TS12001ITD1022T

TS12001 A 0.65V/1µA Nanopower Voltage Detector with Dual Outputs FEATURES DESCRIPTION         Nanopower Voltage Detector in Single 4 mm2 Package Ultra Low Total Supply Current: 1µA (max) Supply Voltage Operation: 0.65V to 2.5V Preset 0.78V UVLO Trip Threshold Internal ±10mV Hysteresis Resettable Latched Comparator Complimentary and Open-drain Comparator Outputs Separate Comparator Output Supply Pin APPLICATIONS Power-Fail Indicator Low-Battery Detection Battery-Backup Detection CPU, Microprocessor, and Logic Reset Controller Battery-powered Systems The TS12001 voltage detector combines a 0.58V reference and a comparator with resettable comparator latch in a single package. The TS12001 operates from a single 0.65V to 2.5V power supply and consumes less than 1µA total supply current. Optimized for ultra-long life operation, the TS12001 expands the growing “NanoWatt Analog™” highperformance analog integrated circuits portfolio. The voltage detector exhibits a preset UVLO threshold voltage of 0.78V (typ) or can be set to other threshold voltages with two external resistors. The comparator exhibits ±10mV of internal hysteresis for clean, chatter-free output switching. The TS12001 also offers both push-pull and open-drain outputs. When compared against similar products, the TS12001 offers a factor-of-2 lower power consumption and at least a 33% reduction in pcb area. The TS12001 is fully specified over the -40°C to +85°C temperature range and is available in a lowprofile, 10-pin 2x2mm TDFN package with an exposed back-side paddle. TYPICAL APPLICATION CIRCUIT A Nanopower 1.8V Core System Voltage Detector Page 1 © 2014 Silicon Laboratories, Inc. All rights reserved. TS12001 ABSOLUTE MAXIMUM RATINGS Output Current COUTPP, COUTOD………...…………................................20mA Short-Circuit Duration (REFOUT, COUTPP, COUTOD)………...………...….Continuous Continuous Power Dissipation (TA = +70°C) 10-Pin TDFN (Derate at 13.48mW/°C above +70°C) ......... 1078mW Operating Temperature Range ................................. -40°C to +85°C Junction Temperature……………………………………..……+150°C Storage Temperature Range .................................. -65°C to +150°C Lead Temperature (Soldering, 10s)...................................... +300°C Supply Voltage (VIN to VSS) ...................................................+2.75V Supply Voltage (OVDD to VSS) ................................................+2.75V Input Voltage SET………………...…………………...….VSS – 0.3V to VIN + 0.3V LHDET………………………………….…........VSS - 0.3V to +5.5V Output Voltage REFOUT……….…………………...…... VSS – 0.3V to VIN + 0.3V COUTPP……………..……….........… VSS - 0.3V to OVDD + 0.3V COUTOD……………………..…..………..… VSS - 0.3V to +5.5V Electrical and thermal stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is not implied. Exposure to any absolute maximum rating conditions for extended periods may affect device reliability and lifetime. PACKAGE/ORDERING INFORMATION ORDER NUMBER PART CARRIER QUANTITY MARKING TS12001ITD1022 Tape & Reel ----- Tape & Reel 3000 AAN TS12001ITD1022T Lead-free Program: Silicon Labs supplies only lead-free packaging. Consult Silicon Labs for products specified with wider operating temperature ranges. Page 2 TS12001 Rev. 1.0 TS12001 ELECTRICAL CHARACTERISTICS VIN = OVDD = 0.8V; VSS = 0V; VSET = VSS; VCOUTPP = HiZ; VCOUTOD = HiZ; TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. See note 1. