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NXP Semiconductors
PCA9625
16-bit Fm+ I 2 C-bus 100 mA 24 V LED driver
A 97 kHz ?xed frequency signal is used for each output. Duty cycle is controlled through
256 linear steps from 00h (0 % duty cycle = LED output off) to FFh
(99.6 % duty cycle = LED output at maximum brightness). Applicable to LED outputs
programmed with LDRx = 10 or 11 (LEDOUT0 to LEDOUT3 registers).
IDCx [ 7 : 0 ]
duty cycle = ---------------------------
256
7.3.4 GRPPWM, group duty cycle control
Table 8. GRPPWM - Group brightness control register (address 12h) bit description
Legend: * default value
(1)
Address
12h
Register
GRPPWM
Bit
7:0
Symbol
GDC[7:0]
Access
R/W
Value
1111 1111
Description
GRPPWM register
When DMBLNK bit (MODE2 register) is programmed with logic 0, a 190 Hz ?xed
frequency signal is superimposed with the 97 kHz individual brightness control signal.
GRPPWM is then used as a global brightness control allowing the LED outputs to be
dimmed with the same value. The value in GRPFREQ is then a ‘Don’t care’.
General brightness for the 16 outputs is controlled through 256 linear steps from 00h
(0 % duty cycle = LED output off) to FFh (99.6 % duty cycle = maximum brightness).
Applicable to LED outputs programmed with LDRx = 11 (LEDOUT0 to LEDOUT3
registers).
When DMBLNK bit is programmed with logic 1, GRPPWM and GRPFREQ registers
de?ne a global blinking pattern, where GRPFREQ contains the blinking period (from
24 Hz to 10.73 s) and GRPPWM the duty cycle (ON/OFF ratio in %).
GDC [ 7 : 0 ]
duty cycle = ---------------------------
256
7.3.5 GRPFREQ, group frequency
Table 9. GRPFREQ - Group Frequency register (address 13h) bit description
Legend: * default value.
(2)
Address
13h
Register
GRPFREQ
Bit
7:0
Symbol
GFRQ[7:0]
Access
R/W
Value
0000 0000*
Description
GRPFREQ register
GRPFREQ is used to program the global blinking period when DMBLNK bit (MODE2
register) is equal to 1. Value in this register is a ‘Don’t care’ when DMBLNK = 0.
Applicable to LED outputs programmed with LDRx = 11 (LEDOUT0 to LEDOUT3
registers).
Blinking period is controlled through 256 linear steps from 00h (41 ms, frequency 24 Hz)
to FFh (10.73 s).
global blinking period = ---------------------------------------- ( s )
PCA9625_2
GFRQ [ 7 : 0 ] + 1
24
(3)
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 15 January 2008
12 of 33
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