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参数资料
| 型号： | TC52N4635ECT |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | EIAJ, SC-74A, SOT-23A, 5 PIN |
| 文件页数： | 5/10页 |
| 文件大小： | 530K |
| 代理商： | TC52N4635ECT |
TC52
DS21430B-page 4
2002 Microchip Technology Inc.
4.0
APPLICATIONS INFORMATION
Pin 2 (VIN1) acts as both the input to Voltage Detector
#1, as well as the power supply input for the chip. As
such, always assign VIN1 to monitor voltages between
1.5V and 10V. Failure to do this will result in unreliable
detector operation due to an out-of-tolerance supply
voltage. In high noise environments, it may be
necessary to install a small input bypass capacitor
(0.01
F to 0.1F) from VIN1 to ground to minimize on-
chip power supply noise.
4.1
Battery and Main Supply Monitor
The circuit shown in Figure 4-1 provides both a
processor supply monitor/reset function, as well as a
low
battery
detect
function.
As
shown,
the
TC52N3330ECT (N-Channel outputs) uses Detector 2
to monitor the system power supply rail. When the
power supply is 10% below its nominal output voltage
rating, the VOUT2 output is driven and held low. When
the power supply voltage is above 3.0V nominal, VOUT2
is driven to an open circuit and the combination of R1
and C1 provides a reset time out delay. Detector 1
monitors the voltage on the main supply battery. A low
battery condition is indicated when the battery voltage
falls to 3.3V, at which time the main processor is
interrupted to initiate a warning or system shutdown.
FIGURE 4-1:
SUPPLY MONITOR AND PROCESSOR SUPERVISOR
TC105
Step Down
DC/DC
Converter
6V
Battery
VIN2
VOUT2
GND
TC52N3330ECT
VIN1
VOUT1
RESET
Processor
INT
System
3.3V
+3.3V
R1
47K
+ C
1
F
–
+3.3V
+
–
R2
47K
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