Datasheet

PIC32MX5XX/6XX/7XX
DS60001156H-page 350  2009-2013 Microchip Technology Inc.
28.3 On-Chip Voltage Regulator
All PIC32MX5XX/6XX/7XX devices’ core and digital
logic are designed to operate at a nominal 1.8V. To
simplify system designs, most devices in the PIC32MX-
5XX/6XX/7XX family incorporate an on-chip regulator
providing the required core logic voltage from V
DD.
A low-ESR capacitor (such as tantalum) must be
connected to the V
CAP pin (see Figure 28-2). This
helps to maintain the stability of the regulator. The
recommended value for the filter capacitor is provided
in Section 31.1 “DC Characteristics”.
28.3.1 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. T
PU is applied every time the
device resumes operation after any power-down,
including Sleep mode.
28.3.2 ON-CHIP REGULATOR AND BOR
PIC32MX5XX/6XX/7XX 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 (BOR). This event is captured by the BOR flag
bit (RCON<1>). The brown-out voltage levels are
specified in Section 31.1 “DC Characteristics”.
FIGURE 28-2: CONNECTIONS FOR THE
ON-CHIP REGULATOR
28.4 Programming and Diagnostics
PIC32MX5XX/6XX/7XX 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 28-3: 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)
3.3V
(1)
Note 1: These are typical operating voltages. Refer to
Section 31.1 “DC Characteristics” 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
CAP pin.
(10 F typical)
TDI
TDO
TCK
TMS
JTAG
Controller
ICSP™
Controller
Core
JTAGEN DEBUG<1:0>
Instruction Trace
Controller
DEBUG<1:0>
ICESEL
PGEC1
PGED1
PGEC2
PGED2
TRCLK
TRD0
TRD1
TRD2
TRD3