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19-3624; Rev 0; 3/05
KIT ATION EVALU E AILABL AV
EEPROM-Programmable TFT VCOM Calibrator with I2C Interface
General Description Features
7-Bit Adjustable Sink-Current Output Resistor-Adjustable, Full-Scale Range Guaranteed Monotonic Output Over Operating Range 2-Wire I2C Interface EEPROM Stores VCOM Setting 4.5V to 20V Analog Supply Voltage Range (VAVDD) 60A (max) AVDD Supply Current 16.1V to 28V EEPROM Programming Supply Voltage Range (VHV) <1A HV Supply Current (Not in Program Mode) 8-Pin MAX
MAX8738
The MAX8738 is an I2C-programmable VCOM-adjustment solution for thin-film transistor (TFT) liquid-crystal displays (LCDs). The MAX8738 simplifies the labor-intensive VCOM-adjustment process and replaces mechanical potentiometers, which significantly reduces labor costs, increases reliability, and enables automation. The MAX8738 attaches to an external resistive voltagedivider and sinks a programmable current to set the VCOM voltage level. An internal 7-bit digital-to-analog converter (DAC) controls the sink current. The DAC is ratiometric relative to AVDD and is guaranteed to be monotonic over all operating conditions. This VCOM calibrator IC includes an EEPROM to store the desired VCOM voltage level. The EEPROM can be programmed repeatedly, giving TFT LCD manufacturers the flexibility to calibrate the display panel as many times as the manufacturing process requires. The MAX8738 features a 2-wire I2C* interface for DACadjustment commands and EEPROM programming. The interface utilizes the existing I2C bus on the LCD panel connector so no additional panel connector pins are required. The MAX1512 is a similar product with a 1-wire interface and is recommended for applications with no existing I2C interface. The MAX8738 is available in an 8-pin MAX(R) package. A complete evaluation kit is available to simplify evaluation and production development.
Ordering Information
PART MAX8738EUA MAX8738EUA+ TEMP RANGE -40oC to +85oC -40oC to +85oC PIN-PACKAGE 8 MAX 8 MAX
+Denotes lead-free package.
Applications
LCD Panels Notebook Computers Display Products LCD TVs
+3.3V
Typical Operating Circuit
VGON
VDD
HV AVDD
AVDD
SDA
MAX is a registered trademark of Maxim Integrated Products, Inc.
I2C BUS SCL GND RSET
R1
Pin Configuration
TOP VIEW
OUT 1 AVDD 2 8 7 SET SCL SDA HV
MAX8738
OUT SET R2 VCOM
MAX8738
VDD 3 6 5 GND 4
MAX
Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. 1
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
EEPROM-Programmable TFT VCOM Calibrator with I2C Interface MAX8738
ABSOLUTE MAXIMUM RATINGS
VDD, SET, SCL, SDA to GND....................................-0.3V to +6V OUT to GND ...........................................................-0.3V to +18V AVDD, HV to GND ..................................................-0.3V to +30V Continuous Power Dissipation 8-Pin MAX (derate 4.5mW/ C above +70C) ............362mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10s) .................................+300C
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 in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VAVDD = 15V, VHV = 20V, VOUT = 6.75V, RSET = 30.1k, TA = 0C to +85C, unless otherwise noted.) (Figure 1)
PARAMETER SINK CURRENT ADJUSTMENT SET Voltage Resolution SET Differential Nonlinearity SET Zero-Scale Error SET Full-Scale Error SET Current SET External Resistance (Note 1) VSET/VAVDD Voltage Ratio 2-WIRE INTERFACE Logic-Input Low Voltage Logic-Input High Voltage Logic-Output Low Sink Current Logic-Input Current SDA and SCL Input Capacitance SCL Frequency SCL High Time SCL Low Time SDA and SCL Rise Time SDA and SCL Fall Time START Condition Hold Time START Condition Setup Time Data Input Hold Time Data Input Setup Time STOP Condition Setup Time Bus Free Time Input Filter Spike Suppression