AS1115 austriamicrosystems AG, AS1115 Datasheet
AS1115
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AS1115 Summary of contents
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... ² General Description The AS1115 is a compact LED driver for 64 single LEDs or 8 digits of 7-segments. The devices can be pro- grammed via an I²C compatible 2-wire interface. ...
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... VDD Exposed Pad - www.austriamicrosystems.com DIG2 1 DIG3 2 GND 3 AS1115 DIG4 4 DIG5 5 DIG6 Description Serial-Data I/O. Open drain digital I/O I²C data pin. Digit Drive Lines. Eight digit drive lines that sink current from the display common cathode. Keyscan detection optional, but must be polled by the µ ...
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... AS1115 Datasheet - Absolute Maximum Ratings Stresses beyond those listed in Table 2 and functional operation of the device at these or any other conditions beyond those indicated in Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ...
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... AS1115 Datasheet - Electrical Characteristics V = 2.7 to 5.5V 9.53kΩ SET AMB specified). Table 3. Electrical Characteristics Symbol Parameter Operating Supply Voltage V DD Shutdown Supply Current I DDSD Operating Supply Current I DD ...
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... AS1115 Datasheet - Table 5. Timing Characteristics Symbol Parameter f SCL Frequency SCL Bus Free Time Between STOP and t BUF START Conditions Hold Time for Repeated t HOLDSTART START Condition SCL Low Period ...
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... AS1115 Datasheet - Typical Operating Characteristics R = 9.53kΩ SET Rset DD Figure 4. Display Scan Rate vs. Supply Voltage; 780 760 740 720 700 680 2.7 3.1 3.5 3.9 4.3 Vdd (V) Figure 6. Segment Current vs. Temperature; ...
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... AS1115 Datasheet - Figure 10. V vs. I DIGIT DIGIT 0.4 0.3 0.2 0 0.05 0.1 0.15 0.2 Idig (A) Figure 12 SEG SEG 2.5 3 3.5 4 Vseg (V) Figure 14 ...
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... Figure 17. ESD Structure valid for the pins: VDD - IRQ - SCL - SDA - ISET - SEGA-G, SEGDP - KEYA, KEYB www.austriamicrosystems.com Open/Short Detection + – + – Logic Registers Data - Registers Scan - Registers AS1115 Revision 1.03 www.DataSheet4U.com VDD R SET 19 VDD 13 ISET 8 15-18, 20-23 SEGA-G, SEGDP 8 2-5, 7-10 DIG0 to DIG7 2 11, 12 KEYA, KEYB ...
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... Datasheet - I²C Interface The AS1115 supports the I²C serial bus and data transmission protocol in high-speed mode at 3.4MHz. The AS1115 operates as a slave on the I²C bus. The bus must be controlled by a master device that generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions ...
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... Slave Transmitter Mode . The first byte (the slave address) is received and handled as in the slave receiver mode. However, in this mode the direction bit will indicate that the transfer direction is reversed. Serial data is transmitted on SDA by the AS1115 while the serial clock is input on SCL. START and STOP conditions are recog- nized as the beginning and end of a serial transfer. ...
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... AS1115 Datasheet - Command Byte The AS1115 operation, (see Table 6) is determined by a command byte Figure 21. Command Byte MSB D15 D14 Figure 22. Command and Single Data Byte Received From Master to Slave From Slave to Master ...
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... When Note: Shutdown Register bit the Feature Register is left unchanged when entering or leaving shut- down mode. If the AS1115 is used with an external clock, Shutdown Register bit D7 should be set to 1 when writing to the Shutdown Register. Digit- and Control-Registers The AS1115 devices contain 8 Digit-Registers,11 control-registers and 10 diagnostic-registers, which are listed in 6. All registers are selected using a 8-bit address word, and communication is done via the I² ...
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... Diagnostic Digit 7 000 KEYA 000 KEYB 000 The Shutdown Register controls AS1115 shutdown mode. Table 7. Shutdown Register Format (Address (HEX) = 0x0C)) Mode Shutdown Mode, Reset Feature Register to Default Settings Shutdown Mode, Feature Register Unchanged Normal Operation, Reset Feature Register to Default Settings ...
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... AS1115 Datasheet - Figure 25. Standard 7-Segment LED Intensity Control and Inter-Digit Blanking Table 9. Code-B Font Register Data Char- acter D7 D6: ...
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... A single command for selfaddressing will update all connected AS1115. This command has to be done after startup or everytime the AS1115 gets disconnected from the supply. The I²C address definition must be done with fixed connection, since I²C detection is excluded from debounce time of key reg- isters. Note: A short writes a logical “ ...
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... Datasheet - Display-Test Mode The AS1115 can detect open or shorted LEDs. Readout of either open LEDs or short LEDs is possible, as well relation of open and short. Note: All settings of the digit- and control-registers are maintained. ...
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... AS1115 Datasheet - Display brightness is controlled by an integrated pulse-width modulator which is controlled by the lower-nibble of the Intensity Control Register. The modulator scales the average segment-current in 16 steps from a maximum of 15/16 down to 1/16 of the peak current set by R Table 17 ...
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... AS1115 Datasheet - Feature Register (0x0E) The Feature Register is used for enabling various features including switching the device into external clock mode, applying an external reset, selecting code-B or HEX decoding, enabling or disabling blinking, setting the blinking rate, and resetting the blink timing ...
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... Calculating Power Dissipation The upper limit for power dissipation (PD) for the AS1115 is determined from the following equation Where the supply voltage. DD DUTY is the duty cycle set by intensity register ...
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... IRQ Keyscan The key readback of the AS1115 can be used either for push buttons as well as switches. If only a single key is pressed (shorted time no additional diodes are required detection of multiple simultaneous keystrokes is required diodes within the keypath, as shown in would result in ambiguous results. Since KEYA and KEYB have independent inputs only keys on the same path are affected ...
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... AS1115 Datasheet - Package Drawings and Markings The AS1115 is available in the QSOP-24 package. Figure 28. QSOP-24 Package Symbol Min Max A 1.35 1.75 A1 0.10 0.25 A2 1.37 1.57 b 0.20 0.30 C 0.19 0.25 D 8.55 8.74 E 5.79 6.20 E1 3.81 3.99 e 0.635 BSC h 0.22 0.49 L 0.40 1.27 θ 0º 8º ...
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... AS1115 Datasheet - Figure 29. TQFN(4x4)-24 Package Symbol Min Typ A 0.50 0.55 A1 0.00 A3 0.152REF b 0.18 0.23 D 4.00BSC E 4.00BSC D2 2.70 2.80 E2 2.70 2.80 Notes: Unilateral coplanarity zone applies to the exposed heat sink slug as well as the terminals. 1. Dimensioning and tolerancing conform to ASME Y14.5M-1994 . ...
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... Datasheet - Ordering Information The devices are available as the standard products shown in Table 24. Ordering Information Part Marking AS1115-BSST AS1115 AS1115-BQFT ASSD All devices are RoHS compliant and free of halogene substances. www.austriamicrosystems.com Table 24. Delivery Form Tape and Reel ...
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... AS1115 Datasheet Copyrights Copyright © 1997-2009, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. ...