MSP430BT5190IZQWR — Bluetooth-optimized 16-bit MCU, now obsolete
It is supplied in a 113-ball VFBGA (Microstar Junior, 7x7 mm) package for surface-mount assembly.
Obsolete — last-time-buy and sourcing reality
This means Texas Instruments has discontinued production, and no further factory orders are accepted. Buyers should verify date code and condition at quote time.
256 kB Flash and 16K x 8 RAM — memory headroom for protocol stacks
The 256 kB Flash capacity is sized to hold a Bluetooth stack plus application code, leaving room for over-the-air update staging if the firmware architecture uses a swap or dual-bank scheme. The 16K x 8 RAM (16 KB) supports moderate data buffering for packet handling and sensor data logging. For designs that outgrow this memory envelope, a migration to a higher-density MSP430 or a Cortex-M0+ based Bluetooth MCU would be the typical next step.
Peripheral set and I/O count for wireless sensor nodes
The IrDA interface supports infrared data links for proximity or line-of-sight communication. The SCI (Smart Card Interface) is a less common feature that may be relevant for security token or payment-terminal designs.