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BU9883FV-W
Datasheet
● Command cancel by start condition and stop condition
During command input, by continuously inputting start condition and stop condition, command can be cancelled.
(Refer to Figure 49.)
However, in ACK output area and during data read, SDA0 to 3 buses may output 'L', and in this case, start condition and
stop condition cannot be input, so reset is not available. Therefore, execute software reset. And when command is
cancelled by start, stop condition, during random read cycle, sequential read cycle, or current read cycle, internal setting
address is not determined, therefore, it is not possible to carry out current read cycle in succession. When to carry out read
cycle in accession, carry out random read cycle.
SCL0 to 3
SDA0 to 3
1
0
1
0
Start condition
Stop condition
Figure 49. Case of cancel by start, stop condition during slave address input
● I/O peripheral circuit
○ Pull up resistance of SDA0 to 3 terminal
SDA0 to 3 is NMOS open drain, so requires pull up resistance. As for this resistance value (R PU ), select an appropriate
value to this resistance value from microcontroller V IL , I L , and V OL 0 to 3-I OL characteristics of this IC. If R PU is large,
action frequency is limited. The smaller the R PU , the larger the consumption current at action.
○ Maximum value of R PU
The maximum value of R PU is determined by the following factors. The following V CC , SDA, R PU and I L correspond to
them of each port.
(1)SDA0 to 3 rise time to be determined by the capacitance (CBUS) of bus line of R PU and SDA0 to 3 should be tR or
below.
And AC timing should be satisfied even when SDA0 to 3 rise time is late.
(2)The bus electric potential
A
to be determined by input leak total (I L ) of device connected to bus at output of 'H' to
SDA0 to 3 bus and R PU should sufficiently secure the input 'H' level (V IH ) of microcontroller and EEPROM including
recommended noise margin 0.2V CC .
Vcc - I L R PU － 0.2Vcc ≧ V IH
Microcontroller
BU9883FV-W
∴
R PU ≦
0.8Vcc － V IH
I L
R PU
A
SDA terminal
Ex. ) When V CC =3V, I L =10 μ A, V IH =0.7 V CC ,
from (2)
IL
IL
Bus line
10 × 10
R PU ≦
0.8 × 3 － 0.7 × 3
-6
capacity
CBUS
≦ 300 [k Ω ]
Figure 50. I/O circuit diagram
○ Minimum value of R PU
The minimum value of R PU is determined by the following factors. The following V CC , V OL , I OL , and R PU correspond to
them of each port.
(1)When IC outputs LOW, it should be satisfied that V OLMAX =0.4V and I OLMAX =3mA.
V CC － V OL
R PU
≦ I OL
∴
R PU ≦
Vcc － V OL
I OL
(2)V OLMAX =0.4V should secure the input 'L' level (V IL ) of microcontroller and EEPROM including recommended noise
margin 0.1V CC .
V OLMAX ≦ V IL - 0.1 V CC
Ex. ) When V CC =3V, V OL =0.4V, I OL =3mA, microcontroller, EEPROM V IL =0.3V CC
from (1)
R PU ≧
≧
3 － 0.4
3 × 10
867 [ Ω ]
-3
And
V OL = 0.4 [V]
V IL = 0.3 × 3
= 0.9 [V]
○ Pull up resistance of SCL0 to 3 terminal
Therefore, the condition (2) is satisfied.
When SCL0 to 3 control is made at CMOS output port, there is no need, but in the case there is timing where SCL0 to 3
becomes 'Hi-Z', add a pull up resistance. As for the pull up resistance, one of several k ? to several ten k ? is
recommended in consideration of drive performance of output port of microcontroller.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
20/25
TSZ02201-0R2R0G100420-1-2
31.AUG.2012 Rev.001
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