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PCA9545AD Datasheet(PDF) 7 Page - NXP Semiconductors |
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PCA9545AD Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 28 page PCA9545A_45B_45C_7 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 07 — 19 June 2009 7 of 28 NXP Semiconductors PCA9545A/45B/45C 4-channel I2C-bus switch with interrupt logic and reset 6.2 Control register Following the successful acknowledgement of the slave address, the bus master will send a byte to the PCA9545A/45B/45C, which will be stored in the control register. If multiple bytes are received by the PCA9545A/45B/45C, it will save the last byte received. This register can be written and read via the I2C-bus. 6.2.1 Control register definition One or several SCx/SDx downstream pair, or channel, is selected by the contents of the control register. This register is written after the PCA9545A/45B/45C has been addressed. The 4 LSBs of the control byte are used to determine which channel is to be selected. When a channel is selected, the channel will become active after a STOP condition has been placed on the I2C-bus. This ensures that all SCx/SDx lines will be in a HIGH state when the channel is made active, so that no false conditions are generated at the time of connection. Remark: Several channels can be enabled at the same time. Example: B3 = 0, B2 = 1, B1 = 1, B0 = 0, means that channel 0 and channel 3 are disabled and channel 1 and channel 2 are enabled. Care should be taken not to exceed the maximum bus capacity. Fig 8. Control register 002aab170 INT 3 INT 2 INT 1 INT 0 B3 B2 B1 B0 channel selection bits (read/write) 76543210 interrupt bits (read only) channel 0 channel 1 channel 2 channel 3 INT0 INT1 INT2 INT3 Table 4. Control register: write (channel selection); read (channel status) INT3 INT2 INT1 INT0 B3 B2 B1 B0 Command XXXXXXX 0 channel 0 disabled 1 channel 0 enabled XXXXXX 0 X channel 1 disabled 1 channel 1 enabled XXXXX 0 XX channel 2 disabled 1 channel 2 enabled XXXX 0 XXX channel 3 disabled 1 channel 3 enabled 00000000no channel selected; power-up/reset default state |
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