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BQ24072TRGTR Datasheet(PDF) 8 Page - Texas Instruments |
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BQ24072TRGTR Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 34 page  bq24072T bq24075T, bq24079T SLUS937A – DECEMBER 2009 – REVISED APRIL 2010 www.ti.com TERMINAL FUNCTIONS (continued) PIN NUMBER NAME I/O bq24072T bq24075T DESCRIPTION bq24079T IN 13 13 I Input Power Connection. Connect IN to the external DC supply (AC adapter or USB port). The input operating range is 4.35V to 6.6V. The input accepts voltages up to 26V without damage, but operation is suspended. Bypass IN to VS with a 1mF to 10mF ceramic capacitor. TMR 14 14 I Timer Programming Input. TMR controls the pre-charge and fast-charge safety timers. Connect TMR to VSS to disable all safety timers. Connect a 18k Ω to 72kΩ resistor between TMR and VSS to program the timers to a desired length. Leave TMR unconnected to set the timers to the default values. SYSOFF – 15 I System Enable Input. Connect SYSOFF high to turn off the FET connecting the battery to the system output. When an adapter is connected, charge is also disabled. Connect SYSOFF low for normal operation. SYSOFF is internally pulled up to VBAT through a large resistor (~5M Ω). Do not leave SYSOFF unconnected to ensure proper operation. TD 15 – I Termination Disable Input. Connect TD high to disable charger termination. Connect TD to VSS to enable charger termination. TD is checked during startup only and cannot be changed during operation. See the TD section in this datasheet for a description of the behavior when termination is disabled. TD is internally pulled down to VSS with ~285 k Ω. Do not leave TD unconnected to ensure proper operation. ISET 16 16 I/O Fast Charge Current Programming Input. Connect a 590 Ω to 3 kΩ resistor from ISET to VSS to program the fast charge current level. Charging is disabled if ISET is left unconnected. While charging, the voltage ISET reflects the actual charging current and can be used to monitor charge current. See the Charge Current Translator section of this datasheet for more details. Thermal – -- – There is an internal electrical connection between the exposed thermal pad and the VSS Pad pin of the device. The thermal pad must be connected to the same potential as the VSS pin on the printed circuit board. Do not use the thermal pad as the primary ground input for the device. VSS must be connected to ground at all times. Table 1. EN1/EN2 Settings EN2 EN1 MAXIMUM INPUT CURRENT INTO IN 0 0 100 mA. USB100 mode 0 1 500 mA. USB500 mode 1 0 Set by external resistor from ILIM to VSS 1 1 Standby (USB suspend mode) 8 Submit Documentation Feedback Copyright © 2009–2010, Texas Instruments Incorporated Product Folder Link(s): bq24072T bq24075T bq24079T |
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