Temperature Compensating Gamma Trimster TM ATT3209

www.DataSheet4U.com Preliminary Information Temperature Compensating Gamma Trimster™ ATT3209 DESCRIPTION FEATURES • 9 Programmable Buffered Gamma Correction Outputs (V GMA0 – VGMA8) − VGMA Output Range 0 to 14V − VGMA Output Accuracy Better Than 1% of AVDD Reference − VGMA Output Drive > 100µA Nonvolatile Storage of 32 Gamma Reference Providing − Dynamic Gamma Correction and Gamma Correction Based on Programmed Temperature Profiles 2 Programmable Buffered VCOM Outputs In System Programmability Digital Programming Interface The ATT3209 is a programmable gamma reference that is designed to address gamma correction in high-resolution LCD panels. The gamma voltage out puts are programmable with their individual output values saved in a nonvolatile analog storage cell. The storage cells are arranged in a 9 x 32 array allowing thirty-two gamma correction profiles to be stored. Depending upon the application requirements the ATT3209 is configured to provide either two or three temperature compensated Bank Select outputs that would be used to drive the respective Bank Select inputs of the AGT3209 Gamma Trimster. In addition to the V GMA outputs there are two programmable VCOM outputs providing independent multiple VCOM trim points to minimize flicker on the LCD panel. • • • • • • • • APPLICATIONS Yield Improvement through Gamma Programming at Test Simple Implementation of Dynamic Gamma Compensation LCD Panel Color Calibration DataSheet4U.com Optimized Temperature Dependent Gamma Correction DataShee DataSheet4U.com Proprietary and Confidential Typical Application Rev 2/7/2005 DataSheet 4 U .com www.DataSheet4U.com Alta Analog ATT3209 ABSOLUTE MAXIMUM RATINGS Over operating free-air temperature range unless otherwise specified (1) PARAMETER Analog Supply, AVDD (2) Max 14.5 9 14 5 Unit V V V V mA Delta VREF1 and VREF2, DeltaVREF Programming Supply VPP Digital Supply VCC Continuous Total Power Dissipation Operating Free-air Temperature Range, TA Maximum Junction Temperature, TJ Storage Temperature, TSTG Lead Temperature 1.6mm (1/16 inch) from Case for 10 seconds -25 to +125 150 -65 to 150 260 ºC ºC ºC ºC (1) Stresses beyond those listed under “absolute maximum ratings” 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 under “recommended operating conditions” is not implied. Exposure to absolute maximum rated conditions for extended periods may affect device reliability. (2) All voltage values are with respect to VSS. DISSIPATION RATING TABLE t4U.com PACKAGE TYPE 32 Lead MLF (QFN) PACKAGE DESIGNATOR THETAJC o DataSheet4U.com 1.1 C/W THETAJA 34 C/W o DataShee RECOMMENDED OPERATING CONDITIONS Symbol Parameter TA Operating Free air Temperature AVDD Analog Supply Voltage (with respect to V SS) VPP Programming Supply Voltage (with respect to V SS) VCC Digital Supply Voltage (with respect to V SS) Min 0 10 9 2.7 Typ 13 10 3.3 Max 85 14 14 3.6 Units o C V V V DataSheet4U.com Proprietary and Confidential Page 2 Revision 2/7/2005 DataSheet 4 U .com www.DataSheet4U.com Alta Analog ELECTRICAL CHARACTERISTICS Operating over free-air temperature range, VPP = 9V to 14V, VCC = 3.3V, AVDD = 14V ATT3209 SUPPLIES Symbol IAVDD ICC Parameter Analog Supply Current Digital