VDD REGULATOR VDD Output Voltage VDD Power-On Reset Threshold VDD 4.5V < VAVDD < 20V, IVDD = 0 Rising edge, 100mV hysteresis 3.1 3.6 4.5 3.0 V V fCLK tCLH tCLL tR tF tHDSTT tSUSTT tHDDAT tSUDAT tSUSTP tBF tSP SDA, SCL (Note 2) (Note 2) (Note 2) 10% of SDA to 90% of SCL 4000 4700 0 250 4000 4700 1 VIL VIH SDA, SCL SDA, SCL SDA forced to 0.4V VSDA = +3.3V or GND, VSCL = +3.3V or GND SDA, SCL DC 4000 4700 1000 300 2.1 6 -1 5 100 +1 0.8 V V mA A pF kHz ns ns ns ns ns ns ns ns ns ns s ISET RSET To GND, VAVDD = 20V To GND, VAVDD = 4.5V DAC full scale Factory set 0.024 10 2.25 0.05 0.025 0.026 Monotonic overtemperature 7 -1 -1 -4 +1 +1 +2 +4 120 200 45.00 Bits LSB LSB LSB A k V/V SYMBOL CONDITIONS MIN TYP MAX UNITS
2
_______________________________________________________________________________________
EEPROM-Programmable TFT VCOM Calibrator with I2C Interface
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD = 15V, VHV = 20V, VOUT = 6.75V, RSET = 30.1k, TA = 0C to +85C, unless otherwise noted.) (Figure 1)
PARAMETER AVDD SUPPLY AVDD Supply Range AVDD Operating Current HV SUPPLY HV Input Voltage Range HV Power-On Reset Threshold HV Input Bias Current OUTPUT VOLTAGE OUT Leakage Current OUT Settling Time OUT Voltage Range VOUT To 0.5 LSB error band VSET + 0.5V 100 20 13 nA s V IHV VHV Rising edge, 60mV hysteresis Not in program mode (Note 3) Program mode (Note 3) During program (Note 4) 16.1 15.6 0.1 15 28.0 16.0 1 30 60 A V V VAVDD IAVDD VAVDD = 20V 4.5 25 20.0 60 V A SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX8738
ELECTRICAL CHARACTERISTICS
(VAVDD = 15V, VHV = 20V, VOUT = 6.75V, RSET = 30.1k, TA = -40C to +85C, unless otherwise noted.) (Figure 1) (Note 5)
PARAMETER SINK CURRENT ADJUSTMENT SET Differential Nonlinearity SET Zero-Scale Error SET Full-Scale Error SET Current SET External Resistance (Note 1) 2-WIRE INTERFACE Logic-Input Low Voltage Logic-Input High Voltage Logic-Output Low Sink Current Logic-Input Current SCL Frequency SCL High Time SCL Low Time SDA and SCL Rise Time SDA and SCL Fall Time ILI fCLK tCLH tCLL tR tF (Note 2) (Note 2) VIL VIH SDA, SCL SDA, SCL SDA forced to 0.4V VSDA = +3.3V or GND, VSCL = +3.3V or GND 2.1 6 -1 DC 4000 4700 1000 300 +1 100 0.8 V V mA A kHz ns ns ns ns ISET RSET To GND, VAVDD = 20V To GND, VAVDD = 4.5V 10 2.25 Monotonic overtemperature -1 -1 -4 +1 +2 +4 120 200 45.00 LSB LSB LSB A k SYMBOL CONDITIONS MIN TYP MAX UNITS
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3
EEPROM-Programmable TFT VCOM Calibrator with I2C Interface MAX8738
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD = 15V, VHV = 20V, VOUT = 6.75V, RSET = 30.1k, TA = -40C to +85C, unless otherwise noted.) (Figure 1) (Note 5)
PARAMETER START Condition Hold Time START Condition Setup Time Data Input Hold Time Data Input Setup Time STOP Condition Setup Time Bus Free Time VDD REGULATOR VDD Output Voltage VDD Power-On Reset Threshold AVDD SUPPLY AVDD Supply Range AVDD Operating Current HV SUPPLY HV Input Voltage Range HV Power-On Reset Threshold HV Input Bias Current OUTPUT VOLTAGE OUT Voltage Range VOUT VSET + 0.5V 13 V IHV VHV Rising edge, 60mV hysteresis Not in program mode (Note 3) Program mode (Note 3) During program (Note 4) 16.1 28.0 16.0 1 30 60 A V V VAVDD IAVDD VAVDD = 20V 4.5 20.0 60 V A VDD 4.5V < VAVDD < 20V, IVDD = 0 Rising edge, 100mV hysteresis 3.1 4.5 3.0 V V SYMBOL tHDSTT tSUSTT tHDDAT tSUDAT tSUSTP tBF CONDITIONS 10% of SDA to 90% of SCL MIN 4000 4700 0 250 4000 4700 TYP MAX UNITS ns ns ns ns ns ns
Note 1: Note 2: Note 3: Note 4: Note 5:
SET resistors are only checked at full scale. Guaranteed by design. Not production tested. The MAX8738 enters program mode after any valid command is received, except the AAh command. Program time lasts for 11ms. Specifications from 0C to -40C are guaranteed by design, not production tested.
