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Details, datasheet, quote on part number:TPS3806J20DBVT
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Datasheet text preview:
TPS3806J20, TPS3806I33 DUAL VOLTAGE DETECTOR WITH ADJUSTABLE HYSTERESIS
SLVS393 JULY 2001
D Dual Voltage Detector With Adjustable D D D D D
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 Six-Pin SOT-23 Package
RSTSENSE GND RESET
TPS3806 DBV PACKAGE (TOP VIEW) 1 2 3 6 5 4
HSENSE LSENSE VDD
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.
typical operating circuit
R4 VDD R1 3.6 V Li-lon Cell RESET TPS3806I33 LSENSE R2 HSENSE R3 GND RSTSENSE
R5
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.
PACKAGE INFORMATION THRESHOLD VOLTAGE TA 40_C to 85_C to 85_C DEVICE NAME NAME TPS3806J20DBVR TPS3806I33DBVR TPS3806J20DBVT TPS3806I33DBVT VDD 1.8 V 3V SENSE 1.207 V 1.207 V MARKING PGQI PGPI
The DBVR passive indicates tape and reel containing 3000 parts. The DBVT passive indicates tape and reel containing 250 parts.
ordering information
TPS380 6 I 33 DBV R
Reel Package Nominal Supply Voltage Nominal Threshold Voltage Functionality Family
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright 2001, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
TPS3806J20, TPS3806I33 DUAL VOLTAGE DETECTOR WITH ADJUSTABLE HYSTERESIS
SLVS393 JULY 2001
Function/Truth Tables
TPS3806 VDD > VIT 0 1 RESET L H LSENSE > VIT 0 1 RSTSENSE L H
functional block diagram
TPS3806 LSENSE HSENSE _ + R1 VDD R2 GND Reference Voltage of 1.207 V RSTSENSE
_ +
RESET
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:
w w
V
(LSENSE)
+V
ref
) ) R1 R2 R2 R3 R3 )
here Vref = 1.207 V The high-voltage threshold at HSENSE is calculated as follows: V (HSENSE) +V ref
R1 ) R2 ) R3 R3
here Vref = 1.207 V To minimize battery current draw it is recommended to use 1-M as the total resistor value R(tot) = R1 + R2 + R3.
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
TPS3806J20, TPS3806I33 DUAL VOLTAGE DETECTOR WITH ADJUSTABLE HYSTERESIS
SLVS393 JULY 2001
timing requirements
VDD VIT(HSENSE) VIT(LSENSE) VIT,VDD+Vhys VIT(VDD) 0.8 V RSTSENSE
RESET
= Undefined
Terminal Functions
TERMINAL NAME GND HSENSE LSENSE RESET RSTSENSE VDD NO. 2 6 5 3 1 4 I/O I I I O O I Ground Adjustable hysteresis input Adjustable sense input Active-low open drain reset output (from VDD) Active-low open-drain reset output (from LSENSE) Input supply voltage and fixed sense input DESCRIPTION
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
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