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BU9833GUL-W (2Kbit)
Datasheet
In I C BUS, it is recommended that SDA port is of open drain input / output. However, when to use COMS input / output
● Cautions on microcontroller connection
Rs
2
of tri state to SDA port, insert a series resistance Rs between the pull up resistance R PU and the SDA terminal of
EEPROM. This controls over protection of SDA terminal against surge. Therefore, even when SDA port is open drain
input / output, Rs can be used.
R PU
R S
SCL
SDA
“H” output of
ACK
microcontroller
“L” output of EEPROM
Microcontroller
EEPROM
Over current flows to SDA line by “H” output of
microcontroller and “L” output of EEPROM.
Figure 45. I/O circuit diagram
Figure 46. Input / output collision timing
○ Maximum value of Rs
The maximum value of Rs is determined by the following relations.
(1) SDA rise time to be determined by the capacity (CBUS) of bus line of R PU and SDA should be tR or below.
And AC timing should be satisfied even when SDA rise time is late.
(2) The bus electric potential A to be determined by RPU and Rs at the moment when EEPROM outputs “L” to SDA bus
should sufficiently secure the input “L” level (V IL ) of microcontroller including recommended noise margin 0.1V CC .
V CC
R PU
A
(V CC -V OL )×R S
R PU +R S
+
V OL +0.1V CC ≦ V IL
R S
I OL
V OL
∴
R S
≦
V IL -V OL -0.1V CC
1.1V CC -V IL
× R PU
Bus line
capacity CBUS
Example) When V CC =3V, V IL =0.3V CC , V OL =0.4V, R PU =20k Ω ,
V IL
Microcontroller
EEPROM
From (2)
R S
≦
0.3×3-0.4-0.1×3
1.1×3-0.3×3
×20×10 3
Figure 47. I/O circuit diagram
≦
1.67 [ k Ω ］
○ Minimum value of Rs
The minimum value of Rs is determined by over current at bus collision. When over current flows, noises in power source
line, and instantaneous power failure of power source may occur. When allowable over current is defined as I, the
following relation must be satisfied. Determine the allowable current in consideration of impedance of power source line
in set and so forth. Set the over current to EEPROM 10mA or below.
V CC
R S
≦
I
R PU
R S
"L" output
R S
≧
V CC
I
"H" output
Over current I
Example) When Vcc =3V, I = 10mA,
Microcontroller
EEPROM
R S
≧
3
10×10 -3
Figure 48. I/O Circuit diagram
≧
300 [Ω］
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
19/24
TSZ02201-0R2R0G100450-1-2
04.SEP.2012 Rev.001
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