PCA9952; PCA9955
16-channel Fm+ I
2
C-bus 57 mA constant current LED driver
Rev. 7.1 — 29 June 2015
Product data sheet
1. General description
The PCA9952 and PCA9955 are I
2
C-bus controlled 16-channel constant current LED
driver optimized for dimming and blinking 57 mA Red/Green/Blue/Amber (RGBA) LEDs in
amusement products. Each LEDn output has its own 8-bit resolution (256 steps) fixed
frequency individual PWM controller that operates at 31.25 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
122 Hz and an adjustable frequency between 15 Hz to once every 16.8 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 LEDn 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 PCA9952 and PCA9955
operate with a supply voltage range of 3 V to 5.5 V and the constant current sink LEDn
outputs allow up to 40 V for the LED supply. The output peak current is adjustable with an
8-bit linear DAC from 225
A
to 57 mA.
These devices have built-in open, short load and overtemperature detection circuitry. The
error information from the corresponding register can be read via the I
2
C-bus. Additionally,
a thermal shutdown feature protects the device when internal junction temperature
exceeds the limit allowed for the process.
The PCA9952 and PCA9955 devices have Fast-mode Plus (Fm+) I
2
C-bus interface. Fm+
devices offer higher frequency (up to 1 MHz) or more densely populated bus operation
(up to 4000 pF).
The PCA9952 is identical to PCA9955 except for the following differences:
•
The PCA9952 has only three hardware address pins compared to four on PCA9955.
•
The PCA9952 has an output enable pin (OE) and the PCA9955 does not.
The active LOW output enable input pin (OE), available only on PCA9952, blinks all the
LEDn 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 PCA9952/55 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. On power-up, PCA9952/55 will have
a unique Sub Call address to identify it as a 16-channel LED driver. This allows mixing of
devices with different channel widths. Four hardware address pins on PCA9955 allow up
to 16 devices on the same bus. In the case of PCA9952, three hardware address pins
allow up to 8 devices on the same bus.
NXP Semiconductors
PCA9952; PCA9955
16-channel Fm+ I
2
C-bus 57 mA constant current LED driver
The Software Reset (SWRST) function allows the master to perform a reset of the
PCA9952/55 through the I
2
C-bus, identical to the Power-On Reset (POR) that initializes
the registers to their default state causing the output current switches to be OFF (LED off).
This allows an easy and quick way to reconfigure all device registers to the same
condition.
2. Features and benefits
16 LED drivers. Each output programmable at:
Off
On
Programmable LED brightness
Programmable group dimming/blinking mixed with individual LED brightness
Programmable LEDn output enable delay to reduce EMI and surge currents
16 constant current output channels can sink up to 57 mA, tolerate up to 40 V when
OFF
Output current adjusted through an external resistor
Output current accuracy
6
% between output channels
8
% between PCA9952/55 devices
Open/short load/overtemperature detection mode to detect individual LED errors
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
256-step (8-bit) linear programmable brightness per LEDn output varying from fully off
(default) to maximum brightness using a 31.25 kHz PWM signal
256-step group brightness control allows general dimming (using a 122 Hz PWM
signal) from fully off to maximum brightness (default)
256-step group blinking with frequency programmable from 15 Hz to 16.8 s and duty
cycle from 0 % to 99.6 %
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’).
Active LOW Output Enable (OE) input pin (only on PCA9952) allows for hardware
blinking and dimming of the LEDs
Four hardware address pins allow 16 PCA9955 devices to be connected to the same
I
2
C-bus and to be individually programmed
Four 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
PCA9952/55s 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 each
programmable I
2
C-bus address.
