Editing N900 Hardware Schematic

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An [[Nokia N900|N900]] schematic appears to be at [http://mohammadag.xceleo.org/public/.private/Nokia_N900_RX-51_Schematics.pdf] and now on [http://www.google.de/search?q=nokia+n900+rx-51+schematics.pdf&oq=Nokia_N900_RX-51_schematics].
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An [[Nokia N900|N900]] schematic appears to be at <ref name="schematics download">http://mohammadag.xceleo.org/public/.private/Nokia_N900_RX-51_Schematics.pdf</ref>
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Service Manuals L1_2 and L3_4 can be found under e.g. http://www.google.de/search?q=Nokia_N900_RX-51_Service_Manual_L1L2_v1_0.pdf
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This might not be the exact version of the schematic used to make the phone.
This might not be the exact version of the schematic used to make the phone.
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Revision is given as 2JH_21A on the schematic. However, the pictured PCB in the schematic is 2JH_20 - see above the third row from the right keys. A dissasembled purchased n900 showed a revision number of 2JH_21<ref name="high resolution scans">http://maemo.cloud-7.de/Gallery-N900-exploded/</ref>.
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Revision is given as 2JH_21A on the schematic. However, the pictured PCB in the schematic is 2JH_20 - see above the third row from the right keys. A dissasembled purchased n900 showed a revision number of 2JH_21<ref name="high resolution scans">http://people.openmoko.org/joerg/n900</ref>.
This is a brief list of what's where on the schematic.
This is a brief list of what's where on the schematic.
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==Page 3  Memory==
==Page 3  Memory==
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* N5210 - uSD hotswap detector (a Hall switch or Reed, operated by magnet in back cover)
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* N5210 - uSD hotswap detector
* D4800 - OMAP3430 - [[N900 CPU]]
* D4800 - OMAP3430 - [[N900 CPU]]
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* D5000 - Combo memory - 64M*32 DDR, 128M*16 Flash. (POP Package On Package on top of OMAP)
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* D5000 - Combo memory - 64M*32 DDR, 128M*16 Flash. (POP?)
* D5200 - eMMC 32 GB
* D5200 - eMMC 32 GB
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* N1130 - Fuel Gauge - [[N900 Hardware Charge Meter]]
* N1130 - Fuel Gauge - [[N900 Hardware Charge Meter]]
* N1140 - Battery Charger - [[N900 Hardware Battery Charger]]
* N1140 - Battery Charger - [[N900 Hardware Battery Charger]]
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* R1129+R1130 - Sense resistor for Fuel Gauge. (actual values in milli Ohms *urgently* needed! Seems to be 20mR)
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* R1129+R1130 - Sense resistor for Fuel Gauge. (actual values in milli Ohms *urgently* needed!)
* R1110 - 10 K thermistor in parallel with 1n to ground, to ADCIN0 on GAIA - labeled "Battery temperature sensor"
* R1110 - 10 K thermistor in parallel with 1n to ground, to ADCIN0 on GAIA - labeled "Battery temperature sensor"
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* N1510 - Touchscreen controller [[N900 Hardware Subsystems#Touchscreen]]
* N1510 - Touchscreen controller [[N900 Hardware Subsystems#Touchscreen]]
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Erratum:
 
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I2C_2(1:0)
 
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CPU > OMAP3430
 
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is I2C_3, not I2C_2
 
==Page 6 LEDs==
==Page 6 LEDs==
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* N6543 - 2.8 V regulator with enable, provides power to:
* N6543 - 2.8 V regulator with enable, provides power to:
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* G6450 - 38.4 MHz VCTCXO - clock for Bluetooth and WLAN modules automatically enabled when either require clock, through D6450 OR gate to above regulator.
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* G6450 - 38.4 MHz VCTCXO - clock for Bluetooth and WLAN modules automatically enabled when either require clock, through or gate to above regulator.
* N6300 - WLAN module
* N6300 - WLAN module
* N6000 - BT module / FM receiver - [[N900 FM radio receiver]]
* N6000 - BT module / FM receiver - [[N900 FM radio receiver]]
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Erratum:
 
