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參數(shù)資料
| 型號： | TC1271ATCVRCTR |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Voltage Supervisor with Manual Reset Input |
| 中文描述： | 電壓監(jiān)控器，帶有手動復(fù)位輸入 |
| 文件頁數(shù)： | 24/40頁 |
| 文件大小： | 384K |
| 代理商： | TC1271ATCVRCTR |
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TC1270A/70AN/71A
DS22035B-page 24
2007 Microchip Technology Inc.
5.4
Modifying The Trip Point, V
TRIP
Although the TC127XA device has a fixed voltage trip
point (V
TRIP
), it is sometimes necessary to make
custom adjustments. This can be accomplished by
connecting an external resistor divider to the TC127XA
V
DD
pin. This causes the V
SOURCE
voltage to be at a
higher voltage than when the TC127XA input equals
it’s V
TRIP
voltage (
Figure 5-5
).
To maintain detector accuracy, the bleeder current
through the divider should be significantly higher than
the 15 μA maximum operating current required by the
TC127XA. A reasonable value for this bleeder current
is 1 mA (67 times the 10 μA required by the TC127XA).
For example, if V
TRIP
= 2V and the desired trip point is
2.5V, the value of R
1
+ R
2
is 2.5 k
Ω
(2.5V/1 mA). The
value of R
1
+ R
2
can be rounded to the nearest stan-
dard value and plugged into the equation of
Figure 5-5
to calculate values for R
1
and R
2
. 1% tolerance resis-
tors are recommended.
FIGURE 5-5:
External Resistor Divider.
Modify Trip-Point using
5.5
MOSFET Low-Drive Protection
Low operating power and small physical size make the
TC1270AN series ideal for many voltage detector
applications.
Figure 5-6
shows a low-voltage gate drive
protection circuit that prevents overheating of the
logic-level MOSFET due to insufficient gate voltage.
When the input signal is below the threshold of the
TC1270AN, its output grounds the gate of the
MOSFET.
FIGURE 5-6:
Protection.
MOSFET Low-Drive
TC127XA
V
DD
RST
or RST
V
SS
R
1
V
SOURCE
R
2
VSOURCE
R
+
R
1
R
2
---------1
×
VTRIP
=
Where:
Note:
In this example, V
SOURCE
must be
greater than (V
TRIP
).
V
SOURCE
V
TRIP
=
=
Voltage to be monitored
Threshold Voltage setting
V
DD
RST
V
SS
TC1270AN
270
Ω
(1)
MTP3055EL
V
DD
R
L
V
TRIP
Note 1:
This resistance needs to be properly
sized for the selected Trip point voltage
related to the V
OL
operation.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TC1271ATVCTTR | 功能描述:監(jiān)控電路 5Pin uP Reset Mon 4.63V Reset Thresh RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TC1271ATVRCTR | 功能描述:監(jiān)控電路 4Pin uP Reset Mon 3.08V Reset Thresh RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TC1271FERC | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:4-Pin レP Reset Monitors |
| TC1271FERCTR | 功能描述:監(jiān)控電路 4-Pin uP 1.75V Reset RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TC1271LERC | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:4-Pin レP Reset Monitors |
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