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SonyEricssonJ100i » History » Version 17

fixeria, 01/17/2019 01:17 PM

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h1. Sony Ericsson J100i
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{{>toc}}
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The J100i seems to be one of many ODM phones that Sony Ericsson bought from Compal communications in Taiwan.
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h2. Specifications
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* GSM 900 / GSM 1800 dual-band (J100i)
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* GSM 850 / GSM 1900 dual-band (J100a)
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* 100 x 44 x 18 mm, 79g
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* STN 65k - 96 x 64 pixels
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* 900mAh Li-Po battery
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* Ti Calypso/Iota/Rita chipset 
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h2. Hardware
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{{thumbnail(se_j100_pcb_small.2.jpg)}}
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large version: [raw-attachment:se_j110_pcb.jpg]
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h3. Schematics
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They can be found here: http://files.shrak-mobile.com/schem/se/J100_schem.rar
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h3. GSM Chipset
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* DBB: Ti Calypso Baseband, D751749ZHH model (Calypso Lite G2), includes 256kBytes of internal SRAM
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* ABB: Ti TWL3025BZ
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* RF: Ti TRF 6151CJ
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* RF PA: SKY77328-13
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h3. NOR Flash + SRAM
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* Intel RD38F1010C0ZTL0
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** 32MBit NOR (4 MByte)
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** 4Mbit SRAM (512 KByte) 
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h3. Audio ringtone
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* Macronix MX92U832AZCG (unknown datasheet)
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h3. Display
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The display is a 96 x 64 pixels CSTN color display attached to the Calypso DBB via the uWire interface (nReset, nSCS0, SCK, SDO). The backlight is controlled by the DBB IO1.
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Exact model unknown for now.
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h3. Test points
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There are some easily accessible test points (i.e. bigsqare and not very small round pads behind the rf shields).
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Theses test points are divided in two groups (when looking from behind the phone) :
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* A group of 7 TPs at the lower left of the PCB. Accessible from the battery compartment without disassembly except for the first one. From left to right :
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** *TP16*: JTAG TDO
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** *TP9*: CTS MODEM
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** *TP13*: TX MODEM
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** *TP14*: RX MODEM
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** *TP3*: DL PWR
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** *TP107*: GND
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** *TP19*: VBAT
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* A group of 5 TPs at the middle/upper right of the PCB. Theses are not accessible without disassembly, but could be by cutting a small plastic strip just right of the hole made for the battery connector. From left to right:
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** *TP18*: JTAG TMS
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** *TP20*: BAT_TEMP
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** *TP17*: JTAG TCK
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** *TP15*: VCHG
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** *TP8*: JTAG TDI
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h2. Misc notes
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h3. Serial cable
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You can use a standard Sony Ericsson USB cable, since the USB pins match the RX/TX pins of the Calypso UART. You just need to build some USB-A female to serial converter:
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picture source: "Simon Eugster, CC-BY-SA":http://commons.wikimedia.org/wiki/File:USB.svg
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{{thumbnail(usb_a_plug.2.png)}}
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||*pin number*||*USB pin*||*UART pin*||*color*||
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||1||+5V||-nc-||red||
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||2||D-||RxD (Device to PC)||white||
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||3||D+||TxD (PC to Device)||green||
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||4||-||ground||black||
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See the J100i cable how-to which has been sent in by 'timrrr': [raw-attachment:J100i_cable.pdf]
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h3. Bootloader
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* The RAM loader of the J100i is the same as used on the [[MotorolaC140]] series and it works fine with osmocon. It however expects a "1003" magic word to be present at address 0x803ce0.
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* To bypass this limitation, use the Calypso romloader to chainload the application. Here's an example for loading [[layer1bin]]:
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<pre>
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$ ./osmocon -p /dev/ttyUSB0 -m c140 -c ../../target/firmware/board/se_j100/layer1.highram.bin ../../target/firmware/board/se_j100/chainload.compalram.bin
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</pre>
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* If this doesn't work, try c140xor
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