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BD46E251-TR Datasheet(PDF) 11 Page - Rohm |
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BD46E251-TR Datasheet(HTML) 11 Page - Rohm |
11 / 18 page 11/14 TSZ02201-0R7R0G300110-1-2 © 2013 ROHM Co., Ltd. All rights reserved. 27.Aug.2013 Rev.004 www.rohm.com TSZ22111・15・001 BD45Exxxx-M series BD46Exxxx-M series ●Circuit Applications 1) Examples of a common power supply detection reset circuit. Application examples of BD45Exxxx-M series (Open Drain output type) and BD46Exxxx-M 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 (BD45xx series) device with a load resistance RL as shown Fig.18. CASE2: Power supply of the microcontroller (VDD1) is same as the power supply of the reset detection (VDD1). Use a CMOS output type (BD46Exxxx-M) device or an open drain output type (BD45Exxxx-M) with a pull up resistor between the output and VDD1. 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. 20 To reset the microcontroller when many independent power supplies are used in the system, OR connect an open drain output type (BD45Exxxx-M 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. Fig.18 Open Drain Output Type Fig.19 CMOS Output Type VDD1 VDD2 GND BD45Exxxx-M CL (Noise-filtering Capacitor) RL RST Micro controller CL (Noise-filtering Capacitor) VDD1 GND BD46Exxxx-M RST Micro controller VDD2 VDD1 VDD3 GND RST Micro controller RL BD45Exxxx-M BD45Exxxx-M |
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