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BQ2004PNG4 Datasheet(PDF) 7 Page - Texas Instruments |
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BQ2004PNG4 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 22 page  If the voltage at the SNS pin is less than VSNSLO, the MOD output is switched high to pass charge current to the battery. When the SNS voltage is greater than VSNSHI, the MOD output is switched low—shutting off charging current to the battery. VSNSLO = 0.04 ∗ VCC ± 25mV VSNSHI = 0.05 ∗ VCC ± 25mV When used to gate an externally regulated current source, the SNS pin is connected to VSS, and no sense resisitor is required. 7 BD200401.eps Timing Control OSC Display Control Charge Control State Machine Discharge Control MOD Control TCO Check LTF Check A/D EDV Check MCV Check DIS MOD INH VCC VSS BAT SNS TS TCO TM2 TM1 LED1 DCMD DVEN VTS - VSNS VBAT - VSNS LED2 DSEL PWR Control Figure 3. Block Diagram Mode 1 Charge Status LED1 LED2 DSEL = VSS Battery absent Low Low Fast charge pending or discharge-before-charge in progress High High Fast charge in progress Low High Charge complete, top-off, and/or trickle High Low Mode 2 Charge Status LED1 LED2 DSEL = Floating Battery absent, fast charge in progress or complete Low Low Fast charge pending High Low Discharge in progress Low High Top-off in progress High High Mode 3 Charge Status LED1 LED2 DSEL = VCC Battery absent Low Low Fast charge pending or discharge-before-charge in progress Low 1/8s high 1/8s low Fast charge in progress Low High Fast charge complete, top-off, and/or trickle High Low Table 2. bq2004 LED Status Display Options bq2004 |
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