer to Table 8-1.

On power-up, the external capacitor will load the LDO

voltage regulator. To prevent erroneous operation, the

device is held in Reset while a constant current source

charges the external capacitor. After the cap is fully

charged, the device is released from Reset. For more

information on recommended capacitor values and the

constant current rate, refer to the LDO Regulator

Characteristics Table in Section 30.0 “Electrical

Specifications”

TABLE 8-2:

SUMMARY OF CONFIGURATION WORD WITH LDO

TABLE 8-1:

VCAPEN<1:0> SELECT BITS

VCAPEN<1:0>

RF0

No Vcap

Name

Bits

Bit -/7

Bit -/6

Bit 13/5

Bit 12/4

Bit 11/3

Bit 10/2

Bit 9/1

Bit 8/0

on Page

CONFIG2

13:8

—

LVP

DEBUG

—

BORV

STVREN

PLLEN

7:0

—

VCAPEN

—

WRT1

WRT0

Legend:

— = unimplemented locations read as ‘0’. Shaded cells are not used by LDO.

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