PCA9625
16-bit Fm+ I
2
C-bus 100 mA 24 V LED driver
Rev. 02 — 15 January 2008
Product data sheet
1. General description
The PCA9625 is an I
2
C-bus controlled 16-bit LED driver optimized for voltage switch
dimming and blinking 100 mA Red/Green/Blue/Amber (RGBA) LEDs. Each LED output
has its own 8-bit resolution (256 steps) fixed frequency individual PWM controller that
operates at 97 kHz with a duty cycle that is adjustable from 0 % to 99.6 % to allow the
LED to be set to a specific brightness value. An additional 8-bit resolution (256 steps)
group PWM controller has both a fixed frequency of 190 Hz and an adjustable frequency
between 24 Hz to once every 10.73 seconds with a duty cycle that is adjustable from 0 %
to 99.6 % that is used to either dim or blink all LEDs with the same value.
Each LED output can be off, on (no PWM control), set at its individual PWM controller
value or at both individual and group PWM controller values. The PCA9625 operates with
a supply voltage range of 2.3 V to 5.5 V and the 100 mA open-drain outputs allow
voltages up to 24 V.
The PCA9625 is one of the first LED controller devices in a new Fast-mode Plus (Fm+)
family. Fm+ devices offer higher frequency (up to 1 MHz) and more densely populated bus
operation (up to 4000 pF).
The active LOW Output Enable input pin (OE) blinks all the LED outputs and can be used
to externally PWM the outputs, which is useful when multiple devices need to be dimmed
or blinked together without using software control.
Software programmable LED Group and three Sub Call I
2
C-bus addresses allow all or
defined groups of PCA9625 devices to respond to a common I
2
C-bus address, allowing
for example, all red LEDs to be turned on or off at the same time or marquee chasing
effect, thus minimizing I
2
C-bus commands. Seven hardware address pins allow up to
126 devices on the same bus.
The Software Reset (SWRST) Call allows the master to perform a reset of the PCA9625
through the I
2
C-bus, identical to the Power-On Reset (POR) that initializes the registers to
their default state causing the outputs to be set HIGH (LED off). This allows an easy and
quick way to reconfigure all device registers to the same condition.
The PCA9625 and PCA9635 software is identical and if the PCA9625 on-chip 100 mA
NAND FETs do not provide enough current or voltage to drive the LEDs, then the
PCA9635 with larger current or higher voltage external drivers can be used.
NXP Semiconductors
PCA9625
16-bit Fm+ I
2
C-bus 100 mA 24 V LED driver
2. Features
I
16 LED drivers. Each output programmable at:
N
Off
N
On
N
Programmable LED brightness
N
Programmable group dimming/blinking mixed with individual LED brightness
I
1 MHz Fast-mode Plus compatible I
2
C-bus interface with 30 mA high drive capability
on SDA output for driving high capacitive buses
I
256-step (8-bit) linear programmable brightness per LED output varying from fully off
(default) to maximum brightness using a 97 kHz PWM signal
I
256-step group brightness control allows general dimming (using a 190 Hz PWM
signal) from fully off to maximum brightness (default)
I
256-step group blinking with frequency programmable from 24 Hz to 10.73 s and duty
cycle from 0 % to 99.6 %
I
Sixteen open-drain outputs can sink between 0 mA to 100 mA and are tolerant to a
maximum off state voltage of 24 V. No input function.
I
Output state change programmable on the Acknowledge or the STOP Command to
update outputs byte-by-byte or all at the same time (default to ‘Change on STOP’).
I
Active LOW Output Enable (OE) input pin allows for hardware blinking and dimming of
the LEDs
I
7 hardware address pins allow 126 PCA9625 devices to be connected to the same
I
2
C-bus and to be individually programmed
I
4 software programmable I
2
C-bus addresses (one LED Group Call address and three
LED Sub Call addresses) allow groups of devices to be addressed at the same time in
any combination (for example, one register used for ‘All Call’ so that all the PCA9625s
on the I
2
C-bus can be addressed at the same time and the second register used for
three different addresses so that
1
⁄
3
of all devices on the bus can be addressed at the
same time in a group). Software enable and disable for I
2
C-bus address.
