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BD5238G-TR Datasheet(PDF) 11 Page - Rohm |
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BD5238G-TR Datasheet(HTML) 11 Page - Rohm |
11 / 16 page Datasheet 11/13 BD52xx series BD53xx series TSZ02201-0R7R0G300040-1-2 © 2013 ROHM Co., Ltd. All rights reserved. 22.May.2013 Rev.006 www.rohm.com TSZ22111 ・ 15 ・ 001 ● Circuit Applications 1) Examples of a common power supply detection reset circuit Application examples of BD52xx series (Open Drain output type) and BD53xx series (CMOS output type) are shown below. CASE1: Power supply of the microcontroller (VDD2) differs from the power supply of the reset detection (VDD1). Use an open drain output type (BD52xx) device with a load resistance RL attached as shown Fig.18. CASE2: Power supply of the microcontroller (VDD1) is the same as the power supply of the reset detection (VDD1). Use a CMOS output type (BD53xx) device or an open drain output type (BD52xx) device 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). Please refer to Operational Notes for recommendations on resistor and capacitor values. 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 (BD52xx 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 BD52xx VDD2 GND CL ( Noise-filtering Capacitor ) CT RL RST Micro controller Fig.18 Open Drain Output Type CL ( Noise-filtering Capacitor ) VDD1 BD53xx CT GND RST Micro controller Fig.19 CMOS Output Type VDD1 VDD3 GND RST microcontroller CT RL VDD2 CT BD52xx NO.1 BD52xx NO.2 Fig.20 |
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