- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376439 > X40021V14I-B (INTERSIL CORP) Dual Voltage Monitor with Intergrated CPU Supervisor PDF資料下載
參數(shù)資料
| 型號： | X40021V14I-B |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Dual Voltage Monitor with Intergrated CPU Supervisor |
| 中文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14 |
| 封裝： | 4.40 MM, PLASTIC, MO-153AC, TSSOP-14 |
| 文件頁數(shù)： | 4/24頁 |
| 文件大?。?/td> | 346K |
| 代理商： | X40021V14I-B |
4
FN8112.0
March 28, 2005
PRINCIPLES OF OPERATION
Power-on Reset
Applying power to the X40020/21 activates a Power-
on Reset Circuit that pulls the RESET/RESET pins
active. This signal provides several benefits.
– It prevents the system microprocessor from starting
to operate with insufficient voltage.
– It prevents the processor from operating prior to sta-
bilization of the oscillator.
– It allows time for an FPGA to download its configura-
tion prior to initialization of the circuit.
– It prevents communication to the EEPROM, greatly
reducing the likelihood of data corruption on power-up.
When V
CC
exceeds the device V
TRIP1
threshold value
for t
PURST
(selectable) the circuit releases the RESET
(X40021) and RESET (X40020) pin allowing the system
to begin operation.
Figure 1. Connecting a Manual Reset Push-Button
Manual Reset
By connecting a push-button directly from MR to
ground, the designer adds manual system reset capa-
bility. The MR pin is LOW while the push-button is
closed and RESET/RESET pin remains LOW for
t
PURST
or till the push-button is released and for t
PURST
thereafter. A weak pull up resistor is connected to the
MR pin.
Low Voltage V1 Monitoring
During operation, the X40020/21 monitors the V
CC
level and asserts RESET if supply voltage falls below
a preset minimum V
TRIP1
. The RESET signal prevents
the microprocessor from operating in a power fail or
brownout condition. The V1FAIL signal remains active
until the voltage drops below 1V. It also remains active
until V
CC
returns and exceeds V
TRIP1
for
t
PURST
.
Low Voltage V2 Monitoring
The X40020/21 also monitors a second voltage level and
asserts V2FAIL if the voltage falls below a preset mini-
mum V
TRIP2
. The V2FAIL signal is either ORed with
RESET to prevent the microprocessor from operating in
a power fail or brownout condition or used to interrupt the
microprocessor with notification of an impending power
failure. The V2FAIL signal remains active until the V
CC
drops below 1V (V
CC
falling). It also remains active until
V2MON returns and exceeds V
TRIP2
.
V2MON voltage monitor is powered by V
OUT.
If V
CC
and V
BATT
go away, V2MON cannot be monitored.
Figure 2. Two Uses of Multiple Voltage Monitoring
WATCHDOG TIMER
The Watchdog Timer circuit monitors the microprocessor
activity by monitoring the SDA and SCL pins. A standard
read or write sequence to any slave address byte
restarts the watchdog timer and prevents the WDO sig-
nal to go active. A minimum sequence to reset the
watchdog timer requires four microprocessor instructions
namely, a Start, Clock Low, Clock High and Stop. The
state of two nonvolatile control bits in the Status Register
determine the watchdog timer period. The microproces-
sor can change these watchdog bits by writing to the
X40020/21 control register (also refer to page 21).
MR
System
Reset
Manual
Reset
X40020
RESET
Unreg.
Supply
V
CC
5V
Reg
V2MON
X40020
Resistors selected so 3V appears on V2MON when unregulated
supply reaches 6V.
Unreg.
Supply
V
CC
X40021
RESET
V2FAIL
System
Reset
V
OUT
RESET
V2FAIL
V
OUT
System
Reset
Notice:
No external components required to monitor two voltages.
R
R
V2MON
5V
Reg
3V
Reg
X40020, 40021
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| X40021V14I-C | Dual Voltage Monitor with Intergrated CPU Supervisor |
| X40020 | Dual Voltage Monitor with Intergrated CPU Supervisor |
| X40020S14-A | Dual Voltage Monitor with Intergrated CPU Supervisor |
| X40020S14-B | Dual Voltage Monitor with Intergrated CPU Supervisor |
| X40020S14-C | Dual Voltage Monitor with Intergrated CPU Supervisor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X40021V14I-BT1 | 功能描述:IC VOLTAGE MONITOR DUAL 14-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:100 系列:- 類型:簡單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:- 復(fù)位:低有效 復(fù)位超時:最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
| X40021V14I-C | 功能描述:IC VOLTAGE MONITOR DUAL 14-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:100 系列:- 類型:簡單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:- 復(fù)位:低有效 復(fù)位超時:最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
| X40021V14I-CT1 | 功能描述:IC VOLTAGE MONITOR DUAL 14-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:100 系列:- 類型:簡單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:- 復(fù)位:低有效 復(fù)位超時:最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
| X400-22FA | 制造商:MOFLASH SIGNALLING 功能描述:BEACON XENON HIGH OUTPUT |
| X4003 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CPU Supervisor |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。