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DS2760E-025 Datasheet(PDF) 7 Page - Dallas Semiconductor |
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DS2760E-025 Datasheet(HTML) 7 Page - Dallas Semiconductor |
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7 / 25 page  DS2760 7 of 25 Undervoltage. If the voltage of the cell drops below undervoltage threshold VUV for a period longer than undervoltage delay tUVD, the DS2760 shuts off the charge and discharge FETs, sets the UV flag in the Protection Register, and enters Sleep Mode. Overcurrent, Charge Direction. The voltage difference between the IS1 pin and the IS2 pin (VIS = VIS1 – VIS2) is the filtered voltage drop across the current sense resistor. If VIS exceeds overcurrent threshold VOC for a period longer than overcurrent delay tOCD, the DS2760 shuts off both external FETs and sets the COC flag in the Protection Register. The charge current path is not re-established until the voltage on the PLS pin drops below VDD – VTP. The DS2760 provides a test current of value ITST from PLS to VSS to pull PLS down when the offending charge current source has been removed. Overcurrent, Discharge Direction. If VIS is less than -VOC for a period longer than tOCD, the DS2760 shuts off the external discharge FET and sets the DOC flag in the Protection Register. The discharge current path is not re-established until the voltage on PLS rises above VDD - VTP. The DS2760 provides a test current of value ITST from VDD to PLS to pull PLS up when the offending low-impedance load has been removed. Short Circuit. If the voltage on the SNS pin with respect to VSS exceeds short circuit threshold VSC for a period longer than short circuit delay tSCD, the DS2760 shuts off the external discharge FET and sets the DOC flag in the Protection Register. The discharge current path is not re-established until the voltage on PLS rises above VDD - VTP. The DS2760 provides a test current of value ITST from VDD to PLS to pull PLS up when the short circuit has been removed. LITHIUM-ION PROTECTION CIRCUITRY EXAMPLE WAVEFORMS – Figure 3 (1) To allow the device to react quickly to short circuits, detection is actually done on the SNS pin rather than on the filtered IS1 and IS2 pins. The actual short circuit detect condition is VSNS > VSC. Sleep Mode VOV VCE VUV VCELL VIS charge discharge CC DC -VSC VOC -VOC 0 tSCD tOCD tOCD tUVD tOVD VPLS VDD active VSS VSS inactive tOVD (1) |
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