參數(shù)資料
型號： TC1040CEUA
廠商： Microchip Technology Inc.
英文描述： Linear Building Block . Dual Low Power Comparator and Voltage Reference with Shutdown
中文描述： 線性積木。雙低功率比較器和電壓參考有關(guān)斷
文件頁數(shù)： 5/14頁
文件大?。?/td> 444K
代理商： TC1040CEUA
2002 Microchip Technology Inc.
DS21345B-page 5
TC1040
4.2
Precision Battery Monitor
Figure 4-2 is a precision battery low/battery dead
monitoring circuit. Typically, the battery low output
warns the user that a battery dead condition is
imminent. Battery dead typically initiates a forced
shutdown to prevent operation at low internal supply
voltages (which can cause unstable system operation).
The circuit in Figure 4-2 uses a single TC1040, one-
half of a TC1029, and only six external resistors.
COMPA
and
COMPB
provide
detection using V
R
as a reference. Resistors R2 and
R4 set the detection threshold for BATT LOW, while
Resistors R1 and R7 set the detection threshold for
BATT FAIL. The component values shown assert
BATT LOW at 2.2V (typical) and BATT FAIL at 2.0
(typical). Total current consumed by this circuit is
typically 22
μ
A at 3V. Resistors R5 and R6 provide
hysteresis for comparators COMPA and COMPB,
respectively.
precision
voltage
4.3
External Hysteresis (Comparator)
Hysteresis can be set externally with two resistors
using positive feedback techniques (see Figure 4-3).
The design procedure for setting external comparator
hysteresis is as follows:
1.
Choose the feedback resistor R
C
. Since the
input bias current of the comparator is at most
100pA, the current through R
C
can be set to
100nA (i.e., 1000 times the input bias current)
and retain excellent accuracy. The current
through R
C
at the comparator’s trip point is V
R
/
R
C
where V
R
is a stable reference voltage.
Determine the hysteresis voltage (V
HY
) between
the upper and lower thresholds.
2.
3.
Calculate R
A
as follows:
EQUATION 4-1:
4.
Choose the rising threshold voltage for V
SRC
(V
THR
).
Calculate R
B
as follows:
5.
EQUATION 4-2:
6.
Verify
formulas:
the
threshold
voltages
with
these
V
SRC
rising:
EQUATION 4-3:
V
SRC
falling:
EQUATION 4-4:
R
A
R
C
V
V
DD
----------
=
R
B
V
R
R
A
×
---------------------
R
A
--1
–
R
C
--1
–
---------V
=
V
THR
V
R
(
)
R
A
(
)
R
A
--1
R
B
-1
R
C
--1
+
+
=
V
THF
V
THR
R
------------------------
V
R
C
–
=
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參數(shù)描述
TC1040CEUATR 功能描述:校驗器 IC Dual Lw Pwr & VR RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
TC1041 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Linear Building Block . Dual Low Power Comparator and Voltage Reference with Programmable Hysteresis
TC1041CEOA 功能描述:校驗器 IC Dual Lw Pwr & VR Hys RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
TC1041CEOATR 功能描述:校驗器 IC Dual Lw Pwr & VR Hys RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
TC1041CEUA 功能描述:校驗器 IC Dual Lw Pwr & VR Hys RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
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