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PCA9551BS Datasheet(PDF) 4 Page - NXP Semiconductors |
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PCA9551BS Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 26 page PCA9551_8 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 08 — 31 July 2008 4 of 26 NXP Semiconductors PCA9551 8-bit I2C-bus LED driver with programmable blink rates [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 PCA9551”. 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 PCA9551 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. 6.2 Control register Following the successful acknowledgement of the slave address, the bus master will send a byte to the PCA9551, which will be stored in the Control register. The lowest 3 bits are used as a pointer to determine which register will be accessed. 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. PCA9551 slave address 002aac505 1 1 0 0 A2 A1 A0 R/W fixed slave address hardware selectable Reset state: 00h Fig 6. Control register 002aac506 0 0 0 AI 0 B2 B1 B0 register address Auto-Increment flag |
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