Replace the regulator with a 3.0V LD2980. Reduce igniter shut-off gap

Switching to a 3.0V regulator and reducing the igniter shut-off gap
both serve to let the board run on significantly lower battery
voltage, down from 3.9V to 3.4V.

The LD2980 doesn't have a bypass pin, so the 470pF cap was
removed.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/easymini.pcb b/easymini.pcb
index 8f4cbdf3230321196e556af3b0a52407527119ad..ee07a122e7c7515f5570267f9fd94fe276098f07 100644 (file)
--- a/easymini.pcb
+++ b/easymini.pcb
@@ -1153,7 +1153,7 @@ Element["" "0402" "R12" "100k" 425.00mil 5.0104mm 25.00mil -0.7940mm 0 100 ""]
 
        )
 
-Element["" "powerdi123" "D1" "DFLS130L" 182.99mil 490.00mil -90.99mil 30.00mil 2 100 ""]
+Element["" "powerdi123" "D1" "DFLS130L" 182.99mil 490.00mil -142.99mil -32.00mil 0 100 ""]
 (
        Pad[21.65mil 0.0000 53.15mil 0.0000 55.12mil 23.62mil 66.93mil "cathode" "2" "square,edge2"]
        Pad[-62.99mil -9.84mil -62.99mil 9.84mil 35.43mil 23.62mil 47.24mil "anode" "1" "square"]
@@ -1167,7 +1167,7 @@ Element["" "powerdi123" "D1" "DFLS130L" 182.99mil 490.00mil -90.99mil 30.00mil 2
 
        )
 
-Element["" "1210" "C8" "47uF" 167.00mil 359.95mil 71.00mil 100.95mil 1 100 ""]
+Element["" "1210" "C8" "47uF" 167.00mil 359.95mil -119.90mil -88.95mil 0 100 ""]
 (
        Pad[-27.55mil -59.05mil 27.55mil -59.05mil 51.18mil 20.00mil 57.18mil "1" "1" "square"]
        Pad[-27.55mil 59.05mil 27.55mil 59.05mil 51.18mil 20.00mil 57.18mil "2" "2" "square"]
@@ -1264,13 +1264,6 @@ Element["" "ABM8" "X1" "12MHz" 18.2556mm 145.59mil -2.3956mm -3.0192mm 0 100 ""]
 
        )
 
-Element["" "0402" "C5" "470pF" 9.7094mm 754.00mil 3.2700mm -20.00mil 0 100 ""]
-(
-       Pad[15.74mil -3.93mil 15.74mil 3.93mil 19.68mil 20.00mil 25.68mil "1" "1" "square"]
-       Pad[-15.74mil -3.93mil -15.74mil 3.93mil 19.68mil 20.00mil 25.68mil "2" "2" "square"]
-
-       )
-
 Element["" "0402" "R14" "10k" 278.00mil 738.26mil 22.00mil -3.0800mm 3 100 ""]
 (
        Pad[-3.93mil 15.74mil 3.93mil 15.74mil 19.68mil 20.00mil 25.68mil "1" "1" "square"]
@@ -1278,14 +1271,14 @@ Element["" "0402" "R14" "10k" 278.00mil 738.26mil 22.00mil -3.0800mm 3 100 ""]
 
        )
 
-Element["" "0402" "R15" "6.81k" 8.1468mm 754.00mil 2.3434mm -20.00mil 0 100 ""]
+Element["" "0402" "R15" "7.5k" 8.1468mm 754.00mil 0.9718mm -19.00mil 0 100 ""]
 (
        Pad[15.74mil -3.93mil 15.74mil 3.93mil 19.68mil 20.00mil 25.68mil "1" "1" "square"]
        Pad[-15.74mil -3.93mil -15.74mil 3.93mil 19.68mil 20.00mil 25.68mil "2" "2" "square"]
 
        )
 
-Element["" "SOT23-5" "U2" "MIC5205" 407.00mil 715.00mil -120.00mil -153.00mil 0 89 ""]
+Element["" "SOT23-5" "U2" "LD2980" 407.00mil 715.00mil -120.00mil -153.00mil 0 89 ""]
 (
        Attribute("author" "DJ Delorie")
        Attribute("copyright" "2006 DJ Delorie")
@@ -1556,16 +1549,12 @@ Layer(1 "top")
        Line[278.00mil 18.3520mm 278.00mil 658.00mil 10.00mil 12.00mil "clearline"]
        Line[278.00mil 658.00mil 299.00mil 637.00mil 10.00mil 12.00mil "clearline"]
        Line[299.00mil 637.00mil 325.00mil 637.00mil 10.00mil 12.00mil "clearline"]
-       Line[336.48mil 754.00mil 366.52mil 754.00mil 10.00mil 12.00mil "clearline"]
-       Line[407.00mil 715.00mil 407.00mil 745.00mil 10.00mil 12.00mil "clearline"]
-       Line[407.00mil 745.00mil 398.00mil 754.00mil 10.00mil 12.00mil "clearline"]
        Line[397.00mil 598.00mil 397.00mil 627.00mil 10.00mil 12.00mil "clearline"]
        Line[397.00mil 627.00mil 407.00mil 637.00mil 10.00mil 12.00mil "clearline"]
        Line[305.00mil 754.00mil 249.00mil 754.00mil 10.00mil 12.00mil "clearline"]
        Line[325.00mil 676.00mil 361.00mil 676.00mil 25.00mil 20.00mil "clearline"]
        Line[365.52mil 591.00mil 365.52mil 671.48mil 10.00mil 12.00mil "clearline"]
        Line[365.52mil 671.48mil 361.00mil 676.00mil 10.00mil 12.00mil "clearline"]
-       Line[367.00mil 754.00mil 367.00mil 682.00mil 10.00mil 12.00mil "clearline"]
        Line[367.00mil 682.00mil 361.00mil 676.00mil 10.00mil 12.00mil "clearline"]
        Line[325.00mil 637.00mil 305.00mil 637.00mil 25.00mil 20.00mil "clearline"]
        Line[22.8655mm 148.99mil 964.01mil 148.99mil 10.00mil 12.00mil "clearline"]
@@ -1662,6 +1651,9 @@ Layer(1 "top")
        Line[787.00mil 532.00mil 717.00mil 462.00mil 10.00mil 12.00mil "clearline"]
        Line[886.00mil 559.00mil 825.00mil 559.00mil 10.00mil 12.00mil "clearline"]
        Line[825.00mil 559.00mil 789.00mil 595.00mil 10.00mil 12.00mil "clearline"]
+       Line[366.00mil 676.00mil 366.00mil 737.00mil 10.00mil 12.00mil "clearline"]
+       Line[366.00mil 737.00mil 349.00mil 754.00mil 10.00mil 12.00mil "clearline"]
+       Line[349.00mil 754.00mil 8.5466mm 754.00mil 10.00mil 12.00mil "clearline"]
 )
 Layer(2 "bottom")
 (

