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[zvi] changed the schematics. MIC5205 is in together with its capacitor C3.
The MIC5205 has two drawbacks:
  a. No guaranteed behavior for Vin < 5.5 V.  
  b. No guaranteed behavior regarding reverse leakage.
For applications with external supply greater than 5.5V there is no problem.
We will have to test the reverse current issue when operating on USB 5V without external supply.
We will have to test the dropout issue when operating on external supply lower than 5.5V.
Anyhow we will be able to switch back to the MIC5225 without changing the PCB.
This commit is contained in:
yoshco 2014-05-25 16:02:29 +03:00
parent 6f18b16005
commit 02d8a9dfcf
1 changed files with 81 additions and 59 deletions
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140
ATTAMI.sch
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@ -1956,7 +1956,7 @@ http://dangerousprototypes.com</description>
<part name="GND3" library="SparkFun" deviceset="GND" device=""/> <part name="GND3" library="SparkFun" deviceset="GND" device=""/>
<part name="GND5" library="SparkFun" deviceset="GND" device=""/> <part name="GND5" library="SparkFun" deviceset="GND" device=""/>
<part name="D1" library="microbuilder" deviceset="DIODE" device="SOD-323" value="Schottky"/> <part name="D1" library="microbuilder" deviceset="DIODE" device="SOD-323" value="Schottky"/>
<part name="C2" library="SparkFun" deviceset="CAP" device="0805" value="2.2uf"/> <part name="C2" library="SparkFun" deviceset="CAP" device="0805" value="2.2uf/16V"/>
<part name="D2" library="dp_devices" deviceset="LED" device="-0805" value="Blue LED"/> <part name="D2" library="dp_devices" deviceset="LED" device="-0805" value="Blue LED"/>
<part name="D3" library="dp_devices" deviceset="LED" device="-0805" value="Blue LED"/> <part name="D3" library="dp_devices" deviceset="LED" device="-0805" value="Blue LED"/>
<part name="GND16" library="SparkFun" deviceset="GND" device=""/> <part name="GND16" library="SparkFun" deviceset="GND" device=""/>
@ -1968,12 +1968,13 @@ http://dangerousprototypes.com</description>
<part name="J3" library="dp_devices" deviceset="CON_HEADER_1X05" device="-PTH"/> <part name="J3" library="dp_devices" deviceset="CON_HEADER_1X05" device="-PTH"/>
<part name="GND1" library="SparkFun" deviceset="GND" device=""/> <part name="GND1" library="SparkFun" deviceset="GND" device=""/>
<part name="GND6" library="SparkFun" deviceset="GND" device=""/> <part name="GND6" library="SparkFun" deviceset="GND" device=""/>
<part name="C1" library="SparkFun" deviceset="CAP" device="0805" value="1uf"/> <part name="C1" library="SparkFun" deviceset="CAP" device="0805" value="1uf/25V"/>
<part name="D4" library="dp_devices" deviceset="LED" device="-0805" value="Red LED"/> <part name="D4" library="dp_devices" deviceset="LED" device="-0805" value="Red LED"/>
<part name="R4" library="SparkFun" deviceset="RESISTOR" device="0805-RES" value="560R"/> <part name="R4" library="SparkFun" deviceset="RESISTOR" device="0805-RES" value="560R"/>
