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PCA9632TK2 Datasheet(PDF) 9 Page - NXP Semiconductors |
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PCA9632TK2 Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 38 page  PCA9632_3 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 03 — 15 July 2008 9 of 38 NXP Semiconductors PCA9632 4-bit Fm+ I2C-bus low power LED driver Remark: Other combinations not shown in Table 4 (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 four LED drivers must be individually programmed with different values during the same I2C-bus communication, for example, changing color setting to another color setting. AI[2:0] = 110 is used when the LED drivers must be globally programmed with different settings during the same I2C-bus communication, for example, global brightness or blinking change. AI[2:0] = 111 is used when individual and global changes must be performed during the same I2C-bus communication, for example, changing a color and global brightness at the same time. Only the 4 least significant bits D[3:0] are affected by the AI[2:0] bits. When the Control register is written, the register entry point determined by D[3:0] is the first register that will be addressed (read or write operation), and can be anywhere between 0000 and 1100 (as defined in Table 5). When AI[2] = 1, the Auto-Increment flag is set and the rollover value at which the point where the register increment stops and goes to the next one is determined by AI[2:0]. See Table 4 for rollover values. For example, if the Control register = 1110 1000 (E8h), then the register addressing sequence will be (in hex): 08 → … → 0C → 00 → … → 07 → 02 → … → 07 → 02 → … → 07 → 02 → … as long as the master keeps sending or reading data. Table 4. Auto-Increment options AI2 AI1 AI0 Function 0 0 0 no Auto-Increment 1 0 0 Auto-Increment for all registers. D3, D2, D1, D0 roll over to ‘0000’ after the last register (1100) is accessed. 1 0 1 Auto-Increment for Individual brightness registers only. D3, D2, D1, D0 roll over to ‘0010’ after the last register (0101) is accessed. 1 1 0 Auto-Increment for global control registers only. D3, D2, D1, D0 roll over to ‘0110’ after the last register (0111) is accessed. 1 1 1 Auto-Increment for individual and global control registers only. D3, D2, D1, D0 roll over to ‘0010’ after the last register (0111) is accessed. |
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