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comparison pirelli/chg-circuit @ 387:f190b78c3b6a

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pirelli/chg-circuit: found PCHG and the precharge circuit
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 23 Mar 2022 21:20:26 +0000
parents 8d19e61d202f
children b99663e66660
comparison
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386:8d19e61d202f 387:f190b78c3b6a
58 trace to another microvia at (3003,1363). On L1 it goes to Iota ball A5 - it 58 trace to another microvia at (3003,1363). On L1 it goes to Iota ball A5 - it
59 is VCHG. 59 is VCHG.
60 60
61 The via hole on L7 at (5631,1250) appears to be an inner via after all: let's 61 The via hole on L7 at (5631,1250) appears to be an inner via after all: let's
62 look for it on other layers. Couldn't find any connections. 62 look for it on other layers. Couldn't find any connections.
63
64 Let's try tracing PCHG (ball B5) from Iota: it goes through a 2-pad component
65 (probably the precharge current limiting resistor) centered at (2862,1443) and
66 then to a microvia at (2849,1378). On the populated pic, the 2-pad component
67 is indeed a black resistor, marked "470". Tracing the microvia from L1 at
68 (2849,1378): it goes to an inner via at (2865,1350). Found it on L4: goes to
69 another inner via at (5548,1198). Looking for the new via: found it on L5, goes
70 to another via at (5593,717). Looking for the new via at (5593,717): found it
71 on L7, microvia to L8 at (5514,741). On L8 the microvia lies in the polygon
72 that connects the drain output of the P-MOSFET to the anode of the Schottky
73 diode, matching TI's reference charging circuit.