<part name="GND12" library="SparkFun" deviceset="GND" device=""/> <part name="GND12" library="SparkFun" deviceset="GND" device=""/>
<part name="U1" library="SparkFun" deviceset="V_REG_LDO" device="SMD" value="MIC5225-5.0YM5"/> <part name="U1" library="SparkFun" deviceset="V_REG_LDO" device="SMD" value="MIC5205"/>
<part name="J4" library="pinhead" deviceset="PINHD-1X2" device=""/> <part name="J4" library="pinhead" deviceset="PINHD-1X2" device=""/>
<part name="C3" library="SparkFun" deviceset="CAP" device="0805" value="470pf/16V"/>
</parts> </parts>
<sheets> <sheets>
<sheet> <sheet>
@ -2043,17 +2044,17 @@ Notes for the USER:
<attribute name="NAME" x="146.05" y="100.5586" size="1.778" layer="95"/> <attribute name="NAME" x="146.05" y="100.5586" size="1.778" layer="95"/>
<attribute name="VALUE" x="151.13" y="100.838" size="1.778" layer="96"/> <attribute name="VALUE" x="151.13" y="100.838" size="1.778" layer="96"/>
</instance> </instance>
<instance part="R3" gate="G$1" x="111.76" y="127" smashed="yes" rot="R270"> <instance part="R3" gate="G$1" x="116.84" y="127" smashed="yes" rot="R270">
<attribute name="NAME" x="108.1786" y="125.73" size="1.778" layer="95" rot="R270"/> <attribute name="NAME" x="113.2586" y="125.73" size="1.778" layer="95" rot="R270"/>
<attribute name="VALUE" x="108.458" y="133.35" size="1.778" layer="96" rot="R270"/> <attribute name="VALUE" x="113.538" y="133.35" size="1.778" layer="96" rot="R270"/>
</instance> </instance>
<instance part="GND2" gate="1" x="137.16" y="124.46"/> <instance part="GND2" gate="1" x="137.16" y="124.46"/>
<instance part="GND3" gate="1" x="104.14" y="78.74"/> <instance part="GND3" gate="1" x="104.14" y="78.74"/>
<instance part="GND5" gate="1" x="43.18" y="93.98"/> <instance part="GND5" gate="1" x="43.18" y="93.98"/>
<instance part="D1" gate="G$1" x="99.06" y="127" rot="R90"/> <instance part="D1" gate="G$1" x="104.14" y="127" rot="R90"/>
<instance part="C2" gate="G$1" x="86.36" y="134.62"/> <instance part="C2" gate="G$1" x="91.44" y="134.62"/>
<instance part="D2" gate="LED" x="104.14" y="93.98"/> <instance part="D2" gate="LED" x="104.14" y="93.98"/>
<instance part="D3" gate="LED" x="111.76" y="93.98"/> <instance part="D3" gate="LED" x="116.84" y="93.98"/>
<instance part="GND16" gate="1" x="203.2" y="116.84"/> <instance part="GND16" gate="1" x="203.2" y="116.84"/>
<instance part="GND17" gate="1" x="203.2" y="142.24"/> <instance part="GND17" gate="1" x="203.2" y="142.24"/>
<instance part="SW1" gate="G$1" x="190.5" y="127" smashed="yes"> <instance part="SW1" gate="G$1" x="190.5" y="127" smashed="yes">
@ -2064,18 +2065,28 @@ Notes for the USER:
<instance part="J2" gate="G$1" x="213.36" y="152.4"/> <instance part="J2" gate="G$1" x="213.36" y="152.4"/>
<instance part="J3" gate="G$1" x="213.36" y="132.08"/> <instance part="J3" gate="G$1" x="213.36" y="132.08"/>
<instance part="GND1" gate="1" x="40.64" y="134.62"/> <instance part="GND1" gate="1" x="40.64" y="134.62"/>
<instance part="GND6" gate="1" x="60.96" y="121.92" smashed="yes"> <instance part="GND6" gate="1" x="58.42" y="116.84" smashed="yes">
