The Peltier Click is a Click board™ which utilizes the SPV1050, an ultralow power energy harvester and battery charger from STMicroelectronics. The Peltier Click can charge lithium battery using thermoelectric energy harvesting device (TEG). A TEG converts heat directly into electrical energy according to the Seebeck effect. It can be used for a variety of applications such as WSN, HVAC, building and home automation, industrial control, remote metering, lighting, security, surveillance, wearable and biomedical sensors and fitness.

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

The Peltier element is not included in the Click board package, if you want to buy one please the hookup accessories section below.

The Peltier Click is based on the SPV1050, an ultralow power energy harvester and battery charger from STMicroelectronics that can charge lithium based batteries. A thermoelectric harvester produces green energy for energy harvesting with a multitude of advantages: maintenance-free, because of the use of highly reliable and compact solid-state device; silent and quiet; highly efficient in environmental terms because the heat is harvested from waste heat sources and converted into electricity. Because of this feature, the Peltier Click can be used for a variety of applications such as WSN, HVAC, building and home automation, industrial control, remote metering, lighting, security, surveillance, wearable and biomedical sensors and fitness.

The SPV1050 is an ultralow power and highefficiency energy harvester and battery charger, which implements the MPPT function and integrates the switching elements of a buck-boost converter. The SPV1050 device allows the charge of lithium battery, by tightly monitoring the end-of-charge and the minimum battery voltage in order to avoid the overdischarge and to preserve the battery life. The power manager is suitable for TEG harvesting sources, as it covers the input voltage range from 75 mV up to 18 V and guarantees high efficiency in both buck-boost and boost configuration.

Furthermore the SPV1050 device shows very high flexibility thanks also to the trimming capability of the end-of-charge and undervoltage protection voltages. In such way any source and battery is matched. The MPPT is programmable by a resistor input divider and allows maximizing the source power under any temperature and irradiance condition.

Some of the key features of the SPV1050 are its transformerless thermoelectric generators and PV modules energy harvester, high efficiency for any harvesting source and it has up to 70 mA maximum battery charging current. It is fully integrated buck-boost DC-DC converter with a programmable MPPT by external resistors, 2.6 V to 5.3 V trimmable battery charge voltage level (± 1% accuracy), 2.2 V to 3.6 V trimmable battery discharge voltage level (± 1% accuracy) with two fully independent LDOs (1.8 V and 3.3 V output). The SPV1050 can enable/disable LDO control pins and it has a battery disconnect function for battery protection, and while the battery is connected and ongoing charge logic open drain indication pins.

The SPV1050 is basically an ultralow power energy harvester with an embedded MPPT algorithm, a battery charger and power manager designed for applications up to about 400 mW.

• Interface: GPIO
• Compatibility: mikroBUS™
• Dimensions: 42.9 x 25.4mm
• Input Voltage: 3.3V
• Maximum battery charging current: 70mA
• BATT pin voltage range: Min. 2.2V, Typ. 4.2V, Max. 5.3V
• MPPT tracking period: Min. 12S, Max. 20S

• Schematic
• SPV1050 Datasheet
• mikroSDK
• GitHub