PCA9635 Datasheet, PDF (6/35 Pages) NXP Semiconductors – 16-bit Fm+ I2C-bus LED driver

NXP Semiconductors
PCA9635
16-bit Fm+ I²C-bus LED driver
slave address
A6 A5 A4 A3 A2 A1 A0 R/W
hardware selectable
002aab319
Fig 3. Slave address
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. PCA9635 sends an ACK when
E0h (R/W = 0) or E1h (R/W = 1) is sent by the master.
See Section 7.3.8 “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
PCA9635s 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. PCA9635 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 7.3.7 “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.
PCA9635_6
Product data sheet
Rev. 06 — 11 September 2008
© NXP B.V. 2008. All rights reserved.
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