PCA9685 datasheet(8/51 Pages) NXP

8 / 51 page

PCA9685

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Product data sheet

Rev. 3 — 2 September 2010

8 of 51

NXP Semiconductors

PCA9685

16-channel, 12-bit PWM Fm+ I2C-bus LED controller

7.1.4 Software Reset I2C-bus address

The address shown in Figure 5 is used when a reset of the PCA9685 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 PCA9685 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 PCA9685, which will be

stored in the Control register.

This register is used as a pointer to determine which register will be accessed.

Fig 5.

Software Reset address

002aab416

R/W

reset state = 00h

Remark: The Control register does not apply to the Software Reset I2C-bus address.

Fig 6.

Control register

002aac826

PCA9685 Datasheet(PDF) 8 Page - NXP Semiconductors