OsmocomBB

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h1. Motorola C123

The C123 seems to be one of many ODM phones that Motorola bought from Compal communications in Taiwan.  It seems (nearly?) identical with the C118.

!c123_2.jpg!

The internal name of the hardware is E88

h2. Specifications

* GSM 900 / GSM 1800 dual-band

* 101x45x21 mm, 86 grams

* no GPRS

* 920mAh Li-Ion battery

* Ti Calypso/Iota/Rita chipset

h2. Hardware

!{width=66%}c123_pcb.jpg!

h3. Schematics

The schematics (part of the Level 3 Service Manual) can be found at various mobile phone related

websites, including http://www.uydudoktoru.com/dosyalar/gsmschema/20061016154029.rar

h3. GSM Chipset

* DBB: Ti Calypso Baseband, D751749ZHH model (Calypso Lite G2), includes 256kBytes of internal SRAM

* ABB: Ti TWL3025BZGR

* RF: TRF6151C

* RF PA: SKY77324-12

h3. NOR Flash

* Intel 28F160C3TD (16Mbits, i.e. 2 MByte) Advanced+ Boot Block Flash Memory (C3)

* Data sheet will be in git

h3. SRAM

* ESMT M24L2161128SA-70BE (128k x16, i.e. 256kByte)

* Data sheet "available from vendor":http://www.esmt.com.tw/DB/manager/upload/M24L216128SA.pdf

h3. Display

The display is a 96x64 pixels monochrome LCD, attached via I2C bus to the Calypso DBB chip.

The LCD controller inside the display is a "Sitronix ST7558":http://www.sitronix.com.tw/sitronix/product.nsf/Doc/ST7558?OpenDocument,

for which the data sheet is available.  There is a community-based 

"driver implemented in PIC16 assembly":https://calypso.gnumonks.org/trac/browser/phone/motorola_compal/C115/example_project (in our git repository)

h3. Test Points

h4. Test points surrounding Iota

* TP4 -- BS_TDO, the JTAG TDO signal of the Iota (connected to TDI of Calypso)

* TP5 -- Iota:TESTV pin

* TP7 -- Uita:CK13M, connected from Calypso:CLK13M_OUT

* TP29 -- Iota:ADIN1 (VADCID)

* TP111 -- Iota:UDR (USP Rx), connects to Calypso:MCUDO

* TP110 -- Iota:UEN (USP Enable), connects to Calypso:MCUEN0

* TP112 -- Iota:ONNOFF

* TP114 -- Intoa:ITWAKEUP, connects to Calypso:RTC_ALARM

* TP113 -- Iota:RESPWONZ, connects to Calypso:RTSPWRONZ

* TP116 -- Iota:TEST3

* TP117 -- Iota:TEST4

h4. Test points surrounding Calypso

* TP11 -- Calypso:DSR_MODEM

* TP12 -- Calypso:RTS_MODEM

* TP23 -- Calypso:nCS4

* TP46 -- Calypso:CLK32K_OUT, connects to Iota:CK32K

* TP118 -- Calypso:EXT_IRQ, connects to Iota:INT2

* TP115 -- Calypso:EXT_FIQ, connects to Iota:INT1

* TP45 -- Calypso:SCLK (I2C)

* TP30 -- Calypso:nSCS1 (I2C)

* TP44 -- Calypso:SDO (I2C)

* TP34 -- Calyspo:nCS2

* TP48 -- Calypso:nCS3/INT4N

* TP49 -- Calypso:VRDBB_1.5V

* J2 -- Calypso NM_DAI_INTERFACE (MCSI_TXD, MCSI_CLK, MCSI_RXD, MCSI_RSYNCH, GND)

!mcsi_pinout.jpg!

h4. Test points accessible from battery compartment

!MotorolaC123:compal_testpads.png!

On the C123 the following pads are usable

* TP27 -- DLPWR (download power on), connects to Iota:RPWON

* TP14 -- RxD Modem

* TP13 -- TxD Modem

* TP9 -- CTS Modem

* TP39 -- GND

On most phones other pads are grounded and not usable (like in the scan above).

Known exceptions

* C115 and C117 have all test pads

* C155 has JTAG but not IRDA UART test pads

h3. Charger Connector

The charger connector is a barrel-type with 3mm diameter and a segmented shaft. The top ring is not connected, the lower ring is GND. The top pin supplies +5V to the phone.

!c123_charger_connector.jpg!

h3. Antenna Connector

The antenna connector is a "MS-147":http://www.hirose-connectors.com/connectors/H205SeriesGaiyou.aspx?c1=MS-147&c3=3.

h3. PCB photographs

Available from "Pictures of each individual PCB layer can be found here: [http://www.steve-m.de/pictures/compal_e88/":http://laforge.gnumonks.org/photoalbum/devices/motorola_compal/c123] or at [[MotorolaC123PCB]]