参数资料
| 型号： | X40420S14I-CT1 |
| 厂商： | Intersil |
| 文件页数： | 5/25页 |
| 文件大小： | 0K |
| 描述： | IC VOLT MON DUAL SUP/SW 14-SOIC |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 2 |
| 输出： | 开路漏极，开路漏极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 1.6V，2.9V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOICN |
| 包装： | 带卷 (TR) |
X40420, X40421
PRINCIPLES OF OPERATION
Power-on Reset
Applying power to the X40420, X40421 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
Low Voltage V2 Monitoring
The X40420, X40421 also monitors a second voltage
level and asserts V2FAIL if the voltage falls below a pre-
set minimum V TRIP2 . The V2FAIL signal is either ORed
with RESET to prevent the microprocessor from operat-
ing in a power fail or brownout condition or used to inter-
rupt 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
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
(X40421) and RESET (X40420) pin allowing the system
to begin operation.
Figure 1. Connecting a Manual Reset Push-Button
Unreg.
Supply
R
5V
Reg
X40420
V CC
RESET
V2MON
V OUT
System
Reset
X 40420, X4042 1
R
V2FAIL
System
Reset
RESET
MR
Resistors selected so 3V appears on V2MON when unregulated
supply reaches 6V.
V OUT
Manual
Reset
Unreg.
Supply
5V
Reg
X40421
V CC
Manual Reset
By connecting a push-button directly from MR to
3V
Reg
RESET
V2MON
V2FAIL
System
Reset
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 X40420, X40421 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 .
5
Notice: No external components required to monitor two voltages.
WATCHDOG TIMER
The Watchdog Timer circuit monitors the microproces-
sor 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 signal 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 microprocessor can change these watch-
dog bits by writing to the X40420, X40421 control reg-
ister.
May 25, 2006
相关PDF资料 |
PDF描述 |
|---|---|
| X40420S14I-C | IC VOLT MON DUAL SUP/SW 14-SOIC |
| X40420S14I-BT1 | IC VOLT MON DUAL SUP/SW 14-SOIC |
| MAX1585ETJ+T | IC DGTL CAM PWR-SUP 5CH 32TQFN |
| X40420S14I-B | IC VOLT MON DUAL SUP/SW 14-SOIC |
| MAX1584ETJ+T | IC DGTL CAM PWR-SUP 5CH 32TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| X40420S14IZ-A | 制造商:Intersil Corporation 功能描述:PROCESSOR SUPERVISOR 4.6V/2.9V 3000UA 14SOIC - Rail/Tube |
| X40420S14IZ-AT1 | 制造商:Intersil Corporation 功能描述:PROCESSOR SUPERVISOR 4.6V/2.9V 3000UA 14SOIC - Tape and Reel 制造商:Intersil Corporation 功能描述:Supervisory Circuits DL VAGE CPU SUPS HI IND VTRIP1 4 6 |
| X40420S14IZ-B | 制造商:Intersil Corporation 功能描述:PROCESSOR SUPERVISOR 4.6V/2.6V 3000UA 14SOIC - Rail/Tube |
| X40420S14IZ-BT1 | 制造商:Intersil Corporation 功能描述:PROCESSOR SUPERVISOR 4.6V/2.6V 3000UA 14SOIC - Tape and Reel |
| X40420S14Z-A | 制造商:Intersil Corporation 功能描述:PROCESSOR SUPERVISOR 4.6V/2.9V 3000UA 14SOIC - Rail/Tube |
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