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BU9829GUL-W_12 Datasheet, PDF (18/27 Pages) Rohm – WLCSP EEPROM | |||
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BU9829GUL-W (16Kbit)
Datasheet
1.3.2 Pull down resistance Rpd of input terminals
Microcontroller
VOHM
IOHM
âHâ output
EEPROM
VIHE
Rpd âHâ input
Rpd â§
VOHM â¦
VOHM
IOHM
VIHE
â¦â
â¦â¡
Example) When Vcc=5V, VIHE=3.5V, VOHM=2.4V, IOHM=2mA,
from the equationâ ,
Rpd â§
Figure 49. Input terminals Pull down resistance
â´Rpd â§
2.4
2Ã10-3
1.2 [kΩ]
ã»VIHE : EEPROM VIH specifications
ã»VOHM : Microcontroller VOH specifications
ã»IOHM : Microcontroller IOH specifications
With the value of Rpd to satisfy the above equation, VOHM
becomes 2.4V or higher, and with VIHE(=3.5V), the equationâ¡is
also satisfied.
1.3.3 Pull up resistance Rpu of SO pin
Microcontroller
Rpu
VILM
IOLE EEPROM
VOLE
âLâ input
âLâ output
Figure 50. SO Pull up resistance
ã»VOLE : EEPROM VOL specifications
ã»IOLE : Microcontroller IOL specifications
ã»VILM : Microcontroller VIL specifications
Rpu â§
VOLE â¦
VCC-VOLE
IOLE
VILM
â¦â
â¦â¡
Example) When Vcc=5V, VOLE=0.4V, VILM=1.5V, IOLE=2.1mA,
from the equationâ ,
Rpu â§
â´Rpu â§
5-0.4
2.1Ã10-3
2.2 [kΩ]
With the value of Rpd to satisfy the above equation, VOLE
becomes 0.4V or higher, and with VILM(=1.5V), the equationâ¡is
also satisfied.
1.3.4 Pull up resistance Rpu of SO pin
Microcontroller
VIHM
EEPROM
VOHE
âHâ input Rpd
IOHE
âHâ output
Figure 51. SO Pull down resistance
Rpd â§
VOHE â§
VOHE
IOHE
VIHM
â¦â
â¦â¡
Example) When Vcc=5V, VOHE=Vcc-0.5V, VIHM=Vccx0.7V, IOHE=0.4mA,
from the equationâ ,
Rpd â§
â´Rpd â§
5-0.5
0.4Ã10-3
11.3 [kΩ]
ã»VOHE : EEPROM VOH specifications
ã»IOHE : EEPROM IOH specifications
ã»VIHM : Microcontroller VIH specifications
With the value of Rpu to satisfy the above equation, VOHE
becomes 4.5V or higher, and with VIHM(=3.5V), the equation â¡ is
also satisfied.
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111ã»15ã»001
18/23
TSZ02201-0R2R0G100400-1-2
28.AUG.2012 Rev.001
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