AS1116 64 LED Driver with Detailed Error Detection 1 General Description 2 Key Features 10MHz SPI-Compatible Interface The AS1116 is a compact LED driver for 64 single LEDs or 8 digits of 7-segments. The devices can be programmed via an SPI compatible Open and Shorted LED Error Detection 3-wire interface. - Global or Individual Error Detection Hexadecimal- or BCD-Code for 7-Segment Displays Every segment can be individually addressed and updated sepa- 200nA Low-Power Shutdown Current (typ data retained) rately. Only one external resistor (RSET) is required to set the cur- Individual Digit Brightness Control rent. LED brightness can be controlled by analog or digital means. Digital and Analog Brightness Control The devices include an integrated BCD code-B/HEX decoder, multi- Display Blanked on Power-Up plex scan circuitry, segment and display drivers, and a 64-bit mem- Drive Common-Cathode LED Displays ory. Internal memory stores the shift register settings, eliminating the Supply Voltage Range: 2.7 to 5.5V need for continuous device reprogramming. Software Reset Additionally the AS1116 offers a diagnostic mode for easy and fast Optional External Clock production testing and allows the use of the AS1116 for critical appli- Package: cations. The diagnostic allows to detect individual open or shorted - QSOP-24 and TQFN(4x4)-24 LEDs. The AS1116 features a low shutdown current of typically 200nA, and 3 Applications an operational current of typically 350A. The number of digits can be programmed, the devices can be reset by software, and an exter- The AS1116 is ideal for seven-segment or dot matrix displays in pub- nal clock is also supported. lic information displays at subway, train or bus stations, at airports The device is available in a QSOP-24 and TQFN(4x4)-24 package. and also at displays in public transportation like buses or trains mobile phones, personal electronic and toys. Figure 1. AS1116 - Typical Application Diagram 8 SEGA to G, DIG0 to SEG DP DIG7 VDD 8 8 8 8 2.7V to 5.5V 9.53k GND ISET AS1116 AS1116 AS1116 SDO SDO SDO SDI SDI SDI I/O LD LD LD SCL SCL SCL I/O P I/O I/O Diagnostic readback: open & shorted LEDs www.ams.com/LED-Driver-IC2/AS1116 Revision 1.09 1 - 23AS1116 Datasheet - P in o ut 4 Pinout Pin Assignments Figure 2. Pin Assignments (Top View) 24 23 22 21 20 19 1 18 DIG2 SEG E DIG3 2 17 SEGC GND 3 16 VDD AS1116 AS1116 DIG4 4 15 SEGG DIG5 5 14 SEGB N/C 6 13 SEGF 7 8 9 10 11 12 Pin Descriptions Table 1. Pin Descriptions Pin Name QSOP-24 TQFN(4x4)-24 Description Serial-Data Input. Data is loaded into the internal 16-bit shift register on the rising edge 1 22 SDI of pin SCL. 1, 2, 4, 5, 7, 8, 23, 2-5, 7-10 Digit Drive Lines. Eight digit drive lines that sink current from the display cathode. DIG0:DIG7 24 6 3 Ground. GND Load. Serial Data is loaded into the shift register while this pin is low. The last 16 bits of 11 9 LD serial data are latched on the rising edge of this pin. 12 6 Not Connected. N/C Set Segment Current. Connect to VDD or a reference voltage through RSET to set the ISET 13 10 peak segment current (see Selecting RSET Resistor Value and Using External Drivers on page 17). Serial-Clock Input. 10MHz maximum rate. Data is shifted into the internal shift register SCL 14 11 on the rising edge of this pin. Data is clocked out of pin SDO on the rising edge of this pin. Seven Segment and Decimal Point Drive Lines. 8 seven-segment drives and SEGA:SEGG, 15-18, 12-15, SEGDP 20-23 17-20 decimal point drive that source current to the display. 19 16 Positive Supply Voltage. Connect to +2.7 to +5.5V supply. VDD Serial-Data Output. The data into pin SDI is valid at pin SDO 16 clock cycles later. This SDO 24 21 pin is used to daisy-chain several devices and is never high-impedance. Exposed Pad. This pin also functions as a heat sink. Solder it to a large pad or to the - Exposed Pad circuit-board ground plane to maximize power dissipation. www.ams.com/LED-Driver-IC2/AS1116 Revision 1.09 2 - 23 SDI SDO 1 24 DIG0 SEGD 2 23 DIG1 SEGDP 3 22 DIG2 SEG E 4 21 DIG3 SEGC 5 20 GND 6 19 VDD DIG4 7 18 SEGG DIG5 8 17 SEGB DIG6 9 16 SEGF DIG7 10 15 SEGA 11 14 LD SCL N/C 12 13 ISET DIG6 DIG1 DIG7 DIG0 LD SDI ISET SDO SCL SEGD SEGA SEGDP