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參數(shù)資料
| 型號： | MC14578P |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 4/8頁 |
| 文件大小： | 0K |
| 描述： | IC SMOKE COMPARATOR MPWR 16-DIP |
| 標準包裝： | 25 |
| 系列： | * |
| 類型： | * |
| 應用： | * |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-DIP（0.300"，7.62mm） |
| 供應商設備封裝： | 16-PDIP |
| 包裝： | 管件 |
Sensors
4
Freescale Semiconductor
MC14578
Archived by Freescale Semiconductor, Inc., 2009
Archive
Information
Archive
Information
APPLICATIONS INFORMATION
Figure 3. Low-Battery Detector
EXAMPLE VALUES
Near the switchpoint, the comparator output in the circuit
of Figure 3. may chatter or oscillate. This oscillation appears
on the signal labelled OUTPUT. In some cases, the oscillation
in the transition region will not cause problems. For example,
an MPU reading OUTPUT could sample the signal two or
three times to ensure a solid level is attained. But, in a low
battery detector, this probably is not necessary.
To eliminate comparator chatter, hysteresis can be added
as shown in Figure 4.. The circuit of Figure 4. requires slightly
more operating current than the Figure 3. arrangement.
Figure 4. Adding Hysteresis
NOTE: IN + and IN – have very high input impedance. Interconnect to these pins should be as short as possible.
OUTPUT
Low-battery
Indicator
High = Battery Low
Low = Battery Ok
V +
R1
R2
D1
R3
V +
R4
3.9 M
D2
R5
6.8 k
16
7
6
5
4
3
2
1
12
11
10
9
8
15
14
13
MC14578
VDD
COMP OUT
IN +
NC
IN A
IN B
OUT A
OUT B
IN C
OUT C1
NC
BUFF OUT
IN –
RBIAS
VSS
OUT C2
R1
R2
R3
Nominal Tip Point
470 k
Ω
1.3 M
Ω
20 k
Ω
4.08 V
820 k
Ω
1.2 M
Ω
39 k
Ω
5.05 V
1.2 M
Ω
1.2 M
Ω
62 k
Ω
6.00 V
12
R6
15
R7
2
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