pca9632 NXP Semiconductors, pca9632 Datasheet - Page 15

• Manufacturer Part Number: pca9632
• Description: Pca9632 4-bit Fm I?c-bus Low Power Led Driver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9632_1
Objective data sheet
Fig 7. Individual LED Brightness Control signals
Fig 8. Brightness + Group Dimming signals
1
1
1
Brightness Control signal (LEDn)
Brightness Control signal (LEDn)
Group Dimming signal
resulting Brightness + Group Dimming signal
Minimum pulse width for LEDn Brightness Control is 2.5 s.
Minimum pulse width for LEDn Brightness Control is 2.5 s.
Minimum pulse width for Group Dimming is 80 s.
When M = 1 (GRPPWM register value), the resulting LEDn Brightness Control + Group Dimming signal will have 2 pulses
of the LED Brightness Control signal (pulse width = N
2
2
2
(GRPPWM Register)
M
with M = (1 to 16)
3
3
3
16
4
4
4
2
7.7 Individual brightness control with group dimming/blinking
5
5
5
2.5 s
6
6
6
A 1.5625 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 4 LED outputs):
7
7
7
•
•
16
8
8
8
A lower 190 Hz fixed frequency signal with programmable duty cycle (4 bits, 16 steps)
is used to provide a global brightness control.
A programmable frequency signal from 24 Hz to
programmable duty cycle (6 bits, 64 steps) is used to provide a global blinking control
for (24 Hz to 6 Hz) and (8 bits, 256 steps) for (6 Hz to
2
9 10 11 12
9 10 11 12
256
2.5 s = 5.24 ms (190.7 Hz)
Rev. 01 — 28 September 2007
256
(1.5625 kHz)
64
(6.25 kHz)
2.5 s = 160 s
2.5 s = 640 s
2.5 s, with ‘N’ defined in PWMx register).
N
with N = (0 to 256)
(PWMx Register)
N
with N = (0 to 64)
(PWMx Register)
2.5 s
2.5 s
507
507
508
508
509
509
510
510
4-bit Fm+ I
511
511
512
512
1
10.73
1
1
1
2
2
2
1
2
Hz (8 bits, 256 steps) with
10.73
C-bus low power LED driver
3
3
3
4
4
4
Hz).
5
5
5
6
6
6
PCA9632
© NXP B.V. 2007. All rights reserved.
7
7
7
8
8
8
9 10 11
9 10 11
002aad101
002aad042
15 of 32