Unique power-up default Sub Call address allows mixing of devices with different
channel widths
Software Reset feature (SWRST Call) allows the device to be reset through the
I
2
C-bus
8 MHz internal oscillator requires no external components
PCA9952_PCA9955
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
Rev. 7.1 — 29 June 2015
2 of 48
NXP Semiconductors
PCA9952; PCA9955
16-channel Fm+ I
2
C-bus 57 mA constant current LED driver
Internal power-on reset
Noise filter on SDA/SCL inputs
No glitch on LED on power-up
Low standby current
Operating power supply voltage (V
DD
) range of 3 V to 5.5 V
5.5 V tolerant inputs on non-LED pins
Operating temperature:
20 C
to +85
C
(PCA9952TW, PCA9955TW)
40 C
to +85
C
(PCA9952TW/Q900, PCA9955TW/Q900)
ESD protection exceeds 2000 V HBM per JESD22-A114, 750 V CDM (PCA9952TW,
PCA9955TW), and 500 V CDM (PCA9952TW/Q900, PCA9955TW/Q900) per
JESD22-C101
Latch-up testing is done to JEDEC Standard JESD78 Class II, Level B
Packages offered: HTSSOP28
3. Applications
Amusement products
RGB or RGBA LED drivers
LED status information
LED displays
LCD backlights
Keypad backlights for cellular phones or handheld devices
Automotive lighting (PCA9952TW/Q900, PCA9955TW/Q900)
PCA9952_PCA9955
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
Rev. 7.1 — 29 June 2015
3 of 48
NXP Semiconductors
PCA9952; PCA9955
16-channel Fm+ I
2
C-bus 57 mA constant current LED driver
4. Ordering information
Table 1.
Ordering information
Topside
marking
PCA9952
Package
Name
HTSSOP28
Description
Version
plastic thermal enhanced thin shrink small outline package; SOT1172-2
28 leads; body width 4.4 mm; lead pitch 0.65 mm;
exposed die pad
plastic thermal enhanced thin shrink small outline package; SOT1172-2
28 leads; body width 4.4 mm; lead pitch 0.65 mm;
exposed die pad
plastic thermal enhanced thin shrink small outline package; SOT1172-2
28 leads; body width 4.4 mm; lead pitch 0.65 mm;
exposed die pad
plastic thermal enhanced thin shrink small outline package; SOT1172-2
28 leads; body width 4.4 mm; lead pitch 0.65 mm;
exposed die pad
Type number
PCA9952TW
PCA9952TW/Q900
[1]
PCA9952
HTSSOP28
PCA9955TW
PCA9955
HTSSOP28
PCA9955TW/Q900
[1]
PCA9955
HTSSOP28
[1]
PCA9952TW/Q900 and PCA9955TW/Q900 are AEC-Q100 compliant.
4.1 Ordering options
Table 2.
Ordering options
Orderable
part number
PCA9952TW,118
Package
Packing method
Minimum
order
quantity
2500
2500
2500
2500
Temperature
Type number
PCA9952TW
PCA9952TW/Q900
PCA9955TW
PCA9955TW/Q900
HTSSOP28
Reel 13” Q1/T1
*standard mark SMD
Reel 13” Q1/T1
*standard mark SMD
Reel 13” Q1/T1
*standard mark SMD
Reel 13” Q1/T1
*standard mark SMD
T
amb
=
20 C
to +85
C
T
amb
=
40 C
to +85
C
T
amb
=
20 C
to +85
C
T
amb
=
40 C
to +85
C
PCA9952TW/Q900,118 HTSSOP28
PCA9955TW,118
HTSSOP28
PCA9955TW/Q900,118 HTSSOP28
PCA9952_PCA9955
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
Rev. 7.1 — 29 June 2015
4 of 48
NXP Semiconductors
PCA9952; PCA9955
16-channel Fm+ I
2
C-bus 57 mA constant current LED driver
5. Block diagram
A0 A1 A2 A3/OE
(1)
REXT
I/O
REGULATOR
LED0
LED1
LED14
LED15
PCA9952/55
DAC0
SCL
SDA
INPUT FILTER
individual LED
current setting
8-bit DACs
DAC1
I
2
C-BUS
CONTROL
DAC
14
DAC
15
V
DD
V
SS
RESET
200 kΩ
POWER-ON
RESET
OUTPUT DRIVER, DELAY CONTROL
AND ERROR DETECTION
INPUT
FILTER
LED STATE
SELECT
REGISTER
PWM
REGISTER X
BRIGHTNESS
CONTROL
repetion rate 31.25 kHz
÷
256
8 MHz
OSCILLATOR
31.25 kHz
GRPFREQ
REGISTER
GRPPWM
REGISTER
(DUTY CYCLE
CONTROL)
'0' – permanently OFF
'1' – permanently ON
MUX/
CONTROL
DIM CLOCK
002aae909
Dim repetition rate = 122 Hz.
Blink repetition rate = 15 Hz to every 16.8 seconds.
(1) On PCA9955 this pin is address pin A3. On PCA9952 this pin is OE.
Fig 1.
Block diagram of PCA9952/55
PCA9952_PCA9955
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
Rev. 7.1 — 29 June 2015
5 of 48
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