tHDSTT
tR tCLH
SCL
tCLL
tF SDA VIH VIL
tHDDAT
tSUDAT
tSUSTP
tBF
Figure 1. Timing Definitions Used in the Electrical Characteristics
4
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EEPROM-Programmable TFT VCOM Calibrator with I2C Interface
Typical Operating Characteristics
(VAVDD = 9V, VHV = 18V, RSET = 24.9k, TA = +25C, unless otherwise noted.)
MAX8738
AVDD SUPPLY CURRENT vs. TEMPERATURE
MAX8738 toc01
FULL-SCALE IOUT vs. RSET
VAVDD = 20V FULL-SCALE IOUT (A) 100
MAX8738 toc02
IOUT SINK-CURRENT ERROR vs. VAVDD
MAX8738 toc03
25 VAVDD = 9V AVDD SUPPLY CURRENT (A)
1000
0.5 IOUT SINK-CURRENT ERROR (LSB)
0.4
20
10
VAVDD = 4.5V
0.3
0.2
1
0.1
15 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
0.1 0.1 1 10 RSET (k) 100 1000
0 4 8 12 VAVDD (V) 16 20
IOUT SINK-CURRENT ERROR vs. VOUT
MAX8738 toc04
IOUT SINK-CURRENT ERROR vs. TEMPERATURE
MAX8738 toc05
TOTAL UNADJUSTED ERROR vs. DAC SETTING
0.4 TOTAL UNADJUSTED ERROR (LSB) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 0 16 32 48 64 80 96 112 128 DAC SETTING
MAX8738 toc06
0.5 IOUT SINK-CURRENT ERROR (LSB)
0.5 IOUT SINK-CURRENT ERROR (LSB)
0.5
0.4
0.4
0.3
0.3
0.2
0.2
0.1 VAVDD = 9V 0 0.1 1 VOUT (V) 10
0.1 VAVDD = 9V 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
INTEGRAL NONLINEARITY vs. DAC SETTING
MAX8738 toc07
DIFFERENTIAL NONLINEARITY vs. DAC SETTING
0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5
MAX8738 toc08
0.5 0.4 INTEGRAL NONLINEARITY (LSB) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 0 16 32 48 64 80 96
0.5 DIFFERENTIAL NONLINEARITY (LSB)
112 128
0
16
32
48
64
80
96
112 128
DAC SETTING
DAC SETTING
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5
EEPROM-Programmable TFT VCOM Calibrator with I2C Interface MAX8738
Typical Operating Characteristics (continued)
(VAVDD = 9V, VHV = 18V, RSET = 24.9k, TA = +25C, unless otherwise noted.)
