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BU9888FV-W датащи(PDF) 10 Page - Rohm |
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BU9888FV-W датащи(HTML) 10 Page - Rohm |
10 / 17 page Technical Note 10/16 BU9888FV-W www.rohm.com 2011.01 - Rev.A © 2011 ROHM Co., Ltd. All rights reserved. 4-2) DO is available in both pull up and pull down. Do output become “High-Z” in other READY / BUSY output timing than after data output at read command and write command. When malfunction occurs at “High-Z” input of the microcontroller port connected to DO, it is necessary to pull down and pull up DO. When there is no influence upon the microcontroller actions, DO may be OPEN. If DO is OPEN, and at timing to output status READY, at timing of CS=“H”, SK=“H”, DI=“H”, EEPROM recognizes this as a start bit, resets READY output, and DO=”High-Z”, therefore, READY signal cannot be detected. To avoid such output, pull up DO pin for improvement. Fig.38 READY output timing at DO=OPEN ○ Pull up resistance Rpu and pull down resistance Rpd of DO pin As for pull up and pull down resistance value, select an appropriate value to this resistance value from microcontroller VIH, VIL, and VOH, IOH, VOL, IOL characteristics of this IC. CS SK DI DO D0 BUSY READY High-Z Enlarged CS SK DI DO BUSY High-Z Improvement by DO pull up BUSY READY CS=SK=DI=”H” When DO=OPEN CS=SK=DI=”H” When DO=pull up DO “H” Microcontroller VILM “L” input IOLE VOLE “L” output EEPROM Rpu Fig.39 DO pull up resistance Rpu ≧ ・・・③ ∴ Rpu ≧ 2.2 [kΩ] VOLE ≦ VILM ・・・④ Rpu ≧ Example) When VCC =5V, VOLE=0.4V, IOLE=2.1mA, VILM=0.8V, from the equation ③, With the value of Rpu to satisfy the above equation, VOLE becomes 0.4V or below, and with VILM(=0.8V), the equation ④ is also satisfied. : EEPROM VOL specifications : EEPROM IOL specifications : Microcontroller VIL specifications ・ VOLE ・ IOLE ・ VILM Rpd ≧ ・・・⑤ ∴ Rpd ≧ 48 [kΩ] VOHE ≧ VIHM ・・・⑥ Rpd ≧ Example) When VCC =5V, VOHE=Vcc-0.2V, IOHE=0.1mA, VIHM=Vcc×0.7V from the equation ⑤, VOHE IOHE With the value of Rpd to satisfy the above equation, VOHE becomes 2.4V or below, and with VIHM (=3.5V), the equation ⑥ is also satisfied. : EEPROM VOH specifications : EEPROM IOH specifications : Microcontroller VIH specifications ・ VOHE ・ IOHE ・ VIHM 5-0.2 0.1×10 -3 Microcontroller VIHM “H” input IOHE VOHE “H” output EEPROM Rpd Fig.40 DO pull down resistance |
Аналогичный номер детали - BU9888FV-W |
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Аналогичное описание - BU9888FV-W |
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