TGP-751 datasheet(13/35 Pages) ETC2

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Micropelt - preliminary - Datasheet TE-CORE /RF v1.4 | Page 13

Thermoharvesting Wireless Sensor System

Micropelt TE-CORE /RF

3.1.8 TGP output voltage measurement

The direct output voltage of TGP will be read at

port P0_1 of the CC2530 CPU (voltage divider of 1:1).

A special circuitry is used to monitor the open circuit

output voltage of the TGP and to analyze thereby the

harvested output power. The oscillation circuit of the

DC-DC Booster is shortly interrupted by transistor T2

and the TGP output voltage is being connected to the

ADC of the CPU. This interruption is being realized by

pulling a 30 kOhm resistor R10 to ground via control

transistor T3. The time constant for this function toff can

be set by an RC combination (C5, R10) and should be

kept longer as the required measurement time of the

ADC.

(Eq. 5)

Yellow - IO Voltage (GPIO2)

Yellow - IO Voltage

Cyan - Booster Input voltage

Cyan - Voltage Pin 2 at

capacitor C5

Direct output voltage measurement at TGP

µF

kOhm

off











3.1.9 Temperature sensor

Absolute temperature of the TGP generator is meas-

ured by a digital temperature sensor from Texas Instru-

ment TMP102.

The temperature sensor is located next to the “cold

side” of the TGP and connected via a cupper sheet.

Since the temperature gradient is directly proportional

to the open circuit voltage of the TGP, the hot side

temperature can be calculated and thereby the temper-

ature gradient over the TGP generator, according equi-

tation 6.

(Eq. 6)

Temperature sensor TMP102

]

[

110

]

[

]

[

]

[

Uocv

Tcold

Thot











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