Antminer T21 BHB68701 hash board temperature sensing circuit working principle

This technical course covers the temperature monitoring system on the Antminer T21 BHB68701 hash board. Learn how dual S75 sensor chips (U7 at air outlet, U5 at air inlet) operate in parallel to monitor operating temperatures. The lesson details the serial bus communication protocol, and the complete 3.3V power delivery path from the control board through IO interface. Practical circuit tracing demonstrates the resistor networks and filtering components, while voltage measurement procedures verify proper operation of both sensors. Understanding this protection circuit is crucial for diagnosing thermal shutdown issues and maintaining optimal miner hardware performance.

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