Electronic Components Datasheet Search |
|
PCA9674A Datasheet(PDF) 6 Page - NXP Semiconductors |
|
PCA9674A Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 34 page PCA9674_PCA9674A_2 © NXP B.V. 2006. All rights reserved. Product data sheet Rev. 02 — 12 October 2006 6 of 34 NXP Semiconductors PCA9674/74A Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt [1] HVQFN package die supply ground is connected to both the VSS pin and the exposed center pad. The VSS pin must be connected to supply ground for proper device operation. For enhanced thermal, electrical, and board-level performance, the exposed pad needs to be soldered to the board using a corresponding thermal pad on the board, and for proper heat conduction through the board thermal vias need to be incorporated in the PCB in the thermal pad region. 7. Functional description Refer to Figure 1 “Block diagram of PCA9674/74A”. 7.1 Device address Following a START condition, the bus master must send the address of the slave it is accessing and the operation it wants to perform (read or write). The address of the PCA9674/74A is shown in Figure 8. Slave address pins AD2, AD1, and AD0 choose 1 of 64 slave addresses. To conserve power, no internal pull-up resistors are incorporated on AD2, AD1, and AD0. Address values depending on AD2, AD1, and AD0 can be found in Table 5 “PCA9674 address map” and Table 6 “PCA9674A address map”. Remark: When using the PCA9674A, the General Call address (0000 0000b) and the Device ID address (1111 100Xb) are reserved and cannot be used as device address. Failure to follow this requirement will cause the PCA9674A not to acknowledge. Remark: When using the PCA9674 or the PCA9674A, reserved I2C-bus addresses must be used with caution since they can interfere with: • “reserved for future use” I2C-bus addresses (0000 011, 1111 101, 1111 110, 1111 111) • slave devices that use the 10-bit addressing scheme (1111 0xx) • High speed mode (Hs-mode) master code (0000 1xx) Table 4. Pin description for HVQFN16 Symbol Pin Description AD2 1 address input 2 P0 2 quasi-bidirectional I/O 0 P1 3 quasi-bidirectional I/O 1 P2 4 quasi-bidirectional I/O 2 P3 5 quasi-bidirectional I/O 3 VSS[1] 6 supply ground P4 7 quasi-bidirectional I/O 4 P5 8 quasi-bidirectional I/O 5 P6 9 quasi-bidirectional I/O 6 P7 10 quasi-bidirectional I/O 7 INT 11 interrupt output (active LOW) SCL 12 serial clock line SDA 13 serial data line VDD 14 supply voltage AD0 15 address input 0 AD1 16 address input 1 |
Similar Part No. - PCA9674A |
|
Similar Description - PCA9674A |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |