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Rev 6.4
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@mcbridejc
mcbridejc committed Dec 6, 2021
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15 changes: 15 additions & 0 deletions ChangeLog.md
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@@ -1,3 +1,11 @@
# Rev 6.4 (Dec 2021)

Bug fixes to 6.3:

- Fix ISENSE bug in 6.3, by adding diode to clamp negative outputs. Adds D68,
R71, and C63.
- Correct digikey part number for J9 (barrel jack)

# Rev 6.3 (Nov 2021)

Bug fixes for rev 6.2:
Expand All @@ -7,6 +15,13 @@ Bug fixes for rev 6.2:
- Change C59 from 0.01uF to 0.1uF (VHV_TARGET_PWM filter)
- Change R29 from 511ohm to 0 (Current integrator output filter)

Errata:

- Large currents cause negative voltage on SAMG input pin, which can reset
the device when too much liquid is on the board. This board should only be
use with ISENSE trace cut (optionally, can add resistor and diode to re-enable
use of ISENSE line).

# Rev 6.2 (Aug 2021)

Updated for current parts availability.
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8 changes: 4 additions & 4 deletions README.md
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Expand Up @@ -10,19 +10,19 @@ development, and there may be some recent updates or issues not yet reflected he
that you should consider. This repository is maintained by Jeff McBride, who can be
reached at [email protected].

The latest release of PurpleDrop is v6.3. See [](ChangeLog.md]) for history.
The latest release of PurpleDrop is v6.4. See [](ChangeLog.md]) for history.

# PurpleDrop System Documentation

For more information, including instructions on building and using a PurpleDrop, see the [PurpleDrop Manual](https://purpledrop.readthedocs.io)

# PCB Design Documentation

Schematic print: [PurpleDrop_rev6.3_schematic.pdf](hardware/output/PurpleDrop_rev6.3_schematic.pdf)
Schematic print: [PurpleDrop_rev6.4_schematic.pdf](hardware/output/PurpleDrop_rev6.4_schematic.pdf)

Fab drawing: [PurpleDrop_rev6.3_fab.pfd](hardware/output/PurpleDrop_rev6.3_fab.pdf)
Fab drawing: [PurpleDrop_rev6.4_fab.pfd](hardware/output/PurpleDrop_rev6.4_fab.pdf)

Bill of Materials: [PurpleDrop_rev6.3_bom.csv](hardware/output/PurpleDrop_rev6.3_bom.csv)
Bill of Materials: [PurpleDrop_rev6.4_bom.csv](hardware/output/PurpleDrop_rev6.4_bom.csv)

![Front View](hardware/output/front_render.png)
![Back View](hardware/output/back_render.png)
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187 changes: 132 additions & 55 deletions hardware/HV_interface.sch
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Expand Up @@ -6,7 +6,7 @@ encoding utf-8
Sheet 2 5
Title "PurpleDrop Main Board"
Date "2021-11-09"
Rev "6.3"
Rev "6.4"
Comp "UW MISL"
Comment1 ""
Comment2 ""
Expand Down Expand Up @@ -4319,16 +4319,16 @@ Wire Wire Line
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Wire Wire Line
Expand All @@ -4343,79 +4343,156 @@ Connection ~ 6900 9350
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$EndComp
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L Device:C_Small C63
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L Device:D_Small D68
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0 1 1 0
$EndComp
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Wire Wire Line
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Wire Wire Line
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L power:GND #PWR0122
U 1 1 62C9B17B
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Wire Wire Line
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7000 10950 7000 10900
Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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$EndSCHEMATC
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38 changes: 19 additions & 19 deletions hardware/MCU.sch
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ encoding utf-8
Sheet 5 5
Title "PurpleDrop Main Board"
Date "2021-11-09"
Rev "6.3"
Rev "6.4"
Comp "UW MISL"
Comment1 ""
Comment2 ""
Expand Down Expand Up @@ -386,9 +386,9 @@ F 1 "510" H 9568 1955 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" H 9500 2000 50 0001 C CNN
F 3 "~" H 9500 2000 50 0001 C CNN
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F 5 "‎RMCF0603FT510RCT-ND‎" H 9500 2000 50 0001 C CNN "Digikey PN"
F 6 "‎RMCF0603FT510R‎" H 9500 2000 50 0001 C CNN "PN"
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F 5 "RMCF0603FT510RCT-ND" H 9500 2000 50 0001 C CNN "Digikey PN"
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F 7 "RES SMD 510 OHM 1% 1/10W 0603" H 9500 2000 50 0001 C CNN "Part Description"
1 9500 2000
1 0 0 -1
$EndComp
Expand All @@ -401,9 +401,9 @@ F 1 "510" H 9268 1955 50 0000 L CNN
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1 0 0 -1
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Expand Down Expand Up @@ -448,9 +448,9 @@ F 1 "510" H 9568 3005 50 0000 L CNN
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Expand All @@ -463,9 +463,9 @@ F 1 "510" H 9268 3005 50 0000 L CNN
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Expand Down Expand Up @@ -504,9 +504,9 @@ F 1 "510" H 9318 4005 50 0000 L CNN
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Expand Down Expand Up @@ -1209,9 +1209,9 @@ F 1 "510" H 9618 4005 50 0000 L CNN
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$EndComp
Expand Down
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