<attribute name="VALUE" x="58.42" y="119.38" size="1.778" layer="96"/> <attribute name="VALUE" x="55.88" y="114.3" size="1.778" layer="96"/>
</instance> </instance>
<instance part="C1" gate="G$1" x="48.26" y="134.62"/> <instance part="C1" gate="G$1" x="45.72" y="132.08" smashed="yes">
<instance part="D4" gate="LED" x="119.38" y="124.46"/> <attribute name="NAME" x="47.244" y="135.001" size="1.778" layer="95"/>
<instance part="R4" gate="G$1" x="119.38" y="134.62" smashed="yes" rot="R90"> <attribute name="VALUE" x="47.244" y="129.921" size="1.778" layer="96"/>
<attribute name="NAME" x="117.8814" y="128.27" size="1.778" layer="95" rot="R90"/> </instance>
<attribute name="VALUE" x="117.602" y="135.89" size="1.778" layer="96" rot="R90"/> <instance part="D4" gate="LED" x="124.46" y="124.46"/>
<instance part="R4" gate="G$1" x="124.46" y="134.62" smashed="yes" rot="R90">
<attribute name="NAME" x="122.9614" y="128.27" size="1.778" layer="95" rot="R90"/>
<attribute name="VALUE" x="122.682" y="135.89" size="1.778" layer="96" rot="R90"/>
</instance>
<instance part="GND12" gate="1" x="124.46" y="114.3"/>
<instance part="U1" gate="G$1" x="73.66" y="139.7" smashed="yes">
<attribute name="NAME" x="66.04" y="148.844" size="1.778" layer="95"/>
<attribute name="VALUE" x="63.5" y="128.27" size="1.778" layer="96"/>
</instance> </instance>
<instance part="GND12" gate="1" x="119.38" y="114.3"/>
<instance part="U1" gate="G$1" x="73.66" y="139.7"/>
<instance part="J4" gate="G$1" x="30.48" y="142.24" rot="MR0"/> <instance part="J4" gate="G$1" x="30.48" y="142.24" rot="MR0"/>
<instance part="C3" gate="G$1" x="83.82" y="124.46" smashed="yes">
<attribute name="NAME" x="85.344" y="127.381" size="1.778" layer="95"/>
<attribute name="VALUE" x="72.644" y="122.301" size="1.778" layer="96"/>
</instance>
</instances> </instances>
<busses> <busses>
</busses> </busses>
@ -2083,12 +2094,12 @@ Notes for the USER:
<net name="N$10" class="0"> <net name="N$10" class="0">
<segment> <segment>
<pinref part="R1" gate="G$1" pin="1"/> <pinref part="R1" gate="G$1" pin="1"/>
<wire x1="43.18" y1="106.68" x2="111.76" y2="106.68" width="0.1524" layer="91"/> <wire x1="43.18" y1="106.68" x2="116.84" y2="106.68" width="0.1524" layer="91"/>
<wire x1="111.76" y1="106.68" x2="134.62" y2="106.68" width="0.1524" layer="91"/> <wire x1="116.84" y1="106.68" x2="134.62" y2="106.68" width="0.1524" layer="91"/>
<junction x="111.76" y="106.68"/> <junction x="116.84" y="106.68"/>
<wire x1="111.76" y1="106.68" x2="111.76" y2="121.92" width="0.1524" layer="91"/> <wire x1="116.84" y1="106.68" x2="116.84" y2="121.92" width="0.1524" layer="91"/>
<pinref part="R3" gate="G$1" pin="2"/> <pinref part="R3" gate="G$1" pin="2"/>
<wire x1="111.76" y1="96.52" x2="111.76" y2="106.68" width="0.1524" layer="91"/> <wire x1="116.84" y1="96.52" x2="116.84" y2="106.68" width="0.1524" layer="91"/>
<pinref part="D3" gate="LED" pin="A"/> <pinref part="D3" gate="LED" pin="A"/>
<pinref part="J1" gate="G$1" pin="2"/> <pinref part="J1" gate="G$1" pin="2"/>
</segment> </segment>
@ -2103,8 +2114,8 @@ Notes for the USER:
<pinref part="GND3" gate="1" pin="GND"/> <pinref part="GND3" gate="1" pin="GND"/>
