PCA9952TW,118 NXP Semiconductors, PCA9952TW,118 Datasheet - Page 24

• Manufacturer Part Number: PCA9952TW,118
• Description: LED Lighting Drivers 16-ch Fm+ I2C-bus 57 mA LED driver
• Manufacturer: NXP Semiconductors

Specifications of PCA9952TW,118

• Rohs: yes
• Input Voltage: 3 V to 5.5 V
• Operating Frequency: 31.25 kHz
• Maximum Supply Current: 15 mA
• Output Current: 62 mA
• Mounting Style: SMD/SMT
• Package / Case: HTSSOP-28
• Factory Pack Quantity: 2500

NXP Semiconductors
PCA9952_PCA9955
Product data sheet
Fig 9.
1
1
Brightness Control signal (LEDn)
Group Dimming signal
resulting Brightness + Group Dimming signal
2
(GRPPWM Register)
2
Minimum pulse width for LEDn Brightness Control is 125 ns.
Minimum pulse width for Group Dimming is 32 s.
When M = 1 (GRPPWM register value), the resulting LEDn Brightness Control + Group Dimming signal will have 1 pulse of the
LED Brightness Control signal (pulse width = N  125 ns, with ‘N’ defined in PWMx register).
This resulting Brightness + Group Dimming signal above shows a resulting Control signal with M = 8.
Brightness + Group Dimming signals
with M = (0 to 255)
M × 256 × 125 ns
3
3
4
4
7.8 Individual brightness control with group dimming/blinking
5
5
6
6
The I
as a ‘SWRST Call Abort’. The PCA9952/55 does not initiate a reset of its registers. This
happens only when the format of the SWRST Call sequence is not correct.
A 31.25 kHz fixed frequency signal with programmable duty cycle (8 bits, 256 steps) is
used to control individually the brightness for each LED.
On top of this signal, one of the following signals can be superimposed (this signal can be
applied to the 16 LEDn outputs control registers LEDOUT0 to LEDOUT3):
7
7
Fig 8.
•
•
8
8
256 × 256 × 125 ns = 8.19 ms (122 Hz)
A lower 122 Hz fixed frequency signal with programmable duty cycle (8 bits,
256 steps) is used to provide a global brightness control.
A programmable frequency signal from 15 Hz to every 16.8 seconds (8 bits,
256 steps) with programmable duty cycle (8 bits, 256 steps) is used to provide a
global blinking control.
2
C-bus master must interpret a non-acknowledge from the PCA9952/55 (at any time)
9 10 11 12
SWRST Call
All information provided in this document is subject to legal disclaimers.
S
START condition
0
0
General Call address
256 × 125 ns = 32 μs
(31.25 kHz)
Rev. 6 — 22 April 2013
0
16-channel Fm+ I
0
0
N × 125 ns
with N = (0 to 255)
(PWMx Register)
0
251
0
252
0
253
A
acknowledge
from slave
2
254
C-bus 57 mA constant current LED driver
0
PCA9952; PCA9955
255
0
SWRST data byte 1
256
0
1
1
0
2
2
0
3
3
1
acknowledge
from slave
4
4
1
5
5
0
condition
002aac900
STOP
6
6
A
© NXP B.V. 2013. All rights reserved.
7
7
P
8
8
9 10 11
002aaf935
24 of 47