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BR24C21F-E2 Datasheet(PDF) 9 Page - Rohm |
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BR24C21F-E2 Datasheet(HTML) 9 Page - Rohm |
9 / 21 page Datasheet Datasheet 9/18 TSZ02201-0R2R0G100270-1-2 © 2012 ROHM Co., Ltd. All rights reserved. 10.Jul.2012 Rev.001 www.rohm.com TSZ22111・15・001 BR24C21xxx Series (1K) ●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. 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(RPU), by considering VIL, IL characteristics of a controller which control the device and VOH, IOL characteristics of the device. If large RPU is chosen, clock frequency needs to be slow. In case of small RPU, the operating current increases. ○Maximum Rpu Maximum value of RPU is determined by following factors: ①SDA rise time determined by RPU and the capacitance of bus line(CBUS) must be less than tR. 1) Other timing must keep the conditions of AC spec. ②When 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. RPU must be significantly higher than the High level input of a controller and the device, including a noise margin 0.2VCC. VCC-ILRPU-0.2 VCC ≧ VIH 0.8Vcc-VIH ∴ RPU ≦ IL Examples: When VCC=3V IL=10µA VIH=0.7VCC According to ② 0.8x3-0.7x3 RPU ≦ 10x10 -6 ≦ 300 [k Ω] THE CAPACITANCE OF BUS LINE (CBUS) SDA PIN RPU A IL IL MICRO COMPUTER Figure 16. I/O Circuits SCL SDA 1 1 0 0 Start Condition Stop Condition |
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