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Preliminary Information
Temperature Compensating Gamma TrimsterTM 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 > 100A 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 Yield Improvement through Gamma Programming at Test Simple Implementation of Dynamic Gamma Compensation LCD Panel Color Calibration Optimized Temperature Dependent Gamma Correction 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.
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APPLICATIONS
Typical Application Proprietary and Confidential Rev 2/7/2005
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
C C C C
(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 PACKAGE TYPE 32 Lead MLF (QFN) PACKAGE DESIGNATOR THETAJC 1.1 C/W
o
THETAJA 34 C/W
o
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
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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 A
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 = 100A
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
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
Note: Detailed programming information is available from Alta Analog in the ATT3209 Addendum.
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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 VGMA9 VGMA10 VGMA11 VGMA12 VGMA13 VGMA14 VGMA15 VGMA16 VGMA17 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
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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 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 determines whether the banks are arranged as 8 banks of 4 profiles or 4 banks of 8 profiles. Reference voltages for generating VGMA outputs. Outputs the current value of the selected channel of the selected bank during programming Dual Function: Programming mode - Input for VPP pulses for adjusting the VGMA output values. Digital mode - clock input for serial 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 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 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. Function
B3 - B5
Bank Select
CMOS inputs
VREF 1/ VREF 2 AOUT
Input Reference voltages Analog Output Programming Voltage & Serial Clock
0-14 Volts
10-14Volts VIL to VIH
VPP
DTSEL
Temperature Profile Select
CMOS Input
VTEMP
Temperature sensor input
ATTEN
ATT enable input
CMOS input
OSC BEN
Oscillator output Bank ENABLE
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ATT3209
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.
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VGMA VGMA0 VGMA1 VGMA2 VGMA3 VGMA4 VGMA5 VGMA6 VGMA7 VGMA8 RRATIO 0.909 0.660 0.525 0.393 0.319 0.264 0.180 0.024 0.000
ATT3209
When DTSEL is tied low, the ATT3209 is configured with B0:B2 being used internally and as active outputs reflecting the temperature input, and B3 & B4 are used as the dynamic gamma inputs. When DTSEL is tied high, the ATT3209 is configured w B0 & B1 being used internally ith and as active outputs reflecting the temperature input, and B3:B5 are used as the dynamic gamma inputs. ATT3209 and AGT3209 The ATT3209 is designed to work in conjunction with the AGT3209. When they are paired the, the bank select pins are connected as shown in table 3. AGT3209 Pins B1 B2 B3 B1 B1 B2 B3 B3 B4
Table1: RRATIO Table. Dynamic Gamma Compensation In many applications, especially those which involve the display of video information such as movies or television programming, it is desirable to be able to change the gamma curve based on the active frame information. The ATT3209 stores thirty-two individual gamma curves that can be dynamically `switched in' by the panel's timing controller in response to the frame data. Temperature and Gamma Profiles The ATT3209 has two nonvolatile arrays. One is the temperature profile. This array stores up to eight programmable voltage references against which the VTEMP input is compared. As the VTEMP changes and transitions through the preset temperature profile the low order bank select (B0:B1 or B0:B2) will change, effectively selecting a new gamma profile optimal for the current temperature. These signals used internally will also be output on the B0:B2 pins. The gamma profile array is comprised of thirtytwo (32) banks of nine (9) programmable gamma outputs. The active bank, or profile, is selected by 5 of the 6 bank select inputs. The active bank select inputs are determined by the state of DTSEL as shown in Table 2. ATT3209 Active and Inactive Bank Pins
DTSEL VSS VCC B0 A A B1 A A B2 A IA B3 A A B4 A A B5 IA A
B0
ATT3209 DTSEL VSS VCC
B4 B4 B5
B0 B0
Table 3. Shared pins. VCOM The ATT3209 also provides two "trimmable" VCOM outputs. The nominal output is equivalent to Panel AVDD/2. The VCOM output voltage can be trimmed to AVDD /2 1V. For example; assume a LCD panel with a 14V panel A , VDD then VCOM can be trimmed anywhere between 6V and 8V effectively in 8mV increments. The ATT3209 is easily programmed either by Alta Analog or the end user. It can be programmed as a standalone device in most any test fixture or in-circuit on the assembled LCDpanel. PROGRAMMING The programming interface is a set of three inputs plus a digital supply (V CC ). SDA is the serial data input pin used to input instructions to the ATT3209. VPP is a dual function pin. It is first used to clock in the serial data stream. Once the instruction has been issued VPP will then be used as the programming voltage input pin. AOUT is a buffered analog voltage output that reflects the VGMA voltage level of the cell
Table 2. Active Bank Select pins.
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currently being programmed. This output is only used during the programming operation. OPERATION Once the ATT3209 is programmed it will powerup with the VGMA and VCOM outputs at their selected (state of B0-B4) program levels.
ATT3209
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ATT3209
ATT3209 Functional Block Diagram
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ATT3209
This is a Preliminary Information data sheet that describes an Alta Analog product currently in development. It is meant solely as a product description and should not be used as a design tool. Alta Analog, Inc. reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. Alta Analog, Inc. assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained herein reflect representative operating parameters, and may vary depending upon a user's specific application. While the information in this publication has been carefully checked, Alta Analog, Inc. shall not be liable for any damages arising as a result of any error or omission. Alta Analog, Inc. does not recommend the use of any of its products in life support or a viation applications where the failure or malfunction of the product can reasonably be expected to cause any failure of either system or to significantly affect their safety or effectiveness. Products are not authorized for use in such applications unless Alta Analog, Inc. receives written assurances, to its satisfaction, that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; and (c) potential liability of Alta Analog, Inc. is adequately protected under the circumstances. This document supersedes all previous versions. (c) Copyright 2004 ALTA ANALOG, Inc.
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