PDF MAX9669 Data sheet ( Hoja de datos )

Número de pieza	MAX9669
Descripción	10-Bit Programmable Gamma Reference System
Fabricantes	Maxim Integrated
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No Preview Available ! 19-4326; Rev 4; 8/11 10-Bit Programmable Gamma Reference System with MTP for TFT LCDs General Description The MAX9669 outputs 16 voltage references for gamma correction in TFT LCDs and one voltage reference for VCOM. Each gamma reference voltage has its own 10- bit digital-to-analog converter (DAC) and buffer to ensure a stable voltage. The VCOM reference voltage has its own 10-bit DAC and an amplifier to ensure a sta- ble voltage when critical levels and patterns are dis- played. The MAX9669 features integrated multiple-time programmable (MTP) memory to store gamma and VCOM values on the chip, eliminating the need for exter- nal EEPROM. The MAX9669 supports up to 100 write operations to the on-chip nonvolatile memory. The gamma outputs can drive 200mA peak transient current and settle within 1µs. The VCOM output can provide 600mA peak transient current and also settles within 1µs. The analog supply voltage range extends from 9V to 20V, and the digital supply voltage range extends from 2.7V to 3.6V. Gamma values and the VCOM value are programmed into registers through the I2C interface. TFT LCDs Applications Pin Configuration TOP VIEW 21 20 19 18 17 16 15 GMA9 22 GMA10 23 GMA11 24 GMA12 25 GMA13 26 GMA14 27 GMA15 28 + MAX9669 EP* 14 GMA3 13 GMA2 12 GMA1 11 AGND 10 AVDD 9 AVDD_AMP 8 VCOM_FB 1 234567 THIN QFN (5mm × 5mm) EP = EXPOSED PAD, CONNECT EP TO DIGITAL GROUND PLANE. Features o 16-Channel Gamma Correction, 10-Bit Resolution o VCOM Driver o Integrated MTP Memory o Programmable VCOM Limits o 200mA Peak Current on Gamma Channels o 600mA Peak Current on VCOM Channel o 1µs Settling Time Ordering Information PART MAX9669ETI+ MAX9669ETI/V+ TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 28 TQFN-EP 28 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. /V denotes an automotive qualified part. Functional Diagram AVDD MTP MEMORY DVDD SDA SCL A0 DGND 10 10 10 10 10 10 10 10 I2C REGISTERS 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 DAC 10 REGISTERS 10 10 10 10 10 10 10 10 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC 10-BIT DAC I2C INTERFACE MAX9669 AGND GMA1 GMA2 GMA3 GMA4 GMA5 GMA6 GMA7 GMA8 GMA9 GMA10 GMA11 GMA12 GMA13 GMA14 GMA15 GMA16 AVDD_AMP VCOM AGND_AMP VCOM_FB ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 page 10-Bit Programmable Gamma Reference System with MTP for TFT LCDs Typical Operating Characteristics (VAVDD = VAVDD_AMP = 18V, VDVDD = 3.3V, VAGND = VAGND_AMP = VDGND = 0, no load, unless otherwise noted. Typical values are at TA = +25°C.) OUTPUT OFFSET-VOLTAGE DISTRIBUTION 30 25 20 15 10 5 0 -40 -30 -20 -10 0 10 20 30 40 OUTPUT OFFSET (mV) GAMMA LOAD REGULATION 20 15 10 5 0 -5 -10 -15 -20 -20 -15 -10 -5 0 5 10 15 20 LOAD CURRENT (mA) VCOM LOAD REGULATION 60 40 20 0 -20 -40 -60 -150 -100 -50 0 50 100 LOAD CURRENT (mA) 150 0.25 0.20 0.15 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 -0.25 0 DNL GAMMA 128 256 384 512 640 768 896 1024 CODE (UNITS) 0.25 0.20 0.15 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 -0.25 0 DNL VCOM 128 256 384 512 640 768 896 1024 CODE (UNITS) _______________________________________________________________________________________ 5 5 Page 10-Bit Programmable Gamma Reference System with MTP for TFT LCDs Table 2. Register Map REGISTER ADDRESS 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1D 0x1E REGISTER NAME GMA1 GMA2 GMA3 GMA4 GMA5 GMA6 GMA7 GMA8 GMA9 GMA10 GMA11 GMA12 GMA13 GMA14 GMA15 GMA16 Reserved Reserved VCOM Reserved Reserved Reserved Reserved Reserved VCOMMIN VCOMMAX Reserved, DO NOT WRITE Reserved, DO NOT WRITE REGISTER DESCRIPTION Gamma 1 Gamma 2 Gamma 3 Gamma 4 Gamma 5 Gamma 6 Gamma 7 Gamma 8 Gamma 9 Gamma 10 Gamma 11 Gamma 12 Gamma 13 Gamma 14 Gamma 15 Gamma 16 — — Common voltage — — — — — Minimum VCOM value Maximum VCOM value — — MTP FACTORY INITIALIZATION VALUE 0x200 0x200 0x200 0x200 0x200 0x200 0x200 0x200 0x200 0x200 0x200 0x200 0x200 0x200 0x200 0x200 — — 0x200 — — — — — 0x000 0x3FF — — READ/WRITE Read and write Read and write Read and write Read and write Read and write Read and write Read and write Read and write Read and write Read and write Read and write Read and write Read and write Read and write Read and write Read and write — — Read and write — — — — — Read and write Read and write — — lowed by the slave address with the R/W bit set to 1. The MAX9669 transmits the contents of the specified register. Transmitted data is valid on the rising edge of the master-generated serial clock (SCL). The address pointer autoincrements after every other read data byte. This autoincrement feature allows all registers to be read sequentially within one continuous frame. A STOP condition can be issued after any number of read data bytes. If a STOP condition is issued followed by another read operation, the first data byte to be read is from the register address location set by the previous transac- tion and not 0x00. Subsequent reads autoincrement the address pointer until the next STOP condition. Attempting to read from register addresses higher than 0x1E results in repeated reads from a dummy register containing all one data. The master acknowledges receipt of each read byte during the acknowledge clock pulse. The master must acknowledge all correctly received bytes except the last byte. The final byte must be followed by a not acknowledge from the master and then a STOP condition. Figures 6 and 7 illustrate the frame format for reading data from the MAX9669. ______________________________________________________________________________________ 11 11 Page

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