參數(shù)資料
型號: PIC17C766T-33/L
廠商: Microchip Technology
文件頁數(shù): 43/159頁
文件大?。?/td> 0K
描述: IC MCU OTP 16KX16 A/D 84PLCC
標(biāo)準(zhǔn)包裝: 300
系列: PIC® 17C
核心處理器: PIC
芯體尺寸: 8-位
速度: 33MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 66
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: OTP
RAM 容量: 902 x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 16x10b
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 84-LCC(J 形引線)
包裝: 帶卷 (TR)
配用: AC164318-ND - MODULE SKT MPLAB PM3 84PLCC
DVA17XL841-ND - DEVICE ADAPTER FOR PIC17C762
DM173001-ND - KIT DEVELOPMENT PICDEM17
AC164027-ND - ADAPTER PICSTART PLUS 84PLCC
AC174012-ND - MODULE SKT PROMATEII 84PLCC
PIC17C7XX
DS30289B-page 20
2000 Microchip Technology Inc.
4.1.6
RC OSCILLATOR
For timing insensitive applications, the RC device
option offers additional cost savings. RC oscillator fre-
quency is a function of the supply voltage, the resistor
(REXT) and capacitor (CEXT) values, and the operating
temperature. In addition to this, oscillator frequency will
vary from unit to unit due to normal process parameter
variation. Furthermore, the difference in lead frame
capacitance between package types will also affect
oscillation frequency, especially for low CEXT values.
The user also needs to take into account variation due
to tolerance of external R and C components used.
Figure 4-7 shows how the R/C combination is con-
nected to the PIC17CXXX. For REXT values below
2.2 k
, the oscillator operation may become unstable,
or stop completely. For very high REXT values (e.g.
1M
), the oscillator becomes sensitive to noise,
humidity and leakage. Thus, we recommend to keep
REXT between 3 k
and 100 k.
Although the oscillator will operate with no external
capacitor (CEXT = 0 pF), we recommend using values
above 20 pF for noise and stability reasons. With little
or no external capacitance, oscillation frequency can
vary dramatically due to changes in external capaci-
tances, such as PCB trace capacitance or package
lead frame capacitance.
See Section 21.0 for RC frequency variation from part
to part due to normal process variation. The variation is
larger for larger R (since leakage current variation will
affect RC frequency more for large R) and for smaller
C (since variation of input capacitance will affect RC
frequency more).
See Section 21.0 for variation of oscillator frequency
due to VDD for given REXT/CEXT values, as well as fre-
quency variation due to operating temperature for
given R, C, and VDD values.
The oscillator frequency, divided by 4, is available on
the OSC2/CLKOUT pin and can be used for test pur-
poses or to synchronize other logic (see Figure 4-8 for
waveform).
FIGURE 4-7:
RC OSCILLATOR MODE
4.1.6.1
RC Start-up
As the device voltage increases, the RC will immedi-
ately start its oscillations once the pin voltage levels
meet the input threshold specifications (parameter
#D032 and parameter #D042 in the electrical specifica-
tion section). The time required for the RC to start oscil-
lating depends on many factors. These include:
Resistor value used
Capacitor value used
Device VDD rise time
System temperature
VDD
REXT
CEXT
VSS
OSC1
Internal
Clock
OSC2/CLKOUT
FOSC/4
PIC17CXXX
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