<wire x1="104.14" y1="88.9" x2="104.14" y2="83.82" width="0.1524" layer="91"/> <wire x1="104.14" y1="88.9" x2="104.14" y2="83.82" width="0.1524" layer="91"/>
<wire x1="104.14" y1="83.82" x2="104.14" y2="81.28" width="0.1524" layer="91"/> <wire x1="104.14" y1="83.82" x2="104.14" y2="81.28" width="0.1524" layer="91"/>
<wire x1="111.76" y1="88.9" x2="111.76" y2="83.82" width="0.1524" layer="91"/> <wire x1="116.84" y1="88.9" x2="116.84" y2="83.82" width="0.1524" layer="91"/>
<wire x1="111.76" y1="83.82" x2="104.14" y2="83.82" width="0.1524" layer="91"/> <wire x1="116.84" y1="83.82" x2="104.14" y2="83.82" width="0.1524" layer="91"/>
<junction x="104.14" y="83.82"/> <junction x="104.14" y="83.82"/>
<pinref part="D2" gate="LED" pin="C"/> <pinref part="D2" gate="LED" pin="C"/>
<pinref part="D3" gate="LED" pin="C"/> <pinref part="D3" gate="LED" pin="C"/>
@ -2138,20 +2149,24 @@ Notes for the USER:
<segment> <segment>
<pinref part="GND6" gate="1" pin="GND"/> <pinref part="GND6" gate="1" pin="GND"/>
<pinref part="C1" gate="G$1" pin="2"/> <pinref part="C1" gate="G$1" pin="2"/>
<wire x1="48.26" y1="132.08" x2="48.26" y2="124.46" width="0.1524" layer="91"/> <wire x1="45.72" y1="129.54" x2="45.72" y2="119.38" width="0.1524" layer="91"/>
<wire x1="48.26" y1="124.46" x2="60.96" y2="124.46" width="0.1524" layer="91"/> <wire x1="45.72" y1="119.38" x2="58.42" y2="119.38" width="0.1524" layer="91"/>
<wire x1="60.96" y1="139.7" x2="60.96" y2="124.46" width="0.1524" layer="91"/> <junction x="58.42" y="119.38"/>
<junction x="60.96" y="124.46"/>
<pinref part="U1" gate="G$1" pin="GND"/>
<wire x1="60.96" y1="139.7" x2="63.5" y2="139.7" width="0.1524" layer="91"/>
<pinref part="C2" gate="G$1" pin="2"/> <pinref part="C2" gate="G$1" pin="2"/>
<wire x1="86.36" y1="132.08" x2="86.36" y2="124.46" width="0.1524" layer="91"/> <wire x1="91.44" y1="132.08" x2="91.44" y2="119.38" width="0.1524" layer="91"/>
<wire x1="60.96" y1="124.46" x2="86.36" y2="124.46" width="0.1524" layer="91"/> <wire x1="58.42" y1="119.38" x2="83.82" y2="119.38" width="0.1524" layer="91"/>
<pinref part="C3" gate="G$1" pin="2"/>
<wire x1="83.82" y1="119.38" x2="91.44" y2="119.38" width="0.1524" layer="91"/>
<wire x1="83.82" y1="121.92" x2="83.82" y2="119.38" width="0.1524" layer="91"/>
<junction x="83.82" y="119.38"/>
<wire x1="58.42" y1="119.38" x2="58.42" y2="139.7" width="0.1524" layer="91"/>
<pinref part="U1" gate="G$1" pin="GND"/>
<wire x1="58.42" y1="139.7" x2="63.5" y2="139.7" width="0.1524" layer="91"/>
</segment> </segment>
<segment> <segment>
<pinref part="D4" gate="LED" pin="C"/> <pinref part="D4" gate="LED" pin="C"/>
<pinref part="GND12" gate="1" pin="GND"/> <pinref part="GND12" gate="1" pin="GND"/>
<wire x1="119.38" y1="119.38" x2="119.38" y2="116.84" width="0.1524" layer="91"/> <wire x1="124.46" y1="119.38" x2="124.46" y2="116.84" width="0.1524" layer="91"/>
</segment> </segment>
</net> </net>
<net name="N$1" class="0"> <net name="N$1" class="0">
@ -2216,16 +2231,16 @@ Notes for the USER:
<wire x1="200.66" y1="129.54" x2="213.36" y2="129.54" width="0.1524" layer="91"/> <wire x1="200.66" y1="129.54" x2="213.36" y2="129.54" width="0.1524" layer="91"/>
