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NXP Semiconductors
Table 2.
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
Pin description …continued
Symbol
LED13
LED14
LED15
RESET
USCL
USDA
Pin
21
22
23
25
26
27
Type
O
O
O
I
I
I
Description
LED driver 13
LED driver 14
LED driver 15
active LOW reset input
UFm serial clock line
UFm serial data line
V SS
V DD
10, 19,
28
24 [2]
ground
power supply
supply ground
supply voltage
[1]
[2]
In order to obtain the best system level ESD performance, a standard pull-up resistor (10 k ? typical) is
required for any address pin connecting to V DD . For additional information on system level ESD
performance, please refer to application notes AN10897 and AN11131.
HTSSOP28 package supply ground is connected to both V SS pins and exposed center pad. V SS pins must
be connected to supply ground for proper device operation. For enhanced thermal, electrical, and board
level performance, the exposed pad needs to be soldered to the board using a corresponding thermal pad
on the board and for proper heat conduction through the board, thermal vias need to be incorporated in the
PCB in the thermal pad region.
7. Functional description
Refer to Figure 1 “ Block diagram of PCU9955 ” .
7.1 Device addresses
Following a START condition, the bus master must output the address of the slave it is
accessing.
For PCU9955 there are a maximum of 16 possible programmable addresses using the
4 hardware address pins.
7.1.1 Regular I 2 C-bus slave address
The I 2 C-bus slave address of the PCU9955 is shown in Figure 3 . To conserve power, no
internal pull-up resistors are incorporated on the hardware selectable address pins and
they must be pulled HIGH or LOW externally.
Remark: Reserved I 2 C-bus addresses must be used with caution since they can interfere
with:
?
?
?
?
‘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)
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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