參數(shù)資料
型號(hào)： PIC17LC756AT-08I/L
廠商： Microchip Technology
文件頁數(shù)： 86/159頁
文件大?。?/td> 0K
描述： IC MCU OTP 16KX16 A/D 68PLCC
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： 8MHz
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)： 50
程序存儲(chǔ)器容量： 32KB（16K x 16）
程序存儲(chǔ)器類型： OTP
RAM 容量： 902 x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 12x10b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 68-LCC（J 形引線）
包裝： 帶卷 (TR)
其它名稱： PIC17LC756AT-08IL
2000 Microchip Technology Inc.
DS30289B-page 31
PIC17C7XX
5.1.5
BROWN-OUT RESET (BOR)
PIC17C7XX devices have on-chip Brown-out Reset
circuitry. This circuitry places the device into a RESET
when the device voltage falls below a trip point (BVDD).
This ensures that the device does not continue pro-
gram execution outside the valid operation range of the
device. Brown-out Resets are typically used in AC line
applications, or large battery applications, where large
loads may be switched in (such as automotive).
The BODEN configuration bit can disable (if clear/
programmed), or enable (if set) the Brown-out Reset
circuitry. If VDD falls below BVDD (typically 4.0 V,
paramter #D005 in electrical specification section), for
greater than parameter #35, the Brown-out situation
will reset the chip. A RESET is not guaranteed to occur
if VDD falls below BVDD for less than paramter #35. The
chip will remain in Brown-out Reset until VDD rises
above BVDD. The Power-up Timer and Oscillator Start-
up Timer will then be invoked. This will keep the chip in
RESET the greater of 96 ms and 1024 TOSC. If VDD
drops below BVDD while the Power-up Timer/Oscillator
Start-up Timer is running, the chip will go back into a
Brown-out Reset. The Power-up Timer/Oscillator Start-
up Timer will be initialized. Once VDD rises above
BVDD, the Power-up Timer/Oscillator Start-up Timer
will start their time delays. Figure 5-10 shows typical
Brown-out situations.
In some applications, the Brown-out Reset trip point of
the device may not be at the desired level. Figure 5-8
and Figure 5-9 are two examples of external circuitry
that may be implemented. Each needs to be evaluated
to determine if they match the requirements of the
application.
FIGURE 5-8:
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 1
FIGURE 5-9:
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 2
FIGURE 5-10:
BROWN-OUT SITUATIONS
Note:
Before using the on-chip Brown-out for a
voltage
supervisory
function,
please
review the electrical specifications to
ensure that they meet your requirements.
VDD
33k
10k
40 k
VDD
MCLR
PIC17CXXX
This circuit will activate RESET when VDD goes below
(Vz + 0.7V) where Vz = Zener voltage.
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
PIC17CXXX
R1
Q1
VDD
Greater of 96 ms
BVDD Max.
BVDD Min.
VDD
Internal
RESET
BVDD Max.
BVDD Min.
VDD
Internal
RESET
< 96 ms
BVDD Max.
BVDD Min.
VDD
Internal
RESET
and 1024 TOSC
Greater of 96 ms
and 1024 TOSC
Greater of 96 ms
and 1024 TOSC
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PIC17LC762-08/L 功能描述:8位微控制器 -MCU 16KB 678 RAM 66 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
PIC17LC762-08/PT 功能描述:8位微控制器 -MCU 16KB 678 RAM 66 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
PIC17LC762-08I/L 功能描述:8位微控制器 -MCU 16KB 678 RAM 66 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
PIC17LC762-08I/PT 功能描述:8位微控制器 -MCU 16KB 678 RAM 66 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
PIC17LC762T-08/L 功能描述:8位微控制器 -MCU LOW PWR 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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