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DS2762AE Datasheet(PDF) 10 Page - Maxim Integrated Products |
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DS2762AE Datasheet(HTML) 10 Page - Maxim Integrated Products |
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10 / 25 page  DS2762 High-Precision Li+ Battery Monitor With Alerts 10 of 25 register, and enters sleep mode. The DS2762 provides a current-limited (IRC) recovery charge path from PLS to VDD to gently charge severely depleted cells. The recovery path is enabled when 0 £ VDD < 3V (typ). Once VDD reaches 3V (typ), the DS2762 returns to normal operation, awaiting connection of a charger to turn on the charge FET and pull out of 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 DS2762 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 DS2762 provides a test current of value ITST from PLS to VSS to pull PLS down to detect the removal of the offending charge current source. Overcurrent, Discharge Direction. If VIS is less than -VOC for a period longer than tOCD, the DS2762 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 DS2762 provides a test current of value ITST from VDD to PLS to pull PLS up to detect the removal of the offending low-impedance load. 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 DS2762 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 DS2762 provides a test current of value ITST from VDD to PLS to pull PLS up to detect the removal of the short circuit. Figure 3. Li+ Protection Circuitry Example Waveforms Summary. All of the protection conditions described above are ORed together to affect the CC and DC outputs. DC = (Undervoltage) or (Overcurrent, Either Direction) or (Short Circuit) or (Protection Register Bit DE = 0) or (Sleep Mode) CC = (Overvoltage) or (Undervoltage) or (Overcurrent, Charge Direction) or (Protection Register bit CE = 0) or (Sleep Mode) 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 (NOTE 1) NOTE 1: TO ALLOW THE DEVICE TO REACT QUICKLY TO SHORT CIRCUITS, DETECTION OCCURS ON THE SNS PIN RATHER THAN ON THE FILTERED IS1 AND IS2 PINS. THE ACTUAL SHORT-CIRCUIT DETECT CONDITION IS VSNS > VSC. |
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Similar Description - DS2762AE |
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