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BU45L412 Scheda tecnica(PDF) 10 Page - Rohm |
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BU45L412 Scheda tecnica(HTML) 10 Page - Rohm |
10 / 17 page www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ02201-0R7R0G300130-1-2 TSZ22111 ・ 15 ・ 001 10/14 17.May.2013 Rev.003 BU45Kxxxx, BU46Kxxxx, BU45Lxxxx, BU46Lxxxx series Datasheet ● Circuit Applications 1. Examples of a common power supply detection reset circuit. Application examples of BU45xxxxx series (Open Drain output type) and BU46xxxxx 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 (BU45xxxxx series) device with a load resistance RL as shown Fig.16. CASE2: Power supply of the microcontroller (VDD1) is same as the power supply of the reset detection (VDD1). Use a CMOS output type (BU46xxxxx) device or an open drain output type (BU45xxxxx) with pull up resistor between the output and VDD1. (As shown Fig.17) 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 voltage resets the microcontroller. Fig. 18 To reset the microcontroller when many independent power supplies are used in the system, OR connect an open drain output type (BU45xxxxx series) to the microcontroller’s input with pull-up resistor to the supply voltage of the microcontroller (VDD3) as shown in Fig. 18. By pulling-up to VDD3, output “High” voltage of micro-controller power supply is possible. Fig.16 Open Drain Output Type Fig.17 CMOS Output Type VDD1 VDD2 GND BU45xxxxx CL ( Noise-filtering Capacitor ) RL RST Micro controller CL ( Noise-filtering Capacitor ) VDD1 GND BU46xxxxx RST Micro controller VDD2 VDD1 VDD3 GND RST Micro controller RL BU45xxxxx BU45xxxxx |
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