Electronic Components Datasheet Search |
|
PCA9546ADG4 Datasheet(PDF) 4 Page - Texas Instruments |
|
PCA9546ADG4 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 27 page www.ti.com Device Address 1 1 1 0 A1 A2 A0 Slave Address R/W Fixed Hardware Selectable Control Register Channel Selection Bits (Read/Write) Channel 0 Channel 1 Channel 2 Channel 3 B3 B2 B1 B0 3 2 1 0 X X X X 4 5 6 7 Control Register Definition PCA9546A 4-CHANNEL I2C AND SMBus SWITCH WITH RESET FUNCTION SCPS148E – OCTOBER 2005 – REVISED JANUARY 2008 Following a start condition, the bus master must output the address of the slave it is accessing. The address of the PCA9546A is shown in Figure 1. To conserve power, no internal pullup resistors are incorporated on the hardware-selectable address pins, and they must be pulled high or low. Figure 1. PCA9546A Address The last bit of the slave address defines the operation to be performed. When set to a logic 1, a read is selected, while a logic 0 selects a write operation. Following the successful acknowledgment of the slave address, the bus master sends a byte to the PCA9546A, which is stored in the control register (see Figure 2). If multiple bytes are received by the PCA9546A, it will save the last byte received. This register can be written and read via the I2C bus. Figure 2. Control Register One or several SCn/SDn downstream pairs, or channels, are selected by the contents of the control register (see Table 1). This register is written after the PCA9546A has been addressed. The four LSBs of the control byte are used to determine which channel or channels are to be selected. When a channel is selected, the channel becomes active after a stop condition has been placed on the I2C bus. This ensures that all SCn/SDn lines are in a high state when the channel is made active, so that no false conditions are generated at the time of connection. A stop condition always must occur right after the acknowledge cycle. 4 Submit Documentation Feedback Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): PCA9546A |
Similar Part No. - PCA9546ADG4 |
|
Similar Description - PCA9546ADG4 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |