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データシートサーチシステム |
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データシートサーチシステム |
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BQ2054 データシート(PDF) 2 Page - Texas Instruments |
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BQ2054 データシート(HTML) 2 Page - Texas Instruments |
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2 / 16 page  Pin Descriptions TM Time-out programming input This input sets the maximum charge time. The resistor and capacitor values are deter- mined using Equation 5. Figure 7 shows the resistor/capacitor connection. ICTL Inrush current control output ICTL is driven low during the fault or charge-complete states of the chip. It is used to disconnect the capacitor across the battery pack terminals, preventing inrush currents from tripping overcurrent protection fea- tures in the pack when a new battery is in- serted. BAT Battery voltage input BAT is the battery voltage sense input. This potential is generally developed using a high-impedance resistor divider network connected between the positive and the negative terminals of the battery. See Fig- ure 4 and Equation 1. VCOMP Voltage loop compensation input This input uses an external R-C network for voltage loop stability. ITERM Minimum current termination select This three-state input is used to set IMIN for fast charge termination. See Table 2. ICOMP Current loop compensation input This input uses an external R-C network for current loop stability. SNS Charging current sense input Battery current is sensed via the voltage de- veloped on this pin by an external sense re- sistor, RSNS, connected in series with the negative terminal of the battery pack. See Equation 6. TS Temperature sense input This input is used to monitor battery tempera- ture. An external resistor divider network sets the lower and upper temperature thresholds. See Figure 6 and Equations 3 and 4. TPWM Regulation timebase input This input uses an external timing capacitor to ground to set the pulse-width modulation (PWM) frequency. See Equation 7. LCOM Common LED output Common output for LED1–3. This output is in a high-impedance state during initiali- zation to read programming input on DSEL. MOD Current-switching control output MOD is a pulse-width modulated push/pull output that is used to control the charging current to the battery. MOD switches high to enable current flow and low to inhibit cur- rent flow. LED1– LED3 Charger display status 1–3 outputs These charger status output drivers are for the direct drive of the LED display. Display modes are shown in Table 1. These outputs are tri-stated during initialization so that DSEL can be read. DSEL Display select input This three-level input controls the LED1–3 charge display modes. See Table 1. VCC VCC supply 5.0V, ± 10% power VSS Ground 2 bq2054 |
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