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NXP Semiconductors
PCA9632
4-bit Fm+ I 2 C-bus low power LED driver
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9 10 11 12
507
508
509
510
511
512
1
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3
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5
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7
8
9 10 11
brightness control signal (LEDn)
N × 2.5 μ s
with N = (0 to 256)
(PWMx Register)
256 × 2.5 μ s = 640 μ s
(1.5625 kHz)
002aad101
Minimum pulse width for LEDn brightness control is 2.5 ? s.
Fig 9.
Individual LED brightness control signals
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8
9 10 11 12
27 28 29 30 31 32 1
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8
9 10 11
brightness control signal (LEDn)
N × 2.5 μs
with N = (0 to 64)
M × 64 × 2 × 2.5 μs
with M = (1 to 16)
(GRPPWM Register)
(PWMx Register)
64 × 2.5 μs = 160 μs
(6.25 kHz)
group dimming signal
16 × 64 × 2 × 2.5 μs = 5.24 ms (190.7 Hz)
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resulting brightness + group dimming signal (M = 4)
002aad042
Minimum pulse width for LEDn brightness control is 2.5 ? s.
Minimum pulse width for group dimming is 320 ? s (M = 1).
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 ? 2.5 ? s, with ‘N’ defined in PWMx register).
Fig 10. Brightness + group dimming signals
Table 16.
Dimming and blinking resolution
Type of control
LDRx
DMBLNK
GRPPWM
GRPFREQ
Frequency
PWMx
Individual LED brightness 10
X
X
X
1.5625 kHz
256 steps
without dimming
Individual LED brightness 11
0
16 steps
X
190 Hz with 6.25 kHz modulation
64 steps
with global dimming
Blinking (fast)
11
1
64 steps
256 steps
blink frequency = 6 Hz to 24 Hz
256 steps
PWMx frequency = 1.5625 kHz
Blinking (slow)
11
1
256 steps
256 steps
blink frequency = 0.09 Hz to 6 Hz
256 steps
PWMx frequency = 1.5625 kHz
PCA9632
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 27 July 2011
? NXP B.V. 2011. All rights reserved.
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