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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
7.3.9 LED bit Sub Call I 2 C-bus addresses for PCU9955
Table 13.
SUBADR1 to SUBADR3 - I 2 C-bus subaddress registers 1 to 3 (address 3Bh to
3Dh) bit description
Legend: * default value.
Address
Register
Bit
Symbol
Access Value
Description
3Bh
3Ch
3Dh
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]
W only
W only
W only
W only
W only
W only
1110 110*
0*
1110 110*
0*
1110 110*
0*
I 2 C-bus subaddress 1
reserved
I 2 C-bus subaddress 2
reserved
I 2 C-bus subaddress 3
reserved
Default power-up values are ECh, ECh, ECh. At power-up, SUBADR1 is enabled while
SUBADR2 and SUBADR3 are disabled. The power-up default bit subaddress of ECh
indicates that this device is a 16-channel LED driver.
All three subaddresses are programmable. Once subaddresses have been programmed
to their right values, SUBx bits need to be set to logic 1 in order to have the device
respond to these addresses (MODE1 register) (0). When SUBx is set to logic 1, the
corresponding I 2 C-bus subaddress can be used during an UFm I 2 C-bus write sequence.
7.3.10 ALLCALLADR, LED All Call I 2 C-bus address
Table 14.
ALLCALLADR - LED All Call I 2 C-bus address register (address 3Eh) bit
description
Legend: * default value.
Address
Register
Bit
Symbol
Access Value
Description
3Eh
ALLCALLADR
7:1
AC[7:1]
W only
1110 000*
ALLCALL I 2 C-bus
address register
0
AC[0]
W only
0*
reserved
The LED All Call I 2 C-bus address allows all the PCU9955s on the bus to be programmed
at the same time (ALLCALL bit in register MODE1 must be equal to logic 1 (power-up
default state)). This address is programmable through the I 2 C-bus and can be used during
an I 2 C-bus 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 the
ALLCALLADR register is a 0.
7.3.11 RESERVED1
This register is reserved.
PCU9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 2 October 2012
? NXP B.V. 2012. All rights reserved.
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