</segment> </segment>
<segment> <segment>
<wire x1="33.02" y1="144.78" x2="48.26" y2="144.78" width="0.1524" layer="91"/> <wire x1="33.02" y1="144.78" x2="45.72" y2="144.78" width="0.1524" layer="91"/>
<label x="27.94" y="144.78" size="1.778" layer="95" rot="R180"/> <label x="27.94" y="144.78" size="1.778" layer="95" rot="R180"/>
<pinref part="C1" gate="G$1" pin="1"/> <pinref part="C1" gate="G$1" pin="1"/>
<wire x1="48.26" y1="139.7" x2="48.26" y2="144.78" width="0.1524" layer="91"/> <wire x1="45.72" y1="137.16" x2="45.72" y2="144.78" width="0.1524" layer="91"/>
<junction x="48.26" y="144.78"/> <junction x="45.72" y="144.78"/>
<wire x1="48.26" y1="144.78" x2="55.88" y2="144.78" width="0.1524" layer="91"/> <wire x1="45.72" y1="144.78" x2="60.96" y2="144.78" width="0.1524" layer="91"/>
<wire x1="55.88" y1="144.78" x2="63.5" y2="144.78" width="0.1524" layer="91"/> <wire x1="60.96" y1="144.78" x2="63.5" y2="144.78" width="0.1524" layer="91"/>
<junction x="55.88" y="144.78"/> <junction x="60.96" y="144.78"/>
<wire x1="63.5" y1="134.62" x2="55.88" y2="134.62" width="0.1524" layer="91"/> <wire x1="63.5" y1="134.62" x2="60.96" y2="134.62" width="0.1524" layer="91"/>
<wire x1="55.88" y1="134.62" x2="55.88" y2="144.78" width="0.1524" layer="91"/> <wire x1="60.96" y1="134.62" x2="60.96" y2="144.78" width="0.1524" layer="91"/>
<pinref part="U1" gate="G$1" pin="IN"/> <pinref part="U1" gate="G$1" pin="IN"/>
<pinref part="U1" gate="G$1" pin="EN"/> <pinref part="U1" gate="G$1" pin="EN"/>
<pinref part="J4" gate="G$1" pin="1"/> <pinref part="J4" gate="G$1" pin="1"/>
@ -2245,26 +2260,25 @@ Notes for the USER:
<net name="VCC" class="0"> <net name="VCC" class="0">
<segment> <segment>
<pinref part="R3" gate="G$1" pin="1"/> <pinref part="R3" gate="G$1" pin="1"/>
<wire x1="99.06" y1="144.78" x2="111.76" y2="144.78" width="0.1524" layer="91"/> <wire x1="116.84" y1="132.08" x2="116.84" y2="144.78" width="0.1524" layer="91"/>
<wire x1="111.76" y1="132.08" x2="111.76" y2="144.78" width="0.1524" layer="91"/> <junction x="116.84" y="144.78"/>
<junction x="111.76" y="144.78"/>
<label x="134.62" y="147.32" size="1.778" layer="95" rot="R180"/> <label x="134.62" y="147.32" size="1.778" layer="95" rot="R180"/>
<pinref part="D1" gate="G$1" pin="C"/> <pinref part="D1" gate="G$1" pin="C"/>
<wire x1="99.06" y1="144.78" x2="99.06" y2="129.54" width="0.1524" layer="91"/> <wire x1="104.14" y1="144.78" x2="104.14" y2="129.54" width="0.1524" layer="91"/>
<pinref part="U2" gate="G$1" pin="VCC"/> <pinref part="U2" gate="G$1" pin="VCC"/>
<pinref part="C2" gate="G$1" pin="1"/> <pinref part="C2" gate="G$1" pin="1"/>
<wire x1="119.38" y1="144.78" x2="142.24" y2="144.78" width="0.1524" layer="91"/> <wire x1="124.46" y1="144.78" x2="142.24" y2="144.78" width="0.1524" layer="91"/>
<wire x1="86.36" y1="139.7" x2="86.36" y2="144.78" width="0.1524" layer="91"/> <wire x1="91.44" y1="139.7" x2="91.44" y2="144.78" width="0.1524" layer="91"/>
<junction x="86.36" y="144.78"/> <junction x="91.44" y="144.78"/>
