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CBC3150-D9C-WP Datasheet(PDF) 2 Page - Cymbet Corporation |
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CBC3150-D9C-WP Datasheet(HTML) 2 Page - Cymbet Corporation |
2 / 8 page EnerChip™ CC Inductive Charging Evaluation Kit ©2012-2014 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com DS-72-14 Rev D Page 2 of 8 System Description CBC-EVAL-11 (Figure 3) is an inductive RF charger for the CBC3150 with integrated energy storage management and energy harvesting emulation. The CBC-EVAL-11 system consists of an inductive wireless transmitter module tuned to a frequency of 13.56MHz and an inductive wireless charger (receiver) module. The transmitter module is designed to be powered by a computer USB port as shown in Figure 4. The wireless inductive charger module consists of a planar inductor fabricated on the printed circuit board in parallel with a variable capacitor. This circuit forms a resonant tank circuit tuned to a frequency of 13.56 MHz, which in turn feeds the AC input of a full-wave bridge rectifier. The DC output of the rectifier is filtered by a capacitor and clamped by a Zener diode. The DC output is then regulated by a linear regulator to 3.3V and fed to the input of the Cymbet CBC3150. The CBC3150 has a power management circuit and a 50µAh thin film EnerChip rechargeable cell. When the CBC-EVAL-11 receiver antenna is placed near a magnetic field at a frequency of 13.56MHz, and if the voltage at the CBC3150 VDD pin is greater than 3.0V, the CBC3150 will route the harvested power directly to the energy harvesting connectors. In this mode of operation the CBC3150’s RESET/ line will be high, the LED will be illuminated, and the CHARGE/ indicator on the energy harvesting connectors will be low. In this mode, the integrated EnerChip solid state energy storage device will charge from a completely depleted state to 80% of full charge within 30 minutes. When the CBC-EVAL-11 unit is removed from the magnetic field and the input voltage to the CBC3150 drops below 3.0V, the RESET/ line will go low, the LED will be off, and EnerChip power will be routed to the energy harvesting connector. The CHARGE/ indicator on the energy harvesting connectors will be forced high. For additional energy storage capacity, up to 9 additional CBC050 EnerChip storage devices may be connected to the VBAT pin of the CBC3150. A second handshake line on the energy harvesting connector - BATOFF - is an input that can be used by the application controller to disable the CBC3150 energy storage charging circuitry. When the BATOFF line is driven high, the ENABLE input on the CBC3150 will be driven low, disabling the energy storage device charger circuits. This feature promotes a long service life of the EnerChip by removing the charging voltage from the EnerChip terminals when the EnerChip is fully charged. Due to the low self-discharge of the EnerChip, it is not necessary to constantly charge the cell when not in use. With the functions and connector pins available on the CBC-EVAL-11, an external load such as a radio and microcontroller (MCU) can be powered when in inductive charging mode, or directly from the CBC3150 EnerChip CC device on the CBC-EVAL-11 receiver board. For example, the radio/MCU board illustrated in Figure 3 is a wireless end device available from Texas Instruments, as part of the eZ430-RF2500-SEH MSP430 Solar Energy Harvesting Development Tool. Other low power radios and MCUs can also be connected to either the 6-pin right-angle connector, or the 5-pin straight header connector on the CBC-EVAL-11 receiver board. Note: The shorting jumper provided with the wireless charger (receiver) board should be placed across pins 1 and 2 of the 3-pin header. This connects the CBC3150 charge pump output (VCHG) to the positive terminal of the EnerChip (VBAT) to allow the EnerChip to charge when input power is available to the CBC3150. Do not place the shorting jumper across pins 2 and 3 of the 3-pin header. Pin 1 is indicated by the square solder pad on the bottom of the receiver board. Also, the J5 silkscreen label on the top of the board is adjacent to pin 1. The output of the CBC3150 is filtered by a 1000µF capacitor. This value of capacitor is only needed for applications that require high pulse currents such as a ZigBee radio. A short tutorial on specifying output capacitance for a given pulse current is given at the end of this section. A full Application Note on this topic - AN-1025: Using the EnerChip in Pulse Current Applications - is available from Cymbet. The wireless inductive transmitter (Figure 5) consists of a DC-DC converter to boost the 5VDC input to 9V. A crystal oscillator is used to generate a 13.56MHz clock, which in turn is used to drive several buffers and a transistor driver that drives a planar inductor and series capacitor, forming a series resonate tank circuit tuned to a frequency of 13.56MHz. Specifications for the EnerChip embedded in the EnerChip CC CBC3150 are given in the table below. Full specifications for the EnerChip CC CBC3150 are available at www.cymbet.com. |
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