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BQ21062 データシート(PDF) 23 Page - Texas Instruments |
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BQ21062 データシート(HTML) 23 Page - Texas Instruments |
23 / 69 page 9.3.8 14-Second Watchdog for HW Reset The BQ21062 integrates a 14-second watchdog timer that makes the BQ21062 perform a HW reset/power cycle if no I2C transaction is detected within 14 seconds of a valid adapter being connected. If the adapter is connected and the host responds with an I2C transaction before the 14-second watchdog window expires, the part continues in normal operation. The 14-second watchdog is disabled by default and may be enabled through I2C by setting the HWRESET_14S_WD bit. Figure 9-7 shows the basic functionality of this feature. R/W VIN SHIPMODE VDD I2C HWRESET_14S_WD PMID 14s 14s R/W 14s R/W HW Reset due to no I2C transaction after VIN detected No HW Reset since function was not re- enabled after boot up No HW Reset since I2C transaction occurred within 14s window of VIN detection Figure 9-7. 14-Second Watchdog for HW Reset Behavior 9.3.9 Faults Conditions and Interrupts ( INT) The device contains an open-drain output that signals an interrupt and is valid only after the device has completed start-up into a valid state. If the part starts into a fault, interrupts will not be sent. The INT pin is normally in high impedance and is pulled low for 128 µs when an interrupt condition occurs. When a fault or status change occurs or any other condition that generates an interrupt such as CHARGE_DONE, a 128-µs pulse (interrupt) is sent on INT to notify the host. All interrupts may be masked through I2C. If the interrupt condition occurs while the interrupt is masked an interrupt pulse will not be sent. If the interrupt is unmasked while the fault condition is still present, an interrupt pulse will not be sent until the INT trigger condition occurs while unmasked. 9.3.9.1 Flags and Fault Condition Response Table 9-3 below details the BQ21062 behavior when a fault condition occurs. Table 9-3. Interrupt Triggers and Fault Condition Response FAULT / FLAG DESCRIPTION INTERRUPT TRIGGER BASED ON STATUS BIT CHANGE CHARGER BEHAVIOR CHARGER SAFETY TIMER PMID BEHAVIOR CHRG_CV_FLAG Set when charger enters Constant Voltage operation Rising Edge Enabled No effect IN powered if VIN is valid CHARGE_DONE_FLA G Set when charger reaches termination Rising Edge Paused- Charging resumes with VIN or CE toggle or when VRCH is reached Reset IN powered if VIN is valid IINLIM_ACTIVE_FLAG Set when Input Current Limit loop is active Rising Edge Enabled. Reduced charge current. Doubled if option is enabled IN powered VIN powered unless supplement mode condition is met. VINDPM_ACTIVE_FL AG Set when VINDPM loop is active Rising Edge Enabled. Reduced charge current. Doubled if option is enabled VIN powered unless supplement mode condition is met. THERMREG_ACTIVE Set when Thermal Charge Current Foldback (Thermal Regulation) loop is active Rising Edge Enabled. Reduced charge current. Doubled if option is enabled VIN powered unless supplement mode condition is met. www.ti.com BQ21062 SLUSE42 – JULY 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 23 Product Folder Links: BQ21062 |
同様の部品番号 - BQ21062 |
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同様の説明 - BQ21062 |
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