# HG changeset patch # User Michael Spacefalcon # Date 1395737492 0 # Node ID 2bec477178fc60db7390caf5a418ab198de75dff # Parent c15cd3d695c0aadfca348a34ce304acf1b7ff211 Pirelli PCB re: Winbond chip connections diff -r c15cd3d695c0 -r 2bec477178fc pirelli/audio --- a/pirelli/audio Sat Mar 22 05:53:02 2014 +0000 +++ b/pirelli/audio Tue Mar 25 08:51:32 2014 +0000 @@ -18,6 +18,34 @@ Finally on L8 they go to the Winbond chip! The speaker connection pins appear to be the two leftmost ones in the top row of 9 pins. +Winbond chip connections + +Chip orientation: as viewed in steve-m's depopulated L8 picture, the pinout +is a L/R flip of the diagram in the datasheet (top and bottom match up, left +and right flipped). + +VREF appears to go to a cap to GND like in the reference schem. +VDD has a fat trace going to a cap; there must be some via(s) to L7 for the +actual power source, but nothing is visible. Coord range to search: +x between 3786 and 3975, y between 1205 and 1387. Might be a bump at +(3880,1380). Probably connects to the "fat finger" trace on L7. + +LED output goes to exposed TP, no visible signs of going anywhere else. +IRQ output goes to exposed TP at (4174,1316), look for it on L7. Couldn't +find it - maybe it isn't connected after all? Will try programming the +chip w/o interrupts. + +RST input: visible microvia at (4078,1357), found it on L7, goes to (4232,1515), +looks like a microvia back to L8. Found it on L8: it's an exposed test point +with the microvia in its centre, and the trace from it goes to SPCA552E ball +J7! From the Nokia schem, it looks like this SPCA pin is an LCM output that +can also be repurposed as a GPIO. + +CS input: visible microvia at (4325,1105) inside an exposed TP. On L7 the long +trace ends at (1760,1385), looks like a possible microvia back to L8. +Found it on L8: it connects to a pin on one of the little ICs under the LCD, +suspected chip select decoder. + Calypso-Iota Voice Band interface Tracing the Calypso voice output signal, starting from Calypso ball P14 (VDX).