pca9532bs NXP Semiconductors, pca9532bs Datasheet - Page 2

• Manufacturer Part Number: pca9532bs
• Description: 16-bit I2c Led Dimmer
• Manufacturer: NXP Semiconductors

FEATURES
ORDERING INFORMATION
Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging.
I
2
Philips Semiconductors
2004 Oct 01
C is a trademark of Philips Semiconductors Corporation.
16 LED drivers (on, off, flashing at a programmable rate)
2 selectable, fully programmable blink rates (frequency and duty
cycle) between 0.591 and 152 Hz (1.69 seconds and
6.58 milliseconds)
256 brightness steps
Input/outputs not used as LED drivers can be used as regular
GPIOs
Internal oscillator requires no external components
I
Internal power-on reset
Noise filter on SCL/SDA inputs
Active-LOW reset input
16 open drain outputs directly drive LEDs to 25 mA
Controlled edge rates to minimize ground bounce
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 kHz 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
Packages offered: SO24, TSSOP24, HVQFN24
16-bit I
2
24-pin plastic HVQFN
24-pin plastic TSSOP
C-bus interface logic compatible with SMBus
24-pin plastic SO
PACKAGES
2
C LED dimmer
TEMPERATURE RANGE
–40 C to +85 C
–40 C to +85 C
–40 C to +85 C
ORDER CODE
PCA9532PW
PCA9532BS
PCA9532D
2
DESCRIPTION
The PCA9532 is a 16-bit I
optimized for dimming LEDs in 256 discrete steps for
Red/Green/Blue (RGB) color mixing and back light applications.
The PCA9532 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 cannot 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 set-up 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
1.69 seconds. The open drain outputs directly drive the LEDs with
maximum output sink current of 25 mA per bit and 200 mA per
package (100 mA per octal).
To blink LEDs at periods greater than 1.69 seconds 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 PCF8575 or PCA9555. 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,
pushbuttons, alarm monitoring, fans, etc.
The active-LOW hardware reset pin (RESET) and Power-On Reset
(POR) initializes the registers to their default state, all zeroes,
causing the bits to be set HIGH (LED off).
Three hardware address pins on the PCA9532 allow eight devices
to operate on the same bus.
TOPSIDE MARK
PCA9532D
PCA9532
9532
2
C-bus and SMBus I/O expander
DRAWING NUMBER
Product data sheet
PCA9532
SOT137-1
SOT355-1
SOT616-1