diff --git a/easymini.sch b/easymini.sch
index 829ff5a46a18a7fa4e7d4a6eef85b97bf3d1ff58..9aa9b8a30423d27569d257cfec846b14c8dd760e 100644 (file)
--- a/easymini.sch
+++ b/easymini.sch
@@ -567,25 +567,6 @@ refdes=C8
 T 13800 11700 5 10 1 1 180 0 1
 value=47uF
 }
-C 16000 12200 1 270 0 capacitor.sym
-{
-T 16700 12000 5 10 0 0 270 0 1
-device=CAPACITOR
-T 16000 12200 5 10 0 0 270 0 1
-vendor_part_number=311-1028-1-ND
-T 16000 12200 5 10 0 0 270 0 1
-footprint=0402
-T 16000 12200 5 10 0 0 270 0 1
-vendor=digikey
-T 16300 11900 5 10 1 1 0 0 1
-refdes=C5
-T 16300 11400 5 10 1 1 0 0 1
-value=470pF
-T 16000 12200 5 10 0 1 0 0 1
-loadstatus=smt
-T 16000 12200 5 10 0 1 0 0 1
-symversion=0.1
-}
 C 13800 11700 1 0 0 TC2185.sym
 {
 T 14395 12395 5 10 0 1 0 0 1
@@ -595,16 +576,15 @@ footprint=SOT23-5
 T 13800 11700 5 10 0 0 0 0 1
 vendor=digikey
 T 13800 11700 5 10 0 0 0 0 1
-vendor_part_number=576-1259-1-ND
+vendor_part_number=497-1516-1-ND
 T 13800 11700 5 10 0 0 0 0 1
 loadstatus=smt
 T 14095 12895 5 10 1 1 0 0 1
 refdes=U2
 T 14900 12900 5 10 1 1 0 0 1
-value=MIC5205
+value=LD2980
 }
 C 14800 10950 1 0 0 gnd.sym
-N 15900 12200 16200 12200 4
 T 26850 11900 9 40 1 0 0 0 1
 EasyMini
 N 21500 22500 20500 22500 4
@@ -1110,7 +1090,7 @@ T 24500 23100 5 10 1 1 180 0 1
 refdes=R17
 T 24100 22600 5 10 1 1 0 0 1
 value=8.45k
-T 24800 22400 5 10 1 1 0 0 1
+T 24800 22400 5 10 0 1 0 0 1
 vendor_part_number=P8.45KLCT-ND
 }
 C 24800 23300 1 90 0 resistor.sym
@@ -1127,7 +1107,7 @@ T 24500 24000 5 10 1 1 180 0 1
 refdes=R16
 T 24200 23500 5 10 1 1 0 0 1
 value=10k
-T 24800 23300 5 10 1 1 0 0 1
+T 24800 23300 5 10 0 1 0 0 1
 vendor_part_number=P10.0KLCT-ND
 }
 C 24000 23900 1 90 0 resistor.sym
@@ -1143,9 +1123,9 @@ loadstatus=smt
 T 23700 24600 5 10 1 1 180 0 1
 refdes=R15
 T 23300 24100 5 10 1 1 0 0 1
-value=6.81k
-T 24000 23900 5 10 1 1 0 0 1
-vendor_part_number=P6.81KLCT-ND
+value=7.5k
+T 24000 23900 5 10 0 1 0 0 1
+vendor_part_number=P7.50KLCT-ND
 }
 C 24000 24800 1 90 0 resistor.sym
 {
@@ -1161,8 +1141,6 @@ T 23700 25500 5 10 1 1 180 0 1
 refdes=R14
 T 23400 25000 5 10 1 1 0 0 1
 value=10k
-T 24000 24800 5 10 1 1 0 0 1
-vendor_part_number=P10.0KLCT-ND
 }
 C 24500 24200 1 0 0 3.3V-plus.sym
 C 24600 22100 1 0 0 gnd.sym
@@ -1223,3 +1201,10 @@ N 14500 15100 14500 15500 4
 N 14500 15500 17500 15500 4
 N 17500 15500 17500 15100 4
 C 17400 14100 1 0 0 gnd.sym
+C 15900 12100 1 0 0 nc-right.sym
+{
+T 16000 12600 5 10 0 0 0 0 1
+value=NoConnection
+T 16000 12800 5 10 0 0 0 0 1
+device=DRC_Directive
+}