LG KU580 Service Manual - Page 36

3. Technical Brief 3.1.12 MicroSD Interface card KU580 supports the MicroSD card interface as external memory card. MicroSD card has 4-data line, so KU580 uses 4-data line. All control and data line is connected to Asta. Cause of the difference between Asta and MicroSD card, a level shifter should be added. MICROSD_DETECT MICROSD_CMD MICROSD_CLK MICROSD_DAT VDDG27 MicroSD card Interface Card detection, connected to GPIO47 of Asta Command/Response Clock Data line Supply voltage from Veronica internal LDO Table 3-1-7. MicroSD card Interface • Card detection - When there are no card in MicroSD card socket, MICROSD_DETECT pin is high cause of an external pull-up. - If card is inserted in socket, MICROSD_DETECTpin changes Low cause of the mechanical switch in the socket. - VDDG27 always supply power. - If card is removed, MICROSD_DETECT pin changes high. ACC_GP17_MC_SELECT VDDE_1V8 R400 100K R404 0 Q400 C OUT B IN RN1107 E GND MICROSD_DAT0 MICROSD_DAT1 MICROSD_DAT2 MICROSD_DAT3 MICROSD_CMD MICROSD_CLK APP_GP13_MC_CLKRET MICROSD_DAT_DIR MICROSD_CMD_DIR R405 10K R406 51K R407 51K R408 51K R409 51K VDDE_1V8 VDDG_2V85 R419 0 U400 E4 _CS0 G4 _CS1 A5 MODE1 B5 MODE0 B3 1A A2 2A B2 3A D2 4A G2 5A E2 6A F1 7A F2 8A C1 9A B1 10A1 C2 10A2 G3 11A F3 12A F4 13A B4 1DIR A4 2DIR C4 3DIR A3 4DIR D3 56DIR E1 78DIR D1 9DIR SN74AVCA406ZQCR A1 VCCA0 G1 VCCA1 A7 VCCB0 G7 VCCB1 B7 1B C6 2B C7 3B D5 4B F6 5B G6 6B F5 7B G5 8B B6 9B1 E7 9B2 A6 10B1 E6 10B2 D6 11B D7 12B F7 14B C5 GND1 D4 GND2 E3 GND3 E5 GND4 R420 NA C401 0.1u C402 4.7u R410 10K R411 NA R412 51K R413 51K R414 51K R415 NA R416 51K C403 4.7u C404 0.1u R421 NA R422 51K MICROSD_DAT0_27 MICROSD_DAT1_27 MICROSD_DAT2_27 MICROSD_DAT3_27 MEGASIM_DAT0_27 MICROSD_CMD_27 MEGASIM_CMD_27 MICROSD_CLK_27 MEGASIM_CLK_27 MicroSD Level Shifter Figure 3-1-12. MicroSD card and Schematic of MicroSD card Interface Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 37 - LGE Internal Use Only