austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com Datasheet AS1117 64 LED Driver for Mobile Applications with Error Detection 1 General Description 2 Key Features 3.4MHz IC-Compatible Interface The AS1117 is a compact LED driver for 64 single LEDs or 8 digits of 7-segments. The devices can be pro- Individual LED Segment Control grammed via an IC compatible 2-wire interface. Every Readback for 8 Keys plus Interrupt segment can be individually addressed and updated Open and Shorted LED Error Detection separately. Only one external resistor (RSET) is required - Global or Individual Error Detection to set the current. LED brightness can be controlled by Hexadecimal- or BCD-Code for 7-Segment Displays analog or digital means. 200nA Low-Power Shutdown Current (typ data The devices include an integrated BCD code-B/HEX retained) decoder, multiplex scan circuitry, segment and display Digital and Analog Brightness Control drivers, and a 64-bit memory. Internal memory stores the shift register settings, eliminating the need for contin- Display Blanked on Power-Up uous device reprogramming. Drive Common-Cathode LED Displays Table 1. Available Products Supply Voltage Range: 2.7V to 5.5V Software and Hardware Reset Devices RESET Input Interfaces Up to 4 devices cascadable AS1115 no IC Optional External Clock AS1116 no SPI Package: TQFN(4x4)-24 AS1117 yes IC AS1118 yes SPI 3 Applications Additionally the AS1117 offers a detailed error diagnostic mode for easy and fast production testing in critical The AS1117 is ideal for seven-segment or dot matrix applications. The AS1117 features a low shutdown cur- user interface displays of mobile applications, set-top rent of typically 200nA, and an operational current of boxes, VCRs, DVD-players, washing machines, micro typically 350A. The number of digits can be pro- wave ovens, refrigerators and other white good or per- grammed, the devices can be reset by software, and an sonal electronic applications. external clock is also supported. The device is available in a TQFN(4x4)-24 package. Figure 1. AS1117 - Typical Application Diagram VDD 2.7V to 5.5V VDD DIG0 to 8 DIG7 9.53k SEGA-DP ISET 8 KEY0-7 AS1117 SDA SDA SCL KEY SCL IRQ IRQ P RESETN GND www.austriamicrosystems.com/LED-Driver-ICs/AS1117 Revision 1.00 1 - 23 ams AG Technical content still valid