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PDF PCU9955 Data sheet ( Hoja de datos )
| Número de pieza | PCU9955 | |
| Descripción | 16-channel UFm I2C-bus 57mA constant current LED driver | |
| Fabricantes | NXP Semiconductors | |
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PCU9955
16-channel UFm I2C-bus 57 mA constant current LED driver
Rev. 2.1 — 29 June 2015
Product data sheet
1. General description
The PCU9955 is an Ultra-Fast mode (UFm) 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 PCU9955 operates 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 current is adjustable with an 8-bit linear DAC
from 225 A to 57 mA.
This device has built-in open, short load and overtemperature detection circuitry. The
thermal shutdown feature protects the device when internal junction temperature exceeds
the limit allowed for the process.
The PCU9955 device is the first LED controller device in a new Ultra Fast-mode (UFm)
I2C-bus family. UFm I2C-bus devices offer higher frequency (up to 5 MHz). The UFm
I2C-bus slave devices operate in receive-only mode. That is, only I2C writes to PCU9955
are supported. As such, there are no status registers in PCU9955. The PCU9955 allows
significantly higher data transfer rate compared to the Fast-mode Plus versions
(PCA9952/55).
Software programmable LED Group and three Sub Call I2C-bus addresses allow all or
defined groups of PCU9955 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, thus minimizing I2C-bus
commands. On power-up, PCU9955 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 PCU9955 allow up to 16 devices on the same bus.
The Software Reset (SWRST) function allows the master to perform a reset of the
PCU9955 through the I2C-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.
1 page  
NXP Semiconductors
6. Pinning information
6.1 Pinning
PCU9955
16-channel UFm I2C-bus 57 mA constant current LED driver
REXT 1
A0 2
A1 3
A2 4
A3 5
LED0 6
LED1 7
LED2 8
LED3 9
VSS 10
LED4 11
LED5 12
LED6 13
LED7 14
PCU9955TW
(1)
28 VDD
27 USDA
26 USCL
25 RESET
24 VSS
23 LED15
22 LED14
21 LED13
20 LED12
19 VSS
18 LED11
17 LED10
16 LED9
15 LED8
002aaf094
(1) Thermal pad; connected to VSS.
Fig 2. Pin configuration for HTSSOP28
6.2 Pin description
Table 2.
Symbol
REXT
A0
A1
A2
A3
LED0
LED1
LED2
LED3
LED4
LED5
LED6
LED7
LED8
LED9
LED10
LED11
LED12
Pin description
Pin Type
1I
2I
3I
4I
5I
6O
7O
8O
9O
11 O
12 O
13 O
14 O
15 O
16 O
17 O
18 O
20 O
Description
current set resistor input; resistor to ground
address input 0[1]
address input 1[1]
address input 2[1]
address input 3[1]
LED driver 0
LED driver 1
LED driver 2
LED driver 3
LED driver 4
LED driver 5
LED driver 6
LED driver 7
LED driver 8
LED driver 9
LED driver 10
LED driver 11
LED driver 12
PCU9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.1 — 29 June 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
5 of 40
5 Page 
NXP Semiconductors
PCU9955
16-channel UFm I2C-bus 57 mA constant current LED driver
7.3.1 MODE1 — Mode register 1
Table 5. MODE1 - Mode register 1 (address 00h) bit description
Legend: * default value.
Bit Symbol Access Value Description
7 AIF
-
- not used
6 AI1
W only 0*
Auto-Increment bit 1 = 0. Auto-increment range as defined
in Table 3.
1 Auto-Increment bit 1 = 1. Auto-increment range as defined
in Table 3.
5 AI0
W only 0*
Auto-Increment bit 0 = 0. Auto-increment range as defined
in Table 3.
1 Auto-Increment bit 0 = 1. Auto-increment range as defined
in Table 3.
4 SLEEP W only 0*
Normal mode[1].
1 Low power mode. Oscillator off[2][3].
3 SUB1
W only 0
PCU9955 does not respond to I2C-bus subaddress 1.
1* PCU9955 responds to I2C-bus subaddress 1.
2 SUB2
W only 0*
PCU9955 does not respond to I2C-bus subaddress 2.
1 PCU9955 responds to I2C-bus subaddress 2.
1 SUB3
W only 0*
PCU9955 does not respond to I2C-bus subaddress 3.
1 PCU9955 responds to I2C-bus subaddress 3.
0 ALLCALL W only 0
PCU9955 does not respond to LED All Call I2C-bus
address.
1* PCU9955 responds to LED All Call I2C-bus address.
[1] It takes 500 s max. for the oscillator to be up and running once SLEEP bit has been set to logic 0. Timings
on LEDn outputs are not guaranteed if PWMx, GRPPWM or GRPFREQ registers are accessed within the
500 s window.
[2] No blinking or dimming is possible when the oscillator is off.
[3] The device must be reset if the LED driver output state is set to LDRx=11 after the device is set back to
Normal mode.
7.3.2 MODE2 — Mode register 2
Table 6. MODE2 - Mode register 2 (address 01h) bit description
Legend: * default value.
Bit Symbol Access Value Description
7-
- - not used
6-
- - not used
5 DMBLNK W only 0*
group control = dimming.
1 group control = blinking.
4-
- 0* reserved
3 OCH
W only 0*
outputs change on STOP command[1]
1 outputs change on ACK, this 9th bit is always set to 1 by
UFm I2C-bus master
PCU9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.1 — 29 June 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
11 of 40
11 Page | ||
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