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NXP Semiconductors
Table 2.
PCA9685
16-channel, 12-bit PWM Fm+ I 2 C-bus LED controller
Pin description …continued
Symbol
Pin
TSSOP28
HVQFN28
Type
Description
LED12
LED13
LED14
LED15
OE
A5
EXTCLK
SCL
SDA
V DD
19
20
21
22
23
24
25
26
27
28
16
17
18
19
20
21
22
23
24
25
O
O
O
O
I
I
I
I
I/O
power supply
LED driver 12
LED driver 13
LED driver 14
LED driver 15
active LOW output enable
address input 5
external clock input [2]
serial clock line
serial data line
supply voltage
[1]
[2]
HVQFN28 package die supply ground is connected to both V SS pin and exposed center pad. V SS pin 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.
This pin must be grounded when this feature is not used.
7. Functional description
Refer to Figure 1 “ Block    diagram of PCA9685 ” .
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 64 possible programmable addresses using the 6 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 62 addresses. Using
other reserved addresses, as well as any other subcall 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 PCA9685 is shown in Figure 4 . 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 PCA9685 treats them like any other address. The
LED All Call, Software Reset and PCA9564 or PCA9665 slave address (if on the bus) can
never be used for individual device addresses.
? PCA9685 LED All Call address (1110 000) and Software Reset (0000 0110) which are
active on start-up
PCA9685
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 2 September 2010
? NXP B.V. 2010. All rights reserved.
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