AS1115 DB-YELLOW austriamicrosystems, AS1115 DB-YELLOW Datasheet
AS1115 DB-YELLOW
Specifications of AS1115 DB-YELLOW
Related parts for AS1115 DB-YELLOW
AS1115 DB-YELLOW Summary of contents
Page 1
... Figure 1. AS1115 - Typical Application Diagram V DD 2.7 to 5.5V 9.53kΩ ISET SDA SDA SCL SCL IRQ IRQ µP www.austriamicrosystems.com/LED-Driver-ICs/AS1115 2 Key Features ! 3.4MHz I²C-Compatible Interface ! Individual LED Segment Control ! Readback for 16 Keys plus Interrupt ! Open and Shorted LED Error Detection - Global or Individual Error Detection ) is SET ...
Page 2
... KEYB 13 10 ISET SCL IRQ SEGA:SEGG 15-18, 12-15, 17-20 , SEGDP 20-23 VDD 19 16 Exposed Pad - www.austriamicrosystems.com/LED-Driver-ICs/AS1115 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 ...
Page 3
... DIG0:DIG7 Sink Current Current SEGA:SEGG, SEGDP Humidity Digital outputs Electrostatic Discharge All other pins Latch-Up Immunity Thermal Resistance Θ JA Ambient Temperature Storage Temperature Package Body Temperature www.austriamicrosystems.com/LED-Driver-ICs/AS1115 may cause permanent damage to the device. These are stress ratings only, Min Max Units -0 -0 0.3 ...
Page 4
... HIGH Setup Time for Repeated t SETUPSTART START Condition Data Setup Time t SETUPDATA Data Hold Time t HOLDDATA SCL Rise Time t RISE(SCL) www.austriamicrosystems.com/LED-Driver-ICs/AS1115 = -40 to +85°C, typ. values @ T = +25ºC, V AMB Conditions All digital inputs GND +25ºC AMB single digit +85ºC AMB R = open circuit. ...
Page 5
... The Min / Max values of the Timing Characteristics are guaranteed by design. 2. All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. Figure 3. Timing Diagram SDI t BUF t HOLDSTART LOW SCL STOP START www.austriamicrosystems.com/LED-Driver-ICs/AS1115 Conditions t HOLDSTART t HIGH t SETUPDATA SETUPSTART Repeated t HOLDDATA START Revision 1 ...
Page 6
... Vseg = 4V; Vdd = 5V 0 -40 - Tamb (°C) Figure 8. Segment Current vs. Supply Voltage 2.7 3.1 3.5 3.9 4.3 Vdd (V) www.austriamicrosystems.com/LED-Driver-ICs/AS1115 Figure 5. Display Scan Rate vs. Temperature; 800 780 760 740 720 Tamb=-40°C 700 Tamb=+25°C Tamb=+85°C 680 4.7 5.1 5.5 -40 -15 Figure 7. Segment Current vs ...
Page 7
... Vseg (V) Figure 14 3.3V SEG SEG 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 Vseg (V) www.austriamicrosystems.com/LED-Driver-ICs/AS1115 Figure 11. Input High Level vs. Supply Voltage 3.5 3 2.5 2 1.5 1 Vdd = 2.7V Vdd = 3.3V Vdd = 4V 0.5 Vdd = 5V Vdd = 5.5V 0 2.7 3.1 0.25 0.3 0.35 Figure 13 ...
Page 8
... VDD 14 I²C SCL Interface 1 SDA Control - Registers Figure 17. ESD Structure valid for the pins: VDD - IRQ - SCL - SDA - ISET - SEGA-G, SEGDP - KEYA, KEYB www.austriamicrosystems.com/LED-Driver-ICs/AS1115 Open/Short Detection + – + – Logic Registers Data - Registers Scan - Registers AS1115 Revision 1.07 VDD R SET 19 VDD ...
Page 9
... A device that acknowledges must pull down the SDA line during the acknowledge clock pulse in such a way that the SDA line is stable LOW during the HIGH period of the acknowledge clock pulse. Of course, setup and hold times must be taken into account. A master must signal an end of data to the slave by not generating an www.austriamicrosystems.com/LED-Driver-ICs/AS1115 8 9 ...
Page 10
... Following the START condition, the AS1115 monitors the I²C bus, checking the device type identifier being transmitted. Upon receiving the address code, and the R/W bit, the slave device outputs an acknowledge signal on the SDA line. www.austriamicrosystems.com/LED-Driver-ICs/AS1115 6 5 ...
Page 11
... S R/W Slave Address Acknowledge from AS1115 Figure 24. Reading nBytes from AS1115 From Master to Slave From Slave to Master Acknowledge from AS1115 S R/W Slave Address 1 www.austriamicrosystems.com/LED-Driver-ICs/AS1115 (see Figure 21 on page D13 D12 D11 D10 AS1115 Registers D15 D14 D13 D12 D11 D10 D9 D8 ...
