What the LSPM 2 does that a general-purpose ASIC cannot
The Siemens 6ES7195-0BA21-0XA0 is the LSPM 2 ASIC — a dedicated PROFIBUS DP slave controller that handles the full DP protocol stack in hardware, so no external microprocessor is required for bus access. Rated for simple slave applications, it manages up to 32 I/O bytes and supports automatic baud-rate detection up to 12 Mbit/s, the top speed for PROFIBUS DP. The 0.35 W power draw at 5 VDC and the -40 to 75 °C operating range mean it fits into compact, passively-cooled slave nodes without a heatsink, even on a warm backplane.
Physical package and integration constraints
Housed in an 80-pin MQFP with a 4 cm² footprint, the LSPM 2 is a surface-mount ASIC that reflows onto the slave-node PCB — no socket, no separate firmware load (scope of firmware: not necessary). Supplied in tray-boxes of 330 pieces, this is a production-volume part; for prototype or repair quantities, confirm the BOM position count before committing.
No official successor or pin-compatible cross-reference is listed — the part is the designated slave controller for this generation of SIMATIC S5/S7 DP nodes.