Microchip Technology AC160214 Data Sheet

 2010-2012 Microchip Technology Inc.

DS41414D-page 103

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 V

DD

 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 V

DD

 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 V

CAP

 pin. Although not

required, an external low-ESR capacitor may be con-
nected to the V

CAP

 pin for additional regulator stability.

The VCAPEN bit of Configuration Words enables or dis-
ables the V

CAP

 pin. Refer to 

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 the constant current rate, refer to the
LDO Regulator Characteristics Table in 

0

RF0

1

No Vcap

CONFIG2

13:8

—

—

LVP

DEBUG

—

BORV

STVREN

PLLEN

7:0

—

—

—

VCAPEN

—

—

WRT1

WRT0

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