M1355

MOSDESIGN SEMICONDUCTOR CORP. 3-CHANNEL RGB LED LAMP DRIVER LED DRIVER M1355 GENERAL DESCRIPTION The M1355 is a 3-channel PWM enabled current sink driver for RGB LED or display applications. M1355 includes a serial buffer and data latches which convert serial input data into parallel output format, and built-in oscillator for PWM functioning. Data and clock buffer outputs are designed for cascading another chip. It is easy to be designed in applications that need mixing RGB light sources for multi-color output. The output current is determined by an external resistor and the brightness control code, both set by users. FEATURES ‧ CMOS technology. ‧ 3 output channels for RGB LED lamps. ‧ Output current invariant to load voltage change. ‧ 8-bits luminance data with PWM current output. ‧ Built-in buffers for cascading clock, CK, SDA,STB to other devices. APPLICATIONS ‧ LED Decorative Lighting. ‧ PWM Signal Generator. ‧ Keypad backlighting BLOCK DIAGRAM OUT1 (BLUE) OUT2 (GREEN) OUT3 (RED) REXT LATI CLKI SDAI Current Setting Output Driver Oscillator & Counter 8 8-bit Comparator 8 8-bit Latch 8 (MSB) Output Driver 8 8-bit Comparator 8 8-bit Latch 8 24-bit shift register Output Driver 8 8-bit Comparator 8 8-bit Latch 8 (LSB) LATO CLKO SDAO 1/6 2009-12-17 MOSDESIGN SEMICONDUCTOR CORP. 3-CHANNEL RGB LED LAMP DRIVER LED DRIVER M1355 PIN ASSIGNMENT M1355 N.C REXT LATI 1 14 VDD N.C LATO SDAI CLKI VSS SDAO CLKO OUT3 OUT1 7 8 OUT2 PIN DESCRIPTION NO. 1 , 13 2...