Zettasensing ZSFS1001M-WL

ZSFS1001 integrates a MEMS strain sensing element with a signal processing circuit, and outputs via I2C a digital signal proportional to the deformation caused by the pressure applied to the chip. When configured in autonomous key mode, the built-in recognition algorithm outputs a simple high/low logic level based on press events — no MCU required. The product is designed to replace traditional mechanical keys, targeting applications such as smartphone frames, earphones, electric toothbrushes, and other wearable or mobile devices where press actions are detected by sensing elastic deformation. For array applications such as tactile sensing or electronic skin, ZSFS1001 offers significant advantages over conventional resistive or capacitive arrays: 1) digital signal transmission provides strong immunity to EMI; 2) compatible with any surface material; 3) multi-mode sensing; 4) automatic sensing and event-triggered wake-up; 5) ultra-low power consumption. ZSFS1001 consists of a MEMS strain sensing element, a main ADC, a FIFO buffer, and a temperature sensor, with a system clock of 32kHz. The ADC is enabled by default and can be turned on/off via the ADC_DIS register. ZSFS1001 can output a digital code stream representing the magnitude of strain, or be configured to detect press events only and output a high/low logic level.

• ZS DirectADC monolithic integrated strain sensor with integrated MEMS strain sensor and signal processing circuit
• WLCSP package, ultra-compact footprint: 1.42×1.42mm
• High sensitivity
• High linearity
• Ultra-low operating current: <4μA (10Hz slot mode)
• Built-in button algorithm detection; configured in autonomous button mode, strain detection and digital output without MCU
• I²C interface for configuration and signal readout to obtain specific strain values
• Built-in strain self-calibration
• Temperature compensation
• Digital temperature output
• Wide detectable range
• Reflow soldering compatible
• Tape and reel packaging
• Wide operating temperature range: -40~85℃
• Operating voltage range: 1.75~3.6V

• Drop-in replacement for all traditional mechanical button applications
• Press and slide detection in consumer electronics
• Touch keys for white goods appliances
• Tactile sensing and electronic skin for intelligent robots
• Force sensors
• Automotive electronics