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BU4342 데이터시트(PDF) 11 Page - Rohm |
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BU4342 데이터시트(HTML) 11 Page - Rohm |
11 / 16 page Datasheet 11/13 BU42xx series BU43xx series TSZ02201-0R7R0G300050-1-2 © 2013 ROHM Co., Ltd. All rights reserved. 22.May.2013 Rev.006 www.rohm.com TSZ22111 ・ 15 ・ 001 ● Circuit Applications 1) Examples of common power supply detection reset circuits Application examples of BU42xx series (Open Drain output type) and BU43xx series (CMOS output type) are shown below. CASE1: Power supply of microcontroller (VDD2) differs from the power supply of the reset detection (VDD1). Use an open drain output Type (BU42xx series) device with a load resistance RL as shown Fig.18. CASE2: Power supply of microcontroller (VDD1) is the same as the power supply of the reset detection (VDD1). Use a CMOS output type (BU43xx series) device or an open drain output type (BU42xx series) device with a pull up resistor between the output and VDD1. When a capacitance CL for noise filtering is connected to VouT pin (the reset signal input terminal of the microcontroller), please take into account the waveform of the rise and fall time 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 (BU42xx 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 BU43xx CIN GND CT RST CL (Capacitor for noise filtering) Micro controller Fig.19 CMOS Output type VDD1 BU42xx VDD2 GND RST CL (Capacitor for noise filtering) CT RL CIN Micro controller Fig.18 Open Drain Output type VDD1 VDD3 GND RST microcontroller CT RL VDD2 CT BU42xx NO.1 BU42xx NO.2 Fig.20 |
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