PCA9632
4-bit Fm+ I
2
C-bus low power LED driver
Rev. 03 — 15 July 2008
Product data sheet
1. General description
The PCA9632 is an I
2
C-bus controlled 4-bit LED driver optimized for
Red/Green/Blue/Amber (RGBA) color mixing applications. The PCA9632 is a drop-in
upgrade for the PCA9633 with 40× power reduction. In Individual brightness control mode,
each LED output has its own 8-bit resolution (256 steps) fixed frequency Individual PWM
controller that operates at 1.5625 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. In group dimming mode,
each LED output has its own 6-bit resolution (64 steps) fixed frequency Individual PWM
controller that operates at 6.25 kHz with a duty cycle that is adjustable from 0 % to 98.4 %
to allow the LED to be set to a specific brightness value. A fifth 4-bit resolution (16 steps)
Group PWM controller has a fixed frequency of 190 Hz that is used to dim all the LEDs
with the same value.
While operating in the Blink mode, each LED output has its own 8-bit resolution
(256 steps) fixed frequency Individual PWM controller that operates at 1.5625 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. Blink rate is controlled by the Group frequency setting that has 8-bit
resolution (256 steps). The blink rate is adjustable between 24 Hz and once every
10.73 seconds. For Group frequency settings between 6 Hz and 24 Hz, the Group PWM
has a 6-bit resolution (64 steps) with a duty cycle that is adjustable from 0 % to 98.4 %.
For Group frequency settings between 6 Hz and 0.09 Hz (once in 10.73 seconds), the
Group PWM has an 8-bit resolution (256 steps) with a duty cycle that is adjustable from
0 % to 99.6 %.
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 LED output driver is
programmed to be either open-drain with a 25 mA current sink capability at 5 V or
totem pole with a 25 mA sink, 10 mA source capability at 5 V. The PCA9632 operates with
a supply voltage range of 2.3 V to 5.5 V and the outputs are 5.5 V tolerant. LEDs can be
directly connected to the LED output (up to 25 mA, 5.5 V) or controlled with external
drivers and a minimum amount of discrete components for larger current or higher voltage
LEDs.
The PCA9632 is in the 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).
Software programmable LED Group and three Sub Call I
2
C-bus addresses allow all or
defined groups of PCA9632 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.
NXP Semiconductors
PCA9632
4-bit Fm+ I
2
C-bus low power LED driver
The Software Reset (SWRST) Call allows the master to perform a reset of the PCA9632
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-impedance. This allows an easy and
quick way to reconfigure all device registers to the same condition.
2. Features
I
40× power reduction compared to PCA9633
I
4 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 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 1.5625 kHz PWM signal in Individual
brightness mode
I
64-step (6-bit) linear programmable brightness for each LED output varying from fully
off (default) to maximum brightness using a 6.25 kHz PWM signal in group dimming
mode
I
In group dimming mode, 16-step group brightness control allows global dimming
(using a 190 Hz PWM signal) from fully off to maximum brightness (default)
I
256-step (8-bit) linear programmable brightness per LED output varying from fully off
(default) to maximum brightness using a 1.5625 kHz PWM signal in group blinking
mode
I
64-step group blinking with frequency programmable from 24 Hz to 6 Hz and
duty cycle from 0 % to 98.4 %
I
256-step group blinking with frequency programmable from 6 Hz to 0.09 Hz (10.73 s)
and duty cycle from 0 % to 99.6 %
I
Four totem pole outputs (sink 25 mA and source 10 mA at 5 V) with software
programmable open-drain LED outputs selection (default at high-impedance). No input
function.