Page 12
... Global Intensity 000 Scan Limit 000 Shutdown 000 Self-Adressing 001 Feature 000 Display Test Mode 000 DIG0:DIG1 Intensity 000 DIG2:DIG3 Intensity 000 DIG4:DIG5 Intensity 000 DIG6:DIG7 Intensity 000 www.austriamicrosystems.com/LED-Driver-ICs/AS1115 Table 7). During shutdown mode the Digit-Registers maintain their Address D12 D11 D10 ...
Page 13
... No decode for digits 7:0 Code-B/HEX decode for digit 0. No decode for digits 7:1 Code-B/HEX decode for digit 0:2. No decode for digits 7:3 Code-B/HEX decode for digits 0:5. No decode for digits 7:6 Code-B/HEX decode for digits 0,2,5. No decode for digits www.austriamicrosystems.com/LED-Driver-ICs/AS1115 Address D12 D11 D10 D9 ...
Page 14
... D7 D6: The decimal point can be enabled with every character by setting bit Table 10. HEX Font Register Data Char- acter D7 D6: The decimal point can be enabled with every character by setting bit www.austriamicrosystems.com/LED-Driver-ICs/AS1115 Register Data Char- acter D7 D6 Register Data Char- acter D7 D6 ...
Page 15
... IRQ is triggered. A short writes a logical “0” whereas an open writes a logical “1” as keyscan register bit. Note: If the blink_en bit (bit D4 in the Feature Register 0x0E) is set to ‘1’, the keyscan is not returning a valid value. www.austriamicrosystems.com/LED-Driver-ICs/AS1115 D7 D6 ...
Page 16
... Selecting RSET Resistor Value and Using External Drivers on page SET controlled globally for all digits, or for each digit individually. The global intensity command will write intensity data to all four individual brightness registers, while the individual intesity command will only write to the associated individual intensity register. www.austriamicrosystems.com/LED-Driver-ICs/AS1115 LED_global ...
Page 17
... Note: To avoid differences in brightness this register should not be used to blank parts of the display (leading zeros). Table 19. Scan-Limit Register Format (Address (HEX) = 0x0B)) HEX Scan Limit Code D7:D3 D2 Display digit 0 only 0xX0 Display digits 0:1 0xX1 Display digits 0:2 0xX2 Display digits 0:3 0xX3 www.austriamicrosystems.com/LED-Driver-ICs/AS1115 . SET Duty Cycle D2 D1 LSB 9/ ...
Page 18
... D5 blink_freq_sel 0 R/W D6 sync 0 R/W D7 blink_start 0 R/W www.austriamicrosystems.com/LED-Driver-ICs/AS1115 blink_en NU decode_sel Bit Description External clock active Internal oscillator is used for system clock Pin CLK of the serial interface operates as system clock input. Resets all control registers except the Feature Register Reset Disabled. Normal operation. ...
Page 19
... PD = 5V(5mA) + (5V - 2.2V)(15/16 x 40mA 0.865W Θ Thus, for a TQFN(4x4)-24 package J,MAX AMB In this example the maximum ambient temperature must stay below 123.61°C. www.austriamicrosystems.com/LED-Driver-ICs/AS1115 . The current that flows into I SET . Typical values for R SET SET ) are given in Table 22 & Table 23. The maximum current the AS1115 can ...
Page 20
... In order to achieve optimal performance the AS1115 should be placed very close to the LED display to minimize effects of electromagnetic interference and wiring inductance. Furthermore recommended to connect a 10µF and a 0.1µF ceramic capacitor between pins V avoid power supply ripple (see Figure www.austriamicrosystems.com/LED-Driver-ICs/AS1115 13) must be set to ‘00000000’ as described in Table 11 on page 15, where bit D0 corresponds to segment G and DIG0 to ...
Page 21
... 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 www.austriamicrosystems.com/LED-Driver-ICs/AS1115 Revision 1. ...
Page 22
... All dimensions are in millimeters; angles in degrees. 2. Dimension b applies to metallized terminal and is measured between 0.25mm and 0.30mm from terminal tip. Dimension L1 represents terminal full back from package edge up to 0.1mm is acceptable. 3. Coplanarity applies to the exposed heat slug as well as the terminal. 4. Radius on terminal is optional. www.austriamicrosystems.com/LED-Driver-ICs/AS1115 ...
Page 23
... Buy our products or get free samples online at ICdirect: For further information and requests, please contact us or find your local distributor at www.austriamicrosystems.com/LED-Driver-ICs/AS1115 Table 24. Description 64 LEDs, I²C Interfaced LED Driver with Keyscan http://www.austriamicrosystems.com/ICdirect mailto:sales@austriamicrosystems.com http://www.austriamicrosystems.com/distributor Revision 1.07 Delivery Form Package Tape and Reel QSOP-24 Tape and Reel TQFN(4x4)- ...
Page 24
... The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the tech- nical data herein ...