PCA9952Q900 Datasheet, PDF (18/45 Pages) NXP Semiconductors – 16-channel Fm+ I2C-bus 57 mA constant current LED driver AEC-Q100 compliant

NXP Semiconductors
PCA9952/Q900; PCA9955/Q900
16-channel Fm+ I²C-bus 57 mA constant current LED driver, AEC-Q100
7.3.9 LED bit Sub Call I²C-bus addresses for PCA9952/Q900, PCA9955/Q900
Table 15. SUBADR1 to SUBADR3 - I²C-bus subaddress registers 1 to 3 (address 3Bh to
3Dh) bit description
Legend: * default value.
Address Register
Bit Symbol Access Value
Description
3Bh
SUBADR1 7:1 A1[7:1]
R/W
1110 110* I²C-bus subaddress 1
0
A1[0]
R only 0*
reserved
3Ch
SUBADR2 7:1 A2[7:1]
R/W
1110 110* I²C-bus subaddress 2
0
A2[0]
R only 0*
reserved
3Dh
SUBADR3 7:1 A3[7:1]
R/W
1110 110* I²C-bus subaddress 3
0
A3[0]
R only 0*
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
acknowledging these addresses (MODE1 register) (0). When SUBx is set to logic 1, the
corresponding I²C-bus subaddress can be used during either an I²C-bus read or write
sequence.
7.3.10 ALLCALLADR, LED All Call I²C-bus address
Table 16. ALLCALLADR - LED All Call I²C-bus address register (address 3Eh) bit
description
Legend: * default value.
Address Register
Bit Symbol Access Value
Description
3Eh
ALLCALLADR 7:1 AC[7:1] R/W 1110 000* ALLCALL I²C-bus
address register
0
AC[0] R only 0*
reserved
The LED All Call I²C-bus address allows all the PCA9952/Q900, PCA9955/Q900s 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 I²C-bus
and can be used during either an I²C-bus read or write sequence. The register address
can also be programmed as a Sub Call.
Only the 7 MSBs representing the All Call I²C-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.
7.3.11 RESERVED1
This register is reserved.
7.3.12 RESERVED2, RESERVED3
These registers are reserved.
PCA9952Q900_PCA9955Q900
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 26 April 2013
© NXP B.V. 2013. All rights reserved.
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