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PCA9531D Datasheet(PDF) 5 Page - NXP Semiconductors |
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PCA9531D Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 27 page PCA9531_6 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 06 — 19 February 2009 5 of 27 NXP Semiconductors PCA9531 8-bit I2C-bus LED dimmer [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 PCA9531”. 6.1 Device address Following a START condition, the bus master must output the address of the slave it is accessing. The address of the PCA9531 is shown in Figure 5. To conserve power, no internal pull-up resistors are incorporated on the hardware selectable address pins and they must be pulled HIGH or LOW. The last bit of the address byte defines the operation to be performed. When set to logic 1 a read is selected, while a logic 0 selects a write operation. VSS 86[1] supply ground LED4 9 7 LED driver 4 LED5 10 8 LED driver 5 LED6 11 9 LED driver 6 LED7 12 10 LED driver 7 RESET 13 11 reset input (active LOW) SCL 14 12 serial clock line SDA 15 13 serial data line VDD 16 14 supply voltage Table 2. Pin description …continued Symbol Pin Description SO16, TSSOP16 HVQFN16 Fig 5. PCA9531 slave address 002aac505 1 1 0 0 A2 A1 A0 R/W fixed slave address hardware selectable |
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