SMART TECH & IOT
Since both operating current and shutdown current are extremely low, it can be placed on a main board of any smart IoT devices as well as in a battery pack.
2) This battery protection system is activated
or turned on by applying a voltage (VON) to the VOUT pin (See Figure 3). The VON comes from a charger IC output when a charger (or
a charging function of a PMIC) is connected and starts working. When a battery cell is connected, the system doesn’t work until the
VON is applied in order to prevent a battery cell from discharging immediately. 3) GLF73xxx family products share the common ground with the system so that this solid ground connection assures system stability and helps engineers to obtain reliable data during their system measurement and debugging.
A unique feature of Shipping Mode can greatly extend the battery life dramatically for warehouse storage and shipping, especially long-duration shipping. A deep sleep function of the IC in the battery-protection system allows disconnection of the battery from the system load, such as when finishing the final board test and placing the device into storage prior to shipment or starting shipping. A short pulse voltage will make system entering the shipping mode which puts an IC in deep sleep consuming almost zero current. When the smart device enters deep sleep mode, especially those with a non- removable battery, will be protected from discharging during the shipping period without adding any extra peripheral circuitry. This battery protection chip remains off state and consumes an ultra-low leakage
current (ISD) until the VON voltage is applied to VOUT pin to release the system from Shipping Mode.
Figure 5: The figure 5 on the left shows the operation of battery protection IC like GLF73xxx family products.
“
The GLF73xxx product family ensures that rechargeable lithium battery cells are safely charged and supply power to downstream systems,” said Eileen Sun, President and CEO at GLF Integrated Power. “It also prevents devices with non-removable batteries from discharging during shipping. This ultra-compact, high- performance IC is ideal for use in IoT, wearables and other tiny-form- factor electronics.
Application Example Different behaviours when connecting a battery cell to systems:
1). When a battery cell is attached, the GLF73xxx ICs is not activated. The VOUT node remains grounded.
2). When an on voltage (VON) is applied to the VOUT pin, the IC is activated to be ready to supply power without any electrical noises.
Shipping Mode:
1) Applying a pulse of 1.2 VMIN with 20 ms duration to the SM pin makes the IC turned off to enter the SM mode in preset 600 ms.
2) When the VON voltage is applied to VOUT, the IC resumes normal operation.
” Figure 6: The figure 6 on the left shows the operation of shipping mode function. 34 APRIL 2024 | ELECTRONICS FOR ENGINEERS
What’s Next in Smart IoT Power Energy harvested from light or thermal sources can be stored in ultracapacitors to replace or supplement the power from rechargeable batteries. Advances in energy harvesting technologies are starting to have an impact on wearable smart IoT devices. The application of this technology demands the use of high-performance battery-protection ICs that exhibit very low (µA) operating mode and low nA leakage when in the OFF state. An integrated battery- protection design approach is well-suited to meet these design requirements.
Conclusion
The rapidly expanding and evolving smart IoT ecosystem has changed the requirements for protecting rechargeable batteries and limiting battery discharge during standby states. Among the most significant requirements for smart IoT devices is battery life. Moreover, the emergence of new rechargeable battery technologies and energy harvesting techniques are increasingly being used to address this requirement.
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