参数资料
| 型号： | X40421V14I-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-TSSOP |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 2 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 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-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 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
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| X40426V14I | 功能描述:IC SUPERVISR CPU IIC LVS 14TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:- 复位:低有效 复位超时:最小为 100 ms 电压 - 阀值:4.38V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
| X40426V14I-2.7 | 功能描述:IC SUPERVISR CPU IIC LVS 14TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:- 复位:低有效 复位超时:最小为 100 ms 电压 - 阀值:4.38V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
| X40426V14I-2.7A | 功能描述:IC SUPERVISR CPU IIC LVS 14TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:- 复位:低有效 复位超时:最小为 100 ms 电压 - 阀值:4.38V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
| X40426V14I-2.7AT1 | 功能描述:IC SUPERVISR CPU IIC LVS 14TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:- 复位:低有效 复位超时:最小为 100 ms 电压 - 阀值:4.38V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
| X40426V14I-2.7T1 | 功能描述:IC SUPERVISR CPU IIC LVS 14TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:- 复位:低有效 复位超时:最小为 100 ms 电压 - 阀值:4.38V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
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