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MAX17710_1110 Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX17710_1110 Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 8 page SEL1 JU4 SHUNT POSITION REG (V) BATT 1-2 1.8 GND 2-3 2.3 Unconnected Not installed* 3.3 _________________________________________________________________ Maxim Integrated Products 4 MAX17710 Evaluation Kit Evaluates: MAX17710 Charger The CHG test point monitors the CHG pin. The CHG test point is connected to the output of the boost regulator and the CHG pin is the input to the battery charger. The IC charges the MEC based off the voltage on the CHG test point. The power sources to the CHG test point can come from solenoid, piezo, mechanical, or RF sources, and must exceed the MEC voltage. When CHG exceeds the MEC voltage by 50mV, the IC uses the CHG supply to charge the on-board MEC. The IC is designed to use input supplies from energy-harvesting sources, which are highly variable, poorly regulated, and usually power- limited. Apply the variable input supply source to the AC+ and AC- test points. The power source is rectified and supplied to the CHG test point through the full-wave bridge diode (D2). Internal Boost For power sources that are lower than the battery voltage, such as solar or the above-mentioned sources, the IC features a boost converter to step up the voltage to charge the on-board MEC. The output of the boost is the CHG test point. The IC uses the voltage on the CHG test point to charge the MEC. An additional power source can be present on CHG through the AC+ and AC- test points while the boost is active. Figure 1 shows the CHG test-point voltage observed on an oscilloscope with ambient light using the on-board solar cells as the power source. The number of pulses increase as the EV kit is brought closer to the light source and decrease when taken away from the light source. Power Sources The on-board power source is a parallel connection of three solar cells. The voltage can be monitored on the SOLAR+ and GND test points. The start-up voltage for the IC boost is approximately 750mV at the FB pin. To supply an external power source, remove the shunt from jumper JU3 and apply the power source to the SOLAR+ and GND test points. On-Board Micro-Energy Cell (BATT) The EV kit features the THINERGY micro-energy cell (MEC) from IPS as the on-board energy storage cell. The MEC101 included on the EV kit is roughly the size of a postage stamp and is soldered directly to the board. The BATT footprint can also accommodate the MEC201. Caution: The MEC case is conductive. To protect the MEC, do not touch the MEC with conductive material. MEC Pack Power The IC has a regulator output and battery pack output (PCKP) to provide power to external loads. The IC PCKP test point provides the MEC voltage to external loads while the REG test point provides a regulated voltage (Table 3). External unregulated loads from the MEC should always be connected through the PCKP test point. External loads connected directly from the MEC can cause irreversible damage to the MEC if the voltage goes too low. LED Indicator On Pack Power The D5 LED is connected through a digital FET at the PCKP test point. The LED blinks as pulses are generated at the CHG test point. The LED is a visual display that the boost regulator is operating. Logic Inputs The EV kit provides various pushbutton switches and test points to evaluate the device. There are two regulators internal to the IC, which are available through AE and LCE. AE controls the default regulator and LCE controls the low-current regulator. Regulator Output Enable (AE) The IC features a default regulator that can be enabled by the AE signal. Press the S1 switch to connect PCKP and enable the default regulator. Press the S2 switch to disconnect PCKP and disable the default regulator output. The output voltage is selected by jumper JU4 (see Table 3). If the MEC voltage drops below 2.15V, the AE and PCKP outputs are disabled until a charger is applied. Low-Current Mode Enable (LCE) The IC features a low-current regulator that reduces the quiescent current by a factor of 5. The low-current regulator can be enabled by the LCE and AE signals. To enter the low-current mode, first turn on the default regulator by pressing S1, then press S3 to enable the low-current regulator, and finally turn off the default regu- lator by pressing S2. Afterwards, press S4 to disable the low-current regulator. If low-current mode is enabled, pressing S1 enables the default regulator, but pressing S2 switches back to the low-current regulator if originally enabled. If the MEC voltage drops below 3V, the AE and PCKP outputs are disabled until a charger is applied. Regulator Output Voltage (SEL1) Table 3 shows the regulator output options. SEL1 is con- nected to jumper JU4. The regulator output is locked when the regulator is active. To change the regulator output voltage, first change the setting on jumper JU4 to obtain the desired output voltage (Table 3), then press S2 and S4 to disable both the default and low-current regulators. Lastly, press S1 to enable the default regula- tor and optionally S3 to enable the low-current regulator. The regulator output voltage can be monitored on the REG test point and outputs the new voltage. Table 3. Regulator Output Voltage (SEL1) *Default position. |
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