Microchip Technology TDGL019 Data Sheet
© 2011-2014 Microchip Technology Inc.
DS60001168F-page 237
PIC32MX1XX/2XX
26.3
On-Chip Voltage Regulator
All PIC32MX1XX/2XX devices’ core and digital logic
are designed to operate at a nominal 1.8V. To simplify
system designs, most devices in the PIC32MX-
1XX/2XX family incorporate an on-chip regulator pro-
viding the required core logic voltage from V
are designed to operate at a nominal 1.8V. To simplify
system designs, most devices in the PIC32MX-
1XX/2XX family incorporate an on-chip regulator pro-
viding the required core logic voltage from V
DD
.
A low-ESR capacitor (such as tantalum) must be
connected to the V
connected to the V
CAP
). This
helps to maintain the stability of the regulator. The
recommended value for the filter capacitor is provided
in
recommended value for the filter capacitor is provided
in
.
26.3.1
ON-CHIP REGULATOR AND POR
It takes a fixed delay for the on-chip regulator to gener-
ate an output. During this time, designated as T
ate an output. During this time, designated as T
PU
,
code execution is disabled. T
PU
is applied every time
the device resumes operation after any power-down,
including Sleep mode.
including Sleep mode.
26.3.2
ON-CHIP REGULATOR AND BOR
PIC32MX1XX/2XX devices also have a simple brown-
out capability. If the voltage supplied to the regulator is
inadequate to maintain a regulated level, the regulator
Reset circuitry will generate a Brown-out Reset. This
event is captured by the BOR flag bit (RCON<1>). The
brown-out voltage levels are specific in
out capability. If the voltage supplied to the regulator is
inadequate to maintain a regulated level, the regulator
Reset circuitry will generate a Brown-out Reset. This
event is captured by the BOR flag bit (RCON<1>). The
brown-out voltage levels are specific in
.
FIGURE 26-2:
CONNECTIONS FOR THE
ON-CHIP REGULATOR
ON-CHIP REGULATOR
26.4
Programming and Diagnostics
PIC32MX1XX/2XX devices provide a complete range
of programming and diagnostic features that can
increase the flexibility of any application using them.
These features allow system designers to include:
• Simplified field programmability using two-wire
of programming and diagnostic features that can
increase the flexibility of any application using them.
These features allow system designers to include:
• Simplified field programmability using two-wire
In-Circuit Serial Programming™ (ICSP™)
interfaces
interfaces
• Debugging using ICSP
• Programming and debugging capabilities using
• Programming and debugging capabilities using
the EJTAG extension of JTAG
• JTAG boundary scan testing for device and board
diagnostics
PIC32 devices incorporate two programming and diag-
nostic modules, and a trace controller, that provide a
range of functions to the application developer.
nostic modules, and a trace controller, that provide a
range of functions to the application developer.
illustrates a block diagram of the
programming, debugging, and trace ports.
FIGURE 26-3:
BLOCK DIAGRAM OF
PROGRAMMING,
DEBUGGING AND TRACE
PORTS
PROGRAMMING,
DEBUGGING AND TRACE
PORTS
Note:
It is important that the low-ESR capacitor
is placed as close as possible to the V
is placed as close as possible to the V
CAP
pin.
V
DD
V
CAP
V
SS
PIC32
C
EFC(2,3)
3.3V
(1)
Note
1:
These are typical operating voltages. Refer to
for the full
operating ranges of V
DD
.
2:
It is important that the low-ESR capacitor is
placed as close as possible to the V
placed as close as possible to the V
CAP
pin.
3:
The typical voltage on the V
CAP
pin is 1.8V.
(10
μF typ)
TDI
TDO
TCK
TMS
JTAG
Controller
ICSP™
Controller
Core
JTAGEN
DEBUG<1:0>
ICESEL
PGEC1
PGED1
PGEC4
PGED4