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AS1113-BQFR Datasheet(PDF) 8 Page - ams AG |
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AS1113-BQFR Datasheet(HTML) 8 Page - ams AG |
8 / 24 page www.austriamicrosystems.com Revision 1.00 8 - 24 AS1113 Data Sheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description The AS1113 is designed to drive up to 16 LEDs through a fast serial interface and 16 constant-current output drivers. Furthermore, the AS1113 provides diagnostics for detecting open- or shorted-LEDs, as well as over-temperature con- ditions for LED display systems, especially LED traffic sign applications. The AS1113 contains an 16-bit shift register and an 16-bit data register, which convert serial input data into parallel out- put format. At AS1113 output stages, sixteen regulated current sinks are designed to provide uniform and constant cur- rent with excellent matching between ports for driving LEDs within a wide range of forward voltage variations. External output current is adjustable from 0.5 to 50mA using an external resistor for flexibility in controlling the brightness inten- sity of LEDs. The AS1113 guarantees to endure 15V maximum at the outputs. The serial interface is capable of operating at a minimum of 30 MHz, satisfying the requirements of high-volume data transmission. Using a multiplexed input/output technique, the AS1113 adds additional functionality to pins SDO, LD and OEN. These pins provide highly useful functions (open- and shorted-LED detection, over-temperature detection), thus reducing pin count. Over-temperature detection will work on-the-run, whereas the open- and shorted-LED detection can be used on-the-run or in low-current diagnostic mode (see page 15). Figure 7. Block Diagram AS1113 REXT OEN CLK SDI LD Current Generators Detailed Error Detection 16-Bit Data Register 16-Bit Shift Register Temperature Detection 16-Bit Open Detection & Error Register 16-Bit Short Detection & Error Register Global Error Detection SDO Indicates 16 Bit Path Control Logic +VLED |
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