Supply Current Active Test Condition V GMA 0 thru V GMA 8 = Nominal Setting V REF1/V REF2 Delta ≤ 9V Vcc = 3.3V, B0-B5, SDA, V PP = GND Min Typ 9 300 Max Units mA µA ANALOG CHARACTERISTICS Symbol VCOM VPROG VDRIFT VSTAB VREF Delta1 VREF Delta2 Parameter VCOM1, VCOM2 Output Voltage, Low VGMA Programming Precision VGMA Drift VGMA Stability over operating conditions 10 Years @ 70 deg. C. Test Condition IO = 100µA Min V COM1V Typ VCOM in Max V COM+1V Units V mV mV mV V V -5 -5 -5 ±2.5 +5 5 5 9 9 VREF 1-VREF 2 VREF 2-VREF 1 t4U.com DC OPERATING CHARACTERISTICS Symbol Parameter VIL VIH tDLY SDA, B0-B5 Input Low Voltage SDA, B0-B5 Input HighVoltage Delay B0-B5 change to VGMA output Test Condition Min V CCx0.8 Typ Max V CCx.20 Units V V ms DataShee DataSheet4U.com Note: Detailed programming information is available from Alta Analog in the ATT3209 Addendum. DataSheet4U.com Proprietary and Confidential Page 3 Revision 2/7/2005 DataSheet 4 U .com www.DataSheet4U.com Alta Analog ATT3209 Nominal VGMA is dependent upon VREF 1 and VREF 2 and is calculated as follows: RRATIOx(V REF 2-VREF 1)+VREF 1 FIRST ORDER GAMMA CURVE VALUES Symbol VGMA0 VGMA1 VGMA2 VGMA3 VGMA4 VGMA5 VGMA6 VGMA7 VGMA8 Parameter Gamma 0 Output Gamma 1 Output Gamma 2 Output Gamma 3 Output Gamma 4 Output Gamma 5 Output Gamma 6 Output Gamma 7 Output Gamma 8 Output Gamma 8 Output Gamma 7 Output Gamma 6 Output Gamma 5 Output Gamma 4 Output Gamma 3 Output Gamma 2 Output Gamma 1 Output Gamma 0 Output Test Condition RRATIO0 = 0.909 V REF2 = 14V, V REF1 = 7V RRATIO1 = 0.660 V REF2 = 14V, V REF1 = 7V RRATIO2 = 0.525 V REF2 = 14V, V REF1 = 7V RRATIO3 = 0.393 V REF2 = 14V, V REF1 = 7V RRATIO4 = 0.319 V REF2 = 14V, V REF1 = 7V RRATIO5 = 0.264 V REF2 = 14V, V REF1 = 7V RRATIO6 = 0.180 V REF2 = 14V, V REF1 = 7V RRATIO7 = 0.024 V REF2 = 14V, V REF1 = 7V RRATIO8 = 0 V REF2 = 14V, V REF1 = 7V RRATIO8 = 0 V REF2 = 0V, V REF1 = 7V RRATIO7 = 0.024 V REF2 = 0V, VREF1 = 7V RRATIO6 = 0.180 V REF2 = 0V, VREF1 = 7V RRATIO5 = 0.264 V REF2 = 0V, VREF1 = 7V RRATIO4 = 0.319 V REF2 = 0V, VREF1 = 7V RRATIO3 = 0.393 V REF2 = 0V, VREF1 = 7V RRATIO2 = 0.525 V REF2 = 0V, VREF1 = 7V RRATIO1 = 0.660 V REF2 = 0V, VREF1 = 7V RRATIO0 = 0.909 V REF2 = 0V, V REF1 = 7V Min. Trim 12.363 10.618 9.672 8.754 8.231 7.849 7.262 6.168 6 6 5.832 4.74 4.152 3.767 3.249 2.325 1.38 0 Nom 13.363 11.618 10.672 9.754 9.231 8.849 8.262 7.168 7 7 6.832 5.74 5.152 4.767 4.249 3.325 2.38 0.637 Max Trim 14.363 12.618 11.672 10.754 10.231 9.849 9.262 8.168 8 8 7.832 6.74 6.152 5.767 5.249 4.325 3.38 1.637 Units V V V V V V V V V V V V V V V V V V t4U.com VGMA9 VGMA10 VGMA11 VGMA12 VGMA13 VGMA14 VGMA15 VGMA16 VGMA17 DataShee DataSheet4U.com DataSheet4U.com Proprietary and Confidential Page 4 Revision 2/7/2005 DataSheet 4 U .com www.DataSheet4U.com Alta Analog ATT3209 INPUT / OUTPUT FUNCTION DESCRIPTION Name VDD AVDD VGMA0VGMA8 B0 – B2 Description Digital Supply Input Analog Supply Analog Outputs Bank Select Value Range 3V to 3.3V 10-14 V VREF 1 to VREF 2 I/O’s Analog Gamma Output Channels Function B3 – B5 Bank Select VREF 1/ VREF 2 AOUT Input Reference voltages Analog Output Programming Voltage & Serial Clock t4U.com VPP DTSEL Temperature Profile Select VTEMP Temperature sensor input ATTEN ATT enable input