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MAX6946

更新时间： 2024-10-03 14:57:31
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亚德诺 - ADI 驱动驱动器
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24页 261K
描述
10端口、恒流LED驱动器和输入/输出扩展器，带有PWM亮度控制

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MAX6946 数据手册

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19-0598; Rev 3; 2/08  
10-Port, Constant-Current LED Driver and  
I/O Expander with PWM Intensity Control  
General Description  
Features  
The MAX6946/MAX6947 I C-/SMBusTM-compatible,  
serial-interfaced peripherals provide microprocessors  
with 10 I/O ports rated to 7V.  
2
♦ 2.25V to 3.6V Operation  
♦ I/O Ports Default to High Impedance (LEDs Off)  
on Power-Up  
♦ I/O Port Inputs Are Overvoltage Protected to 7V  
Each port can be configured as a 2.5mA to 20mA con-  
stant-current LED driver (static or PWM), a 1.25mA to  
10mA constant-current LED driver (static or PWM), an  
open-drain logic output, or an overvoltage-protected  
Schmitt logic input.  
♦ I/O Port Outputs Are 7V-Rated Open-Drain, 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  
Analog and switching LED intensity control includes indi-  
vidual 8-bit PWM control per output, individual 1-bit ana-  
log current control (half/full scale) per output, and a global  
3-bit DAC current control that applies to all LED outputs.  
♦ RST Input Clears Serial Interface and Can Exit  
Shutdown (Warm Start)  
♦ MAX6946 OSC Input Allows for External PWM  
Clock Input  
The MAX6946/MAX6947 can stagger the PWM timing of  
the 10-port outputs in consecutively phased 45° incre-  
ments. Staggering the outputs spreads the PWM load  
currents over time in eight steps, helping to even out  
the power-supply current and reduce the RMS current.  
♦ MAX6947 AD0 Input Selects from Two Slave  
Addresses  
♦ Auto Ramp-Up Out of Shutdown, and Up to 4s  
Hold-Off Before Ramp-Down into Shutdown  
For a similar part with an SPITM-/QSPITM-/ or MICROWIRETM-  
compatible interface, refer to the MAX6966/MAX6967  
data sheet.  
♦ 0.8µA (typ) Shutdown Current  
♦ -40°C to +125°C Temperature Range  
♦ Tiny WLP Package (4 x 4 Grid)  
Applications  
LCD Backlights  
Keypad Backlights  
LED Status Indicators  
Ordering Information  
Cellular Phones  
Portable Equipment  
RGB LED Drivers  
PKG  
CODE  
PART  
PIN-PACKAGE  
MAX6946ATE+  
MAX6946CAWE+  
MAX6947ATE+  
16 TQFN-EP*  
16 WLP  
T1633-4  
W162B2-1  
T1633-4  
Typical Operating Circuit  
16 TQFN-EP*  
+Denotes a lead-free package.  
*EP = Exposed pad.  
+3.3V  
V
= +5V  
EXT  
Note: All devices are specified over the -40°C to +125°C operating  
V
DD  
temperature range..  
μC  
P0  
P1  
P2  
P3  
P4  
P5  
P6  
P7  
P8  
P9  
Pin Configurations  
SCL  
SDA  
SCL  
SDA  
OSC*  
RST  
MAX6946  
MAX6947  
LOGIC INPUT  
LOGIC INPUT  
LOGIC INPUT  
LOGIC INPUT  
LOGIC INPUT  
LOGIC INPUT  
LOGIC INPUT  
TOP VIEW  
MAX6946C  
A1  
RST  
B1  
A2  
VDD  
B2  
A3  
SCL  
B3  
A4  
SDA  
B4  
AD0**  
GND  
*MAX6946 ONLY.  
**MAX6947 ONLY.  
P9  
P1  
OSC  
C2  
P0  
C1  
P8  
C3  
P3  
C4  
P2  
SMBus is a trademark of Intel Corp.  
SPI and QSPI are trademarks of Motorola, Inc.  
MICROWIRE is a trademark of National Semiconductor Corp.  
P7  
D1  
P6  
D2  
D3  
D4  
P4  
GND  
P5  
(BUMPS ON BOTTOM)  
16-BUMP, 2.1mm x 2.1mm WLP  
Pin Configurations continued at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
1234567...24

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