http://www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf


NXP
NXP

9531 Datasheet

8-bit I2C LED dimmer


9531 Datasheet Preview


INTEGRATED CIRCUITS
PCA9531
8-bit I2C LED dimmer
Product data
Philips
Semiconductors
2003 Nov 10
Page 1

Philips Semiconductors
8-bit I2C LED dimmer
Product data
PCA9531
FEATURES
Eight LED drivers (on, off, flashing at a programmable rate)
Two selectable, fully programmable blink rates (frequency and
duty cycle) between 0.625 and 160 Hz (1.6 and 6.25 milliseconds)
256 brightness steps
Input/outputs not used as LED drivers can be used as regular
GPIOs
Internal oscillator requires no external components
I2C interface logic compatible with SMBus
Internal power-on reset
Noise filter on SCL/SDA inputs
Active low reset input
Eight open drain outputs directly drive LEDs to 25 mA
Edge rate control on outputs
No glitch on power-up
Supports hot insertion
Low stand-by current
Operating power supply voltage range of 2.3 V to 5.5 V
0 to 400 kHz clock frequency
ESD protection exceeds 2000 V HBM per JESD22-A114,
150 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
Latch-up testing is done to JEDEC Standard JESD78 which
exceeds 100 mA
Package offer: SO16, TSSOP16, HVQFN16
DESCRIPTION
The PCA9531 is an 8-bit I2C & SMBus I/O expander optimized for
dimming LEDs in 256 discrete steps for Red/Green/Blue (RGB)
color mixing and back light applications.
The PCA9531 contains an internal oscillator with two user
programmable blink rates and duty cycles coupled to the output
PWM. The LED brightness is controlled by setting the blink rate high
enough (> 100 Hz) that the blinking can not be seen and then using
the duty cycle to vary the amount of time the LED is on and thus the
average current through the LED.
The initial setup sequence programs the two blink rates/duty cycles
for each individual PWM. From then on, only one command from the
bus master is required to turn individual LEDs ON, OFF, BLINK
RATE 1 or BLINK RATE 2. Based on the programmed frequency
and duty cycle, BLINK RATE 1 and BLINK RATE 2 will cause the
LEDs to appear at a different brightness or blink at periods up to 1.6
second. The open drain outputs directly drive the LEDs with
maximum output sink current of 25 mA per bit and 100 mA per
package.
To blink LEDs at periods greater than 1.6 second the bus master
(MCU, MPU, DSP, chipset, etc.) must send repeated commands to
turn the LED on and off as is currently done when using normal I/O
Expanders like the Philips PCF8574 or PCA9554. Any bits not used
for controlling the LEDs can be used for General Purpose Parallel
Input/Output (GPIO) expansion which provides a simple solution
when additional I/O is needed for ACPI power switches, sensors,
push-buttons, alarm monitoring, fans, etc.
The active low hardware reset pin (RESET) and Power On Reset
(POR) initializes the registers to their default state causing the bits
to be set high (LED off).
Three hardware address pins on the PCA9531 allow eight devices
to operate on the same bus.
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
ORDER CODE
TOPSIDE MARK
16-pin plastic SO
-40 to +85 °C
PCA9531D
PCA9531D
16-pin plastic TSSOP
-40 to +85 °C
PCA9531PW
PCA9531
16-pin plastic HVQFN
-40 to +85 °C
PCA9531BS
9531
Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging.
I2C is a trademark of Philips Semiconductors Corporation.
DRAWING NUMBER
SOT109-1
SOT403-1
SOT629-1
2003 Nov 10
2
Page 2

Philips Semiconductors
8-bit I2C LED dimmer
Product data
PCA9531
PIN CONFIGURATION — SO, TSSOP
PIN CONFIGURATION — HVQFN
A0 1
A1 2
A2 3
LED0 4
LED1 5
LED2 6
LED3 7
VSS 8
16 VDD
15 SDA
14 SCL
13 RESET
12 LED7
11 LED6
10 LED5
9 LED4
SW02039
Figure 1. Pin configuration — SO, TSSOP
PIN DESCRIPTION
SO, TSSOP
PIN
NUMBER
HVQFN
PIN
NUMBER
1 15
2 16
31
4, 5, 6, 7
2, 3, 4, 5
86
9, 10, 11, 12 7, 8, 9, 10
13 11
14 12
15 13
16 14
SYMBOL
A0
A1
A2
LED0-3
VSS
LED4-7
RESET
SCL
SDA
VDD
A1 A0 VDD SDA
A2 1
LED0 2
LED1 3
LED2 4
12 SCL
11 RESET
10 LED7
9 LED6
LED3 VSS LED4 LED5
TOP VIEW
su01667
Figure 2. Pin configuration — HVQFN
FUNCTION
Address input 0
Address input 1
Address input 2
LED drivers 0-3
Supply ground
LED drivers 4-7
Active low reset input
Serial clock line
Serial data line
Supply voltage
2003 Nov 10
3
Page 3

Philips Semiconductors
8-bit I2C LED dimmer
Product data
PCA9531
BLOCK DIAGRAM
PCA9531
SCL
SDA
INPUT
FILTERS
A2 A1 A0
I2C-BUS
CONTROL
INPUT
REGISTER
LED SELECT (LSx)
REGISTER
VDD
RESET
VSS
POWER-ON
RESET
OSCILLATOR
PRESCALER 0
REGISTER
PRESCALER 1
REGISTER
0
1
PWM0
REGISTER
PWM1
REGISTER
BLINK0
BLINK1
NOTE: ONLY ONE I/O SHOWN FOR CLARITY
Figure 3. Block diagram
LEDx
SW02040
2003 Nov 10
4
Page 4
Part Number 9531
Manufactur NXP
Description 8-bit I2C LED dimmer
Total Page 20 Pages
PDF Download
9531 datasheet
Download PDF File
9531 datasheet
View Html for PC & Mobile


Related Datasheet

9531 , 9534 , 9535 , 9536XL ,

site map

webmaste! click here

contact us

Buy Components