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PDF PCA9632 Data sheet ( Hoja de datos )
| Número de pieza | PCA9632 | |
| Descripción | 4-bit Fm I2C-bus low power LED driver | |
| Fabricantes | NXP Semiconductors | |
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PCA9632
4-bit Fm+ I2C-bus low power LED driver
Rev. 01 — 28 September 2007
Objective data sheet
1. General description
The PCA9632 is an I2C-bus controlled 4-bit LED driver optimized for
Red/Green/Blue/Amber (RGBA) color mixing applications. The PCA9632 is a drop-in
upgrade for the PCA9633 with 40× power reduction. In individual brightness control mode,
each LED output has its own 8-bit resolution (256 steps) fixed frequency Individual PWM
controller that operates at 1.5625 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. In group dimming mode,
each LED output has its own 6-bit resolution (64 steps) fixed frequency Individual PWM
controller that operates at 6.25 kHz with a duty cycle that is adjustable from 0 % to 98.4 %
to allow the LED to be set to a specific brightness value. A fifth 4-bit resolution (16 steps)
Group PWM controller has a fixed frequency of 190 Hz that is used to dim all the LEDs
with the same value.
While operating in the Blink mode, each LED output has its own 8-bit resolution
(256 steps) fixed frequency individual PWM controller that operates at 1.5625 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. Blink rate is controlled by the Group Frequency setting that has 8-bit
resolution (256 steps). The blink rate is adjustable between 24 Hz to once every
10.73 seconds. For Group Frequency settings between 6 Hz and 24 Hz, the Group PWM
has a 6-bit resolution (64 steps) with a duty cycle that is adjustable from 0 % to 98.4 %.
For Group frequency settings between 6 Hz to 0.09 Hz (once in 10.73 seconds), the
Group PWM has an 8-bit resolution (256 steps) with a duty cycle that is adjustable from
0 % to 99.6 %.
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 PCA9632 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 PCA9632 is in the 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).
Software programmable LED Group and three Sub Call I2C addresses allow all or defined
groups of PCA9632 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.
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PCA9632
4-bit Fm+ I2C-bus low power LED driver
7. Functional description
Refer to Figure 1 “Block diagram of PCA9632”.
7.1 Device addresses
Following a START condition, the bus master must output the address of the slave it is
accessing.
7.1.1 Regular I2C-bus slave address
The I2C-bus slave address of the PCA9632 is shown in Figure 4.
slave address
1 1 0 0 0 1 0 R/W
fixed
002aab318
Fig 4. Slave address
The last bit of the address byte defines the operation to be performed. When set to logic 1
a read is selected, while a logic 0 selects a write operation.
7.1.2 LED All Call I2C-bus address
• Default power-up value (ALLCALLADR register): E0h or 1110 000
• Programmable through I2C-bus (volatile programming)
• At power-up, LED All Call I2C-bus address is enabled. PCA9632 sends an ACK when
E0h (R/W = 0) or E1h (R/W = 1) is sent by the master.
See Section 7.3.8 “LED All Call I2C-bus address, ALLCALLADR” for more detail.
Remark: The default LED All Call I2C-bus address (E0h or 1110 000) must not be used
as a regular I2C-bus slave address since this address is enabled at power-up. All the
PCA9632s on the I2C-bus will acknowledge the address if sent by the I2C-bus master.
7.1.3 LED Sub Call I2C-bus addresses
• 3 different I2C-bus addresses can be used
• Default power-up values:
– SUBADR1 register: E2h or 1110 001
– SUBADR2 register: E4h or 1110 010
– SUBADR3 register: E8h or 1110 100
• Programmable through I2C-bus (volatile programming)
• At power-up, Sub Call I2C-bus addresses are disabled. PCA9632 does not send an
ACK when E2h (R/W = 0) or E3h (R/W = 1), E4h (R/W = 0) or E5h (R/W = 1), or
E8h (R/W = 0) or E9h (R/W = 1) is sent by the master.
See Section 7.3.7 “I2C-bus subaddress 1 to 3, SUBADRx” for more detail.
PCA9632_1
Objective data sheet
Rev. 01 — 28 September 2007
© NXP B.V. 2007. All rights reserved.
5 of 32
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PCA9632
4-bit Fm+ I2C-bus low power LED driver
E.g., If GDC[7:0] = 1111 1111, then duty cycle = 255 / 256 = 99.6 %.
Applicable to LED outputs programmed with LDRx = 11 (LEDOUT register).
7.3.5 Group frequency, GRPFREQ
Table 9. GRPFREQ - Group Frequency register (address 07h) bit description
Legend: * default value.
Address Register Bit Symbol Access Value
Description
07h GRPFREQ 7:0 GFRQ[7:0] R/W 0000 0000* 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 (LEDOUT register).
Blinking period is controlled through 256 linear steps from 00h (41 ms, frequency 24 Hz)
to FFh (10.73 seconds).
global blinking period = G-----F----R----Q----2-[--74----:--0---]----+----1-- (in seconds)
(7)
7.3.6 LED driver output state, LEDOUT
Table 10. LEDOUT - LED driver output state register (address 08h) bit description
Legend: * default value.
Address Register Bit Symbol Access Value
Description
08h LEDOUT 7:6 LDR3 R/W 00*
LED3 output state control
5:4 LDR2
R/W 00*
LED2 output state control
3:2 LDR1
R/W 00*
LED1 output state control
1:0 LDR0
R/W 00*
LED0 output state control
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.
7.3.7 I2C-bus subaddress 1 to 3, SUBADRx
Table 11. SUBADR1 to SUBADR3 - I2C-bus subaddress registers 0 to 3 (address 09h to
0Bh) bit description
Legend: * default value.
Address Register
Bit Symbol Access Value
Description
09h SUBADR1 7:1 A1[7:1] R/W 1110 001* I2C-bus subaddress 1
0 A1[0]
R only 0*
reserved
0Ah SUBADR2 7:1 A2[7:1] R/W 1110 010* I2C-bus subaddress 2
0 A2[0]
R only 0*
reserved
0Bh SUBADR3 7:1 A3[7:1] R/W 1110 100* I2C-bus subaddress 3
0 A3[0]
R only 0*
reserved
PCA9632_1
Objective data sheet
Rev. 01 — 28 September 2007
© NXP B.V. 2007. All rights reserved.
11 of 32
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet PCA9632.PDF ] | |
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