STLED316SMTR STMicroelectronics

STLED316S Serial-interfaced 6-digit LED controller with keyscan Features LED driver with 14 outputs (8 segments/6 digits) 40 mA load current capability for each segment Output pins connected directly to the LEDs or can be open-drain SO-24 Key-scanning (8 x 2 matrix) Low power consumption in standby mode 3-wire serial bus interface (CLK, STB, DIN/DOUT) 8-step dimming circuit to control the overall Description display brightness The STLED316S is a compact LED controller and Single external resistor for output current driver that interface microprocessors to LED setting displays through a serial 3-wire interface. It drives Inputs with Schmitt trigger give superior noise LED connected in common anode configuration. immunity The STLED316S drives up to 48 discrete LEDs in 8 segment/6 digit configuration while functioning A single LED digit output (DIG1 LED) can be from a supply voltage of 5.0V. Additionally it can used to drive up to 8 discrete LEDs be used to drive 8 discrete LEDs which form a 8-step dimming circuit to control brightness of part of LED digit. The individual LEDs are wired individual LEDs for LED digit as segments of a digit and brightness of these 5.0 V ( 10%) for V CC individual LEDs can be controlled digitally. The maximum segment current for the display digits is Drives common-anode LED digits set through a single external resistor. Individual Built-in power on reset and soft-start circuits digits may be addressed and updated without re- Available in SO24 package writing the entire display. -40 C to 85 C operating temperature range Additionally it includes key scanning for an 8x2 key matrix which automatically scans a matrix of up to 16 switches. STLED316S supports numeric- Applications type displays and reduces the overall BOM costs Set-top-boxes through high integration. Also it provides ESD protection of greater than 4 kV HBM. White goods Home appliances The LED controller/driver is ideal as a peripheral device to interface the display with a singlechip DVD players and VCRs microcomputer. Table 1. Device summary Part number Package Packaging STLED316SMTR SO-24 Tape and reel January 2008 Rev 1 1/33 www.st.com 33Contents STLED316S Contents 1 STLED316S functional and application diagram 3 2 Pin description . 5 3 STLED316S functional description . 7 3.1 Low power mode of operation 7 3.2 Serial interface 7 3.3 Initial power up 7 3.4 Display types . 8 3.5 Keyscan . 8 3.6 Discrete LED outputs . 8 3.7 Power on reset and soft-start . 8 3.8 LED drivers . 9 3.9 Interrupt . 9 3.10 Operating the device with 3.3 V interface voltages 9 4 Maximum rating 10 4.1 Thermal data 10 5 Recommended operating conditions 11 5.1 DC electrical characteristics . 11 5.2 Power consumption estimation . 12 5.3 Capacitance . 12 5.4 Power supply characteristics 12 5.5 Dynamic switching characteristics 13 5.6 Timing characteristics . 13 5.7 ESD performance . 13 6 Key-scan & display cycle 14 7 Key matrix and key-input data storage ram . 15 8 Commands 16 2/33