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NXP Semiconductors
PCA9635
16-bit Fm+ I 2 C-bus LED driver
7.3.7 SUBADR1 to SUBADR3, I 2 C-bus subaddress 1 to 3
Table 11.
SUBADR1 to SUBADR3 - I 2 C-bus subaddress registers 1 to 3 (address 18h to
1Ah) bit description
Legend: * default value.
Address
Register
Bit
Symbol
Access Value
Description
18h
19h
1Ah
SUBADR1
SUBADR2
SUBADR3
7:1
0
7:1
0
7:1
0
A1[7:1]
A1[0]
A2[7:1]
A2[0]
A3[7:1]
A3[0]
R/W
R only
R/W
R only
R/W
R only
1110 001*
0*
1110 010*
0*
1110 100*
0*
I 2 C-bus subaddress 1
reserved
I 2 C-bus subaddress 2
reserved
I 2 C-bus subaddress 3
reserved
Subaddresses are programmable through the I 2 C-bus. Default power-up values are E2h,
E4h, E8h, and the device(s) will not acknowledge these addresses right after power-up
(the corresponding SUBx bit in MODE1 register is equal to 0).
Once subaddresses have been programmed to their right values, SUBx bits need to be
set to logic 1 in order to have the device acknowledging these addresses (MODE1
register).
Only the 7 MSBs representing the I 2 C-bus subaddress are valid. The LSB in SUBADRx
register is a read-only bit (0).
When SUBx is set to logic 1, the corresponding I 2 C-bus subaddress can be used during
either an I 2 C-bus read or write sequence.
7.3.8 ALLCALLADR, LED All Call I 2 C-bus address
Table 12.
ALLCALLADR - LED All Call I 2 C-bus address register (address 1Bh) bit
description
Legend: * default value.
Address
Register
Bit
Symbol
Access Value
Description
1Bh
ALLCALLADR
7:1
AC[7:1]
R/W
1110 000*
ALLCALL I 2 C-bus
address register
0
AC[0]
R only
0*
reserved
The LED All Call I 2 C-bus address allows all the PCA9635s in the bus to be programmed
at the same time (ALLCALL bit in register MODE1 must be equal to 1 (power-up default
state)). This address is programmable through the I 2 C-bus and can be used during either
an I 2 C-bus read or write sequence. The register address can also be programmed as a
Sub Call.
Only the 7 MSBs representing the All Call I 2 C-bus address are valid. The LSB in
ALLCALLADR register is a read-only bit (0).
If ALLCALL bit = 0, the device does not acknowledge the address programmed in register
ALLCALLADR.
PCA9635_7
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 07 — 16 July 2009
14 of 35
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