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PCA9635 Datasheet(PDF) 7 Page - NXP Semiconductors |
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PCA9635 Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 35 page  PCA9635_7 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 07 — 16 July 2009 7 of 35 NXP Semiconductors PCA9635 16-bit Fm+ I2C-bus LED driver 7.1.4 Software reset I2C-bus address The address shown in Figure 4 is used when a reset of the PCA9635 needs to be performed by the master. The Software Reset address (SWRST Call) must be used with R/W = logic 0. If R/W = logic 1, the PCA9635 does not acknowledge the SWRST. See Section 7.6 “Software reset” for more detail. Remark: The Software Reset I2C-bus address is a reserved address and cannot be used as a regular I2C-bus slave address or as an LED All Call or LED Sub Call address. 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 PCA9635, 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. Fig 4. Software Reset address 0 002aab416 0 0 0 0 0 1 1 R/W reset state = 80h Remark: The Control register does not apply to the Software Reset I2C-bus address. Fig 5. Control register 002aac147 AI2 AI1 AI0 D4 D3 D2 D1 D0 Auto-Increment flag register address Auto-Increment options |
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