參數(shù)資料
型號: PIC12C509AT-04I/MF
廠商: Microchip Technology
文件頁數(shù): 53/113頁
文件大小: 0K
描述: IC MCU OTP 1KX12 8-DFN
標準包裝: 3,300
系列: PIC® 12C
核心處理器: PIC
芯體尺寸: 8-位
速度: 4MHz
外圍設備: POR,WDT
輸入/輸出數(shù): 5
程序存儲器容量: 1.5KB(1K x 12)
程序存儲器類型: OTP
RAM 容量: 41 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 8-VDFN 裸露焊盤
包裝: 帶卷 (TR)
配用: AC164324-ND - MODULE SKT FOR MPLAB 8DFN/16QFN
XLT08DFN2-ND - SOCKET TRANSITION ICE 14DIP/8DFN
XLT08DFN-ND - SOCKET TRANSITION ICE 8DFN
AC164032-ND - ADAPTER PICSTART PLUS 8DFN/DIP
AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC
其它名稱: PIC12C509AT04I/MF
PIC12C5XX
DS40139E-page 44
1999 Microchip Technology Inc.
8.7
Time-Out Sequence, Power Down,
and Wake-up from SLEEP Status Bits
(TO/PD/GPWUF)
The TO, PD, and GPWUF bits in the STATUS register
can be tested to determine if a RESET condition has
been caused by a power-up condition, a MCLR or
Watchdog Timer (WDT) reset.
8.8
Reset on Brown-Out
A brown-out is a condition where device power (VDD)
dips below its minimum value, but not to zero, and then
recovers. The device should be reset in the event of a
brown-out.
To reset PIC12C5XX devices when a brown-out
occurs, external brown-out protection circuits may be
built, as shown in Figure 8-13 , Figure 8-14 and
FIGURE 8-13: BROWN-OUT PROTECTION
CIRCUIT 1
TABLE 8-7:
TO/PD/GPWUF STATUS
AFTER RESET
GPWUF
TO
PD
RESET caused by
0
WDT wake-up from
SLEEP
0
u
WDT time-out (not from
SLEEP)
01
0
MCLR wake-up from
SLEEP
01
1
Power-up
0u
u
MCLR not during SLEEP
1
0
Wake-up from SLEEP on
pin change
Legend: u = unchanged
Note 1: The TO, PD, and GPWUF bits maintain
their status (u) until a reset occurs. A low-
pulse on the MCLR input does not change
the TO, PD, and GPWUF status bits.
This circuit will activate reset when VDD goes below
Vz + 0.7V (where Vz = Zener voltage).
*Refer to Figure 8-7 and Table 11-1 for internal
weak pull-up on MCLR.
33k
10k
40k*
MCLR
PIC12C5XX
VDD
Q1
VDD
FIGURE 8-14: BROWN-OUT PROTECTION
CIRCUIT 2
FIGURE 8-15: BROWN-OUT PROTECTION
CIRCUIT 3
This brown-out circuit is less expensive, although
less accurate. Transistor Q1 turns off when VDD
is below a certain level such that:
*Refer to Figure 8-7 and Table 11-1 for internal
weak pull-up on MCLR.
VDD
R1
R1 + R2
= 0.7V
R2
40k*
MCLR
PIC12C5XX
R1
Q1
VDD
This
brown-out
protection
circuit
employs
Microchip Technology’s MCP809 microcontroller
supervisor. The MCP8XX and MCP1XX family 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
accomodate 5V and 3V systems.
MCLR
PIC12C5XX
VDD
Vss
RST
MCP809
VDD
bypass
capacitor
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