MotorolaC123 » History » Revision 23
Revision 22 (laforge, 01/19/2022 08:50 AM) → Revision 23/24 (laforge, 01/15/2023 06:11 PM)
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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":https://gitea.osmocom.org/phone-side/osmocom-bb/src/branch/master/src/target/firmware/fb/fb_st7558.c part of osmocom-bb
"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]]
