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參數(shù)資料
| 型號： | MAX8215MPD |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 【5V, 【12V (【15V) Dedicated Microprocessor Voltage Monitors |
| 中文描述： | 5-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP14 |
| 封裝： | PLASTIC, DIP-14 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 156K |
| 代理商： | MAX8215MPD |
M
±5V, ±12V (±15V ) Dedic ated
Mic roproc essor Voltage Monitors
_______________________________________________________________________________________
7
Adding hysteresis to a comparator creates two trip
points–one for the input voltage rising and one for the
input voltage falling. When the voltage at the
MAX8215/MAX8216 auxiliary comparator’s (noninvert-
ing) input falls, the threshold at which the comparator
switches equals the reference voltage connected to the
comparator’s inverting input. However, when the volt-
age at the noninverting input rises, the threshold
equals the reference voltage
plus
the amount of hys-
teresis voltage built into the part. The trip point is
somewhat more accurate when the hysteresis voltage
is not part of the threshold voltage (i.e., when the input
voltage is falling) because the tolerance of the hystere-
sis specification adds to the tolerance of the trip point.
Overvoltage and Undervoltage
Detec tion Circ uits
Figure 2 shows connection of the auxiliary comparator
as either an undervoltage or overvoltage comparator.
Hysteresis makes this circuit more accurate when the
input voltage is dropping as opposed to rising. Figure
3 illustrates the comparator’s operation. The input volt-
age’s direction determines at which of two trip points
the comparator switches. Thus, the diagram includes
arrows that indicate whether the input voltage is rising
or falling. The formulas are provided for determining
trip-point voltages for specified resistors and for ease
in calculating appropriate resistor ratios for particular
trip points.
The MAX8215/MAX8216 comparator outputs correctly
display a low level down to 0.8V supply voltage. This is
useful in undervoltage applications where the monitored
power supply is also the supply connected to the V
DD
pin. See the section Monitoring the Supply Voltage.
9
RB
1.24V REFERENCE
DOUT
MAX8215
MAX8216
VDD
DIN
+VS
RA
7
180k
V
=
R
+ R
B
)
(
V
REF
)
R
B
Figure 2. Undervoltage/Overvoltage Comparator Using the
Auxiliary Comparator
V
TRIP2
V
TRIP1
GND
V
DD
INPUT VOLTAGE
(V
S
)
OUTPUT
VOLTAGE
GND
HYST
1 + RA
V
)
TODETERMINE THE TRIP VOLTAGES
FROM PARTICULAR RESISTOR
VALUES:
TRIP1 =
V
REF
1 + RA
V
TRIP2 =
(V
REF
+ V
HYST
)
1 + RA
V
V
HYST
= 16mV TYP
TOCALCULATE THE REQUIRED
RESISTOR RATIOS FOR PARTICULAR
TRIP VOLTAGES:
TRIP1
- 1
RA = V
REF
TRIP2
RA = V
HYST
)
)
Figure 3. Undervoltage/Overvoltage Detector Waveforms and
Formulas
MAX8215
MAX8216
14
V
DD
8
PGND
0.1
μ
F
OUT1
UNDERVOLTAGE
DOUT
7
13
9
OVERVOLTAGE
3
2
+V
S
R1
GND
+5V
DIN
R2
+5V COMPARATOR IS ACTUATED WHEN V
FALLS TOTHE
COMPARATOR'S SPECIFIED TRIP LEVEL. THE AUXILIARY
COMPARATOR OUTPUT IS TRIPPED WHEN V
>
R1 + R2
)
VREF
R2
Figure 4. Monitoring Supply Powering the MAX8215/MAX8216
with Undervoltage and Overvoltage Comparators
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX8215EPD | 【5V, 【12V (【15V) Dedicated Microprocessor Voltage Monitors |
| MAX8216MJD | 【5V, 【12V (【15V) Dedicated Microprocessor Voltage Monitors |
| MAX8216MPD | 【5V, 【12V (【15V) Dedicated Microprocessor Voltage Monitors |
| MAX8216 | 8-Bit Parallel-Out Serial Shift Registers 14-CDIP -55 to 125 |
| MAX8216CSD | 【5V, 【12V (【15V) Dedicated Microprocessor Voltage Monitors |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8216 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:【5V, 【12V (【15V) Dedicated Microprocessor Voltage Monitors |
| MAX8216C/D | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:±5V, ±12V (±15V) Dedicated Microprocessor Voltage Monitors |
| MAX8216CPD | 功能描述:監(jiān)控電路 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 |
| MAX8216CPD+ | 功能描述:監(jiān)控電路 5/12/15V +/-Dedictd MPU Voltage Monitor 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 |
| MAX8216CSD | 功能描述:監(jiān)控電路 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 |
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