RT9802 User Programmable Micro-Power Voltage Detectors General Description Features The RT9802 is a micro-power voltage detector supervising the power supply voltage level for microprocessors (uP) or digital systems. It provides user programmable threshold levels with 0.1V step ranging from 1.5V to 5V, which covers most digital applications. It features low supply current of 3uA. Selection of VTH is z User Programmable Threshold 1.5V to 5V in 0.1V Step with ±3% Accuracy z easily achieved through 3 pins connected to GND, VDD or floating for different threshold voltage settings. Two versions of threshold voltages, 1.5V to 4V and 2.5V to 5V, which are programmed in factory are offered by customer demands. z Low Supply Current 3uA Quick Reset within 20us Built-in Recovery Delay 200ms Low Functional Supply Voltage 0.9V Small SOT-23-6 Package RoHS Compliant and 100% Lead (Pb)-Free The RT9802 performs supervisory function by sending out a reset signal whenever the VDD voltage falls below a preset threshold level. This reset signal will last the whole period before VDD recovering. Reset signal will release after VDD is recovered and lasts for the whole period of Reset Active Time-out period. z z z z Applications z z z z z Computers Controllers Intelligent Instruments Critical μP and μC Power Monitoring Portable/Battery-Powered Equipment Marking Information RT9802 is CMOS, active-low output and provided in SOT-23-6 package. For marking information, contact our sales representative directly or through a Richtek distributor located in your area. Ordering Information Pin Configurations RT9802- (TOP VIEW) Package Type E : SOT-23-6 VSET1 VSET2 VDD 6 Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Reset Threshold A : 2.5V to 5V B : 1.5V to 4V 5 4 2 3 VSET0 GND RESET SOT-23-6 Note : Richtek products are : ` RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. ` Suitable for use in SnPb or Pb-free soldering processes. DS9802-09 April 2011 www.richtek.com 1 RT9802 Typical Application Circuit VSET0 μP VDD GND RESET VSET1 RT9802 GND VSET2 RESET VDD RT9802B VTH = 2.5V in this example Functional Pin Description Pin Name Pin Function VSET0 Threshold Voltage Selection Pin 1 GND Ground Pin RESE Reset Pulse Output, Negative Pulse VDD Power Pin VSET1 Threshold Voltage Selection Pin 2 VSET2 Threshold Voltage Selection Pin 3 Function Block Diagram VDD Internal Clock VSET0 VSET1 P MOS VSET CMP Timer RESET VSET2 N MOS Threshold Voltage Setting GND POR Power On Reset www.richtek.com 2 DS9802-09 April 2011 RT9802 Absolute Maximum Ratings z z z z z z z Terminal Voltage (with Respect to GND) VDD ------------------------------------------------------------------------------------------------------------------------ −0.3V to 6.0V All Other Inputs -------------------------------------------------------------------------------------------------------- −0.3V to VDD+0.3V Input Current, VDD ----------------------------------------------------------------------------------------------------- 20mA Continuous Power Dissipation, PD @ TA = 25°C SOT-23-6 ---------------------------------------------------------------------------------------------------------------- 0.25W Operating Junction Temperature Range -------------------------------------------------------------------------- −40°C to 125°C Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 125°C Package Thermal Resistance SOT-23-6, θJA ----------------------------------------------------------------------------------------------------------- 250°C /W Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C Electrical Characteristics (VDD = 3.0, unless specified) Parameter Symbol Test Conditions Min Typ Max Units 0.9 -- 6 V Operating VDD (VOUT) Range V DD Supply Current IDD V DD = 1.5V to 3.5V, IOUT = 0 V DD = 3.5V to 5V, IOUT = 0 -- Reset Threshold V TH TA = 27°C -- Threshold Voltage Accuracy ΔVTH TA = 27°C -- VCC Drop to Reset Delay tRD Drop = −125mV -- Reset Active Time Out Period tRP V DD ≥ 1.02×VTH, Programmable V IL VSET Pin Input Threshold RESET Output Voltage DS9802-09 April 2011 3 3.3 Note1 uA -- V 3 % -- 20 us -- 200 -- ms TA = 27°C -- 0.2V DD -- V IH TA = 27°C -- 0.85V DD -- V OL V DD < VTH, ISINK = 3.5mA -- 0.4 -- V V www.richtek.com 3 RT9802 Note 1: Pin Conditions for Programmable Threshold Voltage Setting RT9802A RT9802B VSET0 input VSET1 input VSET2 input 5 4 VDD VDD VDD 4.9 3.9 VDD VDD floating 4.8 3.8 VDD VDD GND 4.7 3.7 VDD floating VDD 4.6 3.6 VDD floating floating 4.5 3.5 VDD floating GND 4.4 3.4 VDD GND VDD 4.3 3.3 VDD GND floating 4.2 3.2 VDD GND GND 4.1 3.1 floating VDD VDD 4 3 floating VDD floating 3.9 2.9 floating VDD GND 3.8 2.8 floating floating VDD 3.7 2.7 floating floating floating 3.6 2.6 floating floating GND 3.5 2.5 floating GND VDD 3.4 2.4 floating GND floating 3.3 2.3 floating GND GND 3.2 2.2 GND VDD VDD 3.1 2.1 GND VDD floating 3 2 GND VDD GND 2.9 1.9 GND floating VDD 2.8 1.8 GND floating floating 2.7 1.7 GND floating GND 2.6 1.6 GND GND VDD 2.5 1.5 GND GND floating VDD: bond to VDD; 0: bond to GND; f: no bonding www.richtek.com 4 DS9802-09 April 2011 RT9802 Outline Dimension H D L C B b A A1 e Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.889 1.295 0.031 0.051 A1 0.000 0.152 0.000 0.006 B 1.397 1.803 0.055 0.071 b 0.250 0.560 0.010 0.022 C 2.591 2.997 0.102 0.118 D 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 H 0.080 0.254 0.003 0.010 L 0.300 0.610 0.012 0.024 SOT-23-6 Surface Mount Package Richtek Technology Corporation Richtek Technology Corporation Headquarter Taipei Office (Marketing) 5F, No. 20, Taiyuen Street, Chupei City 5F, No. 95, Minchiuan Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)86672399 Fax: (8862)86672377 Email: [email protected] Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek. DS9802-09 April 2011 www.richtek.com 5