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參數(shù)資料
| 型號： | 12C508 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Test Prod Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:Gray; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1 RoHS Compliant: Yes |
| 中文描述： | 8引腳，8位CMOS微控制器 |
| 文件頁數(shù)： | 44/113頁 |
| 文件大?。?/td> | 1604K |
| 代理商： | 12C508 |
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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 (V
DD
)
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 8-15
FIGURE 8-13: BROWN-OUT PROTECTION
CIRCUIT 1
TABLE 8-7:
TO/PD/GPWUF STATUS
AFTER RESET
GPWUF
TO
PD
RESET caused by
0
0
0
WDT wake-up from
SLEEP
WDT time-out (not from
SLEEP)
MCLR wake-up from
SLEEP
Power-up
MCLR not during SLEEP
Wake-up from SLEEP on
pin change
0
0
u
0
1
0
0
0
1
1
u
1
1
u
0
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 V
DD
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
V
DD
Q1
V
DD
V
DD
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 V
DD
is below a certain level such that:
R1
R1 + R2
*Refer to Figure 8-7 and Table 11-1 for internal
weak pull-up on MCLR.
V
DD
= 0.7V
R2
40k*
MCLR
PIC12C5XX
R1
Q1
V
DD
V
DD
V
DD
This
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.
brown-out
protection
circuit
employs
MCLR
PIC12C5XX
V
DD
V
DD
Vss
RST
MCP809
V
DD
cbypass
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 12C508A | Hookup/Lead Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:White; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1; Outer Diameter:0.144" RoHS Compliant: Yes |
| 12C509 | Test Prod Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:White; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1 RoHS Compliant: Yes |
| 12C671 | Test Prod Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:White; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1 RoHS Compliant: Yes |
| 12C672 | Test Prod Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:Black; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1; Outer Diameter:0.144" RoHS Compliant: Yes |
| 12CE673 | HookUp/Lead Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:Black; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1; Outer Diameter:0.144" RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 12C508P | 制造商:Motorola Inc 功能描述: |
| 12C5B | 制造商:AMPERITE CO INC 功能描述:RELAY;TIME DELAY,12VLTG,CLOSED,,MINI |
| 12C5SB | 制造商:Olympic Controls Corporation 功能描述: |
| 12C5T | 制造商:OlympicControls Corp/Amperite Co 功能描述:Electromechanical Relay SPST-NC 3A 12VDC 12VAC Through Hole |
| 12C5XB | 制造商:OlympicControls Corp/Amperite Co 功能描述:Electromechanical Relay SPST-NC 3A 12VDC 12VAC Panel Mount |
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