AS1118 AMSCO
Document overview
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Technical content
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
64 LED Driver for Mobile Applications with Error Detection
1 General Description
Figure 1. AS1118 - Typical Application Diagram
2 Key Features
3 Applications
Table 1. Available Products
4 Pinout
Figure 2. Pin Assignments (Top View) Table 2. Pin Descriptions 16 bits of serial data are latched on the rising edge of this pin. to put the device into shutdown. xternal Drivers on page 15). decimal point drive that source current to the display. GND with a 10µF and a 0.1µF capacitor to avoid power supply ripple. to the circuit-board ground plane to maximize power dissipation.
www.austriamicrosystems.com/LED-Driver-ICs/AS1118 Revision 1.01 3 - 20 AS1118 Datasheet - Abs olute M aximu m Rating s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 3 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Section 6 Electrical C haracteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. T able 3. Absolute Maximum Ratings Parameter Min Max Units Notes Electrical Parameters Input Voltage Range V DD to GND -0.3 7 V All other pins to GND -0.3 7 or V DD + 0.3 V Current DIG0:DIG7 Sink Current 500 mA SEGA:SEGG, SEGDP 100 mA Input Current (latch-up immunity) ±100 mA Norm: JEDEC 78 Electrostatic Discharge Electrostatic Discharge Digital outputs 1000 V Norm: MIL 833 E method 3015 All other pins 1000 V Thermal Information Thermal Resistance Θ JA 30.5 ºC/W on PCB Temperature Ranges and Storage Conditions Junction Temperature +150 °C Storage Temperature -55 +150 ºC Package Body Temperature +260 ºC The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD-020 “Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices”. The lead finish for Pb-free leaded packages is matte tin (100% Sn). Humidity non-condensing 5 85 % Moisture Sensitive Level 3 % Represents a max. floor life time of 168h ams AG Technical content still valid
6 Electrical Characteristics
See Figure 18 on page 8 for more information. Table 5. Logic Inputs/Outputs Characteristics Table 6. SPI Timing Characteristics
7 Typical Operating Characteristics
Figure 3. Display Scan Rate vs. Supply Voltage; Figure 4. Display Scan Rate vs. Temperature; Figure 5. Segment Current vs. Temperature; Figure 6. Segment Current vs. RSET ;
8 Detailed Description
Figure 15. AS1118 - Block Diagram Figure 16. ESD Structure
RESETN is set to logic low an according write to the Shutdown Register is done internally. blanked. During shutdown mode the Digit-Registers maintain their data. Register bit D7 (page 10) = 0. writing to the Shutdown Register.
- All registers are selected using a 8-bit address w ord, and communication is done via the serial interface.
without rewriting the whole register contents. down, display test and features selection registers. Table 8. Register Address Map
Note: Write operation: D14=0; Read operation: D14=1. The Shutdown Register controls AS1118 shutdown mode. e Decode Enable Register bits. Note: A logic high enables decoding and a logic low bypasses the decoder altogether. D7 = 1 turns the decimal point on). Table 11 lists the code-B font; Table 12 lists the HEX font. AS1118. Table 13 shows the 1:1 pairing of each data bit to the appro priate segment line. Table 9. Shutdown Register Format (Address (HEX) = 0x0C)) Table 10. Decode Enable Register Format Examples
Figure 19. Standard 7-Segment LED Table 11. Code-B Font The decimal point can be enabled with every character by setting bit D7 = 1. Table 12. HEX Font The decimal point can be enabled with every character by setting bit D7 = 1. Table 13. No-Decode Mode Data Bits and Corresponding Segment Lines
occurred before reading out detailed diagnostic data. Note: All settings of the digit- and control-registers are maintained. These eight registers contain the result of the LED open/short test for the individual LED of each digit. Note: If more than 2 shorts occure in the LED array, detection of individual LED fault could become limited to blocs. Table 14. Testmode Register Summary Table 15. Testmode Register Bit Description (Address (HEX) = 0x0F)) Table 16. LED Diagnostic Register Address
down to 1/16 of the peak current set by RSET . update frequency is typically 0.8kHz. If the number of digits displayed is reduced, the update frequency is increased. SET should be adjusted accordingly. Note: To avoid differences in brightness this register should not be used to blank parts of the display (leading zeros). Table 17. Intensity Register Format Table 18. Intensity Register Address Table 19. Scan-Limit Register Format (Address (HEX) = 0x0B))
SPI-compatible interface, setting the blinking rate, and resetting the blink timing. Note: At power-up the Feature Register is initialized to 0. re 20 on page 16). The LD and SCL signals are connected to all devic es. mand, and subsequently update its register. Table 20. Feature Register Summary Table 21. Feature Register Bit Descriptions (Address (HEX) = 0xXE) Enables and disables various device features. 0 = Internal oscillator is used for system clock. 1 = Pin CLK of the serial interface operates as system clock input. Resets all control registers except the Feature Register. 0 = Reset Disabled. Normal operation. Register) identically after power-up. Note: The Digit Registers maintain their data. Selects display decoding for the selected digits (Table 10 on page 10). = Enable Code-B decoding (see Table 11 on page 11). = Enable HEX decoding (see Table 12 on page 11).
3 NU Not used
D4 blink_en 0 R/W Enables blinking. 0 = Disable blinking. 1 = Enable blinking. 0 = Blink period typically is 1 second (0.5s on, 0.5s off). 1 = Blink period is 2 seconds (1s on, 1s off). bit D7 determines how blinking starts. 0 = Blinking starts with the display turned off. 1 = Blinking starts with the display turned on.
9 Typical Application
current that flows through the LEDs. that the devices drive high currents. Note: The display brightness can also be logically controlled (see Intensity Control Register (0x0A) on page 12). DUTY is the duty cycle set by intensity register (page 13). In this example the maximum ambient temperature must stay below 73.88° C. Table 23. RSET vs. Segment Current and LED Forward Voltage, VDD = 4.0V & 5.0V
The application example in Figure 20 shows the AS1118 in the 8x8 LED dot matrix mode. it D7 corresponds to segment DP . Note: For a multiple-digit dot matrix, multiple AS1118 devices can be cascaded easily. Figure 20. Application Example as LED Dot Matrix Driver of electromagnetic interference and wiring inductance. GND to avoid power supply ripple (see Figure 15 on page 7).
Figure 21. TQFN(4x4)-24 Marking Table 24. Packaging Code YYWWIZZ
Figure 22. TQFN(4x4)-24 Package
The devices are available as the standard products shown in Table 25. ote: All products are RoHS compliant and austriamicrosystems green. Table 25. Ordering Information
www.austriamicrosystems.com/LED-Driver-ICs/AS1118 Revision 1.01 2 0 - 20 AS1118 Datasheet Copyrights Copyright © 1997-2012, austriamicrosystems AG, Tobelbaderstrasse 30, 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. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. 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 technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact ams AG Technical content still valid