BUF20820EVM

BUF20820EVM BUF20800/20820EVM Features

This section describes some of the hardware features present on the BUF20800/20820 test board.3.7.1JMP1: DVDD Control SettingJumper JMP1 selects where the BUF20800 or BUF20820 digital supply pin is connected. If JMP1 is set tothe INT position, the DVDD pin is connected to the switchable VDUT signal generated from theUSB_DIG_Platform. This voltage can be set to either +3.3V or +5V depending on how JMP9 on theUSB_DIG_Platform is set. While JMP1 is set to the INT position, the DVDD Power button in theBUF20800/20820 software is able to control whether the VDUT supply voltage is turned on or off.When JMP1 is set in the EXT position, an external supply connected to terminal T1 can be used toprovide the digital supply voltage for the BUF20800 or BUF20820.3.7.2JMP2: I2C SCL Control SettingJumper JMP2 selects where the BUF20800 or BUF20820 I2C SCL pin is connected. If JMP2 is set to theINT position, the I2C clock signal is generated from the I2C_SCK_ISO signal from the USB_DIG_Platform.When JMP2 is set to the EXT position, an external source connected to SCL pin of terminal T4 can beused to provide the I2C SCK signal for the BUF20800 or BUF20820.13SBOU100–April 2011BUF20800/20820EVM User Guide and Software TutorialSubmit Documentation Feedback© 2011, Texas Instruments IncorporatedRefH = VSUP_HR2R1 + R2

BUF20820EVM Software Description and Set-Up

The BUF20800/20820EVM software allows the user to read and write to all registers in theBUF20800/20820 gamma correction buffer. Furthermore, it allows programming of the OTP register on theBUF20820. The software also permits the user to select either I2C address. Press the About button, asshown in Figure 13, to verify that you have the latest version of the software.Figure 13. BUF20800/20820EVM Software About Button