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PCA9622DR Datasheet(PDF) 13 Page - NXP Semiconductors |
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PCA9622DR Datasheet(HTML) 13 Page - NXP Semiconductors |
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13 / 39 page  PCA9622_3 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 03 — 31 August 2009 13 of 39 NXP Semiconductors PCA9622 16-bit Fm+ I2C-bus 100 mA 40 V LED driver 7.3.4 GRPPWM, group duty cycle control 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 %). (2) 7.3.5 GRPFREQ, group frequency 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). (3) Table 8. GRPPWM - Group brightness control register (address 12h) bit description Legend: * default value Address Register Bit Symbol Access Value Description 12h GRPPWM 7:0 GDC[7:0] R/W 1111 1111 GRPPWM register duty cycle GDC 7:0 [] 256 --------------------------- = Table 9. GRPFREQ - Group Frequency register (address 13h) bit description Legend: * default value. Address Register Bit Symbol Access Value Description 13h GRPFREQ 7:0 GFRQ[7:0] R/W 0000 0000* GRPFREQ register global blinking period GFRQ 7:0 [] 1 + 24 ---------------------------------------- s () = |
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