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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
1 General Description
flag indicates that the device is in an overtemperature condition. The AS1121 is available in a 32-pin TQFN 5x5 mm package. Figure 1. AS1121 - Block Diagram
2 Key Features
3 Applications
LED signboards, and display backlights.
90 Register 95
180 Register191
0 Register 5
0 Register 11
6 Register 11
12 Register 23
2 SDI1 CLK
4 Pinout
Figure 2. Pin Assignments (T op View) Table 1. Pin Descriptions
22 XERR
0 = LED open detection or overtemperature condition is detected.
23 SDO Serial Data Output
26 IREF Reference Current Terminal
30 GND Ground
31 OEN
0 = OUTn outputs are controlled by the greyscale PWM control. 1 = OUTn outputs are forced off; the greyscale counter is reset. Data Latch. The internal connections are switched by pin MODE. For LD (MODE = GND), the greyscale register receives new data. CC), the dot correction register receives new data. 33 Thermal Pad Thermal Pad. This pin must be connected to GND to ensure normal operation.
25 VCC
26 IREF
27 VCC
28 N/C
30 GND
15 OUT9
13 N/C
12 N/C
10 OUT6
24 GSCLK
23 SDO
21 OUT15
20 OUT14
19 OUT13
18 OUT12
17 OUT118OUT4
5 Absolute Maximum Ratings
maximum rating conditions for extended periods may affect device reliability. Table 2. Absolute Maximum Ratings application note AN01 Thermal Characteristics. Hermetic Solid State Surface Mount Devices”.
6 Electrical Characteristics
with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods.. Table 3. Electrical Characteristics
Table 4. Output Tming Characteristics
- Value can be factory trimmed for EMI improvement
- See Figure 24 on page 16.
Table 5. Serial Interface Timing Characteristics Table 3. Electrical Characteristics (Continued)
- See Figure 20 on page 13.
- See Figure 24 on page 16.
- See Figure 22 on page 14.
- See Figure 17 on page 10.
7 Typical Operating Characteristics
Figure 3. Constant Output Current vs. Output Voltage Figure 4. Constant Output Current vs. Output Voltage Figure 5. Constant Output Current vs. VOUT; RIREF = 1kΩ Figure 6. Constant Output Current vs. V OUT; RIREF = 1kΩ
Figure 15. LED Open Detection Threshold vs. T emperature Figure 16. ICOC vs. Supply Voltage; RIREF = 1kΩ
8 Detailed Description
sors in various configurations. internal registers at the rising edge of the LD signal. Note: All data is clocked in with the MSB first. Multiple AS1121 devices can be cascaded by connecting the SDO pin of one device with pin SDI of the next device (see Figure 25 on page 17). bit wide, depending on mode of the device (see LD on page 2). Figure 17. Serial Data Input Timing Diagram open-drain output, multiple AS1121 devices can be ORed together and pulled up to VCC with a single pullup resistor (see Figure 25 on page 17). This reduces the number of signals needed to report a system error.
tus can be read out from the AS1121 status register. tions (e.g. start an external cooling) against a overtemperature condition. detection circuit trips when the error detection is activated and the voltage at OUTn is less than VLOD. Note: The voltage at each OUTn is sampled 1 µs after being switched on. Please refer to Figure 18 on page 11. AS1121 status information data (SID) during a greyscale data input cycle. Figure 18. Error Detection Timing (GS=FFFFHEX, DC=3FHEX) GND, the greyscale registers are updated. If the pin MODE is tied to VCC, the dot correction registers are updated. Table 6. XERR Truth Table OUTn < VLOD 1D o n ' t C a r e 1 0 0 0 open & temp.
device logic operations. The greyscale counter is also reset when OEN is set to 1. When OEN is set to 0, all OUTn channels are in normal operation. RIREF = User-selected external resistor. dPWM is the duty cycle defined by pin OEN or the greyscale PWM value. Table 7. Pin OEN Truth T able
0 Normal Operation
Table 8. Operating Modes
latches the data into the greyscale register, the input shift register data is replaced with status information data (see Figure 23). 192 bits wide. Bits 191:176 and 31:16 contain the open LED detection status of each channel (either 191:176 or 31:16 can be used for readout). Bit 175 contains the thermal error flag status. Bits 167:72 contain the data of the dot-correction register. Bit 15:0 contains the LED shorted flags. The remaining bits are reserved. The complete status information data packet is shown in Figure 23. Figure 23. Status Information Data Packet Format
175 Temperature Error Flag (TEF, 150ºC, typ) 71:32 reserved
ments the greyscale counter by one. Figure 24. Greyscale PWM Cycle Timing Diagram factory set and can be changed on request. For further information and requests, please contact us mailto:sales@austriamicrosystems.com.
9 Package Drawings and Markings
Figure 26. 32-pin TQFN 5x5 mm Marking Figure 27. Packaging Code YYWWIZZ
Figure 28. 32-pin TQFN 5x5 mm Package
The device is available as the standard products shown in Table 9. Note: All products are RoHS compliant and austriamicrosystems green. Table 9. Ordering Information
www.austriamicrosystems.com/AS1121 Revision 1.01 21 - 21 AS1121 Datasheet Copyrights Copyright © 1997-2011, 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