参数资料
| 型号： | BR24C21FV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 9/21页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM EDID 1K 100KHZ 8-SSOP |
| 标准包装： | 1 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 1K (128 x 8) |
| 速度： | 400kHz |
| 接口： | I²C，2 线串口 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-LSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-SSOPB |
| 包装： | 标准包装 |
| 其它名称： | BR24C21FV-E2DKR |
BR24C21xxx Series (1K)
Datasheet
● Command Cancellation By Start And Stop Condition
During a command input, command is canceled by the successive inputs of start condition and stop condition (Figure 15.).
However, during ACK or data output, the device may output the SDA line Low. In such cases, operation of start and stop
condition is impossible, making the reset inoperable. Execute the software reset in the cases. (Figure 13.)
Operating the command cancel by start and stop condition during the command of Random Read or Sequential Read or
Current Read, internal address counter is not confirmed. Therefore operation of Current Read after this is not valid. Operate
a Random Read in this case.
SCL
SDA
1
0
1
0
Start
Condition
Stop
Condition
Figure 15. Command Cancellation
● I/O Circuit
○ SDA Pin Pull-up Resister
The pull up resister is needed because SDA is NMOS open drain. Choose the correct value of this resister(R PU ), by
considering VIL, IL characteristics of a controller which control the device and VOH, IOL characteristics of the device. If
large R PU is chosen, clock frequency needs to be slow. In case of small R PU , the operating current increases.
○ Maximum Rpu
Maximum value of R PU is determined by following factors:
① SDA rise time determined by R PU and the capacitance of bus line(CBUS) must be less than tR.
1) Other timing must keep the conditions of AC spec.
② When SDA bus is High, the voltage A of SDA bus determined by a total input leak(IL) of the all devices connected to
the bus. R PU must be significantly higher than the High level input of a controller and the device, including a noise
margin 0.2V CC .
V CC -ILR PU -0.2 V CC ≧ VIH
MICRO
∴
R PU
≦
0.8Vcc-V IH
IL
COMPUTER
R PU
A
SDA PIN
Examples: When V CC =3V IL=10μA VIH=0.7V CC
According to ②
IL
IL
R PU
≦
0.8x3-0.7x3
10x10 -6
≦
300 [k ? ]
THE CAPACITANCE OF
BUS LINE (CBUS)
Figure 16. I/O Circuits
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
9/18
TSZ02201-0R2R0G100270-1-2
10.Jul.2012 Rev.001
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