wiki:MotorolaC123

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.

The internal name of the hardware is E88

Specifications

  • GSM 900 / GSM 1800 dual-band
  • 101x45x21 mm, 86 grams
  • no GPRS
  • 920mAh Li-Ion battery
  • Ti Calypso/Iota/Rita? chipset

Hardware

c123 pcb annotated

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

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

NOR Flash

  • Intel 28F160C3TD (16Mbits, i.e. 2 MByte) Advanced+ Boot Block Flash Memory (C3)
  • Data sheet will be in git

SRAM

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, for which the data sheet is available. There is a community-based driver implemented in PIC16 assembly (in our git repository)

Test Points

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

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)
    • pinout of MCSI port (NM_DAI)

Test points accessible from battery compartment

testpads of the compal calypso phones

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

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

Antenna Connector

The antenna connector is a MS-147.

PCB photographs

Available from http://laforge.gnumonks.org/photoalbum/devices/motorola_compal/c123

Pictures of each individual PCB layer can be found here: http://www.steve-m.de/pictures/compal_e88/ or at MotorolaC123/PCB

Last modified 2 years ago Last modified on Dec 13, 2011, 7:18:40 AM

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