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BR24C21xxx Series (1K)
○ Minimum R PU
The minimum value of R PU is determined by following factors:
① Meets the condition that V OLMAX =0.4V, I OLMAX =3mA when the output is Low.
Datasheet
V CC -V OL
R PU
≦ I OL
∴
R PU ≧
V CC -V OL
I OL
② V OLMAX =0.4V must be lower than the input Low level of the microcontroller and the EEPROM
including the recommended noise margin of 0.1V CC .
VOLMAX ≦ VIL-0.1 V CC
Examples: V CC =3V, VOL=0.4V, IOL=3mA, the VIL of the controller and
According to ①
エラー ! 編集中のフィールド コードからは、オブジェクトを作成できません。
the EEPROM is VIL=0.3V CC ,
and
VOL=0.4 ［ V ］
VIL=0.3 × 3
=0.9 ［ V ］
so that condition ② is met
○ SCL Pin Pull-up Resister
When SCL is controlled by the CMOS output the pull-up resistor at SCL is not required.
However, should SCL be set to Hi-Z, connection of a pull-up resistor between SCL and V CC is recommended.
Several k ? are recommended for the pull-up resistor in order to drive the output port of the microcontroller.
● Notes For Power Supply
V CC rises through the low voltage region in which the internal circuit of the IC and the controller are unstable. Therefore, the
device may not work properly due to an incomplete reset of the internal circuit. To prevent this, the device has a P.O.R. and
LV CC feature. At power up, maintain the following conditions to ensure functions of P.O.R and LV CC .
1. "SDA='H'" and "SCL='L' or 'H'".
2. Follow the recommended conditions of t R , t OFF , Vbot for the P.O.R. function during power up.
エラー ! 編集中のフィールド コードからは、オブジェクトを作成できません。
3. Prevent SDA and SCL from being "Hi-Z".
Recommended conditions of tR, tOFF, Vbot
In case conditions 1 and/or 2 cannot be met, take following
actions:
A)If unable to keep condition 1 ( SDA is "Low" during power
up):
tR
Below 10ms
Below 100ms
tOFF
Above 10ms
Above 10ms
Vbot
Below 0.3V
Below 0.2V
→ Control SDA ,SCL to be "High" as shown in figure below.
! 編集 17.
エラー Figure 中のフィールド コードからは、オブジェクトを作成できません。
B)If unable to keep condition 2.
→ After power becomes stable, execute software reset. (See Figure 13.)
C)If unable to keep both conditions 1 and 2.
→ Follow the instruction A first, then the instruction B.
● LV CC Circuit
LV CC circuit inhibits write operation at low voltage, and prevents an inadvertent write. Write operation is inhibited below the
LV CC voltage (Typ.=1.2V).
● Vcc NOISE Figure 18.
○ Bypass Condenser
Figure 19.
Noise and surges on power line may cause abnormal function. It is recommended that the bypass condensers (0.1μF) are
attached on the Vcc and GND line beside the device. It is also recommended to attach bypass condensers on the board
close to the connector.
● Notes for Use
1) Described numeric values and data are design representative values, and the values are not guaranteed.
2) We believe that application circuit examples are recommendable, however, in actual use, confirm characteristics further
sufficiently. In the case of use by changing the fixed number of external parts, make your decision with sufficient margin in
consideration of static characteristics and transition characteristics and fluctuations of external parts and our LSI.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
10/18
TSZ02201-0R2R0G100270-1-2
10.Jul.2012 Rev.001
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