參數(shù)資料
型號(hào): PIC16C505-20E/P
廠商: Microchip Technology
文件頁(yè)數(shù): 30/90頁(yè)
文件大?。?/td> 0K
描述: IC MCU OTP 1KX12 14DIP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
標(biāo)準(zhǔn)包裝: 30
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 11
程序存儲(chǔ)器容量: 1.5KB(1K x 12)
程序存儲(chǔ)器類型: OTP
RAM 容量: 72 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 14-DIP(0.300",7.62mm)
包裝: 管件
配用: 309-1086-ND - ADAPTER 14-ZIF BD W/14-SO PLUGS
309-1085-ND - ADAPTER 14-DIP BD W/2 14-SO PLUG
PIC16C505
DS40192D-page 36
1999-2012 Microchip Technology Inc.
7.7
Time-Out Sequence, Power Down,
and Wake-up from SLEEP Status Bits
(TO/PD/RBWUF)
The TO, PD, and RBWUF 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.
7.8
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 PIC16C505 devices when a brown-out
occurs, external brown-out protection circuits may be
built, as shown in Figure 7-12 and Figure 7-13.
FIGURE 7-12: BROWN-OUT PROTECTION
CIRCUIT 1
TABLE 7-7:
TO/PD/RBWUF STATUS
AFTER RESET
RBWUF
TO
PD
RESET caused by
00
0
WDT wake-up from
SLEEP
00
u
WDT time-out (not from
SLEEP)
01
0
MCLR wake-up from
SLEEP
01
1
Power-up
0u
u
MCLR not during SLEEP
11
0
Wake-up from SLEEP on
pin change
Legend: u = unchanged
Note 1:
The TO, PD, and RBWUF bits maintain their
status (u) until a reset occurs. A low-pulse on the
MCLR input does not change the TO, PD, and
RBWUF status bits.
This circuit will activate reset when VDD goes below
Vz + 0.7V (where Vz = Zener voltage).
Note 1: Pin must be confirmed as MCLR.
33k
10k
40k*
VDD
MCLR(1)
PIC16C505
VDD
Q1
FIGURE 7-13: BROWN-OUT PROTECTION
CIRCUIT 2
FIGURE 7-14: 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:
Note 1: Pin must be confirmed as MCLR.
VDD
R1
R1 + R2
= 0.7V
R2
40k*
VDD
MCLR(1)
PIC16C505
R1
Q1
VDD
This brown-out protection circuit employs Microchip
Technology’s
MCP809
microcontroller
supervisor.
There
are
7
different
trip
point
selections
to
accommodate 5V to 3V systems.
MCLR
PIC12C5XX
VDD
VSS
RST
MCP809
VDD
bypass
capacitor
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