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authorDaniel Silverstone <dsilvers@digital-scurf.org>2019-04-13 18:52:08 +0100
committerDaniel Silverstone <dsilvers@digital-scurf.org>2019-04-13 18:52:08 +0100
commit4cfdca5eab13ce6fae739b9b10b59f0245a6a671 (patch)
treee49e93799b512e84ffaa1960bf1091a61adbfe01 /parts
parent75eec03d3b1918afb98fcdd65181ff4659c26bc9 (diff)
downloadentropykey-4cfdca5eab13ce6fae739b9b10b59f0245a6a671.tar.bz2
Further work on prototype
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@@ -42,6 +42,8 @@ be plenty, let's get the most efficient we can though.
C83932 - 3v3 250mA - £0.0171 in 20s, £0.342 for 20 - MOQ
+
+
### HV DC-DC
C181783 - MT3540-F23 - £0.0511 in fives - £0.511 for 10
@@ -59,6 +61,16 @@ C218837 - 10uH 3x3x1.2 inductor - £0.0888 in 10s - £0.888 for 10
https://datasheet.lcsc.com/szlcsc/Cyntec-PST031B-100MS_C218837.pdf
+### Diode for DC-DC
+
+Switching diode makes sense, min reverse voltage support 30v since we're
+switching to 20v, most switching diodes are 100v reverse capable.
+
+Our chosen diode pack (MMBD4148CA) is two diodes in one package, with the
+third pin the common -ve.
+
+C181116 - SOT-23-3 diode, £0.0064 in 50s - £0.32 for 50
+
Noise Generators
----------------
@@ -114,3 +126,16 @@ C193191 - Blue 0603 - £0.0049 in 50s - £0.245 for 50
Probably fit one of each to each board for convenience.
+### Jumpers
+
+We'll need jumpers in order to fit the boot signals etc
+
+C100114 - Basic jumper (Black) - £0.0041 in 50s - £0.205 for 50
+
+### Buttons
+
+We want to fit a reset button to the board for ease of pushing reset.
+
+C294505 - Basic N/O SPST tactile - £0.0148 in 20s - £0.296 for 20
+
+https://datasheet.lcsc.com/szlcsc/BRIGHT-TSA061G90-250_C294505.pdf