I
Software Reset feature (SWRST Call) allows the device to be reset through the
I
2
C-bus
I
25 MHz internal oscillator requires no external components
I
Internal power-on reset
I
Noise filter on SDA/SCL inputs
I
No glitch on power-up
I
Supports hot insertion
I
Low standby current
I
Operating power supply voltage (V
DD
) range of 2.3 V to 5.5 V; also requires
V
DD(DRV)FET
supply voltage range of 10 V to 24 V
I
5.5 V tolerant inputs on non-LED pins
I
−40 °C
to +85
°C
operation
I
ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115 and 1000 V CDM per JESD22-C101
I
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
I
Package offered: SO32
PCA9625_2
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 15 January 2008
2 of 33
NXP Semiconductors
PCA9625
16-bit Fm+ I
2
C-bus 100 mA 24 V LED driver
3. Applications
I
I
I
I
I
RGB or RGBA LED drivers
LED status information
LED displays
LCD backlights
Keypad backlights for cellular phones or handheld devices
4. Ordering information
Table 1.
Ordering information
Topside mark
PCA9625D
Package
Name
PCA9625D
SO32
Description
plastic small outline package; 32 leads; body width 7.5 mm
Version
SOT287-1
Type number
PCA9625_2
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 15 January 2008
3 of 33
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Product data sheet
Rev. 02 — 15 January 2008
OE
002aac786
© NXP B.V. 2008. All rights reserved.
PCA9625_2
5. Block diagram
NXP Semiconductors
A0
A1
A2
A3
A4
A5
A6
PCA9625
SCL
SDA
I
2
C-BUS
CONTROL
V
DD
V
SS
LED
STATE
SELECT
REGISTER
PWM
REGISTER X
BRIGHTNESS
CONTROL
POWER-ON
RESET
VOLTAGE
REGULATOR
INPUT FILTER
V
DD(DRV)FET
LEDn
97 kHz
25 MHz
OSCILLATOR
24.3 kHz
GRPFREQ
REGISTER
MUX/
CONTROL
GRPPWM
REGISTER
'0' – permanently OFF
'1' – permanently ON
FET
DRIVER
16-bit Fm+ I
2
C-bus 100 mA 24 V LED driver
190 Hz
V
SS(DRV)FET
PCA9625
Remark:
Only one LED output shown for clarity.
4 of 33
Fig 1.
Block diagram of PCA9625
NXP Semiconductors
PCA9625
16-bit Fm+ I
2
C-bus 100 mA 24 V LED driver
6. Pinning information
6.1 Pinning
LED13
LED14
LED15
OE
A5
A6
SCL
SDA
V
DD
1
2
3
4
5
6
7
8
9
32 LED12
31 V
SS(DRV)FET
30 LED11
29 LED10
28 LED9
27 LED8
26 V
DD(DRV)FET
25 V
SS
24 V
DD(DRV)FET
23 LED7
22 LED6
21 LED5
20 LED4
19 V
SS(DRV)FET
18 LED3
17 LED2
002aac787
PCA9625D
A0 10
A1 11
A2 12
A3 13
A4 14
LED0 15
LED1 16
Fig 2.
Pin configuration for SO32
6.2 Pin description
Table 2.
Symbol
LED13
LED14
LED15
OE
A5
A6
SCL
SDA
V
DD
A0
A1
A2
A3
A4
LED0
LED1
LED2
LED3
PCA9625_2
Pin description for SO32
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Type
O
O
O
I
I
I
I
I/O
power supply
I
I
I
I
I
O
O
O
O
Description
LED driver 13
LED driver 14
LED driver 15
active LOW output enable
address input 5
address input 6
serial clock line
serial data line
supply voltage
address input 0
address input 1
address input 2
address input 3
address input 4
LED driver 0
LED driver 1
LED driver 2
LED driver 3
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 15 January 2008
5 of 33
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