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NXP Semiconductors
PCA9685
16-channel, 12-bit PWM Fm+ I 2 C-bus LED controller
? PCA9564 (0000 000) or PCA9665 (1110 000) slave address which is active on
start-up
? ‘reserved for future use’ I 2 C-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)
slave address
1
A5
A4
A3
A2
A1
A0 R/W
Fig 4.
Slave address
fixed
hardware selectable
002aad168
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 I 2 C-bus address
? Default power-up value (ALLCALLADR register): E0h or 1110 000X
? Programmable through I 2 C-bus (volatile programming)
? At power-up, LED All Call I 2 C-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 I 2 C-bus address      ” for more detail.
Remark: The default LED All Call I 2 C-bus address (E0h or 1110 000X) must not be used
as a regular I 2 C-bus slave address since this address is enabled at power-up. All the
PCA9685s on the I 2 C-bus will acknowledge the address if sent by the I 2 C-bus master.
7.1.3 LED Sub Call I 2 C-bus addresses
? 3 different I 2 C-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 I 2 C-bus (volatile programming)
? At power-up, Sub Call I 2 C-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, I 2 C-bus subaddress 1 to 3 ” for more detail.
Remark: The default LED Sub Call I 2 C-bus addresses may be used as regular I 2 C-bus
slave addresses as long as they are disabled.
PCA9685
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 2 September 2010
? NXP B.V. 2010. All rights reserved.
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