Test fixture · MB-EXP-0003

SD / microSD Tap

An SD/microSD interposer for observing card communication and card current while the host and card operate.

To be announcedPricing

SKU MB-EXP-0003

SD/microSD interposer with logic and card-current observation outputs.

Connections

Host and card: Use the interposer between the host interface and the card under test. Confirm mechanical fit and the applicable card connection.
Logic header: Connect CLK, CMD and the required data lines to a logic analyser with suitable 1.8 V thresholds and a common reference.
I CARD: Connect the current-sense voltage output to a suitable voltage input; the nominal design scale is 5 V/A.

Host, compatible SD or microSD card and the appropriate physical connection.

A logic analyser and matching header leads for communication, plus a scope or voltage meter for current observation.

Choose decoding that matches the captured card mode. This interposer does not add an SD decoder or change the host/card protocol.

Signal connections, output scales and measurement requirements.
Parameter	Specification	Detail
Format	Standalone assembled board	SD/microSD interposer design
Observed signals	CLK, CMD and D0–D3	Logic observation header
Logic outputs	Nominal 1.8 V logic	Board label; configure compatible thresholds
Additional observation	Power and card-detect signals	Header definition
Card-current output	Nominal 5 V/A	Voltage output for a scope or meter

Select a decoder for the card protocol in use. The SPI flash bench is for serial NOR flash, not SD-card transactions.