AS1112 austriamicrosystems AG, AS1112 Datasheet
AS1112
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AS1112 Summary of contents
Page 1
... Table 1. Standard Products Model Power-Down TEST pin AS1112 Yes Connect to GND AS1112B No Connect additional power-down pin puts the AS1112 into a 40nA standby-mode. The AS1112 is available in a 32-pin TQFN 5x5 mm package. Figure 1. Block Diagram 1 CLK 2 SDI 26 Max OUTn V = REF Current 1.24V ...
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... XERR 1 = Normal operation. Serial Data Output 23 SDO Greyscale Clock. Reference clock for greyscale PWM control 24 GSCLK Test Pin This pin must be connected to GND (AS1112) to ensure normal operation. TEST 25 Test Pin This pin must be connected to V XTEST Reference Current Terminal 26 I REF ...
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... AS1112 Datasheet - Absolute Maximum Ratings Stresses beyond those listed in Table 3 and functional operation of the device at these or any other conditions beyond those indicated in ating Conditions on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ...
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... AS1112 Datasheet - Recommended Operating Conditions Table 4. DC Characteristics Symbol Parameter V Supply Voltage CC Voltage Applied to Output V OUT (OUT0:OUT15) V High-Level Input Voltage IH V Low-Level Input Voltage IL I High-Level Output Current ...
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... AS1112 Datasheet - Electrical Characteristics V = +3.0 to +5.5V -40 to +85ºC. Typical values are AMB Table 6. Electrical Characteristics Symbol Parameter V High-Level Output Voltage OH V Low-Level Output Voltage OL I Input Current ...
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... AS1112 Datasheet - Switching Characteristics V = +3.0 to +5.5V -40 to +85ºC. Typical values are AMB Table 7. Switching Characteristics Symbol Parameter t R0 Rise Time Fall Time PD0 t PD1 Propagation Delay Time ...
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... AS1112 Datasheet - Typical Operating Characteristics 25ºC. DD AMB Figure 3. Output Current vs RIREF = 480Ω RIREF = 1kΩ RIREF = 3.9kΩ ...
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... LD signal. Note: All data is clocked in with the MSB first. Multiple AS1112 devices can be cascaded by connecting the SDO pin of one device with pin SDI of the next device (see Figure 15 on page 15). The SDO pin can also be connected to the microcontroller to receive status information from the AS1112 ...
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... Open LED Detection The AS1112 integrated open LED detection circuit reports an error if any of the 16 LEDs is open or disconnected from the circuit. The open LED detection circuit trips when the error detection is activated OUTn is less than V ...
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... MODE. If the pin MODE is tied GND, the greyscale registers are updated. If the pin MODE is tied to V dot correction registers are updated. Delay Between Outputs The AS1112 uses graduated delay circuits between OUTn outputs. These circuits are contained in the constant-current driver block of the AS1112 (see Figure 1 on page The maximum delay is 450ns (typ) from OUT0 to OUT15 ...
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... AS1112 Datasheet - Power Dissipation To ensure proper operation of the device, the total power dissipation of the AS1112 must be below the power dissipa- tion rating of the device package. Total power dissipation is calculated as Where the device supply voltage; ...
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... GS14.11 GS OUT15 When pin MODE is tied to GND, the AS1112 enters greyscale data input mode. The device switches the input shift reg- ister to 192-bit width. After all data is clocked in, the rising edge of the LD signal latches the data into the greyscale reg- ister (see Figure 12) ...
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... Each subsequent rising edge of GSCLK increments the greyscale counter by one. The AS1112 compares the greyscale value of each OUTn channel with the greyscale counter value. All OUTn whose greyscale values equal the counter values are switched off. A OEN = 1 signal after 4096 GSCLK pulses resets the greyscale counter to zero and completes a greyscale PWM cycle www ...
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... AS1112 Datasheet - Figure 14. Greyscale PWM Cycle Timing Diagram OEN GSCLK t PD1 OUT0 Current t PD1 OUT1 Current PD1 D OUT15 Current XERR www.austriamicrosystems.com Greyscale PWM Cycle n t WL1 t WH1 ...
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... GSCLK MODE MODE OEN OEN SOUT Controller The maximum number of cascading AS1112 devices depends on the application system and is in the range of 40 devices. The minimum frequency needed can be calculated by the following equations: Where the minimum frequency needed for GSCLK; GSCLK f is the update rate of whole cascaded system ...
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... AS1112 Datasheet - Package Drawings and Markings The device is available in an 32-pin TQFN 5x5 mm package. Figure 16. 32-pin TQFN 5x5 mm Package Common Dimensions Symbol Min Nom Max A 0.80 1.00 0.203 A1 REF b 0.18 0.23 0.30 5.00 D BSC 5 ...
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... AS1112-BQFT 16-Channel LED Driver with Dot Correction and Greyscale PWM with Active-High TEST Input and Power-Down Mode AS1112B-BQFT 16-Channel LED Driver with Dot Correction and Greyscale PWM with Active-Low XTEST Input and without Power-Down Mode All devices are RoHS compliant and free of halogene substances. ...
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... AS1112 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. ...