PIC16F1938_13 Datasheet, PDF (99/488 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver

PIC16(L)F1938/9
8.0 LOW DROPOUT (LDO)
VOLTAGE REGULATOR
The PIC16F193X 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
PIC16LF193X 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<1:0> bits of Configuration Words deter-
mines 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 the constant current rate, refer to the
LDO Regulator Characteristics Table in Section 30.0
“Electrical Specifications”.
TABLE 8-1: VCAPEN<1:0> SELECT BITS
VCAPEN<1:0>
Pin
00
RA0
01
RA5
10
RA6
11
No VCAP
TABLE 8-2: SUMMARY OF CONFIGURATION WORD WITH LDO
Name Bits Bit -/7
Bit -/6
Bit 13/5 Bit 12/4 Bit 11/3 Bit 10/2 Bit 9/1
13:8
—
—
LVP
DEBUG
—
BORV
CONFIG2
7:0
—
—
VCAPEN<1:0>⁽¹⁾
—
—
Legend: — = unimplemented locations read as ‘0’. Shaded cells are not used by LDO.
Note 1: PIC16F193X only.
STVREN
WRT1
Bit 8/0
PLLEN
WRT0
Register
on Page
56
 2011-2013 Microchip Technology Inc.
DS40001574C-page 99