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WLAN_BT(3:0)
 
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line_3 N6300 WLAN module : BT_FREQ goes to nirvana
 
==Page 10 GPS==
==Page 10 GPS==
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==Page 11 RAPUYAMA, GAZOO==
==Page 11 RAPUYAMA, GAZOO==
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* N2200 - Gazoo (modem companion chip similar to GAIA)
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* N2200 - Gazoo
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* D2800 - Rapuyama -  Nokia BB5 Modem
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* D2800 - Rapuyama
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* D3000 - 128 Mbit NOR flash + 128 Mbit DDR RAM - connected only to Rapuyama
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* D3000 - 128 M NOR flash + 128 M DDR - connected only to Rapuyama
==Page 12 Display flex connector==
==Page 12 Display flex connector==
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* N1540 - Reflective optical switch (proximity sensor)
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* N1540 - Reflective optical switch
* N1530 - Ambient light sensor
* N1530 - Ambient light sensor
* N1550 - CMOS camera module
* N1550 - CMOS camera module
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* V1540 - RGB indicator LED
 
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Erratum:
 
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I2C_3(1:0)
 
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BTFM > BTFM Module
 
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CPU > OMAP3430
 
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Offsheet symbol incorrect, connection to I2C_3 is via BTB(12:13). Probably, when fixing erratum on page 5, this off sheet symbol is no longer needed to make DRC happy.
 
==Page 13 RF Part==
==Page 13 RF Part==
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Cellphone components RF block
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* N7560 - Aura DC/DC converter for power supply
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* Aura - Vapaus, ... Cellphone components.
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* N7500 - Vapaus RX I/Q sampling, TX encoder, connected to RAPUYAMA. Provides reference clock to GPS
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* N7540 - WCDMA Power amplifier TX
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==Page 14 Signal Overview (Top)==
==Page 14 Signal Overview (Top)==
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==Note on component types and values==
==Note on component types and values==
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The schematics only use symbolic labels for most components, and abstract names made up by Nokia for some of the large chips (e.g. GAYA, RAPUYAMA). However at least most resistors and capacitors have their size printed next to them. So the simpler the component, the harder it gets to tell what it actually is - except for capacitors and resistors. For a lot of chips you can read the actual printing from body of component, by looking at the photos p. 14, 15 and at [http://maemo.cloud-7.de/Gallery-N900-exploded/ Joerg Reisenweber's highres scans] <ref name="high resolution scans"/>.
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The schematics only use symbolic labels for most components, and abstract names made up by Nokia for some of the large chips (e.g. GAYA, RAPUYAMA). However at least most resistors and capacitors have their size printed next to them. So the simpler the component, the harder it gets to tell what it actually is - except for capacitors and resistors. For a lot of chips you can read the actual printing from body of component, by looking at the photos p. 14, 15 and on the highres scans<ref name="high resolution scans"/>.
This webpage<ref name="teardown BOM">http://www2.electronicproducts.com/Nokia_N900_Mobile_Phone-whatsinside_text-90.aspx</ref> has a pretty decent list of components from a reverse engineering teardown effort by isuppli.com. Almost a BOM, if only they had added the symbolic labels or exact component locations to link back to the schematics. Comes even with links to datasheets, physical dimensions of component, etc pp.
This webpage<ref name="teardown BOM">http://www2.electronicproducts.com/Nokia_N900_Mobile_Phone-whatsinside_text-90.aspx</ref> has a pretty decent list of components from a reverse engineering teardown effort by isuppli.com. Almost a BOM, if only they had added the symbolic labels or exact component locations to link back to the schematics. Comes even with links to datasheets, physical dimensions of component, etc pp.

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