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DS2778 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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DS2778 Datasheet(HTML) 11 Page - Maxim Integrated Products |
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11 / 44 page  2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with Protector and Optional SHA-1 Authentication ______________________________________________________________________________________ 11 Li+ Protection Circuitry During active mode, the DS2775–DS2778 constantly monitor SNS, VIN1, VIN2, and PLS to protect the battery from overvoltage (overcharge), undervoltage (overdis- charge), and excessive charge and discharge currents (overcurrent, short circuit). Table 1 summarizes the conditions that activate the protection circuit, the response of the DS2775–DS2778, and the thresholds that release the DS2775–DS2778 from a protection state. Figure 3 shows Li+ protection circuitry example waveforms. Overvoltage (OV) If either of the voltages on (VIN2 - VIN1) or (VIN1 - VSS) exceeds the overvoltage threshold, VOV, for a period longer than overvoltage delay, tOVD, the CC pin is dri- ven low to shut off the external charge FET and the OV flag in the Protection register is set. The DC output remains high during overvoltage to allow discharging. When (VIN2 - VIN1) and (VIN1 - VSS) falls below the charge-enable threshold, VCE, the DS2775–DS2778 turn the charge FET on by driving CC high. The DS2775–DS2778 drive CC high before [(VIN2 - VIN1) and (VIN1 - VSS)] < VCE if a discharge condition per- sists with VSNS ≥ 1.2mV and [(VIN2 - VIN1) and (VIN1 - VSS)] < VOV. ACTIVE PMOD = 0 UVEN = 0 SLEEP PSPIO = 0 PSDQ = 0 RISING EDGE ON DQ CHARGER DETECT PULL DQ LOW CHARGER DETECT ACTIVE PMOD = 0 UVEN = 1 SLEEP PSPIO = 0 PSDQ = 1 VIN1 OR VIN2 < VUV PULL PIO LOW RISING EDGE ON DQ CHARGER DETECT ACTIVE PMOD = 1 UVEN = 0 SLEEP PSPIO = 1 PSDQ = 0 PULL DQ LOW FOR tSLEEP PULL DQ LOW FOR tSLEEP PULL DQ LOW PULL PIO LOW CHARGER DETECT ACTIVE PMOD = 1 UVEN = 1 SLEEP PSPIO = 1 PSDQ = 1 VIN1 OR VIN2 < VUV Figure 1. Sleep-Mode State Diagram for DS2775/DS2776 ACTIVE PMOD = 0 UVEN = 0 SLEEP PSPIO = 0 PSDQ = X RISING EDGE ON SDA OR SCL CHARGER DETECT VIN1 OR VIN2 < VUV CHARGER DETECT ACTIVE PMOD = 0 UVEN = 1 SLEEP PSPIO = 0 PSDQ = X RISING EDGE ON SDA OR SCL PULL PIO LOW CHARGER DETECT PULL SDA AND SCL LOW FOR tSLEEP ACTIVE PMOD = 1 UVEN = 0 SLEEP PSPIO = 1 PSDQ = X RISING EDGE ON SDA OR SCL PULL SDA AND SCL LOW FOR tSLEEP PULL PIO LOW CHARGER DETECT VIN1 OR VIN2 < VUV ACTIVE PMOD = 1 UVEN = 1 SLEEP PSPIO = 1 PSDQ = X RISING EDGE ON SDA OR SCL Figure 2. Sleep-Mode State Diagram for DS2777/DS2778 |
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Similar Description - DS2778 |
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