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sensor:energy_harvesting [2025/04/27 20:07] – vamsansensor:energy_harvesting [2025/04/27 20:27] (current) – vamsan
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 One of the first examples of ambient energy being used to produce electricity was the successful use of electromagnetic radiation (EMR) to generate the crystal radio. One of the first examples of ambient energy being used to produce electricity was the successful use of electromagnetic radiation (EMR) to generate the crystal radio.
 +===== LTC-3588 Features =====
 +**V<sub>IN</sub>:** –0.3V to 18V (has an internal 20V clamp) \\
 +**I<sub>SW</sub>:** 0A .. 25mA \\
 +**PZ1, PZ2:** 0V .. V<sub>IN</sub> \\
 +**D0, D1:** –0.3V .. [Lesser of (V<sub>IN2</sub> + 0.3V) or 6V] \\
 +**CAP:** [Higher of –0.3V or (V<sub>IN</sub> – 6V)] .. V<sub>IN</sub> \\
 +**V<sub>IN2</sub>:** –0.3V .. [Lesser of (V<sub>IN</sub> + 0.3V) or 6V] \\
 +**V<sub>OUT</sub>:** –0.3V .. Lesser of (V<sub>IN2</sub> + 0.3V) or 6V \\
 +**PGOOD:** –0.3V to Lesser of (V<sub>OUT</sub> + 0.3V) or 6V \\
  
 +===== Pin functions =====
 +
 +{{ :sensor:ltc_3588_6.png |LTC-3588 block diagram}}
 +
 +  * **PZ1 (Pin 1):** Input connection for piezoelectric element or other AC source (used in conjunction with PZ2). 
 +  * **PZ2 (Pin 2):** Input connection for piezoelectric element or other AC source (used in conjunction with PZ1). 
 +  * **CAP (Pin 3):** Internal rail referenced to VIN to serve as gate drive for buck PMOS switch. A 1µF capacitor should be connected between CAP and VIN. This pin is not intended for use as an external system rail. 
 +  * **VIN (Pin 4):** Rectified Input Voltage. A capacitor on this pin serves as an energy reservoir and input supply for the buck regulator. The VIN voltage is internally clamped to a maximum of 20V (typical). 
 +  * **SW (Pin 5):** Switch Pin for the Buck Switching Regulator. A 10µH or larger inductor should be connected from SW to VOUT. 
 +  * **VOUT (Pin 6):** Sense pin used to monitor the output voltage and adjust it through internal feedback. 
 +  * **VIN2 (Pin 7):** Internal low voltage rail to serve as gate drive for buck NMOS switch. Also serves as a logic high rail for output voltage select bits D0 and D1. A 4.7µF capacitor should be connected from VIN2 to GND. This pin is not intended for use as an external system rail. 
 +  * **D1 (Pin 8):** Output Voltage Select Bit. D1 should be tied high to VIN2 or low to GND to select desired VOUT (see Table 1). 
 +  * **D0 (Pin 9):** Output Voltage Select Bit. D0 should be tied high to VIN2 or low to GND to select desired VOUT (see Table 1). 
 +  * **PGOOD (Pin 10):** Power good output is logic high when VOUT is above 92% of the target value. The logic high is referenced to the VOUT rail. 
 +  * **GND (Exposed Pad Pin 11):** Ground. The Exposed Pad should be connected to a continuous ground plane on the second layer of the printed circuit board by several vias directly under the LTC3588-1.
 ===== LTC-3588 Nanopower Energy Harvesting Power Supply ===== ===== LTC-3588 Nanopower Energy Harvesting Power Supply =====
 {{anchor:ltc_3588}} {{anchor:ltc_3588}}