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PDF PCA9955 Data sheet ( Hoja de datos )
| Número de pieza | PCA9955 | |
| Descripción | 16-channel constant current LED driver | |
| Fabricantes | NXP Semiconductors | |
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PCA9952; PCA9955
16-channel Fm+ I2C-bus 57 mA constant current LED driver
Rev. 7.1 — 29 June 2015
Product data sheet
1. General description
The PCA9952 and PCA9955 are I2C-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 I2C-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+) I2C-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 I2C-bus addresses allow all or
defined groups of PCA9952/55 devices to respond to a common I2C-bus address,
allowing for example, all red LEDs to be turned on or off at the same time or marquee
chasing effect, thus minimizing I2C-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.
1 page  
NXP Semiconductors
5. Block diagram
PCA9952; PCA9955
16-channel Fm+ I2C-bus 57 mA constant current LED driver
PCA9952/55
A0 A1 A2 A3/OE(1) REXT
I/O
REGULATOR
LED0
LED1
LED14
LED15
SCL
SDA
VDD
VSS
RESET
DAC0
INPUT FILTER
POWER-ON
RESET
200 kΩ
I2C-BUS
CONTROL
individual LED
current setting
8-bit DACs
DAC1
DAC
14
DAC
15
OUTPUT DRIVER, DELAY CONTROL
AND ERROR DETECTION
INPUT
FILTER
PWM
REGISTER X
BRIGHTNESS
CONTROL
repetion rate 31.25 kHz
LED STATE
SELECT
REGISTER
÷ 256
31.25 kHz
8 MHz
OSCILLATOR
GRPFREQ
REGISTER
DIM CLOCK
GRPPWM
REGISTER
(DUTY CYCLE
CONTROL)
'0' – permanently OFF
'1' – permanently ON
MUX/
CONTROL
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
002aae909
PCA9952_PCA9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7.1 — 29 June 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
5 of 48
5 Page 
NXP Semiconductors
PCA9952; PCA9955
16-channel Fm+ I2C-bus 57 mA constant current LED driver
Table 5. Auto-Increment options
AIF AI1[1] AI0[1] Function
0 0 0 no Auto-Increment
1 0 0 Auto-Increment for registers (00h to 41h). D[6:0] roll over to 00h after the last
register 41h is accessed.
1 0 1 Auto-Increment for individual brightness registers only (0Ah to 19h). D[6:0] roll
over to 0Ah after the last register (19h) is accessed.
1 1 0 Auto-Increment for MODE1 to IREF15 control registers (00h to 31h).
D[6:0] roll over to 00h after the last register (31h) is accessed.
1 1 1 Auto-Increment for global control registers and individual brightness registers
(08h to 19h). D[6:0] roll over to 08h after the last register (19h) is accessed.
[1] AI1 and AI0 come from MODE1 register.
Remark: Other combinations not shown in Table 5 (AIF + AI[1:0] = 001b, 010b and 011b)
are reserved and must not be used for proper device operation.
AIF + AI[1:0] = 000b is used when the same register must be accessed several times
during a single I2C-bus communication, for example, changes the brightness of a single
LED. Data is overwritten each time the register is accessed during a write operation.
AIF + AI[1:0] = 100b is used when all the registers must be sequentially accessed, for
example, power-up programming.
AIF + AI[1:0] = 101b is used when the 16 LED drivers must be individually programmed
with different values during the same I2C-bus communication, for example, changing color
setting to another color setting.
AIF + AI[1:0] = 110b is used when MODE1 to IREF15 registers must be programmed with
different settings during the same I2C-bus communication.
AIF + AI[1:0] = 111b is used when the 16 LED drivers must be individually programmed
with different values in addition to global programming.
Only the 7 least significant bits D[6:0] are affected by the AIF, AI1 and AI0 bits.
When the Control register is written, the register entry point determined by D[6:0] is the
first register that will be addressed (read or write operation), and can be anywhere
between 00h and 41h (as defined in Table 6). When AIF = 1, the Auto-Increment Flag is
set and the rollover value at which the register increment stops and goes to the next one
is determined by AIF, AI1 and AI0. See Table 5 for rollover values. For example, if MODE1
register bit AI1 = 0 and AI0 = 1 and if the Control register = 1001 0000, then the register
addressing sequence will be (in hexadecimal):
10 11 … 19 0A 0B … 19 0A 0B … as long as the master
keeps sending or reading data.
If MODE1 register bit AI1 = 0 and AI0 = 0 and if the Control register = 1010 0010, then the
register addressing sequence will be (in hexadecimal):
22 23 … 41 00 01 … 19 0A 0B … as long as the master
keeps sending or reading data.
PCA9952_PCA9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7.1 — 29 June 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
11 of 48
11 Page | ||
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