參數(shù)資料
型號： PIC18LF258-I/SO
廠商： Microchip Technology
文件頁數(shù)： 21/116頁
文件大小： 0K
描述： IC MCU CAN FLASH 16K LP 28-SOIC
產品培訓模塊： Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標準包裝： 27
系列： PIC® 18F
核心處理器： PIC
芯體尺寸： 8-位
速度： 40MHz
連通性： CAN，I²C，SPI，UART/USART
外圍設備： 欠壓檢測/復位，LVD，POR，PWM，WDT
輸入/輸出數(shù)： 22
程序存儲器容量： 32KB（16K x 16）
程序存儲器類型： 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量： 1.5K x 8
電壓 - 電源 (Vcc/Vdd)： 2 V ~ 5.5 V
數(shù)據(jù)轉換器： A/D 5x10b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
包裝： 管件
PIC18FXX8
DS41159E-page 18
2006 Microchip Technology Inc.
TABLE 2-2:
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
2.3
RC Oscillator
For timing insensitive applications, the “RC” and “RCIO”
device options offer additional cost savings. The RC
oscillator frequency is a function of the supply voltage,
the resistor (REXT) and capacitor (CEXT) values and the
operating temperature. In addition to this, the oscillator
frequency will vary from unit to unit due to normal
process parameter variation. Furthermore, the differ-
ence in lead frame capacitance between package types
will also affect the 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 2-2 shows how the RC
combination is connected.
In the RC Oscillator mode, the oscillator frequency
divided by 4 is available on the OSC2 pin. This signal
may be used for test purposes or to synchronize other
logic.
FIGURE 2-2:
RC OSCILLATOR MODE
The RCIO Oscillator mode functions like the RC mode,
except that the OSC2 pin becomes an additional
general purpose I/O pin. The I/O pin becomes bit 6 of
PORTA (RA6).
Osc Type
Crystal
Freq
Cap. Range
C1
Cap. Range
C2
LP
32.0 kHz
33 pF
200 kHz
15 pF
XT
200 kHz
47-68 pF
1.0 MHz
15 pF
4.0 MHz
15 pF
HS
4.0 MHz
15 pF
8.0 MHz
15-33 pF
20.0 MHz
15-33 pF
25.0 MHz
15-33 pF
These values are for design guidance only.
See notes on this page.
Crystals Used
32.0 kHz
Epson C-001R32.768K-A
±20 PPM
200 kHz
STD XTL 200.000KHz
±20 PPM
1.0 MHz
ECS ECS-10-13-1
±50 PPM
4.0 MHz
ECS ECS-40-20-1
±50 PPM
8.0 MHz
EPSON CA-301 8.000M-C
±30 PPM
20.0 MHz
EPSON CA-301 20.000M-C
±30 PPM
Note 1: Recommended values of C1 and C2 are
identical to the ranges tested (Table 2-1).
2: Higher capacitance increases the stability
of the oscillator but also increases the
start-up time.
3: Since each resonator/crystal has its own
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate
values
of
external
components.
4: Rs may be required in HS mode, as well
as XT mode, to avoid overdriving crystals
with low drive level specification.
Note:
If the oscillator frequency divided by 4
signal is not required in the application, it
is recommended to use RCIO mode to
save current.
OSC2/CLKO
CEXT
REXT
PIC18FXX8
OSC1
FOSC/4
Internal
Clock
VDD
VSS
Recommended values:
3 k
Ω ≤ REXT ≤ 100 kΩ
CEXT > 20 pF
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PIC18LF25J10-I/ML 功能描述:8位微控制器 -MCU 32 KB FL 1024 RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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