Cypress CY8C24794 manuals
Power Tools > Battery Charger
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Cypress CY8C24794 Specifications
21 pages 681.97 Kb
Power Management - Low-Cost, Two-Cell Li-Ion/Li-Pol Battery Charger with Cell-Balancing Support AN2309 Software Version: PSoC Designer 5.0 SP1 Associated Project: Yes Author: Oleksandr Karpin Associated Part Family: CY8C24x23A, CY8C24794, CY8C27x43, CY8C29x66 Associated Application Notes: AN2107, AN2258, AN2267, AN2294 PSoC Application Notes Index Application Note Abstract Introduction Reduced overall battery pack capacity to the value of Reduced overall battery pack life. The charge or Cell damage, which occurs if the charger monitors only Cell-Balancing Foundation 12 QQ cell cell Q I t C VQ C V C V cell cell cell cell CC cell cell 2 Variations in cell assembly. Todays factory Different rates in cell degradation. The self-degradation 3 Temperature gradient across the battery pack. Variations in self-discharge rates. Even at room RloadRdischargeN Icharge IchargeN RQN RN VcellN IbalN Variations in internal cell impedance. These impedance VcellN IbalN RR N QNI I I chargeN charge balN ()R R R N QN load RdischargeN R R R N QN load Amount of Imbalance: This factor is described earlier 4 Cell Balancing Time: If C is the cell capacity and Cell Capacity: If n is the count of cells connected in Cn Ibal 2000 2 15% 600 mAh I mA bal 4.2 /100 42I V mA bal Two-Cell Battery Charger Hardware 6 Device Schematic 8 PSoC Device Internals9 Battery Measurementmax max Vref Gina Ibat nV G I R ADC ina I bat sense n n n VV ref ref n n n n meas offset bias max I 10 nV G V ADC ina V bat n n n VV ref ref nAGND Rterm VREFHI nnew Gina V1 7 1 6 VR R 4.2 _ 4.2 _ nV new nn new old nV old21 Rref V V V t t AGND RR ref term 21 Rterm n n n t t AGND RR ref term 2 Vt Two-Cell Battery Charger FirmwareTwo-Cell Battery Charger Algorithm 11 Wait For Temperature: Used to depict the idle state Error: Indicates that during the charge process an error Discharge: Indicates that the battery pack discharge Full Discharge: Indicates that the battery pack is
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