
2011-2012 Microchip Technology Inc.
Preliminary
DS61168D-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
PIC32MX1XX/2XX family incorporate an on-chip regu-
lator providing the required core logic voltage from
VDD.
A low-ESR capacitor (such as tantalum) must be
helps to maintain the stability of the regulator. The
recommended value for the filter capacitor is provided
26.3.1
ON-CHIP REGULATOR AND POR
It takes a fixed delay for the on-chip regulator to generate
an output. During this time, designated as TPU, code
execution is disabled. TPU is applied every time the
device resumes operation after any power-down,
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
FIGURE 26-2:
CONNECTIONS FOR THE
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
In-Circuit Serial Programming (ICSP)
interfaces
Debugging using ICSP
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.
FIGURE 26-3:
BLOCK DIAGRAM OF
PROGRAMMING,
DEBUGGING AND TRACE
PORTS
Note:
It is important that the low-ESR capacitor
is placed as close as possible to the VCAP
pin.
VDD
VCAP
VSS
PIC32
CEFC(2,3)
3.3V(1)
Note 1:
These are typical operating voltages. Refer to
operating ranges of VDD.
2:
It is important that the low-ESR capacitor is
placed as close as possible to the VCAP pin.
3:
The typical voltage on the VCAP 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