參數(shù)資料
型號(hào): MCV18ET-I/SO
元件分類: 微控制器/微處理器
英文描述: FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO18
封裝: 7.50 MM, LEAD FREE, SOIC-18
文件頁(yè)數(shù): 78/108頁(yè)
文件大?。?/td> 1509K
代理商: MCV18ET-I/SO
2009 Microchip Technology Inc.
DS41399A-page 71
MCV18E
FIGURE 9-7:
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 1
FIGURE 9-8:
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 2
FIGURE 9-9:
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 3
Note
1: This circuit will activate Reset when VDD goes
below (Vz + 0.7V) where Vz = Zener voltage.
2: Internal Brown-out Reset circuitry should be
disabled when using this circuit.
VDD
33k
10k
40k
VDD
MCLR
MCV18E
Q1
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 Reset should be disabled
when using this circuit.
3: Resistors should be adjusted for the
characteristics of the transistor.
VDD x
R1
R1 + R2
= 0.7 V
VDD
R2
40k
VDD
MCLR
MCV18E
R1
Q1
Note
1:
This brown-out protection circuit employs
Microchip Technology’s MCP809
microcontroller supervisor. The MCP8XX and
MCP1XX families of supervisors provide
push-pull and open collector outputs with
both high and low active Reset pins. There
are 7 different trip point selections to
accommodate 5V and 3V systems.
MCLR
MCV18E
VDD
Vss
RST
MCP809
VDD
bypass
capacitor
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