The LED1202 is a 12-channel low quiescent current LED driver; it guarantees 5 V output driving capability and each channel is able to provide up to 20 mA with a headroom voltage of 350 mV (typ.) only. The output current can be adjusted separately for each channel by 8-bit analog and 12-bit digital dimming control.
A slow turn-on and turn-off time improves the system low noise generation performance; moreover, the phase shifting function helps to reduce the inrush current. Eight patterns can be stored in the internal registers for automatic sequencing without MCU intervention.
The pattern sequence can be also configured for duration time and number of repetition. For multi-device applications, a common clock domain can be shared for timing synchronization. The device includes thermal shutdown and open LED detection.
The device I²C interface is based on fast mode specification and works up to 400 kHz. Eight I²C addresses are possible by using two configuration pins (A0/A1) only.
The LED1202 is available in WLCSP20 package 1.71 x 2.16 x 0.5 mm with 0.4 mm pitch and in QFN20 3x3 package 3 x 3 x 0.6 mm with 0.5 mm pitch.
LED1202主要特性:
Supply range from 2.6 V to 5 V
12 channels for single LED
20 mA current capability per channel
1% (typ.) current matching at 16 mA and 2% (typ.) at 2.5 mA
1.8 V compatible I²C control interface
8-bit analog dimming individual control
12-bit local PWM resolution
8 programmable patterns
Programmable pattern sequence
Synchronization for multi-device application
Phase shifting between channels
Open LED detection
Overtemperature protection
8 configurable I²C slave addresses plus global address
Fault flag pin
LED1202应用:
• RGB LED lighting, fade-in and fade-out breathing effect,indicator lights for:
– Wearable electronics
– Battery powered devices
– Portable accessories
图1.LED1202简化框图
图2.LED1202驱动器电路框图
图3.菊花链共通时钟域配置概述图
评估板STEVAL-LLL007V1
Evaluation kit for the LED1202 12-channel low quiescent current LED driver STMicroelectronics STEVAL-LLL007V1 Evaluation Kit is configured to evaluate the operation of the LED1202 driver. The STEVAL-LLL007V1 Evaluation Kit includes the STEVAL-LLL007M1 main board and the STEVAL-LLL007D1 and STEVAL-LLL007D2 panel boards. The main board connects to a NUCLEO-L073RZ development platform running the STSW-LLL007FW firmware. This firmware comes with pre-configured random and wave patterns for use in standalone mode.
Users are able to develop your own pattern sequences by connecting the Nucleo platform to a PC running a dedicated GUI program, giving access to all the LED driver settings. The STEVAL-LLL007D1 panel board and the STEVAL-LLL007D2 panel board connected with an external power source via the J13 connector on the STEVAL-LLL007M1 board achieves maximum luminosity.
评估板STEVAL-LLL007V1主要特性:
3x LED1202 12-channel low quiescent current LED drivers embedded on main board
Can immediately drive 36 white LEDs available on main board, to help you get started
Includes additional panel boards to let you expand your development:
1 with 36 white LEDs
1 with 12 RGB LEDs
Designed for use with NUCLEO-L073RZ development platform running the STSW-LLL007FW firmware
E5V connector to supply STM32 Nucleo board and additional panels
Supplied with a range of default patterns
GUI for advanced driver configuration and customized pattern generation
CE Certified
RoHS and China RoHS compliant
WEEE compliant (2012/19/UE RAEE II)
评估板STEVAL-LLL007V1包括:
STEVAL-LLL007M1 main board
STEVAL-LLL007D1 panel board with 36 white LEDS
STEVAL-LLL007D2 panel board with 12 RGB LEDS
图4.评估板STEVAL-LLL007V1外形图
图5.评估板STEVAL-LLL007V1电路图(1)
图6.评估板STEVAL-LLL007V1电路图(2)
图7.评估板STEVAL-LLL007V1电路图(3)
评估板STEVAL-LLL007M1材料清单:
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