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 AS1115 64 LEDs, IC Interfaced LED Driver with Keyscan 1 General Description 2 Key Features up to 1MHz IC-Compatible Interface The AS1115 is a compact LED driver for 64 single LEDs or 8 digits of 7-segments. The devices can be programmed via an IC compatible Individual LED Segment Control 2-wire interface. Readback for 16 Keys plus Interrupt Every segment can be individually addressed and updated sepa- Open and Shorted LED Error Detection rately. Only one external resistor (RSET) is required to set the cur- - Global or Individual Error Detection rent. LED brightness can be controlled by analog or digital means. Hexadecimal- or BCD-Code for 7-Segment Displays The devices include an integrated BCD code-B/HEX decoder, multi- 200nA Low-Power Shutdown Current (typ data retained) plex scan circuitry, segment and display drivers, and a 64-bit mem- ory. Internal memory stores the shift register settings, eliminating the Digital and Analog Brightness Control need for continuous device reprogramming. Display Blanked on Power-Up All outputs of the AS1115 can be configured for key readback. Key- Drive Common-Cathode LED Displays switch status is obtained by polling for up to 64 keys while 16 keys Supply Voltage Range: 2.7 to 5.5V can be used to trigger an interrupt. Software Reset Additionally the AS1115 offers a diagnostic mode for easy and fast production testing. Optional External Clock The AS1115 features a low shutdown current of typically 200nA, and Package: an operational current of typically 350A. The number of digits can - QSOP-24 be programmed, the devices can be reset by software, and an exter- - TQFN(4x4)-24 nal clock is also supported. The device is available in a QSOP-24 and the TQFN(4x4)-24 pack- age. 3 Applications The AS1115 is ideal for seven-segment or dot matrix user interface displays of set-top boxes, VCRs, DVD-players, washing machines, micro wave ovens, refrigerators and other white good or personal electronic applications. Figure 1. AS1115 - Typical Application Diagram VDD DIG0 to 2.7 to 5.5V 8 DIG7 9.53k SEGA-DP ISET 8 KEY0-7 AS1115 SDA 8 SDA SCL KEYA SCL IRQ P IRQ KEYB GND www.austriamicrosystems.com/LED-Driver-ICs/AS1115 Revision 1.08 1 - 25 ams AG Technical content still valid