pca9633 NXP Semiconductors, pca9633 Datasheet - Page 14

• Manufacturer Part Number: pca9633
• Description: Pca9633 4-bit Fm+ I2c-bus Led Driver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9633_3
Product data sheet
7.3.5 Group frequency, GRPFREQ
7.3.6 LED driver output state, LEDOUT
When DMBLNK bit is programmed with 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 12.
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 (LEDOUT register).
Blinking period is controlled through 256 linear steps from 00h (41 ms, frequency 24 Hz)
to FFh (10.73 s).
Table 13.
Legend: * default value.
LDRx = 00 — LED driver x is off (default power-up state).
LDRx = 01 — LED driver x is fully on (individual brightness and group dimming/blinking
not controlled).
LDRx = 10 — LED driver x individual brightness can be controlled through its PWMx
register.
LDRx = 11 — LED driver x individual brightness and group dimming/blinking can be
controlled through its PWMx register and the GRPPWM registers.
duty cycle
global blinking period
Address
07h
Address
08h
GRPFREQ - Group Frequency register (address 07h) bit description
Register
GRPFREQ
LEDOUT - LED driver output state register (address 08h) bit description
Register
LEDOUT
=
GDC 7:0
-------------------------- -
256
Rev. 03 — 20 December 2006
Bit
7:0
Bit
7:6
5:4
3:2
1:0
=
GFRQ 7:0
--------------------------------------- -
Symbol
GFRQ[7:0]
Symbol
LDR3
LDR2
LDR1
LDR0
24
+
1
Access Value
R/W
Access Value
R/W
R/W
R/W
R/W
(in seconds)
0000 0000* GRPFREQ register
00*
00*
00*
00*
4-bit Fm+ I
Description
Description
LED3 output state control
LED2 output state control
LED1 output state control
LED0 output state control
PCA9633
2
© NXP B.V. 2006. All rights reserved.
C-bus LED driver
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