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BU4948 Datasheet(PDF) 6 Page - Rohm |
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BU4948 Datasheet(HTML) 6 Page - Rohm |
6 / 9 page Technical Note 6/8 BU48 □□G, BU48□□F, BU48□□FVE, BU49□□G, BU49□□F, BU49□□FVE series www.rohm.com 2009.06 - Rev.C © 2009 ROHM Co., Ltd. All rights reserved. Circuit Applications 1) Examples of a common power supply detection reset circuit Application examples of BU48 □□G/F/FVE series (Open Drain output type) and BU49 □□G/F/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 (BU48 □□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 (BU43 □□G/FVE) or Open Drain Output Type (BU48 □□G/FVE) attached a load resistance (RL) between the output and VDD1. (As shown Fig.16) When a capacitance CL for noise filtering or 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) Examples of the power supply with resistor dividers In applications where the power supply input terminal (VDD) of an IC with resistor dividers, it is possible that a through-current will momentarily flow into the circuit when the output logic switches, resulting in malfunctions (such as output oscillatory state). (Through-current is a current that momentarily flows from the power supply (VDD) to ground (GND) when the output level switches from “High” to “Low” or vice versa.) Consider the use of BD48 □□ when the power supply input it with resistor dividers. Fig.17 VOUT R2 VDD BU48□□ BU49□□ GND R1 I1 V1 CIN CL VDD1 BU48□□□ VDD2 GND Microcontroller RST CL (Capac it or f or noise filtering) RL CIN CL (Capacitor for nois e filtering) VDD1 BU49□□□ Microcontroller RST CIN GND Fig.15 Open collector Output type Fig.16 CMOS Output type |
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