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NXP Semiconductors
PCA9634
8-bit Fm+ I 2 C-bus LED driver
7. Functional description
Refer to Figure 1 “Block diagram of PCA9634” .
7.1 Device addresses
Following a START condition, the bus master must output the address of the slave it is
accessing.
There are a maximum of 128 possible programmable addresses using the 7 hardware
address pins. Two of these addresses, Software Reset and LED All Call, cannot be used
because their default power-up state is ON, leaving a maximum of 126 addresses. Using
other reserved addresses, as well as any other Sub Call address, will reduce the total
number of possible addresses even further.
7.1.1 Regular I 2 C-bus slave address
The I 2 C-bus slave address of the PCA9634 is shown in Figure 5 . To conserve power, no
internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW.
Remark: Using reserved I 2 C-bus addresses will interfere with other devices, but only if the
devices are on the bus and/or the bus will be open to other I 2 C-bus systems at some later
date. In a closed system where the designer controls the address assignment these
addresses can be used since the PCA9634 treats them like any other address. The
LED All Call, Software Rest and PCA9564 or PCA9665 slave address (if on the bus) can
never be used for individual device addresses.
? PCA9634 LED All Call address (1110 000) and Software Reset (0000 0110) which
are active on start-up
? 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)
High-speed mode (Hs-mode) master code (0000 1XX).
slave address
A6
A5
A4
A3
A2
A1
A0 R/W
hardware selectable
002aab319
Fig 5.
Slave address
The last bit of the address byte de?nes the operation to be performed. When set to logic 1
a read is selected, while a logic 0 selects a write operation.
PCA9634_6
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 12 September 2008
7 of 38
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