AVDD POWER-UP RESPONSE
MAX8738 toc09
AVDD POWER-DOWN RESPONSE
MAX8738 toc10
SINGLE LSB STEP-UP RESPONSE
MAX8738 toc11
9V A 0 B C 0 0 D
9V A 3.6V 4V B C C 325mV D D 0 0 A B
0 20s/div A. VAVDD, 5V/div B. VOUT, 2V/div C. VDD, 2V/div D. VSET, 0.2V/div
0 5ms/div A. VAVDD, 5V/div B. VOUT, 2V/div C. VDD, 2V/div D. VSET, 0.2V/div A. SCL, 5V/div B. SDA, 5V/div 50s/div C. VSET, 5mV/div D. VOUT, 5mV/div
SINGLE LSB STEP-DOWN RESPONSE
MAX8738 toc12
WRITE 00H RESPONSE
MAX8738 toc13
WRITE FFH RESPONSE
MAX8738 toc14
0 0
A B
0 0 3.95V
A B
0 0 3.95V
A B
C 3.45V C 400mV D D 0 50s/div A. SCL, 5V/div B. SDA, 5V/div C. VSET, 5mV/div D. VOUT, 5mV/div A. SCL, 5V/div B. SDA, 5V/div 50s/div C. VOUT, 500mV/div D. VSET, 200mV/div A. SCL, 5V/div B. SDA, 5V/div 0 50s/div C. VOUT, 500mV/div D. VSET, 200mV/div 3.45V 450mV
C
D
6
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EEPROM-Programmable TFT VCOM Calibrator with I2C Interface
Pin Description
PIN 1 2 3 4 5 6 7 NAME OUT AVDD VDD GND HV SDA SCL FUNCTION Adjustable Sink-Current Output. OUT connects to the resistive voltage-divider between AVDD and GND that sets the VCOM voltage. IOUT lowers the divider voltage by an adjustable amount. See the SET pin description. High-Voltage Analog Supply. Bypass to GND with a 0.1F capacitor. 3.6V Regulator Output. VDD provides the supply voltage to the entire IC. VDD is not for external use. Bypass to GND with a 0.1F capacitor. Ground. Connect to system ground. EEPROM High-Voltage Programming Supply. Bypass to GND with a 0.1F capacitor. Connect this pin to the TFT LCD VGON supply. VGON should be between 16.1V and 28V. The HV pin supplies the power for the internal EEPROM writing cycle. The internal writing circuits are disabled when HV is less than 15.6V (typ). I2C-Compatible Clock Input I2C-Compatible Serial Bidirectional Data Line Full-Scale Sink-Current Adjustment Input. Connect a resistor, RSET, from SET to GND to set the full-scale adjustable sink current. The full-scale adjustable sink current is equal to: 8 SET
MAX8738
V AVDD 20 x RSET
IOUT is equal to the current through RSET.
VGON 0.1F +3.3V 0.1F
2 x 3.9k
VDD
HV AVDD
AVDD
0.1F
SDA I 2C BUS SCL GND RSET 24.9k
MAX8738
OUT SET
R1 64.9k
R2 51.1k
VCOM
Figure 2. Standard Application Circuit
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7
EEPROM-Programmable TFT VCOM Calibrator with I2C Interface MAX8738
+3.3V VDD AVDD
LINEAR REGULATOR 19R
AVDD
MAX8738
SDA I2C BUS SCL OUT I2C CONTROL INTERFACE 7 DAC R
R1
R2
VCOM
7 VGON HV EEPROM BLOCK
SET RSET GND
Figure 3. Simplified Functional Diagram
Detailed Description
The MAX8738 is a solid-state alternative to mechanical potentiometers used for adjusting the LCD backplane voltage (VCOM) in TFT LCD displays. The MAX8738 attaches to an external resistive voltage-divider and sinks a programmable current (IOUT), which sets the VCOM level (Figure 2). An internal 7-bit DAC controls the sink current and allows the user to increase or decrease the VCOM level (Figure 3). The DAC is ratiometric relative to VAVDD and is monotonic over all operating conditions. The user can store the DAC setting in an internal EEPROM. On power-up, the EEPROM presets the DAC to the last stored setting. The 2-wire I2C interface between the LCD panel and the programming circuit adjusts the DAC and programs the EEPROM. The resistive voltage-divider and the AVDD supply set the maximum value of VCOM. The MAX8738 sinks current from the voltage-divider to reduce the VCOM level. The external resistor RSET sets the full-scale sink current and the minimum value of VCOM.
HV The HV input provides the high voltage required to program the EEPROM. The HV pin is typically connected to the TFT LCD positive gate driver supply (VGON) supply. VGON should be between 16.1V and 28V. EEPROM programming is disabled when HV is below 15.6V (typ). Bypass HV to GND with a 0.1F capacitor. The EEPROM programming block is turned off when the MAX8738 first powers up, and also immediately after the EEPROM is programmed. When the EEPROM programming block is off, the HV supply current is less than 1A. After the MAX8738 receives any command that changes the DAC value, the EEPROM programming block is enabled, and the HV supply current increases to 15A (typ). During the programming of the EEPROM, the HV supply current may draw up to 60A (max).
Setting the VCOM Adjustment Range (RSET)
The external resistive voltage-divider sets the maximum value of the VCOM adjustment range. RSET sets the full-scale sink current, IOUT, which determines the minimum value of the VCOM adjustment range. Large RSET values increase resolution but decrease the VCOM adjustment range. Calculate R1, R2, and RSET using the following procedure:
Supply Voltages
AVDD and VDD The MAX8738 has an internal linear regulator that generates a 3.6V VDD voltage from the AVDD supply voltage. The VDD voltage supplies power to the MAX8738 and should not be used for external loads. AVDD accepts voltages from 4.5V to 20V. Bypass AVDD and VDD to GND with a 0.1F capacitor each.
