Proximity 17 Click is a compact add-on board that contains a close-range proximity sensing solution. This board features the TMD2635, a miniature proximity sensor module from ams AG. The TMD2635 features advanced proximity measurement in a tiny and thin optical land grid array module that incorporates a 940nm infrared vertical-cavity surface-emitting laser (IR VCSEL) factory calibrated for IR proximity response. It also offers advanced crosstalk noise cancellation through a wide range of offset adjustments through a digital fast-mode I2C interface to compensate for unwanted IR energy reflection at the sensor. This Click board™ is suitable for consumer and industrial applications.

Proximity 17 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

Proximity 17 Click as its foundation uses the TMD2635, a miniature close-range proximity sensor module from ams AG. The TMD2635 implements a 940nm infrared VCSEL (Vertical Cavity Surface Emitting Laser) factory calibrated for IR proximity response, alongside a digital I2C serial interface. The proximity detection feature provides object detection (e.g., close proximity) by photodiode detection of reflected IR energy sourced by the integrated VCSEL emitter. The proximity engine also features a wide range offset adjustment to compensate for unwanted IR energy reflection at the sensor. The results are further improved by automatic ambient light subtraction.

The TMD2635 does not require a specific Power-Up sequence but requires a supply voltage of 1.8V to work correctly. Therefore, a small regulating LDO is used, the MAX8511, providing a 1.8V out of both 5V and 3.3V mikroBUS™ power rails. Also, it can be shut down through software with a low standby current, allowing the power rails to remain powered at all times.

Proximity 17 Click communicates with MCU using the standard I2C 2-Wire interface with a maximum clock frequency of 400kHz, fully adjustable through software registers with a 14-bit proximity result stored in a PDATA register. Since the sensor for operation requires a power supply of 1.8V, this Click board™ also features the PCA9306 and SN74LVC1T45 voltage-level translators. The I2C interface bus lines are routed to the voltage-level translators allowing this Click board™ to work with both 3.3V and 5V MCUs properly. Also, it uses an interrupt pin, the INT pin of the mikroBUS™ socket, used for when an interrupt occurs to alert the system when proximity result crosses upper or lower threshold settings.

This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. However, the Click board™ comes equipped with a library that contains easy-to-use functions and an example code that can be used, as a reference, for further development.

• Interface: I²C
• Compatibility: mikorBUS™
• Dimensions: 28.6 x 25.4mm
• Input Voltage: 3.3V or 5V
• Wavelength: 940nm
• Operating Temperature Range: Min. -30°C, Typ. +25°C, Max. +85°C

• Schematic
• MAX8511 Datasheet
• PCA9306 Datasheet
• SN74LVC1T45 Datasheet
• TMD2635 Datasheet
• mikroSDK
• LibStock