参数资料
| 型号： | X40020S14I-A |
| 厂商： | Intersil |
| 文件页数： | 5/24页 |
| 文件大小： | 0K |
| 描述： | IC VOLTAGE MONITOR DUAL 14-SOIC |
| 标准包装： | 50 |
| 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： | 高有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 2.9V，4.6V |
| 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： | 管件 |
X40020, 40021
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
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
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
Unreg.
Supply
R
5V
Reg
X40020
V CC
RESET
V2MON
V OUT
System
Reset
X40020
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
X40021
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 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 .
5
Notice: No external components required to monitor two voltages.
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).
FN8112.1
May 17, 2006
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