OSC BEN Oscillator output Bank ENABLE During normal ATT3209 operation the B0 – B2 pins are outputs that output the result of the temperature profile logic. The B3-B5 inputs are the dynamic bank select inputs. The state of DTSEL CMOS inputs determines whether the banks are arranged as 8 banks of 4 profiles or 4 banks of 8 profiles. Reference voltages for generating VGMA 0-14 Volts outputs. Outputs the current value of the selected channel of the selected bank during programming Dual Function: 10-14Volts Programming mode - Input for VPP pulses for adjusting the VGMA output values. VIL to VIH Digital mode – clock input for serial DataSheet4U.com interface. Internally this input tied to ground through a 100K ohm resistor. The state of DTSEL selects the five B inputs that will be used by CMOS Input the ATT3209. DTSEL low configures the array 4 banks of 8 temperature profiles. DTSEL high configures the array 8 dynamic banks of 4 temperature profiles. Internally this input tied to ground through a 100K ohm resistor. Temperature sensor input to the programmable temperature profile array. Internally this input tied to ground through a CMOS input 100K ohm resistor. This input should be tied directly to VCC for normal device operation. OSC is an output used during test and will be a no–connect during normal device operation. DataShee DataSheet4U.com Proprietary and Confidential Page 5 Revision 2/7/2005 DataSheet 4 U .com www.DataSheet4U.com Alta Analog ATT3209 t4U.com DataShee DataSheet4U.com Figure 1: Typical gamma correction curve. FUNCTIONAL DESCRIPTION The ATT3209 is a programmable gamma correction reference device with high drive output buffers. The device can be easily programmed prior to or during any phase of the LCD-panel manufacturing process. The gamma reference voltages are programmed and saved on nonvolatile storage cells. VGMA Figure 1 shows a typical gamma correction curve with 18 reference points. The ATT3209 VGMA outputs can be programmed to match any point on the curve. The 9 outputs (V GMA0 through VGMA8) approximate one half of the curve. Internal to the ATT3209, between VREF 1 and VREF 2, there is a resistor string along which are tap points that approximate a first order gamma curve. The nominal VGMA reference voltages are a ratio of the voltage differential between the VREF inputs and are calculated by the following: RRATIO * (V REF 2-VREF 1) +VREF 1. The R RATIO values are shown in Table 1. The nominal VGMA value can be trimmed ±1V by programming, with the final value being stored on a nonvolatile storage cell. Because the resistor string is fixed to approximate one half of the gamma curve the VREF inputs are reversible with respect to which is more positive. As an example: in order to generate the points on the gamma curve shown in Figure 1the ATT3209 generating VGMA0-VGMA8 would have its VREF 1 tied to VCOM and VREF 2 tied to AVDD . The ATT3209 generating VGMA9VGMA17 would have its VREF 1 tied to VCOM and VREF 2 tied to VSS. The VGMA buffers can drive the outputs to within 200mV of AVDD and VSS. DataSheet4U.com Proprietary and Confidential Page 6 Revision 2/7/2005 DataSheet 4 U .com www.DataSheet4U.com Alta Analog VGMA VGMA0 VGMA1 VGMA2 VGMA3 VGMA4 VGMA5 VGMA6 VGMA7 VGMA8 RRATIO