參數(shù)資料
型號(hào)： PIC17C7X
文件頁(yè)數(shù)： 10/71頁(yè)
文件大小： 1173K
代理商： PIC17C7X
PIC17C4X
DS30412C-page 18
1996 Microchip Technology Inc.
FIGURE 4-5:
OSCILLATOR START-UPTIME
FIGURE 4-6:
USING ON-CHIP POR
FIGURE 4-7:
BROWN-OUT PROTECTION
CIRCUIT 1
VDD
MCLR
OSC2
OST TIME_OUT
PWRT TIME_OUT
INTERNAL RESET
TOSC1
TOST
TPWRT
This gure shows in greater detail the timings involved
with the oscillator start-up timer. In this example the
low frequency crystal start-up time is larger than
power-up time (TPWRT).
Tosc1 = time for the crystal oscillator to react to an
oscillation level detectable by the Oscillator Start-up
Timer (ost).
TOST = 1024TOSC.
VDD
MCLR
PIC17CXX
VDD
This circuit will activate reset when VDD goes below
(Vz + 0.7V) where Vz = Zener voltage.
VDD
33k
10k
40 k
VDD
MCLR
PIC17CXX
FIGURE 4-8:
PIC17C42 EXTERNAL
POWER-ON RESET CIRCUIT
(FOR SLOW VDD
POWER-UP)
FIGURE 4-9:
BROWN-OUT PROTECTION
CIRCUIT 2
Note 1: An external Power-on Reset circuit is
required only if VDD power-up time is too
slow. The diode D helps discharge the
capacitor quickly when VDD powers
down.
2: R < 40 k
is recommended to ensure
that the voltage drop across R does not
exceed 0.2V (max. leakage current spec.
on the MCLR/VPP pin is 5
A). A larger
voltage drop will degrade VIH level on the
MCLR/VPP pin.
3: R1 = 100
to 1 k will limit any current
owing into MCLR from external capaci-
tor C in the event of MCLR/VPP pin
breakdown due to Electrostatic Dis-
charge (ESD) or (Electrical Overstress)
EOS.
C
R1
R
D
VDD
MCLR
PIC17C42
VDD
This brown-out circuit is less expensive, albeit less
accurate. Transistor Q1 turns off when VDD is below a
certain level such that:
VDD
R1
R1 + R2
= 0.7V
R2
40 k
VDD
MCLR
PIC17CXX
R1
Q1
VDD
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC17LC42A-08/L 功能描述:8位微控制器 -MCU 4KB 232 RAM 33 I/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
PIC17LC42A-08/P 功能描述:8位微控制器 -MCU 4KB 232 RAM 33 I/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
PIC17LC42A-08/PQ 功能描述:8位微控制器 -MCU 4KB 232 RAM 33 I/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
PIC17LC42A-08/PT 功能描述:8位微控制器 -MCU 4KB 232 RAM 33 I/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
PIC17LC42A-08I/L 功能描述:8位微控制器 -MCU 4KB 232 RAM 33 I/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
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