8
_______________________________________________________________________________________
EEPROM-Programmable TFT VCOM Calibrator with I2C Interface
1) Choose the maximum VCOM level (VMAX), the minimum VCOM level (V MIN), and the AVDD supply voltage (VAVDD). 2) Select R1 between 10k and 500k based on the acceptable power loss from the AVDD supply rail. 3) Calculate R2: R2 4) Calculate RSET:
RSET = VMAX 20 x (VMAX - VMIN ) x R1
7) The resulting resolution is: (VMAX - VMIN ) 127 A complete design example is given below: 1) VMAX = 5V, VMIN = 3V, VAVDD = 10V.
MAX8738
VMAX (VAVDD - VMAX )
x R1
2) If R1 = 200k, then R2 = 200k and RSET = 24.9k. 3) ISET(MAX) = 20A. 4) Resolution = 15.75mV.
Translating Existing Potentiometer Circuits
Existing VCOM adjustment circuits using conventional mechanical potentiometers can be translated into MAX8738 circuits. Figures 4 and 5 show two common adjustment circuits and their equivalent MAX8738 circuits.
5) Verify that ISET(MAX) does not exceed 120A: ISET(MAX) = VAVDD 120A 20 x RSET
6) If ISET exceeds 120A, return to step 2 and choose a larger value for R1.
MECHANICAL POTENTIOMETER AVDD MAX8738 EQUIVALENT CIRCUIT
RA AVDD RB VCOM AVDD
MAX8738
RC R1 = RA R2 = RB + RC R x (RB + RC) RSET = A 20 x RB OUT GND RSET SET
R1
R2
VCOM
Figure 4. Replacement of Mechanical Potentiometer Circuit
_______________________________________________________________________________________
9
EEPROM-Programmable TFT VCOM Calibrator with I2C Interface MAX8738
MECHANICAL POTENTIOMETER AVDD MAX8738 EQUIVALENT CIRCUIT
RD AVDD RE VCOM AVDD
MAX8738
RF R1 = RD R2 = RF RSET = RD x (RD + RE + RF) 20 x RE GND RSET OUT SET
R1
R2
VCOM
Figure 5. Replacement of Mechanical Potentiometer Circuit
Applications Information
I2C-Bus-Compatible Interface
The MAX8738 is a receive-only device with an I 2 C address of 5Eh. The 2-wire, I2C-bus-compatible serial interface (pins SCL and SDA) is designed to attach to a I2C bus. Connect both SCL and SDA lines to the positive bus supply through individual pullup resistors. Calculate the required value of the pullup resistors using: RPULLUP tR CBUS
The MAX8738 is compatible with the standard I2C interface protocol as defined in the following subsections. See Figure 6. Bus Not Busy The I2C bus is not busy when both data and clock lines remain HIGH. Data transfers may be initiated only when the bus is not busy. START Data Transfer (S) Starting from an idle bus state (both SDA and SCL are high), a START condition consists of a HIGH to LOW transition of the SDA line while the clock (SCL) is HIGH. All commands must be preceded by a START condition. STOP Data Transfer (P) A STOP condition consists of a LOW to HIGH transition of the SDA line while the clock (SCL) is HIGH. All operations must be ended with a STOP condition.
where t R is the rise time in the Electrical Characteristics, and CBUS is the total capacitance on the bus.
SDA
SCL
S START CONDITION
DATA LINE STABLE DATA VALID
CHANGE OF DATA ALLOWED
P STOP CONDITION
Figure 6. I2C Bus START, STOP, and Data Change Conditions 10 ______________________________________________________________________________________
EEPROM-Programmable TFT VCOM Calibrator with I2C Interface
Slave Address After generating a START condition, the bus master transmits the slave address consisting of a 7-bit device code (0b0101111 or 5Eh) for the MAX8738. Since the MAX8738 is a write-only device, the eighth bit of the slave address is zero. The MAX8738 monitors the bus for its corresponding slave address continuously. It generates an acknowledge bit when it recognizes its address. SDA Data Valid The state of the data line represents valid data when, after a START condition, the data line is stable for the duration of the HIGH period of the clock signal. The data on the line must be changed during the LOW period of the clock signal. There is one clock pulse per bit of data. Acknowledge Each receiving device, when addressed, is obliged to generate an acknowledge after the reception of each byte. The master device must generate an extra clock pulse that is associated with this acknowledge bit. The device that acknowledges has to pull down the SDA line during the acknowledge clock pulse so that the SDA line is stable LOW during the HIGH period of the acknowledge-related clock pulse. Of course, setup and hold times must be taken into account. See Figure 7. The MAX8738 does not acknowledge the program EEPROM command (AAh) if HV is below 15.6V (typ) or if the MAX8738 is not in program mode. The MAX8738 does not acknowledge any command while an internal programming cycle is in progress. Once the internally timed EEPROM write cycle has started, acknowledge polling can be initiated. This involves repeatedly sending a 55h command. Only if the internal write cycle has completed does the MAX8738 acknowledge the command.
