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PCA9553TK Datasheet(PDF) 5 Page - NXP Semiconductors |
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PCA9553TK Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 26 page PCA9553_6 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 06 — 29 December 2008 5 of 26 NXP Semiconductors PCA9553 4-bit I2C-bus LED driver with programmable blink rates 7. Functional description Refer to Figure 1 “Block diagram”. 7.1 Device address Following a START condition the bus master must output the address of the slave it is accessing. The address of the PCA9553/01 is shown in Figure 5 and PCA9553/02 in Figure 6. PCA9553TK uses the version /01 address. 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. 7.2 Control register Following the successful acknowledgement of the slave address, the bus master will send a byte to the PCA9553 which will be stored in the Control register. The lowest 3 bits are used as a pointer to determine which register will be accessed. If the Auto-Increment flag is set, the three low order bits of the Control register are automatically incremented after a read or write. This allows the user to program the registers sequentially. The contents of these bits will rollover to ‘000’ after the last register is accessed. When the Auto-Increment flag is set (AI = 1) and a read sequence is initiated, the sequence must start by reading a register different from ‘0’ (B2 B1 B0 ≠ 0 0 0). Only the 3 least significant bits are affected by the AI flag. Unused bits must be programmed with zeroes. Fig 5. PCA9553/01 slave address Fig 6. PCA9553/02 slave address R/W 002aad742 1 1 0 0 0 1 0 slave address R/W 002aad743 1 1 0 0 0 1 1 slave address Reset state: 00h Fig 7. Control register B0 002aad744 0 0 0 AI 0 B2 B1 register address Auto-Increment flag |
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