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PDF PCA9634 Data sheet ( Hoja de datos )
| Número de pieza | PCA9634 | |
| Descripción | 8-bit Fm I2C-bus LED driver | |
| Fabricantes | NXP Semiconductors | |
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PCA9634
8-bit Fm+ I2C-bus LED driver
Rev. 06 — 12 September 2008
Product data sheet
1. General description
The PCA9634 is an I2C-bus controlled 8-bit LED driver optimized for
Red/Green/Blue/Amber (RGBA) color mixing applications. Each LED output has its own
8-bit resolution (256 steps) fixed frequency Individual PWM controller that operates at
97 kHz with a duty cycle that is adjustable from 0 % to 99.6 % to allow the LED to be set
to a specific brightness value. An additional 8-bit resolution (256 steps) Group PWM
controller has both a fixed frequency of 190 Hz and an adjustable frequency between
24 Hz to once every 10.73 seconds with a duty cycle that is adjustable from 0 % to 99.6 %
that is used to either dim or blink all LEDs with the same value.
Each LED output can be off, on (no PWM control), set at its Individual PWM controller
value or at both Individual and Group PWM controller values. The LED output driver is
programmed to be either open-drain with a 25 mA current sink capability at 5 V or
totem-pole with a 25 mA sink, 10 mA source capability at 5 V. The PCA9634 operates with
a supply voltage range of 2.3 V to 5.5 V and the outputs are 5.5 V tolerant. LEDs can be
directly connected to the LED output (up to 25 mA, 5.5 V) or controlled with external
drivers and a minimum amount of discrete components for larger current or higher voltage
LEDs.
The PCA9634 is one of the first LED controller devices in a new Fast-mode Plus (Fm+)
family. Fm+ devices offer higher frequency (up to 1 MHz) and more densely populated bus
operation (up to 4000 pF).
The active LOW Output Enable input pin (OE) allows asynchronous control of the LED
outputs and can be used to set all the outputs to a defined I2C-bus programmable logic
state. The OE can also be used to externally PWM the outputs, which is useful when
multiple devices need to be dimmed or blinked together using software control.
Software programmable LED Group and three Sub Call I2C-bus addresses allow all or
defined groups of PCA9634 devices to respond to a common I2C-bus address, allowing
for example, all red LEDs to be turned on or off at the same time or marquee chasing
effect, thus minimizing I2C-bus commands. Seven hardware address pins allow up to
126 devices on the same bus.
The Software Reset (SWRST) Call allows the master to perform a reset of the PCA9634
through the I2C-bus, identical to the Power-On Reset (POR) that initializes the registers to
their default state causing the outputs to be set HIGH (LED off). This allows an easy and
quick way to reconfigure all device registers to the same condition.
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6. Pinning information
6.1 Pinning
PCA9634
8-bit Fm+ I2C-bus LED driver
A0 1
A1 2
A2 3
A3 4
A4 5
LED0 6
LED1 7
LED2 8
LED3 9
VSS 10
PCA9634D
20 VDD
19 SDA
18 SCL
17 A6
16 A5
15 OE
14 LED7
13 LED6
12 LED5
11 LED4
002aac131
Fig 2. Pin configuration for SO20
A0 1
A1 2
A2 3
A3 4
A4 5
LED0 6
LED1 7
LED2 8
LED3 9
VSS 10
PCA9634PW
20 VDD
19 SDA
18 SCL
17 A6
16 A5
15 OE
14 LED7
13 LED6
12 LED5
11 LED4
002aac132
Fig 3. Pin configuration for TSSOP20
terminal 1
index area
A2 1
A3 2
A4 3
LED0 4
LED1 5
PCA9634BS
15 A6
14 A5
13 OE
12 LED7
11 LED6
Transparent top view
Fig 4. Pin configuration for HVQFN20
002aac133
PCA9634_6
Product data sheet
Rev. 06 — 12 September 2008
© NXP B.V. 2008. All rights reserved.
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PCA9634
8-bit Fm+ I2C-bus LED driver
7.3.1 Mode register 1, MODE1
Table 5. MODE1 - Mode register 1 (address 00h) bit description
Legend: * default value.
Bit Symbol
Access
Value Description
7 AI2
read only
0
register Auto-Increment disabled
1* register Auto-Increment enabled
6 AI1
read only
0*
Auto-Increment bit 1 = 0
1 Auto-Increment bit 1 = 1
5 AI0
read only
0*
Auto-Increment bit 0 = 0
1 Auto-Increment bit 0 = 1
4 SLEEP R/W
0 Normal mode[1]
1* Low power mode; oscillator off[2]
3 SUB1
R/W
0* PCA9634 does not respond to I2C-bus subaddress 1
1 PCA9634 responds to I2C-bus subaddress 1
2 SUB2
R/W
0* PCA9634 does not respond to I2C-bus subaddress 2
1 PCA9634 responds to I2C-bus subaddress 2
1 SUB3
R/W
0* PCA9634 does not respond to I2C-bus subaddress 3
1 PCA9634 responds to I2C-bus subaddress 3
0
ALLCALL
R/W
0 PCA9634 does not respond to LED All Call I2C-bus address
1* PCA9634 responds to LED All Call I2C-bus address
[1] It takes 500 µs max. for the oscillator to be up and running once SLEEP bit has been set to logic 0. Timings on LEDn outputs are not
guaranteed if PWMx, GRPPWM or GRPFREQ registers are accessed within the 500 µs window.
[2] When the oscillator is off (Sleep mode) the LED outputs cannot be turned on, off or dimmed/blinked.
7.3.2 Mode register 2, MODE2
Table 6. MODE2 - Mode register 2 (address 01h) bit description
Legend: * default value.
Bit Symbol
Access Value Description
7-
read only 0*
reserved
6-
read only 0*
reserved
5
DMBLNK
R/W
0* Group control = dimming
1 Group control = blinking
4 INVRT[1] R/W
0* output logic state not inverted; value to use when no external driver used;
applicable when OE = 0
1 output logic state inverted; value to use when external driver used;
applicable when OE = 0
3 OCH
R/W
0* outputs change on STOP command[2]
1 outputs change on ACK
2 OUTDRV[1] R/W
0 the 8 LED outputs are configured with an open-drain structure
1* the 8 LED outputs are configured with a totem-pole structure
PCA9634_6
Product data sheet
Rev. 06 — 12 September 2008
© NXP B.V. 2008. All rights reserved.
11 of 38
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet PCA9634.PDF ] | |
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