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BD5341 Datasheet(PDF) 6 Page - Rohm |
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BD5341 Datasheet(HTML) 6 Page - Rohm |
6 / 10 page Technical Note 6/9 BD52 □□G, BD52□□FVE, BD53□□G, BD53□□FVE series www.rohm.com 2009.06 - Rev.B © 2009 ROHM Co., Ltd. All rights reserved. Circuit Applications 1) Examples of a common power supply detection reset circuit Application examples of BD52 □□G/FVE series (Open Drain output type) and BD53 □□G/FVE series (CMOS output type) are shown below. CASE1: the power supply of the microcontroller (VDD2) differs from the power supply of the reset detection (VDD1). Use the open drain output type (BD52 □□G/FVE) attached 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 (BD53 □□G/FVE) or open drain output type (BD52 □□G/FVE) attached a load resistance (RL) between the output and Vdd1. (As shown Fig.16) When a capacitance CL for noise filtering 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 voltages resets the microcontroller. When there are many power supplies of the system, power supplies VDD1 and VDD2 are being monitored separately, and it is necessary to reset the microcomputer, it is possible to use an OR connection on the open drain output type BD52 □□G/FVE series to pull-up to the desired voltage (VDD3) as shown in Fig.17 and make the output “High” voltage matches the power supply voltage VDD3 of the microcontroller. VDD1 BD52□□□ VDD2 GND Microcontroller CL (Noise-filtering Capacitor) ) CT RL Fig.18 Open Collector Output Type CL (Noise-filtering Capacitor) VDD1 BD53□□□ Microcontroller CT GND Fig.19 CMOS Output Type VDD1 VDD3 GND RST microcontroller CT RL VDD2 CT BD52□□□ NO.1 BD52□□□ NO.2 Fig.20 |
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