Purpledrop
About the Purpledrop PCB
Purpledrop is an open source Microchip SAM PCB design by uwmisl, published on GitHub under the MIT license. It is a 4-layer board measuring 161 × 100 mm, with 253 components from 82 distinct parts.
Its main chip is the ATSAMG55J19A-AU, from the Microchip SAM family. Other key parts include the HV507PG-G, ADG836YRMZ, AD8040ARZ, PDSE1-S5-S9-S and MAX31865AA. By type, the board carries 68 diodes, 68 resistors, 61 capacitors, 22 ICs, 13 test points and 10 connectors.
From the project
Newest iteration of PurpleDrop. Reimplemented in kicad5
This holds the main board electronics design for PurpleDrop, a digital microfluidic device. The design is done in KiCad v5.x.
PurpleDrop is open-source, and you are welcome to build it as-is, or use it as a starting point for your own projects. If you are thinking about building your own PurpleDrop, you are encouraged to reach out first. This project is under active development, and there may be some recent updates or issues not yet reflected here that you should consider. This repository is maintained by Jeff McBride, who can be reached at mcbridej@cs.washington.edu.
Main components on the Purpledrop
Purpledrop bill of materials (BOM)
253 components, 82 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | HV507PG-G HV507 | PQFP-80 | U1, U2 |
| 1 | ADG836YRMZ ADG836YRM | MSOP-10_3x3mm_P0.5mm | U3 |
| 1 | AD8040ARZ AD8040 | SOIC-14_3.9x8.7mm_P1.27mm | U4 |
| 1 | PDSE1-S5-S9-S | PDSE1-S | U5 |
| 2 | MAX31865AA | MAX31865_SSOP-20_5.3x7.2mm_P0.65mm | U6, U7 |
| 1 | PCA9685PW | TSSOP-28_4.4x9.7mm_P0.65mm | U8 |
| 2 | MAX31865AA | MAX31865_SSOP-20_5.3x7.2mm_P0.65mm | U9, U21 |
| 1 | LTC4412ES6 LTC4412xS6 | TSOT-23-6 | U10 |
| 1 | LDL1117S33R | SOT-223-3_TabPin2 | U11 |
| 1 | LP2950CDT-5.0RKG | TO-252-2 | U12 |
| 1 | ACPL-C87B-000E ACPL-C870 | SSO-8_6.8x5.9mm_P1.27mm_Clearance8mm | U13 |
| 1 | AD8030ARZ AD8030 | SOIC-8_3.9x4.9mm_P1.27mm | U14 |
| 1 | AGH03P-5 | AGH03P | U15 |
| 1 | LM4041EEM3-1.2 LM4041L | SOT-23 | U16 |
| 1 | ATSAMG55J19A-AU | LQFP-64_10x10mm_P0.5mm | U17 |
| 3 | ACPL-024L-000E ACPL-024L | SOIC-8_3.9x4.9mm_P1.27mm | U18, U19, U20 |
| 1 | MAX1044CSA+T MAX1044 | SOIC-8_3.9x4.9mm_P1.27mm | U22 |
| 4 | IRLML6244TRPBF SSM3J328R | SOT-23 | Q1, Q2, Q3, Q4 |
| 1 | DMN62D0U-7 | SOT-23 | Q5 |
| 1 | FDD306P | TO-252-2 | Q6 |
Show 62 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | IPN60R2K1CEATMA1 Q_NMOS_GDS | SOT-223-3 | Q7 |
| 1 | ECS-.327-9-34QS 32.768kHz | ECS_34Q_2-SMD | Y1 |
| 2 | FTS-132-03-F-DV Conn_02x32_Odd_Even | SAMTEC-FTS-132-03-X-DV | J1, J2 |
| 1 | 1050170001 USB_B_Micro | USB_Micro-B_Molex-105017-0001 | J3 |
| 1 | RTD | PinHeader_1x08_P2.54mm_Vertical | J4 |
| 1 | Conn_02x04_Odd_Even | PinHeader_2x04_P2.54mm_Vertical | J7 |
| 1 | Conn_02x10_Odd_Even | PinHeader_2x10_P2.54mm_Vertical | J8 |
| 1 | PJ-002AH Barrel_Jack_Switch | BARREL_JACK | J9 |
| 1 | current shunt | PinHeader_1x02_P2.54mm_Vertical | J10 |
| 1 | AUX_IO_2 | PinHeader_2x04_P2.54mm_Vertical | J14 |
| 1 | AUX_IO_1 | PinHeader_2x05_P2.54mm_Vertical | J15 |
| 1 | GW12LJPCF | SW_NKK_GW12LJP | SW1 |
| 2 | Button | PTS645_SMT_SW | SW2, SW3 |
| 13 | DNP | TestPoint_Keystone_5000-5004_Miniature | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +5 |
| 64 | RRE04EA6DFH | SOT-23-5 | D1, D2, D3, D4, D5, D6, D7, D8 +56 |
| 2 | 3SMAJ5955B-TP 180v | D_SMA | D65, D66 |
| 1 | PMEG3030EP,115 | D_SOD-128 | D67 |
| 1 | CUS08F30 | D_SOD-323_HandSoldering | D68 |
