- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄3884 > PIC18LF448-I/L (Microchip Technology)IC PIC MCU FLASH 8KX16 44PLCC PDF資料下載
參數(shù)資料
| 型號(hào)： | PIC18LF448-I/L |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 29/116頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC PIC MCU FLASH 8KX16 44PLCC |
| 標(biāo)準(zhǔn)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(shè)備： | 欠壓檢測(cè)/復(fù)位，LVD，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 33 |
| 程序存儲(chǔ)器容量： | 16KB（8K x 16） |
| 程序存儲(chǔ)器類(lèi)型： | 閃存 |
| EEPROM 大?。?/td> | 256 x 8 |
| RAM 容量： | 768 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2 V ~ 5.5 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 8x10b |
| 振蕩器型： | 外部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 包裝： | 管件 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)當(dāng)前第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)
PIC18FXX8
DS41159E-page 26
2006 Microchip Technology Inc.
3.1
Power-on Reset (POR)
A Power-on Reset pulse is generated on-chip when a
VDD rise is detected. To take advantage of the POR
circuitry, connect the MCLR pin directly (or through a
resistor) to VDD. This eliminates external RC compo-
nents usually needed to create a Power-on Reset
delay. A minimum rise rate for VDD is specified (refer to
parameter D004). For a slow rise time, see Figure 3-2.
When the device starts normal operation (exits the
Reset
condition),
device
operating
parameters
(voltage, frequency, temperature, etc.) must be met to
ensure operation. If these conditions are not met, the
device must be held in Reset until the operating condi-
tions are met. Brown-out Reset may be used to meet
the voltage start-up condition.
3.2
MCLR
PIC18FXX8 devices have a noise filter in the MCLR
Reset path. The filter will detect and ignore small
pulses.
It should be noted that a WDT Reset does not drive
MCLR pin low.
The behavior of the ESD protection on the MCLR pin
differs from previous devices of this family. Voltages
applied to the pin that exceed its specification can
result in both Resets and current draws outside of
device specification during the Reset event. For this
reason, Microchip recommends that the MCLR pin no
longer be tied directly to VDD. The use of an RC
network, as shown in Figure 3-2, is suggested.
FIGURE 3-2:
EXTERNAL POWER-ON
RESET CIRCUIT (FOR
SLOW VDD POWER-UP)
3.3
Power-up Timer (PWRT)
The Power-up Timer provides a fixed nominal time-out
(parameter #33), only on power-up from the POR. The
Power-up Timer operates on an internal RC oscillator.
The chip is kept in Reset as long as the PWRT is active.
The PWRT’s time delay allows VDD to rise to an accept-
able level. A configuration bit (PWRTEN in CONFIG2L
register) is provided to enable/disable the PWRT.
The power-up time delay will vary from chip to chip due
to VDD, temperature and process variation. See DC
parameter #33 for details.
3.4
Oscillator Start-up Timer (OST)
The Oscillator Start-up Timer (OST) provides a 1024
oscillator cycle (from OSC1 input) delay after the
PWRT delay is over (parameter #32). This additional
delay ensures that the crystal oscillator or resonator
has started and stabilized.
The OST time-out is invoked only for XT, LP, HS and
HS4 modes and only on Power-on Reset or wake-up
from Sleep.
3.5
PLL Lock Time-out
With the PLL enabled, the time-out sequence following
a Power-on Reset is different from other oscillator
modes. A portion of the Power-up Timer is used to pro-
vide a fixed time-out that is sufficient for the PLL to lock
to the main oscillator frequency. This PLL lock time-out
(TPLL) is typically 2 ms and follows the oscillator
start-up time-out (OST).
3.6
Brown-out Reset (BOR)
A configuration bit, BOREN, can disable (if clear/
programmed), or enable (if set), the Brown-out Reset
circuitry. If VDD falls below parameter D005 for greater
than parameter #35, the brown-out situation resets the
chip. A Reset may not occur if VDD falls below param-
eter D005 for less than parameter #35. The chip will
remain in Brown-out Reset until VDD rises above BVDD.
The Power-up Timer will then be invoked and will keep
the chip in Reset an additional time delay (parameter
#33). If VDD drops below BVDD while the Power-up
Timer is running, the chip will go back into a Brown-out
Reset and the Power-up Timer will be initialized. Once
VDD rises above BVDD, the Power-up Timer will
execute the additional time delay.
Note
1: External Power-on Reset circuit is required
only if the VDD power-up slope is too slow.
The diode D helps discharge the capacitor
quickly when VDD powers down.
2: R < 40 k
Ω is recommended to make sure that
the voltage drop across R does not violate
the device’s electrical specification.
3: R1 = 100
Ω to 1 kΩ will limit any current flow-
ing into MCLR from external capacitor C, in
the event of MCLR/VPP pin breakdown due to
Electrostatic Discharge (ESD) or Electrical
Overstress (EOS).
C
R1
R
D
VDD
MCLR
PIC18FXXX
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PIC18F448-E/P | IC MCU FLASH 8KX16 W/CAN 40-DIP |
| PIC18F448-E/L | IC MCU FLASH 8KX16 W/CAN 44-PLCC |
| PIC16LF874AT-I/L | IC MCU CMOS 4K FLASH LP 44-PLCC |
| PIC18F252T-E/SO | IC MCU CMOS 40MHZ 16K FLSH28SOIC |
| PIC17C766T-33E/PT | IC MCU CMOS 33MHZ 16K EPRM80TQFP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC18LF448T-I/L | 功能描述:8位微控制器 -MCU 16KB 768 RAM 34I/O 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
| PIC18LF448T-I/PT | 功能描述:8位微控制器 -MCU 16KB 768 RAM 34I/O 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
| PIC18LF44J10-I/ML | 功能描述:8位微控制器 -MCU 16 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
| PIC18LF44J10-I/P | 功能描述:8位微控制器 -MCU 16 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
| PIC18LF44J10-I/PT | 功能描述:8位微控制器 -MCU 16 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。