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參數(shù)資料
| 型號(hào)： | ISL88021IU8FCZ |
| 廠商： | INTERSIL CORP |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | Triple Voltage Monitor with Adjustable Power-On-Reset and Undervoltage/ Overvoltage Monitoring Capability |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MO-187AA, MSOP-8 |
| 文件頁(yè)數(shù)： | 5/7頁(yè) |
| 文件大小： | 198K |
| 代理商： | ISL88021IU8FCZ |
5
FN8226.1
September 18, 2006
Manual Reset
The manual reset input (MR) allows the user to trigger a reset
by using a push-button switch or by signaling that pin low. The
MR input is an active low debounced input. By connecting a
push-button directly from MR to ground, the designer adds
manual system reset capability. Reset is asserted if the MR pin
is pulled low to less than 100mV for 1μs or longer while the
push-button is closed or a reset is signaled. After MR is
released, the reset outputs remain asserted for t
POR
. MR input
has an internal 20k
Ω
pull up resistor provided.
Figure 3 illustrates a typical application diagram for either IC
showing both reset outputs being used along with both a
manual and signalled reset configuration. The V
DD
and
V2MON thresholds are preset whereas the V3MON is capable
of UV (ISL88021) or OV (ISL88022) monitoring of a voltage
greater than or less than 0.6V, respectively.
Application Considerations
Follow good decoupling practices to prevent transients from
causing unwanted reset signaling due to switching noises
and short duration droops.
When using the C
POR
pin, reduce layout stray capacitance
on this pin to minimize effect on t
POR
timing. If no PCB
C
POR
pad is patterned, the t
POR
can be 160ms.
Using the ISL88021_22EVAL1 Platform
The ISL88021_22EVAL1 board is designed to provide both
immediate functional assessment and flexibility to the user.
Both ICs are the ‘HF’ variant having a V
DD
Vth of 4.64V, a
V2MON Vth of 3.09V and V3MON Vth of 0.6V. The top IC
position is the ISL88021 and is configured to monitor for
undervoltage (UV) compliance of a 5V, 3.3V and a 2.5V and
signaling the RESET and RESET outputs. The bottom
position is the ISL88022 variant, which is configured to
measure a 3.3V overvoltage (OV) in addition to UV on both
the 5V and 3.3V supplies. RESET and RESET is asserted for
at least t
POR
when these voltage go out of range. In both
cases V3MON interfaces with the monitored supply via a
simple resistor divider for comparison to the internal 0.6V
reference. A Manual Reset (MR) input is provided on both
ICs and is invoked by pulling this input LOW.
V3MON
C
POR
MR
PB
GND
RST
RST
TO DISPLAY
TO μP
RESET
SIGNAL
V
MON
> 0.6V
V2MON
V
DD
1.8V - 3.3V
3.3V - 5V
ISL88021
ISL88022
FIGURE 3. TYPICAL APPLICATION DIAGRAM
FIGURE 4. ISL88021_22EVAL1 SCHEMATIC AND PHOTO
ISL88021IU8HFZ
ISL88022IU8HFZ
FIGURE 5. ISL88022EVAL1 3.3V UV AND OV DETECTION
RESET# RESPONDING TO
MONITORED VOLTAGE. C
POR
PIN IS OPEN, t
POR
= 150ms
MONITORED VOLTAGE RISING AND FALLING RAMP
THROUGH THE PROGRAMMED UV AND OV THRESHOLDS
ISL88021, ISL88022
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| ISL88021IU8FCZ-TK | 功能描述:IC VOLTAGE MON TRIPLE UV 8-MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:低有效 復(fù)位超時(shí):最小為 600 ms 電壓 - 閥值:3.8V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) |
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| ISL88021IU8HEZ-TK | 功能描述:IC VOLTAGE MON TRIPLE UV 8-MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:低有效 復(fù)位超時(shí):最小為 600 ms 電壓 - 閥值:3.8V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) |
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