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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCA9541AD/01 датащи(PDF) 25 Page - NXP Semiconductors |
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PCA9541AD/01 датащи(HTML) 25 Page - NXP Semiconductors |
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25 / 41 page  PCA9541A_3 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 03 — 16 July 2009 25 of 41 NXP Semiconductors PCA9541A 2-to-1 I2C-bus master selector with interrupt logic and reset 10.2 High reliability systems In a typical multipoint application, shown in Figure 18, the two masters (for example, primary and back-up) are located on separate I2C-buses that connect to multiple downstream I2C-bus slave cards/devices via a PCA9541A/01 for non-hot swap applications to provide high reliability of the I2C-bus. I2C-bus commands are sent via the primary or back-up master and either master can take command of the I2C-bus. Either master at any time can gain control of the slave devices if the other master is disabled or removed from the system. The failed master is isolated from the system and will not affect communication between the on-line master and the slave devices located on the cards. For even higher reliability in multipoint backplane applications, two dedicated masters can be used for every card as shown in Figure 19. Fig 18. High reliability backplane application Fig 19. Very high reliability backplane application 002aae662 SCL1 SDA1 SCL0 SDA0 002aae663 SCL1 SDA1 SCL0 SDA0 SCL0 SDA0 SCL0 SDA0 SCL0 SDA0 SCL1 SDA1 SCL1 SDA1 SCL1 SDA1 |
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