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comparison pirelli/audio @ 72:2bec477178fc

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Pirelli PCB re: Winbond chip connections
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Tue, 25 Mar 2014 08:51:32 +0000
parents fdfb57a1c5fe
children
comparison
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71:c15cd3d695c0 72:2bec477178fc
15 but they appear to go to vias at (1935,218) and (1934,260). Found them on L3: 15 but they appear to go to vias at (1935,218) and (1934,260). Found them on L3:
16 going to new vias at (3703,311) and (3739,313). (It might actually be L4.) 16 going to new vias at (3703,311) and (3739,313). (It might actually be L4.)
17 Found them on L7: fat traces to micro-vias at (3870,934) and (3898,869). 17 Found them on L7: fat traces to micro-vias at (3870,934) and (3898,869).
18 Finally on L8 they go to the Winbond chip! The speaker connection pins appear 18 Finally on L8 they go to the Winbond chip! The speaker connection pins appear
19 to be the two leftmost ones in the top row of 9 pins. 19 to be the two leftmost ones in the top row of 9 pins.
20
21 Winbond chip connections
22
23 Chip orientation: as viewed in steve-m's depopulated L8 picture, the pinout
24 is a L/R flip of the diagram in the datasheet (top and bottom match up, left
25 and right flipped).
26
27 VREF appears to go to a cap to GND like in the reference schem.
28 VDD has a fat trace going to a cap; there must be some via(s) to L7 for the
29 actual power source, but nothing is visible. Coord range to search:
30 x between 3786 and 3975, y between 1205 and 1387. Might be a bump at
31 (3880,1380). Probably connects to the "fat finger" trace on L7.
32
33 LED output goes to exposed TP, no visible signs of going anywhere else.
34 IRQ output goes to exposed TP at (4174,1316), look for it on L7. Couldn't
35 find it - maybe it isn't connected after all? Will try programming the
36 chip w/o interrupts.
37
38 RST input: visible microvia at (4078,1357), found it on L7, goes to (4232,1515),
39 looks like a microvia back to L8. Found it on L8: it's an exposed test point
40 with the microvia in its centre, and the trace from it goes to SPCA552E ball
41 J7! From the Nokia schem, it looks like this SPCA pin is an LCM output that
42 can also be repurposed as a GPIO.
43
44 CS input: visible microvia at (4325,1105) inside an exposed TP. On L7 the long
45 trace ends at (1760,1385), looks like a possible microvia back to L8.
46 Found it on L8: it connects to a pin on one of the little ICs under the LCD,
47 suspected chip select decoder.
20 48
21 Calypso-Iota Voice Band interface 49 Calypso-Iota Voice Band interface
22 50
23 Tracing the Calypso voice output signal, starting from Calypso ball P14 (VDX). 51 Tracing the Calypso voice output signal, starting from Calypso ball P14 (VDX).
24 On L1 it goes to a via at (3401,429). On L2 it branches: one end goes to 52 On L1 it goes to a via at (3401,429). On L2 it branches: one end goes to