MAX8738
DATA OUTPUT BY MASTER
D7
D6
D0
NOT ACKNOWLEDGE DATA OUTPUT BY MAX8738
ACKNOWLEDGE SCL FROM MASTER 1 S START CONDITION CLK1 2 CLK2 8 CLK8 9 CLK9
ACKNOWLEDGE CLOCK PULSE
Figure 7. I2C Bus Acknowledge
______________________________________________________________________________________
11
EEPROM-Programmable TFT VCOM Calibrator with I2C Interface MAX8738
Table 1. Command Byte Functions
BYTE 00h FFh AAh 55h 11h FUNCTION Decrement the DAC setting by 1 LSB Increment the DAC setting by 1 LSB Write the current DAC setting to EEPROM Load the EEPROM setting to the DAC Write a specific value to the DAC FIGURE 8A 8A 8A 8A 8B
Table 2. DAC Settings
DAC VALUE FFh FEh . . . 01h 00h ISET ISET(MAX) ISET(MAX) 1 LSB . . . ISET(MIN) + 1 LSB ISET(MIN) VSET (V) VSET(MAX) VSET(MAX) 1 LSB . . . VSET(MIN) + 1 LSB VSET(MIN) VOUT (V) VMIN VMIN + 1 LSB . . . VMAX 1 LSB VMAX
Command Byte A complete command consists of a START condition (S) followed by the MAX8738's slave address (5Eh) and a command byte, or a command byte and a DAC value, followed by a STOP condition (P). There are five commands, and their functions are listed in Table 1. DAC Values Table 2 lists the DAC values and the corresponding ISET, VSET, and VOUT values.
3) Bypass V DD and AVDD with 0.1F capacitors placed close to the IC with short connections to the pins. 4) Refer to the MAX8738 evaluation kit for an example of proper board layout.
Layout Information
Use the following guidelines for good layout: 1) Place the VCOM buffer and the R1/R2 voltagedivider close to the OUT pin (Figure 2). 2) Place RSET close to SET.
Chip Information
TRANSISTOR COUNT: 6198 PROCESS: BiCMOS
START
STOP
S
SLAVE ADDRESS
COMMAND BYTE
P
ACK (A) FOR THE 00H, FFH, AAH, AND 55H COMMANDS
ACK
START
STOP
S
SLAVE ADDRESS
SET DAC VALUE (11H)
DAC VALUE
P
ACK (B) FOR THE DAC INITIAL VALUE-SETTING COMMAND
ACK
ACK
Figure 8. I2C Bus Data Transfer Summary
12
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EEPROM-Programmable TFT VCOM Calibrator with I2C Interface
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
MAX8738
8
4XS
8
INCHES DIM A A1 A2 b c D e E H MIN 0.002 0.030 MAX 0.043 0.006 0.037
MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95
O0.500.1
E
H
0.60.1
1
0.60.1
1
D
L
S
BOTTOMVIEW
0.010 0.014 0.005 0.007 0.116 0.120 0.0256BSC 0.116 0.120 0.188 0.198 0.016 0.026 0 6 0.0207BSC
0.25 0.36 0.13 0.18 2.95 3.05 0.65BSC 2.95 3.05 4.78 5.03 0.41 0.66 0 6 0.5250BSC
TOPVIEW
A2
A1
A
e
c b L
SIDEVIEW
FRONTVIEW
PROPRIETARYINFORMATION TITLE:
PACKAGEOUTLINE,8LuMAX/uSOP
APPROVAL DOCUMENTCONTROLNO. REV.
21-0036
J
1 1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
8LUMAXD.EPS

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