I
10-pin package option provides two hardware address pins allowing four devices to
operate on the same bus
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
Software Reset feature (SWRST Call) allows the device to be reset through the
I
2
C-bus
I
400 kHz internal oscillator requires no external components
I
Internal power-on reset
I
Noise filter on SDA/SCL inputs
I
Edge rate control on outputs
I
No glitch on power-up
I
Supports hot insertion
I
Low standby current of < 1
µA
I
Operating power supply voltage range of 2.3 V to 5.5 V
PCA9632_3
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 15 July 2008
2 of 38
NXP Semiconductors
PCA9632
4-bit Fm+ I
2
C-bus low power LED driver
I
5.5 V tolerant inputs
I
−40 °C
to +85
°C
operation
I
ESD protection exceeds 5000 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
Packages offered: TSSOP8, TSSOP10, HVSON8, HVSON10
3. Applications
I
I
I
I
I
RGB or RGBA LED drivers for color mixing
LED status information
LED displays
LCD backlights
Keypad backlights for cellular phones or handheld devices
4. Ordering information
Table 1.
Ordering information
Topside
mark
9632
9632
9632
9632
Package
Name
TSSOP8
TSSOP10
HVSON8
HVSON10
Description
plastic thin shrink small outline package; 8 leads;
body width 3 mm
plastic thin shrink small outline package; 10 leads;
body width 3 mm
plastic thermal enhanced very thin small outline package;
no leads; 8 terminals; body 3
×
3
×
0.85 mm
plastic thermal enhanced very thin small outline package;
no leads; 10 terminals; body 3
×
3
×
0.85 mm
Version
SOT505-1
SOT552-1
SOT908-1
SOT650-1
Type number
PCA9632DP1
PCA9632DP2
PCA9632TK
PCA9632TK2
PCA9632_3
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 15 July 2008
3 of 38
NXP Semiconductors
PCA9632
4-bit Fm+ I
2
C-bus low power LED driver
5. Block diagram
10-pin version
A0
A1
PCA9632
SCL
SDA
I
2
C-BUS
CONTROL
V
DD
V
SS
POWER-ON
RESET
LED
STATE
SELECT
REGISTER
PWM
REGISTER X
BRIGHTNESS
CONTROL
24 Hz
to
0.09 Hz
GRPPWM
REGISTER
'0' – permanently OFF
'1' – permanently ON
002aad039
INPUT FILTER
V
DD
LEDn
6.25 kHz/
1.56 kHz
400 kHz
OSCILLATOR
GRPFREQ
REGISTER
MUX/
CONTROL
190 Hz
Fig 1.
Block diagram of PCA9632
PCA9632_3
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 15 July 2008
4 of 38
NXP Semiconductors
PCA9632
4-bit Fm+ I
2
C-bus low power LED driver
6. Pinning information
6.1 Pinning
LED0
LED1
LED2
LED3
1
2
3
4
002aad040
8
7
V
DD
SDA
SCL
V
SS
LED0
LED1
LED2
LED3
A0
1
2
3
4
5
002aad637
10 V
DD
9
SDA
SCL
A1
V
SS
PCA9632DP1
PCA9632DP2
8
7
6
6
5
Fig 2.
Pin configuration for TSSOP8
Fig 3.
Pin configuration for TSSOP10
terminal 1
index area
LED0
LED1
LED2
LED3
1
2
8
7
V
DD
SDA
terminal 1
index area
LED0
LED1
1
2
3
4
5
10 V
DD
9
SDA
SCL
A1
V
SS
PCA9632TK
3
4
6
5
SCL
V
SS
LED2
LED3
A0
PCA9632TK2
8
7
6
002aad041
002aad638
Transparent top view
Transparent top view
Fig 4.
Pin configuration for HVSON8
Fig 5.
Pin configuration for HVSON10
6.2 Pin description
Table 2.
Symbol
LED0
LED1
LED2
LED3
V
SS
SCL
SDA
V
DD
[1]
Pin description for TSSOP8 and HVSON8
Pin
1
2
3
4
5
[1]
6
7
8
Type
O
O
O
O
power supply
I
I/O
power supply
Description
LED driver 0
LED driver 1
LED driver 2
LED driver 3
supply ground
serial clock line
serial data line
supply voltage
HVSON8 package die supply ground is connected to both the V
SS
pin and the exposed center pad. The
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.
PCA9632_3
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 15 July 2008
5 of 38
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