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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TPS658620ZQZT датащи(PDF) 44 Page - Texas Instruments |
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TPS658620ZQZT датащи(HTML) 44 Page - Texas Instruments |
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44 / 104 page  3.35 STARTING A NEW CHARGE CYCLE 3.36 PRE-CHARGE SAFETY TIMER 3.37 CHARGE SAFETY TIMER TPS658620 Advanced Power Management Unit SLVS993 – OCTOBER 2009 www.ti.com The termination detection is internally deglitched by TDGL(TERM) , 25ms typ. When the charge current drops below the internal termination threshold for t > TDGL(TERM), the bit ITERM is set to 1 in the status register STAT, indicating that termination was detected. ITERM is not affected by the state of TERMOFF control bit, and it will always report the charge current status. If the termination is enabled (TERMOFF cleared to 0) and termination is detected, the charge cycle ends and the charger is turned off. Table 3-12. Termination Detection Conditions CHARGE CURRENT DPM OR DPPM OR TERMINATION TERMINATION BELOW TERMINATION THERMAL LOOP CHARGER MODE DETECTION ENABLED DETECTED, THRESHOLD ACTIVE VIA I2C I(BAT) < ITERM NO X X X NO YES X OFF X NO YES X SUSPEND X NO YES X ON NO NO YES YES ON YES NO YES NO ON YES YES The termination detection is latched and it will be reset only when a new charge cycle starts. The I2C charge status bits in the STAT2 register only indicate DONE state when termination is detected. A new charge cycle will start only if the voltage on the BAT pin falls below the V(RCH) threshold for a time longer than TDGL(RCH), 25ms (typ). A new charge cycle also starts when bit CHGON (CHG1 register) changes from 0 to 1, or if both AC and USB input power are removed and then one or both are re-inserted. After termination is detected a new battery pack insertion detection will not start a new charge cycle, even if V(BAT) < V(RCH). The TPS658620 activates an internal safety timer during the battery pre-conditioning phase. The pre-charge safety timer value is set internally to a fixed value, TPRECHG, 30 min or 60 min typ, selectable via I2C. The pre-charge safety timer is disabled when the termination is disabled via I2C (bit TERMOFF=HI, register CHG1) or when CHTMREN=0 at the I2C register CHG2. When the charger is in suspend mode the pre-charge safety timer is put on hold (i.e., charge safety timer is not reset). Normal operation resumes when the charger exits the suspend mode. If V(BAT) does not reach the internal voltage threshold V(PRECHG) within the pre-charge timer period a fault condition is detected and the charger is turned off. As a safety mechanism the TPS658620 has a user-selectable timer that measures the total fast charge time. This timer (charge safety timer) is started at the end of the pre-conditioning period. The following values are available: 4, 5, 6, 8 hours, selectable via I2C register CHG1 bits CHGTMR. The charge safety timer is kept in reset mode when CHTMREN=0 at the I2C register CHG2. The charge safety timer is disabled when TERMOFF=1, in register CHG1. When the charger is in suspend mode, set via I2C register CHG_CONFIG bit CHGON or set by a pack temperature fault, the charge safety timer is put on hold (i.e., charge safety timer is not reset). Normal operation resumes when the charger exits the suspend mode. If charge termination is not reached within the timer period a fault condition is detected, and the charger is turned off. DETAILED DESCRIPTION 44 Submit Documentation Feedback |
Аналогичный номер детали - TPS658620ZQZT |
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Аналогичное описание - TPS658620ZQZT |
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