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pirelli/{rssi,txcal}: results of the Pirelli to CMU200 experiment
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 16 Feb 2019 18:30:11 +0000 |
parents | c20dedad87a0 |
children |
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Attempting to learn some of the LCD connector pinout by tracing some signals from the SPCA552E - those signals which are suggested by the Nokia schematic showing the same chip. LCD_D0, coming from SPCA ball D1: L8 trace goes to (3779,1826). L7 trace to (2404,1833). Appears to connect to display pin 9 by way of a via in the pad. LCD_D1, SPCA ball E1: (3802,1816). L7 trace to (2320,1817). Connects to display pin 10. LCD_D2, SPCA ball E2: (3808,1841). L7 trace to (2325,1760). Connects to display pin 11. LCD_D3, SPCA ball E3: (3906,1855). L7 trace passes through (3695,1701), then goes to (2325,1703). The middle tap seems to go to a resistor whose other end is a copper fill (GND). Nokia's schematic has a pull-down resistor on this LCD_D3 net as a mode-select for the SPCA552E. The display end connects to pin 12. LCD_D4, SPCA ball F1: (3791,1774). L7 trace to (2387,1707). Appears to connect to display pin 13 by way of a via in the pad. LCD_D5, SPCA ball F2: (3759,1687). L7 trace to (2483,1551). Connects to display pin 14. LCD_D6, SPCA ball F3: (3744,1664). L7 trace to (2329,1636). Connects to display pin 15. LCD_D7, SPCA ball G1: (3798,1695). L7 trace to (2302,1540). Connects to display pin 16. LCD_D8, SPCA ball G2: (3806,1669). LCD_D9, SPCA ball H1: ball at (3839,1680), no visible connection. LCD_D10, SPCA ball J1: ball at (3840,1631), no visible connection. LCD_D11, SPCA ball H2: ball at (3889,1682), no visible connection. LCD_D12, SPCA ball J2: ball at (3888,1631), no visible connection. The 4 "unconnected" balls above indeed have invisible microvias in the pads, visible on L7. On L7 there is a bundle of 5 traces with LCD_D8 at the bottom and LCD_D12 at the top. Vias back to L8: LCD_D8: (2571,1409), pin 18 LCD_D9: (2544,1408), pin 19 LCD_D10: (2516,1409), pin 20 LCD_D11: (2515,1380), pin 21 LCD_D12: (2569,1298), pin 22 LCD_D13, SPCA ball G3: (3790,1506). L7 trace to (2561,1209), pin 23. LCD_D14, SPCA ball H3: (3827,1507). L7 trace to (2541,1189), pin 24. LCD_D15, SPCA ball J3: (3935,1597). L7 trace to (2522,1165), pin 25. Display connector pinout: Pin 1: Pin 2: Pin 3: Pin 4: Pin 5: Pin 6: Pin 7: Pin 8: Pin 9: D0 Pin 10: D1 Pin 11: D2 Pin 12: D3 Pin 13: D4 Pin 14: D5 Pin 15: D6 Pin 16: D7 Pin 17: connects to copper flood, must be GND Pin 18: D8 Pin 19: D9 Pin 20: D10 Pin 21: D11 Pin 22: D12 Pin 23: D13 Pin 24: D14 Pin 25: D15 Pin 26: fat trace to (2427,1123) Pin 27: looks like a possible via-in-pad Pin 28: fat trace goes through an exposed test point at (3068,1042), then to via at (3161,1001) Pin 29: looks like a possible via-in-pad Pin 30: connects to copper flood, must be GND