Apalis Carrier Board Design Guide - Toradex

Apalis Carrier Board Design Guide2.7.3 Reference SchematicsSome displays feature an I 2 C interface for reading out the EDID PROM or additional controls suchas contrast and hue. If the carrier board provides no other display interface with DDC, the I2C2interface should be used. If the DDC is used, make sure that I 2 C device(s) on the LVDS display doesnot interfere with the DDC address 50h. Otherwise, a different I 2 C interface should be used. TheI 2 C interfaces on the Apalis module are 3.3V logic level. If the display requires a 5V interface, addan I 2 C logic level shifter.X1O246 LVDS1_A_CLK_NLVDS1_A_CLK-248 LVDS1_A_CLK_PLVDS1_A_CLK+252 LVDS1_A_TX0_NLVDS1_A_TX0-254 LVDS1_A_TX0_PLVDS1_A_TX0+258 LVDS1_A_TX1_NLVDS1_A_TX1-260 LVDS1_A_TX1_PLVDS1_A_TX1+264 LVDS1_A_TX2_NLVDS1_A_TX2-266 LVDS1_A_TX2_PLVDS1_A_TX2+270 LVDS1_A_TX3_NLVDS1_A_TX3-272 LVDS1_A_TX3_PLVDS1_A_TX3+276 LVDS1_B_CLK_NLVDS1_B_CLK-278 LVDS1_B_CLK_PLVDS1_B_CLK+282 LVDS1_B_TX0_NLVDS1_B_TX0-284 LVDS1_B_TX0_PLVDS1_B_TX0+288 LVDS1_B_TX1_NLVDS1_B_TX1-290 LVDS1_B_TX1_PLVDS1_B_TX1+294 LVDS1_B_TX2_NLVDS1_B_TX2-296 LVDS1_B_TX2_PLVDS1_B_TX2+300 LVDS1_B_TX3_NLVDS1_B_TX3-302 LVDS1_B_TX3_PLVDS1_B_TX3+Apalis - Dual Channel LVDS15 of 25MM70-314-310B1X1LMXM3_239BKL1_PWM 239R1243LCD1_PCLK245LCD1_VSYNC247LCD1_HSYNC249LCD1_DE286 MXM3_286 R2BKL1_ON251LCD1_R0253LCD1_R1255LCD1_R2257LCD1_R3259LCD1_R4261LCD1_R5263LCD1_R6265LCD1_R7269LCD1_G0271LCD1_G1273LCD1_G2275LCD1_G3277LCD1_G4279LCD1_G5281LCD1_G6283LCD1_G7287LCD1_B0289LCD1_B1291LCD1_B2293LCD1_B3295LCD1_B4297LCD1_B5299LCD1_B6301LCD1_B7Apalis - Digital RGB12 of 25MM70-314-310B122R22RPWM_BKL1BKL1_ON3.3V3.3V2C1100nF16V 1R8 R91.8K 1.8KGNDI2C2_SCL3I2C2_SDA4I2C2_DDC[0..1]5VIC1100KR57VREF1 VREF2R68 1.8KGND ENC216V100nFGND6SCL1 SCL25SDA1 SDA2PCA9306DCTTLCD[0..1]3.3V_LVDS15V_LVDS1JP33.3V_LVDS132V_DDC5V_LVDS115V V_DDCJP1123R3100KGNDJP2123R4100KGNDR71.8K220R@100MHzR10 L2I2C2_DDC_SCL_C500mA22RR11 L4I2C2_DDC_SDA_C500mA22R 220R@100MHzC5 C64.7pF 4.7pFGNDLVDS1[0..19]X2LVDS1_A_TX3_P 1LVDS1_A_TX3+LVDS1_A_TX3_N 3LVDS1_A_TX3-LVDS1_A_TX2_P 7LVDS1_A_TX2+LVDS1_A_TX2_N 9LVDS1_A_TX2-LVDS1_A_TX1_P 13LVDS1_A_TX1+LVDS1_A_TX1_N 15LVDS1_A_TX1-LVDS1_A_TX0_P 19LVDS1_A_TX0+LVDS1_A_TX0_N 21LVDS1_A_TX0-LVDS1_A_CLK_P 25LVDS1_A_CLK+LVDS1_A_CLK_N 27LVDS1_A_CLK-LVDS1_B_CLK_N 4LVDS1_B_CLK-LVDS1_B_CLK_P 6LVDS1_B_CLK+LVDS1_B_TX0_N 10LVDS1_B_TX0-LVDS1_B_TX0_P 12LVDS1_B_TX0+LVDS1_B_TX1_N 16LVDS1_B_TX1-LVDS1_B_TX1_P 18LVDS1_B_TX1+LVDS1_B_TX2_N 22LVDS1_B_TX2-LVDS1_B_TX2_P 24LVDS1_B_TX2+LVDS1_B_TX3_N 28LVDS1_B_TX3-LVDS1_B_TX3_P 30LVDS1_B_TX3+PWM_BKL1 35BL CRTLBKL1_ON 37BL ONLVDS1_SEL_1 31SEL 1 (3.3V - 5V)LVDS1_SEL_2 33SEL2 (GND - 3.3V)I2C2_DDC_SDA_C 36SDAI2C2_DDC_SCL_C 38SCL323.3V_LVDS1 3.3V LVDS345V_LVDS1 5V LVDS3912V_LVDS1 12V LVDS4012V_LVDS1 12V LVDSDF13A-40DP-1.25v(55)1.25mm pitch Connector2GND5GND8GND11GND14GND17GND20GND23GND26GND29GNDI2C2_DDC_C[0..1]GNDPowerL13.3V 2A3.3V_LVDS1220R@100MHzC3100nF16VGNDL35V 2A5V_LVDS1220R@100MHzC4100nF16VGNDL512V 2A12V_LVDS1220R@100MHzC7100nF16VX1YApalis - Display DDCI2C2_SDAI2C2_SCL205 MXM3_205 R12 22R I2C2_SDA207 MXM3_207 22R I2C2_SCLR13GNDMM70-314-310B125 of 25Figure 38: 24-bit Dual channel LVDS display reference schematic2.7.4 Unused LVDS Interface Signal TerminationAll unused LVDS interface signals can be left unconnected.2.8 HDMI/DVIThe HDMI and DVI interface uses a TMDS compatible physical link to transfer video and optionalaudio data. Electrically, HDMI and DVI are equal, but there can be some differences in theprotocol. HDMI is the successor of DVI and specifies the additional transport for audio data andcontent protection (HDCP). HDMI devices (monitor, television set etc.) can be driven with the DVIinterface as HDMI is backward compatible. Compatibility is not guaranteed when attempting todrive a DVI device with an HDMI interface. Not all DVI displays accept the HDMI protocol or areHDCP compatible. Please read the datasheet of the Apalis module for more information about thesupported HDMI and DVI protocols.Toradex AG l Altsagenstrasse 5 l 6048 Horw l Switzerland l +41 41 500 48 00 l www.toradex.com l info@toradex.com Page | 41