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BU4926 Datasheet(PDF) 11 Page - Rohm |
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BU4926 Datasheet(HTML) 11 Page - Rohm |
11 / 16 page Datasheet 11/13 BU48xx series BU49xx series TSZ02201-0R7R0G300060-1-2 © 2014 ROHM Co., Ltd. All rights reserved. 03.Feb.2014 Rev.010 www.rohm.com TSZ22111・15・001 ●Circuit Applications 1) Examples of a common power supply detection reset circuit Application examples of BU48xx series (Open Drain output type) and BU49xx series (CMOS output type) are shown below. CASE1:The power supply of the microcontroller (VDD2) differs from the power supply of the reset detection (V DD1). Use the Open Drain Output Type (BU48xx series). Attach a load resistance (RL) between the output and VDD2. (As shown Fig.15) CASE2:The power supply of the microcontroller (VDD1) is same as the power supply of the reset detection (VDD1). Use CMOS output type (BU43xx series) or Open Drain Output Type (BU48xx series). Attach a load resistance (RL) between the output and VDD1. (As shown Fig.16) When a capacitance CL for noise filtering for setting the output delay time is connected to the VOUT pin (the reset signal input terminal of the microcontroller), please take into account the waveform of the rise and fall of the output voltage (VOUT). 2) The following is an example of a circuit application in which an OR connection between two types of detection voltage resets the microcontroller. To reset the microcontroller when many independent power supplies are used in the system, OR connect an open drain output type (BU48xx series) to the microcontroller’s input with pull-up resistor to the supply voltage of the microcontroller (VDD3) as shown in Fig. 20. By pulling-up to VDD3, output “High” voltage of micro-controller power supply is possible. VDD1 BU48xx VDD2 GND CL (Capacitor for noise filtering) RL CIN RST Micro controller CL (Capacitor for noise filtering) VDD1 BU49xx CIN GND RST Micro controller Fig.15 Open Drain Output type Fig.16 CMOS Output type VDD1 VDD3 GND RST microcontroller CT RL VDD2 CT BU48Exxx NO.1 BU48xx NO.2 Fig.17 |
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