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BQ25619 Arkusz danych(PDF) 24 Page - Texas Instruments |
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BQ25619 Arkusz danych(HTML) 24 Page - Texas Instruments |
24 / 59 page 24 BQ25619 SLUSDF8A – JUNE 2019 – REVISED JULY 2019 www.ti.com Product Folder Links: BQ25619 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Table 4. STAT Pin State CHARGING STATE STAT INDICATOR Charging in progress (including recharge) LOW Charging termination (top off timer may be running) HIGH Sleep mode, charge disable, boost mode HIGH Charge suspend (input over-voltage, TS fault, safety timer fault or system over-voltage) Blinking at 1 Hz 8.3.8.3 Interrupt to Host (INT) In some applications, the host does not always monitor the charger operation. The INT pulse notifies the host on the device operation. The following events will generate a 256-μs INT pulse. • Good input source detected – VBUS above battery (not in sleep) – VBUS below VACOV threshold – VBUS above VPOORSRC (typical 3.8 V) when IBADSRC (typical 30 mA) current is applied (not a poor source) • Input removed • USB/adapter source identified during Input Source Type Detection (IINDPM Threshold). • Charge Complete • Any FAULT event in REG09 • VINDPM / IINDPM event detected (REG0A[1:0], maskable) • Top off timer starts and expires REG09[7:0] and REG0A[6:4] report charger operation faults and status change to the host. When a fault/status change occurs, the charger device sends out an INT pulse and keeps the state in REG09[7:0]/REG0A[6:4] until the host reads the registers. Before the host reads REG09[7:0]/REG0A[6:4] and all the ones are cleared, the charger device would not send any INT upon new fault/status change. To read the current status, the host has to read REG09/REG0A two times consecutively. The first read reports the pre-existing register status and the second read reports the current register status. 8.3.8.4 PMID Voltage Indicator (PMID_GOOD) In BQ25619, the accessory devices can be connected to charger PMID pin to get power either from adapter through Q1 direct path or from battery boost mode. An optional external PMOS FET can be placed between charger PMID pin and accessory input to disconnect the power path during over-current and over-voltage conditions. PMID_GOOD is used to drive external PMOS FET. PMID_GOOD HIGH turns on PMOS FET, and PMID_GOOD LOW turns off PMOS FET. Upon adapter plug-in, PMID_GOOD goes from LOW to HIGH when VBUS rises above battery but below VACOV, and passes poor source detection. During the operation, PMID_GOOD will go from HIGH to LOW if Q1 current exceeds 115% of the IINDPM threshold. (IBLK_OCP), or adapter voltage rises above 5.8 V (VBST_OVP). High voltage adapter over VBST_OVP will keep charging the battery if all conditions are valid. The external PMOS FET will stay off to protect the accessory from over-voltage fault. When adapter is removed, PMID_GOOD goes LOW before battery boost mode starts. In battery boost mode, the device regulates PMID voltage between 4.6 V - 5.15 V as a stable power supply to the accessory devices. PMID_GOOD goes from LOW to HIGH when PMID voltage rises above 3.8 V (VPOORSRC ). Similar to adapter present scenario, PMID valid voltage range is between VPOORSRC and VBST_OVP. Once PMID voltage is out of this range, PMID_GOOD goes LOW to disconnect the accessory device from PMID. During boost mode, all the conditions to exit boost mode will drive PMID_GOOD from HIGH to LOW, including boost mode disable in register, ACOV, TS fault, battery depleted (VBAT_DPL), BATFET over-current, (ISYS_OCP_Q4), etc. |
Podobny numer części - BQ25619_V01 |
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Podobny opis - BQ25619_V01 |
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