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TPS3806J20DBVR Fiches technique(PDF) 2 Page - Texas Instruments |
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TPS3806J20DBVR Fiches technique(HTML) 2 Page - Texas Instruments |
2 / 9 page TPS3806J20, TPS3806I33 DUAL VOLTAGE DETECTOR WITH ADJUSTABLE HYSTERESIS SLVS393 – JULY 2001 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Function/Truth Tables TPS3806 VDD > VIT RESET LSENSE > VIT RSTSENSE 0 L 0 L 1 H 1 H functional block diagram _ + _ + R1 R2 Reference Voltage of 1.207 V RSTSENSE RESET LSENSE HSENSE VDD GND TPS3806 detailed description operation The TPS3806 is used for monitoring battery voltage and asserting RESET when battery gets discharged below a certain threshold voltage. The battery voltage is monitored by a comparator via an external resistor divider. When the voltage at the LSENSE input drops below the internal reference voltage the RSTSENSE output pulls low. The output remains low until the battery is replaced, or recharged above a second higher trip-point,set at HSENSE. A second voltage can be monitored at VDD. The independent RESET output pulls low when the voltage at VDD drops below the fixed threshold voltage. Because the TPS3806 outputs are open-drain MOSFETs, most applications may require a pullup resistor. programming the threshold voltage levels The low-voltage threshold at LSENSE is calculated as follows: V (LSENSE) + V ref R1 ) R2 ) R3 R2 ) R3 where Vref = 1.207 V The high-voltage threshold at HSENSE is calculated as follows: V (HSENSE) + V ref R1 ) R2 ) R3 R3 where Vref = 1.207 V To minimize battery current draw it is recommended to use 1-M Ω as the total resistor value R(tot) = R1 + R2 + R3. |
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Description similaire - TPS3806J20DBVR |
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