{"id":98,"date":"2010-08-28T22:58:24","date_gmt":"2010-08-29T05:58:24","guid":{"rendered":"http:\/\/blog.11h.net\/?p=98"},"modified":"2010-12-10T17:41:14","modified_gmt":"2010-12-11T01:41:14","slug":"augen-gentouch-78-android-tablet","status":"publish","type":"post","link":"https:\/\/11h.net\/blog\/augen-gentouch-78-android-tablet\/","title":{"rendered":"Augen Gentouch 78 Android Tablet"},"content":{"rendered":"

I picked up an Augen Gentouch 78<\/a> Android tablet the second that I heard they even exist from, of all places, K-Mart.? I guess I was lucky to find one in stock on August 10th since they were apparently in such high demand.<\/p>\n

Now, from reading forums and reviews online before hand, I knew what I was getting myself in to.? The thing has its share of problems, although most of the annoyances are currently incomplete software.? Considering that I was wanting to build my own Android tablet\/in-wall PC for over a year, I jumped on this because of it’s low price.<\/p>\n

I decided to crack the case open to see exactly what was on the inside, and to see how easy it would be to hack should I decide to add functionality to it.? After struggling with those pesky, fragile plastic clips, I finally got the back off (click any picture for large size):<\/p>\n

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As can be seen, I guess I got lucky and received a 2100mAh battery.? With the version 3 Augen update, my battery indicator no longer goes to 100%, but it still seems to hold a charge for a good 4+ hours of moderate use.<\/p>\n

The main board appears to be partitioned (by ground rings) into 4 sections:? Wireless (top-left), Unknown (top-right), Power Supply (middle), and CPU (bottom).? I tried to take notes of the markings on all the major chips.<\/p>\n

First is the WiFi chip in the top-left.? It appears to be labeled “ROCm \/ ATHEROS \/ AR610ZG-BMZD \/ E022410-51C \/00880068 \/1009 PHIL”, clearly indicating an Atheros WiFi chipset.<\/p>\n

Next, in the power supply section, is an 8-pin IC near the power button labeled “RT8272 \/ GSPCCW03”.? Searching indicates a high voltage buck converter.? Some people indicate that the USB port is incapable of charging the 8.4V battery because USB is limited to 5V\/500mA.? This buck converter’s datasheet<\/a> indicates an input voltage rage between 4.75V – 24V and a configurable output range of 0.92V to 15V.? I didn’t do any testing (perhaps I should have), but it’s quite possible to speculate that they could be boosting the USB voltage levels here to (attempt to) charge the battery.? My suspicion is this:? If the battery typically only lasts 4 hours on a 2100mAh battery, that tells me the unit probably draws about 525mA during operation.? That’s clearly over USB’s limit of 500mA, which would explain extended battery life, but not actually charging the battery.? One test that should be done is to see if the battery indeed charges via USB while the unit is powered off or in sleep mode.<\/p>\n

\"\"<\/a>There is another 8-pin IC on the middle of the power supply section near the LCD connector labeled “020L1\/ 8057Q”.? I couldn’t find any info on this chip.<\/p>\n

The far right 32-pin IC near the LCD connector appears to be labeled “ALC5621 \/ A4K62S1 \/ GA18C” which is an I2S\/PCM Realtek Audio Interface Codec<\/a>.? The datasheet link on Realtek’s website didn’t work, but I found another copy and uploaded it here: ALC5621<\/a>.? The datasheet clearly shows Microphone inputs, Line inputs, and Aux inputs, so it should be possible to add those features to this tablet (might require a driver\/Android change in software to use).? In particular, microphone inputs should be on pins 32, 1, 2, 4, and 5.? It’d be interesting to trace these on the PCB to see what connectors they come out of (if they even route anywhere), but with careful soldering, you could probably just tap directly to the pins.<\/p>\n

Next up is of course the CPU, which we already know is a TeleChips TCC8902.? I deciphered the additional markings as “0BX \/ AN2D6K-CN \/ 1023”.<\/p>\n

The NAND flash chip is a 16Gx8<\/a> labled “SAMSUNG 013 \/ K9GAG08U0M \/ PCB0 \/ YCC687AW”, which should be the advertised 2GB of flash in total.<\/p>\n

There are two 1Gb DDR2 SRAM<\/a> Hynix chips as well, labeled “hynix?? KOR \/ HY5PS1G1631C \/ FP-25?? 927A \/ NTHA8Z83MQ1”, which confirms 256MB of RAM total.<\/p>\n

\"\"<\/a>One chip that caught my attention was the 8-pin IC near the RAM.? It is marked as “AT88SC \/ 0104CA \/ U?? 1016” which indicates an Atmel Secure CryptoMemory<\/a> chip.? Could this be utilized by a future update from Augen to lock us out of custom Android images via the bootloader?? Is it intended to allow for a SIM card to be added?? Is it intended for some form of DRM?? It’d be interesting to see how this chip is utilized now, and in the future with more updates.? As of now, Augen has been quite generous at keeping this device developer-friendly and hackable.<\/p>\n

The three crystals by the CPU I couldn’t figure out.? Their markings are, from left to right:<\/p>\n