Vizio VTAB1008
The Vizio VTAB1008 is a commercially available tablet in the USA.
Overview
The Vizio VTAB1008 is almost identical to the XO-3, from a software point of view. It uses the Marvell Armada 610 and provides 512MB of memory and 4GB of eMMC storage.
Display
The display size is 8" diagonal w. 4:3 aspect ratio. The resolution is 1024x768.
There are three internal speakers, independently wired, and an internal mono microphone. The speakers are configured to provide stereo in either portrait or landscape mode.
Connectivity
The VTAB has 802.11b/g WiFi and Bluetooth, using a single antenna.
Location/Movement
The VTAB has both full GPS and an accelerometer.
Ports
- One USB OTG
- One mini HDMI output
- One microSD card, externally accessible (pry out the tab on the bottom edge near the USB/HDMI. ports)
Power
The VTAB has a 22Wh Li-Ion polymer battery.
It consumes roughly 3.9W while idling, 4.5W while recording video, and 6.2W peak, from the battery.
It generally pulls around 7W from the adapter while charging.
The Vmain voltage to the SoC (on the unit tested) is 1.4V at full voltage, around 1.25V in a low power mode, and finally around 1.0V for idle. It jumps between voltages constantly, indicating full voltage/frequency scaling.
Breakdown
The tablet first breaks down into a bottom half containing the vast majority of the electronics and a top half consisting of the sandwich of touchscreen and display:
Electrically, the tablet consists of a main PCB, two auxiliary PCBs, and the display sandwich.
Height
The tablet thickness is roughly 12.8mm in the middle. The height stackup is:
| Cover Glass: 1.0mm | |
| Touchscreen: 0.9mm | |
| Air Gap: 0.8mm | |
| Display: 3.7mm | |
| Swell gap: 0.4mm | Main PCB: 4.8mm |
| Battery: 4.7mm | |
| Back cover: 1.3mm | |
The touchscreen is a multitouch projected capacitance screen, built with two layers of ITO on the piece of glass mounted inside of the cover glass (not quite single glass technology). An insulating material is placed between the two layers when they cross. The insulating material can be seen as a grid of dots when held at the wrong angle in sunlight. The air gap is created by a rim of black foam, 0.8mm in height, placed right outside the active area of the display (mostly on the bezel).
The back cover has a cheap cast metal heat spreader, bonded to the outer plastic shell.
Weight
The tablet weight is roughly 580 grams. This breaks down as:
| Cover Glass/Bezel: | 147g |
| Display: | 179g |
| Main PCB: | 45g |
| Battery: | 116g |
| Back cover and side PCBs: | 94g |
| Total: | 581g |