参数资料
型号: AT90S8535-8PI
厂商: Atmel
文件页数: 85/127页
文件大小: 0K
描述: IC MCU 8K FLSH 8MHZ A/D IT 40DIP
标准包装: 18
系列: AVR® 90S
核心处理器: AVR
芯体尺寸: 8-位
速度: 8MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 8KB(4K x 16)
程序存储器类型: 闪存
EEPROM 大小: 512 x 8
RAM 容量: 512 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 6 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 40-DIP(0.600",15.24mm)
包装: 管件
PIC16C71X
DS30272A-page 60
1997 Microchip Technology Inc.
FIGURE 8-14: EXTERNAL POWER-ON
RESET CIRCUIT (FOR SLOW
VDD POWER-UP)
Note 1: External Power-on Reset circuit is
required only if VDD power-up slope is too
slow. The diode D helps discharge the
capacitor quickly when VDD powers down.
2: R < 40 k
is recommended to make sure
that voltage drop across R does not violate
the device’s electrical specication.
3: R1 = 100
to 1 k will limit any current
owing into MCLR from external capacitor
C in the event of MCLR/VPP pin break-
down due to Electrostatic Discharge
(ESD) or Electrical Overstress (EOS).
C
R1
R
D
VDD
MCLR
PIC16CXX
FIGURE 8-15: EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 1
FIGURE 8-16: EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 2
Note 1: This circuit will activate reset when VDD
goes below (Vz + 0.7V) where Vz = Zener
voltage.
2: Internal brown-out detection on the
PIC16C710/711/715 should be disabled
when using this circuit.
3: Resistors should be adjusted for the char-
acteristics of the transistor.
VDD
33k
10k
40k
VDD
MCLR
PIC16CXX
Note 1: This brown-out circuit is less expensive,
albeit less accurate. Transistor Q1 turns
off when VDD is below a certain level
such that:
2: Internal brown-out detection on the
PIC16C710/711/715 should be disabled
when using this circuit.
3: Resistors should be adjusted for the
characteristics of the transistor.
VDD
R1
R1 + R2
= 0.7V
VDD
R2
40k
VDD
MCLR
PIC16CXX
R1
Q1
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