PCA9634PW NXP Semiconductors, PCA9634PW Datasheet - Page 19

• Manufacturer Part Number: PCA9634PW
• Description: IC, LED DRIVER, RGBA, 20-TSSOP
• Manufacturer: NXP Semiconductors

Specifications of PCA9634PW

• No. Of Outputs: 8
• Output Current: 25mA
• Output Voltage: 5.5V
• Input Voltage: 2.3V To 5.5V
• Dimming Control Type: PWM
• Driver Case Style: TSSOP
• Switching Frequency: 1MHz
• Base Number: 9634
• Operating: RoHS Compliant
• Number Of Segments: 16
• Low Level Output Current: 200 mA
• High Level Output Current: 50 uA
• Operating Supply Voltage: 2.3 V to 5.5 V
• Maximum Supply Current: 10 mA
• Maximum Power Dissipation: 400 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-20
• Minimum Operating Temperature: - 40 C
• Led Driver Application: RGB Or RGBA LED Drivers, LED Status Information, Displays, Backlights
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Details

NXP Semiconductors
PCA9634_6
Product data sheet
Fig 8.
1
1
Brightness Control signal (LEDn)
Group Dimming signal
resulting Brightness + Group Dimming signal
2
2
(GRPPWM Register)
M
Minimum pulse width for LEDn Brightness Control is 40 ns.
Minimum pulse width for Group Dimming is 20.48 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
This resulting Brightness + Group Dimming signal above shows a resulting Control signal with M = 4 (8 pulses).
Brightness + Group Dimming signals
with M = (0 to 255)
3
3
256
4
4
7.8 Individual brightness control with group dimming/blinking
2
5
5
40 ns
6
6
A 97 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
•
•
256
8
8
A lower 190 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 24 Hz to
programmable duty cycle (8 bits, 256 steps) is used to provide a global blinking
control.
9 10 11 12
2
256
40 ns = 5.24 ms (190.7 Hz)
Rev. 06 — 12 September 2008
256
(97.6 kHz)
40 ns = 10.24 s
40 ns, with ‘N’ defined in PWMx register).
N
with N = (0 to 255)
(PWMx Register)
40 ns
507
508
509
510
511
512
1
10.73
1
1
2
2
8-bit Fm+ I
Hz (8 bits, 256 steps) with
3
3
4
4
5
5
6
6
PCA9634
2
© NXP B.V. 2008. All rights reserved.
C-bus LED driver
7
7
8
8
9 10 11
002aab417
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