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PCA9554D,112 Datasheet(PDF) 6 Page - NXP Semiconductors |
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PCA9554D,112 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 35 page PCA9554_9554A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 9 — 19 March 2013 6 of 35 NXP Semiconductors PCA9554; PCA9554A 8-bit I2C-bus and SMBus I/O port with interrupt 5.2 Pin description [1] HVQFN16 package die supply ground is connected to both VSS pin and exposed center pad. 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. 6. Functional description Refer to Figure 1 “Block diagram of PCA9554/PCA9554A”. 6.1 Registers 6.1.1 Command byte The command byte is the first byte to follow the address byte during a write transmission. It is used as a pointer to determine which of the following registers will be written or read. Table 3. Pin description Symbol Pin Description SO16, SSOP16, TSSOP16 HVQFN16 SSOP20 A0 1 15 6 address input 0 A1 2 16 7 address input 1 A2 3 1 9 address input 2 IO0 4 2 10 input/output 0 IO1 5 3 11 input/output 1 IO2 6 4 12 input/output 2 IO3 7 5 14 input/output 3 VSS 86[1] 15 supply ground IO4 9 7 16 input/output 4 IO5 10 8 17 input/output 5 IO6 11 9 19 input/output 6 IO7 12 10 20 input/output 7 INT 13 11 1 interrupt output (open-drain) SCL 14 12 2 serial clock line SDA 15 13 4 serial data line VDD 16 14 5 supply voltage n.c. - - 3, 8, 13, 18 not connected Table 4. Command byte Command Protocol Function 0 read byte Input Port register 1 read/write byte Output Port register 2 read/write byte Polarity Inversion register 3 read/write byte Configuration register |
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