pca9622 NXP Semiconductors, pca9622 Datasheet - Page 13

• Manufacturer Part Number: pca9622
• Description: 16-bit Fm+ I2c-bus 100 Ma 40 V Led Driver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9622_1
Product data sheet
7.3.4 GRPPWM, group duty cycle control
7.3.5 GRPFREQ, group frequency
Table 8.
Legend: * default value
When DMBLNK bit (MODE2 register) is programmed with logic 0, a 190 Hz fixed
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
define 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 %).
Table 9.
Legend: * default value.
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).
duty cycle
global blinking period
Address
12h
Address
13h
GRPPWM - Group brightness control register (address 12h) bit description
Register
GRPPWM
GRPFREQ - Group Frequency register (address 13h) bit description
Register
GRPFREQ
=
GDC 7:0
-------------------------- -
256
Rev. 01 — 27 March 2009
Bit
7:0
Bit
7:0
=
GFRQ 7:0
--------------------------------------- - s
Symbol
GDC[7:0]
Symbol
GFRQ[7:0]
24
+
1
Access Value
R/W
Access Value
R/W
16-bit Fm+ I
1111 1111
0000 0000* GRPFREQ register
2
C-bus 100 mA 40 V LED driver
Description
GRPPWM register
Description
PCA9622
© NXP B.V. 2009. All rights reserved.
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