s-1009c15s Seiko Instruments Inc., s-1009c15s Datasheet - Page 26

• Manufacturer Part Number: s-1009c15s
• Description: Super-low Current Consumption Super High-accuracy Voltage Detector With Delay Circuit External Delay Time Setting
• Manufacturer: Seiko Instruments Inc.

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SUPER-LOW CURRENT CONSUMPTION SUPER HIGH-ACCURACY VOLTAGE DETECTOR WITH DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING)
S-1009 Series
1. Microcomputer reset circuits
Application Circuit Examples
In microcomputers, when the power supply voltage is lower than the guaranteed operating voltage, an unspecified
operation may be performed or the contents of the memory register may be lost. When power supply voltage
returns to the normal level, the microcomputer needs to be initialized. Otherwise, the S-1009 Series may
malfunction after that.
Reset circuits to protect microcomputer in the event of current being momentarily switched off or lowered.
Using the S-1009 Series which has the low operating voltage, a high accuracy detection voltage and hysteresis,
reset circuits can be easily constructed as seen in Figure 26 and 27.
Caution
Figure 26 Example of reset circuit (S-1009C)
S-1009C
The above connection diagram and constant will not guarantee successful operation.
Perform thorough evaluation using the actual application to set the constant.
Microcomputer
Seiko Instruments Inc.
VDD
VSS
Figure 27 Example of reset circuit (S-1009N)
VDD1
(Only for Nch open drain output products)
S-1009N
Microcomputer
Rev.4.0
VDD2
VSS
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