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參數(shù)資料
| 型號： | PIC24FJ64GB110T-I/PF |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PIC MCU FLASH 100TQFP |
| 標準包裝： | 1,000 |
| 系列： | PIC® 24F |
| 核心處理器： | PIC |
| 芯體尺寸： | 16-位 |
| 速度： | 32MHz |
| 連通性： | I²C，SPI，UART/USART，USB OTG |
| 外圍設(shè)備： | 欠壓檢測/復位，LVD，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 83 |
| 程序存儲器容量： | 64KB（22K x 24） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 16K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2 V ~ 3.6 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 16x10b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 100-TQFP |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | PIC24FJ64GB110T-I/PFTR |
2008-2011 Microchip Technology Inc.
DS80369N-page 15
PIC24FJ256GB110 FAMILY
2.4.1
CONSIDERATIONS FOR CERAMIC
CAPACITORS
In recent years, large value, low-voltage, surface
mount ceramic capacitors have become very cost
effective in sizes up to a few tens of microfarad. The
low-ESR, small physical size and other properties
make ceramic capacitors very attractive in many types
of applications.
Ceramic capacitors are suitable for use with the inter-
nal voltage regulator of this microcontroller. However,
some care is needed in selecting the capacitor to
ensure that it maintains sufficient capacitance over the
intended operating range of the application.
Typical low-cost 10 F ceramic capacitors are available
in X5R, X7R and Y5V dielectric ratings (other types are
also available, but are less common). The initial toler-
ance specifications for these types of capacitors are
often specified as ±10% to ±20% (X5R and X7R), or
-20%/+80% (Y5V). However, the effective capacitance
that these capacitors provide in an application circuit
will also vary based on additional factors, such as the
applied DC bias voltage and the temperature. The total
in-circuit tolerance is, therefore, much wider than the
initial tolerance specification.
The X5R and X7R capacitors typically exhibit satisfac-
tory temperature stability (ex: ±15% over a wide
temperature range, but consult the manufacturer’s data
sheets for exact specifications). However, Y5V capaci-
tors typically have extreme temperature tolerance
specifications of +22%/-82%. Due to the extreme
temperature tolerance, a 10 F nominal rated Y5V type
capacitor may not deliver enough total capacitance to
meet minimum internal voltage regulator stability and
transient response requirements. Therefore, Y5V
capacitors are not recommended for use with the inter-
nal voltage regulator if the application must operate
over a wide temperature range.
In addition to temperature tolerance, the effective
capacitance of large value ceramic capacitors can vary
substantially, based on the amount of DC voltage
applied to the capacitor. This effect can be very signifi-
cant, but is often overlooked or is not always
documented.
A typical DC bias voltage vs. capacitance graph for
16V, 10V and 6.3V rated capacitors is shown in
FIGURE 2-4
DC BIAS VOLTAGE vs.
CAPACITANCE
CHARACTERISTICS
When selecting a ceramic capacitor to be used with the
internal voltage regulator, it is suggested to select a
high-voltage rating, so that the operating voltage is a
small percentage of the maximum rated capacitor volt-
age. For example, choose a ceramic capacitor rated at
16V for the 2.5V core voltage. Suggested capacitors
are shown in Table 2-1.
-80
-70
-60
-50
-40
-30
-20
-10
0
10
5
101112
13
14
1516
17
DC Bias Voltage (VDC)
C
a
p
aci
tan
ce
Ch
ang
e
(%
)
01
2
3
4
6
7
8
9
16V Capacitor
10V Capacitor
6.3V Capacitor
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