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型號(hào): TDGL002
廠商: Microchip Technology
文件頁(yè)數(shù): 44/214頁(yè)
文件大?。?/td> 0K
描述: BOARD DEV CHIPKIT UNO32
標(biāo)準(zhǔn)包裝: 1
系列: PIC® 32MX
類型: MCU
適用于相關(guān)產(chǎn)品: MPLAB?,Arduino? Uno
所含物品:
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PIC32MX3XX/4XX
DS61143H-page 138
2011 Microchip Technology Inc.
26.3
On-Chip Voltage Regulator
All PIC32MX3XX/4XX device’s core and digital logic
are designed to operate at a nominal 1.8V. To simplify
system
designs,
most
devices
in
the
PIC32MX3XX/4XX incorporate an on-chip regulator
providing the required core logic voltage from VDD.
The internal 1.8V regulator is controlled by the
ENVREG pin. Tying this pin to VDD enables the regu-
lator, which in turn provides power to the core. A low
ESR capacitor (such as tantalum) must be connected
to the VCORE/VCAP pin (Figure 26-2). This helps to
maintain the stability of the regulator. The recom-
mended value for the filer capacitor is provided in
Tying the ENVREG pin to VSS disables the regulator. In
this case, separate power for the core logic at a nomi-
nal 1.8V must be supplied to the device on the
VCORE/VCAP pin.
Alternatively, the VCORE/VCAP and VDD pins can be tied
together to operate at a lower nominal voltage. Refer to
Figure 26-2 for possible configurations.
26.3.1
ON-CHIP REGULATOR AND POR
When the voltage regulator is enabled, it takes fixed
delay for it to generate output. During this time, desig-
nated as TPU, code execution is disabled. TPU is applied
every time the device resumes operation after any
power-down, including Sleep mode.
If the regulator is disabled, a separate Power-up Timer
(PWRT) is automatically enabled. The PWRT adds a
fixed
delay
of
TPWRT
at
device
start-up.
See
information on TPU AND TPWRT.
26.3.2
ON-CHIP REGULATOR AND BOR
When
the
on-chip
regulator
is
enabled,
PIC32MX3XX/4XX 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 Section 29.1
26.3.3
POWER-UP REQUIREMENTS
The on-chip regulator is designed to meet the power-up
requirements for the device. If the application does not
use the regulator, then strict power-up conditions must
be adhered to. While powering up, VCORE must never
exceed VDD by 0.3 volts.
FIGURE 26-2:
CONNECTIONS FOR THE ON-CHIP REGULATOR
Note:
It is important that the low ESR capacitor
is placed as close as possible to the
VCORE/VCAP pin.
VDD
ENVREG
VCORE/VCAP
VSS
PIC32MX
3.3V(1)
1.8V(1)
VDD
ENVREG
VCORE/VCAP
VSS
PIC32MX
CEFC
3.3V
Regulator Enabled (ENVREG tied to VDD):
Regulator Disabled (ENVREG tied to ground):
Note
1:
These are typical operating voltages. Refer to Section 29.1 “DC Characteristics” for the full operating ranges of VDD
and VCORE.
(10
μF typ)
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