<junction x="99.06" y="144.78"/> <junction x="104.14" y="144.78"/>
<wire x1="86.36" y1="144.78" x2="119.38" y2="144.78" width="0.1524" layer="91"/>
<pinref part="R4" gate="G$1" pin="2"/> <pinref part="R4" gate="G$1" pin="2"/>
<wire x1="119.38" y1="144.78" x2="111.76" y2="144.78" width="0.1524" layer="91"/> <wire x1="104.14" y1="144.78" x2="116.84" y2="144.78" width="0.1524" layer="91"/>
<wire x1="119.38" y1="139.7" x2="119.38" y2="144.78" width="0.1524" layer="91"/> <wire x1="124.46" y1="144.78" x2="116.84" y2="144.78" width="0.1524" layer="91"/>
<junction x="119.38" y="144.78"/> <wire x1="124.46" y1="139.7" x2="124.46" y2="144.78" width="0.1524" layer="91"/>
<junction x="124.46" y="144.78"/>
<pinref part="U1" gate="G$1" pin="OUT"/> <pinref part="U1" gate="G$1" pin="OUT"/>
<wire x1="99.06" y1="144.78" x2="86.36" y2="144.78" width="0.1524" layer="91"/> <wire x1="104.14" y1="144.78" x2="91.44" y2="144.78" width="0.1524" layer="91"/>
<wire x1="86.36" y1="144.78" x2="81.28" y2="144.78" width="0.1524" layer="91"/> <wire x1="91.44" y1="144.78" x2="81.28" y2="144.78" width="0.1524" layer="91"/>
</segment> </segment>
<segment> <segment>
<label x="203.2" y="149.86" size="1.778" layer="95"/> <label x="203.2" y="149.86" size="1.778" layer="95"/>
@ -2275,10 +2289,10 @@ Notes for the USER:
<net name="V_USB" class="0"> <net name="V_USB" class="0">
<segment> <segment>
<pinref part="D1" gate="G$1" pin="A"/> <pinref part="D1" gate="G$1" pin="A"/>
<wire x1="99.06" y1="109.22" x2="99.06" y2="124.46" width="0.1524" layer="91"/> <wire x1="104.14" y1="109.22" x2="104.14" y2="124.46" width="0.1524" layer="91"/>
<label x="58.42" y="109.22" size="1.778" layer="95"/> <label x="58.42" y="109.22" size="1.778" layer="95"/>
<pinref part="J1" gate="G$1" pin="1"/> <pinref part="J1" gate="G$1" pin="1"/>
<wire x1="99.06" y1="109.22" x2="43.18" y2="109.22" width="0.1524" layer="91"/> <wire x1="104.14" y1="109.22" x2="43.18" y2="109.22" width="0.1524" layer="91"/>
</segment> </segment>
</net> </net>
<net name="N$15" class="0"> <net name="N$15" class="0">
@ -2294,7 +2308,7 @@ Notes for the USER:
<segment> <segment>
<pinref part="R4" gate="G$1" pin="1"/> <pinref part="R4" gate="G$1" pin="1"/>
<pinref part="D4" gate="LED" pin="A"/> <pinref part="D4" gate="LED" pin="A"/>
<wire x1="119.38" y1="129.54" x2="119.38" y2="127" width="0.1524" layer="91"/> <wire x1="124.46" y1="129.54" x2="124.46" y2="127" width="0.1524" layer="91"/>
</segment> </segment>
</net> </net>
<net name="N$4" class="0"> <net name="N$4" class="0">
@ -2304,6 +2318,14 @@ Notes for the USER:
<wire x1="40.64" y1="142.24" x2="40.64" y2="134.62" width="0.1524" layer="91"/> <wire x1="40.64" y1="142.24" x2="40.64" y2="134.62" width="0.1524" layer="91"/>
</segment> </segment>
</net> </net>
<net name="N$9" class="0">
<segment>
<pinref part="U1" gate="G$1" pin="BP"/>
<wire x1="81.28" y1="134.62" x2="83.82" y2="134.62" width="0.1524" layer="91"/>
<pinref part="C3" gate="G$1" pin="1"/>
<wire x1="83.82" y1="134.62" x2="83.82" y2="129.54" width="0.1524" layer="91"/>
</segment>
</net>
</nets> </nets>
</sheet> </sheet>
</sheets> </sheets>