From: Bdale Garbee <bdale@gag.com>
Date: Fri, 27 Mar 2009 07:54:27 +0000 (-0600)
Subject: fix for igniter continuity sense, requires adding a resistor from each sense
X-Git-Tag: fab-v0.2~32^2~50
X-Git-Url: https://git.gag.com/?p=hw%2Ftelemetrum;a=commitdiff_plain;h=6a04d678ab90aed7675f820128dbcefa0f74ffde

fix for igniter continuity sense, requires adding a resistor from each sense
line to ground to establish a voltage divider so that we don't overdrive the
ADC inputs.  values chosen to allow up to 15V pyro battery.
---

diff --git a/telemetrum.sch b/telemetrum.sch
index dca7f66..7937d45 100644
--- a/telemetrum.sch
+++ b/telemetrum.sch
@@ -755,35 +755,22 @@ device=RESISTOR
 T 49000 51500 5 10 1 1 0 0 1
 refdes=R14
 T 49700 51500 5 10 1 1 0 0 1
-value=5k
+value=100k
 T 49000 51700 5 10 0 0 0 0 1
 footprint=0402
 T 49000 51700 5 10 0 1 0 0 1
-digikey=311-5.10KLRCT-ND
-}
-C 49000 49900 1 0 0 resistor.sym
-{
-T 49300 50300 5 10 0 0 0 0 1
-device=RESISTOR
-T 49000 49700 5 10 1 1 0 0 1
-refdes=R15
-T 49700 49700 5 10 1 1 0 0 1
-value=5k
-T 49000 49900 5 10 0 0 0 0 1
-footprint=0402
-T 49000 49900 5 10 0 1 0 0 1
-digikey=311-5.10KLRCT-ND
+digikey=311-100KLRCT-ND
 }
 N 49000 51800 49000 52300 4
 N 49000 50000 49000 50500 4
-N 49900 51800 51200 51800 4
+N 49900 51800 52000 51800 4
 {
-T 50500 51900 5 10 1 1 0 0 1
+T 51300 51900 5 10 1 1 0 0 1
 netname=sense_d
 }
-N 49900 50000 51200 50000 4
+N 49900 50000 52000 50000 4
 {
-T 50500 50100 5 10 1 1 0 0 1
+T 51300 50100 5 10 1 1 0 0 1
 netname=sense_m
 }
 T 13300 -8600 8 10 0 1 0 0 1
@@ -1622,3 +1609,44 @@ N 55600 44900 53600 44900 4
 T 53600 45000 5 10 1 1 0 0 1
 netname=tx1
 }
+C 49000 49900 1 0 0 resistor.sym
+{
+T 49300 50300 5 10 0 0 0 0 1
+device=RESISTOR
+T 49000 49700 5 10 1 1 0 0 1
+refdes=R15
+T 49700 49700 5 10 1 1 0 0 1
+value=100k
+T 49000 49900 5 10 0 0 0 0 1
+footprint=0402
+T 49000 49900 5 10 0 1 0 0 1
+digikey=311-100KLRCT-ND
+}
+C 51100 50900 1 90 0 resistor.sym
+{
+T 50700 51200 5 10 0 0 90 0 1
+device=RESISTOR
+T 51600 51600 5 10 1 1 180 0 1
+refdes=R21
+T 51100 50895 5 10 0 1 90 0 1
+footprint=0402
+T 51100 50900 5 10 0 0 90 0 1
+digikey=311-27KJRCT-ND
+T 51300 51100 5 10 1 1 0 0 1
+value=27k
+}
+C 50900 50600 1 0 0 gnd-1.sym
+C 50900 48800 1 0 0 gnd-1.sym
+C 51100 49100 1 90 0 resistor.sym
+{
+T 50700 49400 5 10 0 0 90 0 1
+device=RESISTOR
+T 51600 49800 5 10 1 1 180 0 1
+refdes=R22
+T 51100 49095 5 10 0 1 90 0 1
+footprint=0402
+T 51100 49100 5 10 0 0 90 0 1
+digikey=311-27KJRCT-ND
+T 51300 49300 5 10 1 1 0 0 1
+value=27k
+}