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PCA9955Q900 Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer PCA9955Q900
Beschreibung 16-channel constant current LED driver
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 30 Seiten
PCA9955Q900 Datasheet, Funktion
PCA9952/Q900; PCA9955/Q900
16-channel Fm+ I2C-bus 57 mA constant current LED driver,
AEC-Q100 compliant
Rev. 1 — 26 April 2013
Product data sheet
1. General description
The PCA9952/Q900 and PCA9955/Q900 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/Q900 and
PCA9955/Q900 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/Q900 and PCA9955/Q900 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/Q900 is identical to PCA9955/Q900 except for the following differences:
The PCA9952/Q900 has only three hardware address pins compared to four on
PCA9955/Q900.
The PCA9952/Q900 has an output enable pin (OE) and the PCA9955/Q900 does not.
The active LOW output enable input pin (OE), available only on PCA9952/Q900, 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/Q900, PCA9955/Q900 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/Q900, PCA9955/Q900 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






PCA9955Q900 Datasheet, Funktion
NXP Semiconductors
PCA9952/Q900; PCA9955/Q900
16-channel Fm+ I2C-bus 57 mA constant current LED driver, AEC-Q100
6.2 Pin description
Table 3.
Symbol
REXT
A0
A1
A2
A3
LED0
LED1
LED2
LED3
LED4
LED5
LED6
LED7
LED8
LED9
LED10
LED11
LED12
LED13
LED14
LED15
RESET
SCL
SDA
VSS
VDD
PCA9955/Q900 pin description
Pin Type
Description
1I
current set resistor input; resistor to ground
2I
address input 0[1]
3I
address input 1[1]
4I
address input 2[1]
5I
address input 3[1]
6O
LED driver 0
7O
LED driver 1
8O
LED driver 2
9O
LED driver 3
11 O
LED driver 4
12 O
LED driver 5
13 O
LED driver 6
14 O
LED driver 7
15 O
LED driver 8
16 O
LED driver 9
17 O
LED driver 10
18 O
LED driver 11
20 O
LED driver 12
21 O
LED driver 13
22 O
LED driver 14
23 O
LED driver 15
25 I
active LOW reset input
26 I
serial clock line
27 I/O
serial data line
10, 19, 24[2] ground
supply ground
28 power supply supply voltage
[1] In order to obtain the best system level ESD performance, a standard pull-up resistor (10 ktypical) is
required for any address pin connecting to VDD. For additional information on system level ESD
performance, please refer to application notes AN10897 and AN11131.
[2] HTSSOP28 package supply ground is connected to both VSS pins and exposed center pad. VSS pins 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.
PCA9952Q900_PCA9955Q900
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 26 April 2013
© NXP B.V. 2013. All rights reserved.
6 of 45

6 Page









PCA9955Q900 pdf, datenblatt
NXP Semiconductors
PCA9952/Q900; PCA9955/Q900
16-channel Fm+ I2C-bus 57 mA constant current LED driver, AEC-Q100
Table 6. Register summary[1] …continued
Register
D6 D5 D4 D3 D2 D1 D0 Name
number
(hexadecimal)
Type
27h
0 1 0 0 1 1 1 IREF5
read/write
28h
0 1 0 1 0 0 0 IREF6
read/write
29h
0 1 0 1 0 0 1 IREF7
read/write
2Ah
0 1 0 1 0 1 0 IREF8
read/write
2Bh
0 1 0 1 0 1 1 IREF9
read/write
2Ch
0 1 0 1 1 0 0 IREF10
read/write
2Dh
0 1 0 1 1 0 1 IREF11
read/write
2Eh
0 1 0 1 1 1 0 IREF12
read/write
2Fh
0 1 0 1 1 1 1 IREF13
read/write
30h
0 1 1 0 0 0 0 IREF14
read/write
31h
0 1 1 0 0 0 1 IREF15
read/write
32h to 39h
--------
read/write
3Ah
0 1 1 1 0 1 0 OFFSET
read/write
3Bh
0 1 1 1 0 1 1 SUBADR1
read/write
3Ch
0 1 1 1 1 0 0 SUBADR2
read/write
3Dh
0 1 1 1 1 0 1 SUBADR3
read/write
3Eh 0 1 1 1 1 1 0 ALLCALLADR read/write
3Fh 0 1 1 1 1 1 1 RESERVED1 read/write
40h 1 0 0 0 0 0 0 RESERVED2 read only
41h 1 0 0 0 0 0 1 RESERVED3 read only
42h
1 0 0 0 0 1 0 PWMALL
write only
43h
1 0 0 0 0 1 1 IREFALL
write only
44h
45h
46h to 7Fh
1 0 0 0 1 0 0 EFLAG0
1 0 0 0 1 0 1 EFLAG1
--------
read only
read only
read only
[1] Remark: Writing to registers marked ‘not used’ will return a NACK.
[2] Remark: Writing to registers marked ‘reserved’ will not change any functionality in the chip.
Function
output gain control register 5
output gain control register 6
output gain control register 7
output gain control register 8
output gain control register 9
output gain control register 10
output gain control register 11
output gain control register 12
output gain control register 13
output gain control register 14
output gain control register 15
not used[1]
Offset/delay on LEDn outputs
I2C-bus subaddress 1
I2C-bus subaddress 2
I2C-bus subaddress 3
All Call I2C-bus address
reserved[2]
reserved[2]
reserved[2]
brightness control for all LEDn
output gain control for all
registers IREF0 to IREF15
output error flag 0
output error flag 1
not used[1]
PCA9952Q900_PCA9955Q900
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 26 April 2013
© NXP B.V. 2013. All rights reserved.
12 of 45

12 Page





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