Bharat Tablet PC

The Bharat Tablet PC is a low cost tablet being built for distribution in India.

Overview

The Bharat tablet uses Texas Instruments' Sitara ARM-9 SoC, and provides 256 MiB of DDR2 memory (333 MHz), 128 MiB of SLC NAND Flash, and 2 GB in an internal microSD card.

The one examined had no model number, although Year-2011 is printed in a way to suggest that it is might be the model.

Display

The display size is 7" diagonal w. 16:9 aspect ratio. The resolution is 800x460 ?.

There is no internal microphone. There is a single internal speaker.

Connectivity

A 100baseT connection is provided via an RJ-11 jack. No wireless networking is included.

Location/Movement

No location or movement sensing is provided.

Ports

• Two USB type A ports

This is interesting, as the Sitara SoC provides one USB 2.0 OTG port and one USB 1.1 port.

• One RJ-11 for 100baseT
• One microSD card, only accessible internally.
• One full size SD card, externally accessible (no cover)
• One 1/8" stereo phono jack for Headphone
• One 1/8" stereo phono jack for Microphone

Power

The Bharat Tablet has a 14.8Wh Li-Ion polymer battery (4Ah @ 3.7V nominal). It is notable that the battery compartment is easily accessible (one screw), and the battery may be replaced without disassembling the unit. The battery size requires is clearly imprinted in the plastic.

The battery is not a smart battery (only a two wire connection), and there is no battery "gas gauge" on the motherboard.

Breakdown

The tablet opens quite easily (just screws, no adhesives), breaking down into a bottom half containing the single PCB and the battery, and a top half consisting of the sandwich of touchscreen and display.

The screws are all self-tapping, going directly into plastic bosses.

Height

The tablet thickness is roughly ? mm in the middle. The height stackup is:

Height Stackup

Cover Glass: mm
Touchscreen: mm
Air Gap: mm
Display: mm
Swell gap: mm	Main PCB: mm
Battery: mm
Back cover: mm

The touchscreen is a single touch resistive touchscreen. It is implemented as a PET film laminated to the front of an unpolished coverglass, which is then attached with adhesive (but not optically laminated) to the front of the LCD module.

Weight

The tablet weight is roughly ? grams.

BOM

• Overview BOM
• TI Sitara ARM9 SoC
• TLV320AIC3106 Stereo Audio Codec
• SMSC Ethernet Transceiver
• TPS65070 PMIC
• TPS65150 LCD AVDD power supply

Three of the ferrite beads had been soldered down by hand, and there was a handwritten sticker annotating their installation. Hopefully this is a pre-production board..."