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BU9829GUL-W (16Kbit)
1.3.2 Pull down resistance Rpd of input terminals
Datasheet
Microcontroller
V OHM
EEPROM
V IHE
Rpd
V OHM
≧
≦
V OHM
I OHM
V IHE
…①
…②
I OHM
“H” output
Rpd
“H” input
Example) When Vcc=5V, V IHE =3.5V, V OHM =2.4V, I OHM =2mA,
from the equation ① ,
2×10
Figure 49. Input terminals Pull down resistance
Rpd
∴ Rpd
≧
≧
2.4
-3
1.2 [k Ω ]
? V IHE : EEPROM V IH specifications
? V OHM : Microcontroller V OH specifications
? I OHM : Microcontroller I OH specifications
1.3.3 Pull up resistance Rpu of SO pin
With the value of Rpd to satisfy the above equation, V OHM
becomes 2.4V or higher, and with V IHE (=3.5V), the equation ② is
also satisfied.
Rpu
≧
V CC -V OLE
I OLE
…①
Microcontroller
V ILM
Rpu
I OLE
EEPROM
V OLE
V OLE
≦
V ILM
…②
“L” input
“L” output
Example) When Vcc=5V, V OLE =0.4V, V ILM =1.5V, I OLE =2.1mA,
from the equation ① ,
Figure 50. SO Pull up resistance
Rpu
∴ Rpu
≧
≧
5-0.4
2.1×10 -3
2.2 [k Ω ]
? V OLE : EEPROM V OL specifications
? I OLE : Microcontroller I OL specifications
? V ILM : Microcontroller V IL specifications
1.3.4 Pull up resistance Rpu of SO pin
With the value of Rpd to satisfy the above equation, V OLE
becomes 0.4V or higher, and with V ILM (=1.5V), the equation ② is
also satisfied.
EEPROM
Rpd
≧
V OHE
…①
I OHE
Microcontroller
V IHM
V OHE
V OHE
≧
V IHM
…②
Example) When Vcc=5V, V OHE =Vcc-0.5V, V IHM =Vccx0.7V, I OHE =0.4mA,
“H” input
Rpd
I OHE
from the equation ① ,
“H” output
0.4×10
Rpd
≧
5-0.5
-3
Figure 51. SO Pull down resistance
∴ Rpd
≧
11.3 [k Ω ]
? V OHE : EEPROM V OH specifications
With the value of Rpu to satisfy the above equation, V OHE
? I OHE
: EEPROM I OH specifications
becomes 4.5V or higher, and with V IHM (=3.5V), the equation ② is
? V IHM : Microcontroller V IH specifications
also satisfied.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
18/23
TSZ02201-0R2R0G100400-1-2
28.AUG.2012 Rev.001
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