PCA9685 datasheet(7/50 Pages) NXP

7 / 50 page

PCA9685_2

Product data sheet

Rev. 02 — 16 July 2009

7 of 50

NXP Semiconductors

PCA9685

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

• PCA9564 (0000 000) or PCA9665 (1110 000) slave address which is active on

start-up

• ‘reserved for future use’ I2C-bus addresses (0000 011, 1111 1XX)

• slave devices that use the 10-bit addressing scheme (1111 0XX)

• slave devices that are designed to respond to the General Call address (0000 000)

which is used as the software reset address

• High-speed mode (Hs-mode) master code (0000 1XX)

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.

7.1.2 LED All Call I2C-bus address

• Default power-up value (ALLCALLADR register): E0h or 1110 000X

• Programmable through I2C-bus (volatile programming)

• At power-up, LED All Call I2C-bus address is enabled. PCA9685 sends an ACK when

E0h (R/W = 0) or E1h (R/W = 1) is sent by the master.

See Section 7.3.7 “ALLCALLADR, LED All Call I2C-bus address” for more detail.

Remark: The default LED All Call I2C-bus address (E0h or 1110 000X) must not be used

as a regular I2C-bus slave address since this address is enabled at power-up. All the

PCA9685s on the I2C-bus will acknowledge the address if sent by the I2C-bus master.

7.1.3 LED Sub Call I2C-bus addresses

• 3 different I2C-bus addresses can be used

• Default power-up values:

– SUBADR1 register: E2h or 1110 001X

– SUBADR2 register: E4h or 1110 010X

– SUBADR3 register: E8h or 1110 100X

• Programmable through I2C-bus (volatile programming)

• At power-up, Sub Call I2C-bus addresses are disabled. PCA9685 does not send an

ACK when E2h (R/W = 0) or E3h (R/W = 1), E4h (R/W = 0) or E5h (R/W = 1), or

E8h (R/W = 0) or E9h (R/W = 1) is sent by the master.

See Section 7.3.6 “SUBADR1 to SUBADR3, I2C-bus subaddress 1 to 3” for more detail.

Remark: The default LED Sub Call I2C-bus addresses may be used as regular I2C-bus

slave addresses as long as they are disabled.

Fig 4.

Slave address

R/W

002aad168

hardware selectable

slave address

fixed

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