參數(shù)資料
型號(hào): PIC24HJ12GP202-E/SO
廠商: Microchip Technology
文件頁(yè)數(shù): 80/262頁(yè)
文件大小: 0K
描述: IC PIC MCU FLASH 12K 28SOIC
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
標(biāo)準(zhǔn)包裝: 27
系列: PIC® 24H
核心處理器: PIC
芯體尺寸: 16-位
速度: 40 MIP
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 21
程序存儲(chǔ)器容量: 12KB(4K x 24)
程序存儲(chǔ)器類(lèi)型: 閃存
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 10x10b/12b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 28-SOIC(0.295",7.50mm 寬)
包裝: 管件
配用: AC164339-ND - MODULE SKT FOR PM3 28SOIC
DV164033-ND - KIT START EXPLORER 16 MPLAB ICD2
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PIC24HJ12GP201/202
DS70282E-page 170
2007-2011 Microchip Technology Inc.
19.2
On-Chip Voltage Regulator
All of the PIC24HJ12GP201/202 devices power their
core digital logic at a nominal 2.5V. This can create a
conflict for designs that are required to operate at a
higher typical voltage, such as 3.3V. To simplify system
design, all devices in the PIC24HJ12GP201/202 family
incorporate an on-chip regulator that allows the device
to run its core logic from VDD.
The regulator provides power to the core from the other
VDD pins. When the regulator is enabled, a low-ESR
(less than 5 ohms) capacitor (such as tantalum or
ceramic) must be connected to the VCAP pin
(Figure 19-1). This helps to maintain the stability of the
regulator. The recommended value for the filter capac-
itor is provided in Table 22-13 located in Section 22.1
On a POR
, it takes approximately 20 μs for the on-chip
voltage regulator to generate an output voltage. During
this time, designated as TSTARTUP, code execution is
disabled. TSTARTUP is applied every time the device
resumes operation after any power-down.
FIGURE 19-1:
CONNECTIONS FOR THE
ON-CHIP VOLTAGE
REGULATOR(1,2,3)
19.3
BOR: Brown-out Reset (BOR)
The Brown-out Reset module is based on an internal
voltage reference circuit that monitors the regulated
voltage VCAP. The main purpose of the BOR module is
to generate a device Reset when a brown-out condition
occurs. Brown-out conditions are generally caused by
glitches on the AC mains (for example, missing por-
tions of the AC cycle waveform due to bad power trans-
mission lines, or voltage sags due to excessive current
draw when a large inductive load is turned on).
A BOR generates a Reset pulse, which resets the
device. The BOR selects the clock source, based on
the device Configuration bit values (FNOSC<2:0> and
POSCMD<1:0>).
If an oscillator mode is selected, the BOR activates the
Oscillator Start-up Timer (OST). The system clock is
held until OST expires. If the PLL is used, the clock is
held until the LOCK bit (OSCCON<5>) is ‘1’.
Concurrently, the PWRT time-out (TPWRT) will be
applied before the internal Reset is released. If
TPWRT = 0 and a crystal oscillator is being used, a
nominal delay of TFSCM = 100 is applied. The total
delay in this case is TFSCM.
The BOR Status bit (RCON<1>) is set to indicate that a
BOR has occurred. The BOR circuit continues to oper-
ate while in Sleep or Idle modes and resets the device
should VDD fall below the BOR threshold voltage.
Note:
It is important for low-ESR capacitors to
be placed as close as possible to the VCAP
pin.
Note
1:
These are typical operating voltages. Refer
for the full operating
ranges of VDD and VCAP.
2:
It is important for low-ESR capacitors to be
placed as close as possible to the VCAP
pin.
3:
Typical VCAP pin voltage = 2.5V when
VDD ≥ VDDMIN.
VDD
VCAP
VSS
PIC24H
CEFC
3.3V
10 F
Tantalum
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