| 4 | 0.01uF | C_0805_2012Metric | C1, C2, C5, C6 |
| 2 | C3216X7T2W104M160AA 0.1uF | C_1206_3216Metric | C3, C7 |
| 2 | CC0603KRX7R7BB104 0.1uF | C_0603_1608Metric | C4, C11 |
| 21 | 0.1uF | C_0603_1608Metric | C8, C9, C13, C14, C28, C29, C30, C31 +13 |
| 4 | CL10B105MO8NNWC 1uF | C_0603_1608Metric | C10, C21, C23, C60 |
| 1 | CL10B103KB8NFNC 10nF | C_0603_1608Metric | C12 |
| 3 | 10nF | C_0603_1608Metric | C15, C16, C17 |
| 2 | EEV107M025A9HAA 100uF | CP_Elec_6.3x5.9 | C18, C19 |
| 1 | 100PF 100pF | C_0603_1608Metric | C20 |
| 1 | C5750X7T2W105K250KA 1uF | C_2220_5650Metric_Pad1.97x5.40mm_HandSolder | C22 |
| 6 | 4.7uF | C_0603_1608Metric | C24, C25, C54, C55, C56, C57 |
| 1 | GRM188R61C475KAAJD 4.7uF | C_0603_1608Metric | C41 |
| 8 | CC0603KRX7R7BB102 1nF | C_0603_1608Metric | C42, C43, C44, C45, C46, C47, C48, C49 |
| 1 | DNP | C_1206_3216Metric | C52 |
| 1 | DNP | C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C53 |
| 2 | 0603N160J500CT 16pF | C_0603_1608Metric | C61, C62 |
| 1 | CC0603KRX7R7BB471 470pF | C_0603_1608Metric | C63 |
| 3 | RC0603JR-070RL 0 | R_0603_1608Metric | R1, R29, R41 |
| 5 | DNP | R_0603_1608Metric | R2, R3, R4, R42, R68 |
| 2 | 0 | R_0603_1608Metric | R5, R6 |
| 1 | TNPW060333R0BEEA 33 | R_0603_1608Metric | R7 |
| 2 | 4k02 | R_0603_1608Metric | R8, R9 |
| 7 | 10k | R_0603_1608Metric | R10, R11, R12, R13, R45, R46, R47 |
| 2 | RQ73C1J4K02BTD 4k02 | R_0603_1608Metric | R14, R57 |
| 1 | 220 | R_0603_1608Metric | R15 |
| 3 | 15K 15k | R_0603_1608Metric | R16, R18, R69 |
| 2 | ERJ-PB3B3002V 30k | R_0603_1608Metric | R17, R19 |
| 3 | ERA-3AEB102V 1k | R_0603_1608Metric | R20, R22, R65 |
| 1 | DNP | Potentiometer_Bourns_3296W_Vertical | R21 |
| 2 | ERA-3AEB152V 1.5k | R_0603_1608Metric | R23, R26 |
| 3 | ERA-3VEB4701V 4.7k | R_0603_1608Metric | R24, R40, R44 |
| 1 | ERJ-3RQF3R3V 3.3 | R_0603_1608Metric | R25 |
| 1 | ERA-3AEB222V 2.2k | R_0603_1608Metric | R27 |
| 1 | 47K 47k | R_0603_1608Metric | R28 |
| 4 | P20891 412k | R_0805_2012Metric | R30, R31, R32, R33 |
| 1 | ERA-3AEB6651V 6.65k | R_0603_1608Metric | R34 |
| 5 | 47k | R_0603_1608Metric | R35, R36, R37, R38, R39 |
| 1 | 100K 100k | R_0603_1608Metric | R43 |
| 2 | 4.7k | R_0603_1608Metric | R48, R49 |
| 5 | 510 | R_0603_1608Metric | R50, R51, R52, R53, R54 |
| 4 | 150 | R_0603_1608Metric | R55, R56, R61, R62 |
| 2 | RC0603JR-0710KL 10k | R_0603_1608Metric | R58, R70 |
| 2 | 510 | R_0603_1608Metric | R63, R71 |
| 2 | ERJ-3EKF33R0V 33 | R_0603_1608Metric | R66, R67 |
Purpledrop design files
The KiCad project lives in the uwmisl/purpledrop repository on GitHub; these links point at the commit this page was built from.
Purpledrop: common questions
What microcontroller does the Purpledrop use?
The Purpledrop is built around the ATSAMG55J19A-AU, from the Microchip SAM family.
How big is the Purpledrop PCB?
The Purpledrop measures 161 × 100 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Purpledrop?
253 components, from 82 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Purpledrop design files?
From the uwmisl/purpledrop repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Purpledrop design in my own project?
Yes, under the terms of its MIT license, which uwmisl chose for the repository.
Can I test firmware for the Purpledrop without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Microchip SAM firmware against it before you order a PCB.
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