MAX6966 Datasheet, PDF (1/29 Pages) Maxim Integrated Products – 10-Port Constant-Current LED Drivers and I/O Expanders with PWM Intensity Control

19-3487; Rev 2; 4/05
10-Port Constant-Current LED Drivers and I/O
Expanders with PWM Intensity Control
General Description
The MAX6966/MAX6967 serial-interfaced peripherals
provide microprocessors with 10 I/O ports rated to 7V.
Each port can be individually configured as either:
• A 20mA constant-current LED driver (static or pulse-
width modulated (PWM)).
• A 10mA constant-current LED driver (static or PWM).
• An open-drain logic output.
• An overvoltage-protected Schmitt logic input.
Analog and switching LED intensity control is built in:
• Individual 8-bit PWM control per output.
• Individual 1-bit analog control (half/full) per output.
• Global 3-bit analog control applies to all LED outputs.
PWM timing of the 10 port outputs may be optionally
staggered, consecutively phased in 45° increments.
This spreads the PWM load currents over time in eight
steps, helping to even out the power-supply current
and reduce the RMS current.
The MAX6966/MAX6967 can be configured to awake
from shutdown on receipt of a minimum 3ms pulse on
the CS input. This hardware-wakeup feature allows a
power-management controller or similar ASIC to enable
the MAX6966/MAX6967 with preconfigured LED intensi-
ty settings.
Shutdown can be programmed to wait up to 4s, fade
down the sink currents to zero for a period of 1/16s to
4s, and then shut down. A similar ramp-up from shut-
down can be programmed for 1/16s to 4s.
The MAX6966/MAX6967 support hot insertion. All port
pins remain high impedance in power-down (V+ = 0V)
with up to 8V asserted on them.
The DOUT/OSC pin can be configured as either the
serial interface data output or optional PWM clock
input. The MAX6966 powers up defaulting as DOUT
output. The MAX6967 defaults as OSC input.
For a similar part without the constant-current controls,
refer to the MAX7317 data sheet.
Applications
LCD Backlights
RGB LED Drivers
Keypad Backlights
Portable Equipment
LED Status Indication Cellular Phones
Features
♦ High-Speed 26MHz SPI-™/QSPI-™/MICROWIRE™-
Compatible Serial Interface
♦ 2.25V to 3.6V Operation
♦ I/O Ports Default to High-Z (LEDs Off) on Power-Up
♦ I/O Port Inputs Are Overvoltage Protected to 7V
♦ I/O Port Outputs Are 7V-Rated Open Drain
♦ I/O Port Outputs Are 10mA or 20mA Constant-
Current Static/PWM LED Drivers, or Open-Drain
Logic Outputs
♦ I/O Ports Support Hot Insertion
♦ Individual 8-Bit PWM Intensity Control for Each LED
♦ Any Output May Use or Not Use PWM Control
♦ Exit Shutdown (Warm Start) with Simple CS Pulse
♦ Auto Ramp-Down into Shutdown
♦ Auto Ramp-Up Out from Shutdown
♦ 0.8µA (typ), 2µA (max) Shutdown Current
♦ Tiny 3mm x 3mm, 0.8mm High Thin QFN Package
♦ -40°C to +125°C Temperature Range
Ordering Information
PART
TEMP PIN-
RANGE PACKAGE
TOP PKG
MARK CODE
MAX6966ATE
-40°C to
+125°C
MAX6966AEE
-40°C to
+125°C
MAX6967ATE
-40°C to
+125°C
16 Thin QFN
3mm x 3mm x
0.8mm
16 QSOP
16 Thin QFN
3mm x 3mm x
0.8mm
ACF
—
ACG
T1633-4
—
T1633-4
MAX6967AEE
-40°C to
+125°C
16 QSOP
—
—
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.