TPS3806I33

www.ti.com TPS3806J20 TPS3806I33 SLVS393A – JULY 2001 – REVISED NOVEMBER 2004 Dual Voltage Detector with Adjustable Hysteresis FEATURES Dual Voltage Detector With Adjustable Hysteresis 3.3-V/Adjustable and 2-V/Adjustable Assured Reset at VDD = 0.8 V Supply Current: 3 µA Typical at VDD = 3.3 V Independent Open-Drain Reset Outputs Temperature Range: -40°C to +85°C 6-Pin SOT-23 Package DESCRIPTION The TPS3806 integrates two independent voltage detectors for battery voltage monitoring. During power-on, RESET and RSTSENSE are asserted when supply voltage VDD or the voltage at LSENSE input become higher than 0.8 V. Thereafter, the supervisory circuit monitors VDD and LSENSE, keeping RESET and RSTSENSE active as long as VDD and LSENSE remain below the threshold voltage, VIT. As soon as VDD or LSENSE rise above the threshold voltage VIT, RESET or RSTSENSE is deasserted, respectively. The TPS3806 device has a fixed-sense threshold voltage VIT set by an internal voltage divider at VDD and an adjustable second-LSENSE input. In addition, an upper voltage threshold can be set at HSENSE to allow a wide adjustable hysteresis window. The devices are available in a 6-pin SOT-23 package. The TPS3806 device is characterized for operation over a temperature range of -40°C to +85°C. TPS3806 DBV PACKAGE (TOP VIEW) RSTSENSE 1 6 HSENSE GND 2 5 LSENSE RESET 3 4 VDD 3.6 V Li-lon Cell VDD RESET R1 TPS3806I33 LSENSE RSTSENSE R2 HSENSE GND R3 R4 R5 Typical Operating Circuit ...