
DD Compute 2
Acmex2564/Z31-DigiDash
Reverse Engineering of the 300zx (Z31) Digital Cluster & Design of replacement PCBs

AWSR upgrade on ZCU111 and nonlinear characterization
Interposer is an open-source printed circuit board by johnmmower, from the johnmmower/AWSR_1M repository on GitHub. It is a 4-layer board of 64 × 45 mm with 38 parts on 30 nets, routed with 132 tracks and 56 vias.
It is built around the SN74LV1T34DCK, SP3485EN-Y and 74LV1T87GXH, with the SN74S140D among its other parts. Its parts include 19 capacitors, 8 ICs, 6 connectors and 1 resistor.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 10u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C3, C5, C7, C9, C10, C12, C13, C14, C15, C16, C17, C18, C19 |
| 5 | .1u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C4, C6, C8, C11 |
| 3 | Conn_01x02 | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J4, J5, J7 |
| 3 | SP3485EN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1, U2, U3 |
| 1 | 3.3 | Package_TO_SOT_THT:TO-220F-3_Vertical | U7 |
| 1 | 49.9 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 5 | Package_TO_SOT_THT:TO-220F-3_Vertical | U8 |
| 1 | 74LV1T87GXH | Package_SO:TSOP-5_1.65x3.05mm_P0.95mm | U6 |
| 1 | Conn_01x03_Pin | Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J3 |
| 1 | Conn_01x05_Pin | Connector_Molex:Molex_KK-254_AE-6410-05A_1x05_P2.54mm_Vertical | J1 |
| 1 | Conn_02x06_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Vertical | J8 |
| 1 | SN74LV1T34DCK | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U4 |
| 1 | SN74S140D | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U5 |
The 34 most common of 38 parts.
It measures 64 × 45 mm and has 4 copper layers, 1.6 mm thick.
38 parts, built around the SN74LV1T34DCK, SP3485EN-Y, 74LV1T87GXH and SN74S140D. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the johnmmower/AWSR_1M repository on GitHub, at the commit this page was made from: the board is hardware/interposer/interposer/interposer.kicad_pcb and its schematic hardware/interposer/interposer/interposer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask johnmmower before reusing the design.

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