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PCA9622BS Datasheet(PDF) 9 Page - NXP Semiconductors |
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PCA9622BS Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 39 page  PCA9622_3 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 03 — 31 August 2009 9 of 39 NXP Semiconductors PCA9622 16-bit Fm+ I2C-bus 100 mA 40 V LED driver 7.2 Control register Following the successful acknowledgement of the slave address, LED All Call address or LED Sub Call address, the bus master will send a byte to the PCA9622, which will be stored in the Control register. The lowest 5 bits are used as a pointer to determine which register will be accessed (D[4:0]). The highest 3 bits are used as Auto-Increment flag and Auto-Increment options (AI[2:0]). When the Auto-Increment flag is set (AI2 = logic 1), the five low order bits of the Control register are automatically incremented after a read or write. This allows the user to program the registers sequentially. Four different types of Auto-Increment are possible, depending on AI1 and AI0 values. Remark: Other combinations not shown in Table 3 (AI[2:0] = 001, 010, and 011) are reserved and must not be used for proper device operation. AI[2:0] = 000 is used when the same register must be accessed several times during a single I2C-bus communication, for example, changes the brightness of a single LED. Data is overwritten each time the register is accessed during a write operation. AI[2:0] = 100 is used when all the registers must be sequentially accessed, for example, power-up programming. AI[2:0] = 101 is used when the 16 LED drivers must be individually programmed with different values during the same I2C-bus communication, for example, changing color setting to another color setting. reset state = 80h Remark: The Control register does not apply to the Software Reset I2C-bus address. Fig 6. Control register Table 3. Auto-Increment options AI2 AI1 AI0 Function 0 0 0 no Auto-Increment 1 0 0 Auto-Increment for all registers. D[4:0] roll over to ‘0 0000’ after the last register (1 1011) is accessed. 1 0 1 Auto-Increment for individual brightness registers only. D[4:0] roll over to ‘0 0010’ after the last register (1 0001) is accessed. 1 1 0 Auto-Increment for global control registers only. D[4:0] roll over to ‘1 0010’ after the last register (1 0011) is accessed. 1 1 1 Auto-Increment for individual and global control registers only. D[4:0] roll over to ‘0 0010’ after the last register (1 0011) is accessed. 002aac147 AI2 AI1 AI0 D4 D3 D2 D1 D0 Auto-Increment flag register address Auto-Increment options |
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