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage VIN 0.65 2.5 V 0.8 TA = +25°C µA Supply Current IIN REFOUT = open -40°C ≤ TA ≤ 85°C 1 UVLO Output Driver Supply OVDD 0.65 2.5 V Voltage Output Driver 0.1 µA IODD Supply Current falling until COUTPP switches LOW 725 761 797 V Preset UVLO IN mV Trip Point VIN rising until COUTPP switches HIGH 743 781 818 540 567 595 TA = +25°C VSET falling until COUTPP switches LOW -40°C ≤ TA ≤ 85°C 534 604 SET Trip Point 560 587 615 TA = +25°C VSET rising until COUTPP switches HIGH -40°C ≤ TA ≤ 85°C 550 620 13 VSET rising SET Trip µs Response Time VSET falling 10 Preset UVLO ±10 mV Trip Hysteresis SET Enable See Note 2 90 mV Threshold SET Input 20 nA VSET = VSS; VSET = VIN Leakage 0.1 0.78V ≤ VIN ≤ 1.1V Comparator Latched Output LHDET Input V VIL Enabled Low Voltage 1.1V < VIN ≤ 2.5V 0.2 VIN -0.1 0.78V ≤ VIN ≤ 1.1V Comparator Latched Output LHDET Input V VIH Disabled 1.1V < VIN ≤ 2.5V 1 High Voltage LHDET Input 100 nA VLHDET = VSS; VLHDET = 5.5V Leakage 555 577 600 TA = +25°C Reference mV VREF Output Voltage -40°C ≤ TA ≤ 85°C 552 602 Reference 0.5 % Load IOUT = ±100nA Regulation Output High VOH COUTPP; IOUT = -100μA VIN – 0.1 V Voltage Output Low COUTPP; IOUT = 100μA VSS + 0.1 V VOL Voltage Output Low COUTOD; IOUT = 100μA VSS + 0.11 V VOL Voltage 0.1 mA Sourcing; VCOUTPP = VSS Output ShortCircuit ISC Sinking; VCOUTPP = VIN 0.5 mA Current, Sinking; VCOUTOD = VIN 1.4 mA Open Drain COUTOD; VCOUTOD = 5V 20 nA Leakage Note 1: All devices are 100% production tested at TA = +25°C and are guaranteed by characterization for TA = TMIN to TMAX, as specified. Note 2: A SET voltage above this threshold voltage enables the SET pin voltage to control the comparator output. TS12001 Rev. 1.0 Page 3 TS12001 TYPICAL PERFORMANCE CHARACTERISTICS VIN = OVDD = 2.5V; VSS = 0V; VSET = VSS; VCOUTPP = HiZ; VCOUTOD = HiZ, unless otherwise noted. Typical values are at TA = +25°C. Supply Current vs Supply Voltage and Temperature Reference Voltage vs Temperature 0.592 REFERENCE VOLTAGE - V SUPPLY CURRENT - µA 0.8 TA = +85ºC 0.7 TA = +25ºC 0.6 TA = -40ºC 0.5 0.4 0.588 0.586 0.584 0.582 0.65 1.02 1.39 1.76 2.13 -15 -40 2.5 60 SET Threshold Voltage vs Temperature COUTPP Output Voltage High vs Source Current 0.6 85 0.5 Low-to-High VIN - VOH - V 0.59 0.585 0.4 0.3 0.2 High-to-Low 0.58 0.1 0 0.575 -40 -15 10 35 60 85 0 1 TEMPERATURE - ºC 2 3 4 SOURCE CURRENT - mA COUTPP Output Voltage Low vs Sink Current COUTOD Short-Circuit Current vs Supply Voltage 0.4 SHORT-CIRCUIT CURRENT - mA 2.5 0.3 VOL - V 35 TEMPERATURE - ºC 0.595 0.2 0.1 0 VCOUTOD = VIN 2 1.5 1 0.5 0 1 2 SINK CURRENT - mA Page 4 10 SUPPLY VOLTAGE - Volt 0.6 SET THRESHOLD VOLTAGE - V 0.59 3 0.65 1.11 1.58 2.04 2.5 SUPPLY VOLTAGE - V TS12001 Rev. 1.0 TS12001 TYPICAL PERFORMANCE CHARACTERISTICS VIN = OVDD = 2.5V; VSS = 0V; VSET = VSS; VCOUTPP = HiZ; VCOUTOD = HiZ, unless otherwise noted. Typical values are at TA = +25°C. COUTPP Short-Circuit Current vs Supply Voltage COUTPP Short-Circuit Current vs Supply Voltage 18 SHORT-CIRCUIT CURRENT - mA SHORT-CIRCUIT CURRENT - mA 16 VCOUTPP = VSS 12 8 4 0 VCOUTPP = VIN 12 6 0 0.65 1.11 1.58 2.04 0.65 2.5 1.58 2.04 2.5 SUPPLY VOLTAGE - V SUPPLY VOLTAGE - V COUTPP Transient Response with LHDET VIN = OVDD = 2.5V, CLOAD = 15pF OUTPUT 1V/DIV VIN 1V/DIV COUTPP LHDET SET 2V/DIV 2V/DIV 500mV/DIV COUTPP Power-Up Transient Response VSET = 2.5V, CLOAD = 15pF 100ms/DIV TS12001 Rev. 1.0 1.11 500µs/DIV Page 5 TS12001 PIN FUNCTIONS Page 6 PIN NAME 1 VIN 2 SET 3 4 NC VSS 5 LHDET 6 7 8 9 REFOUT NC COUTOD COUTPP 10 OVDD EP ---- FUNCTION Positive Supply Voltage. Connect a 0.1µF bypass capacitor from this pin to analog VSS/GND. External UVLO Trip Threshold Set Pin. When this pin is set to VSS, the internal preset 0.78V UVLO trip threshold controls the comparator output. When the applied voltage to this pin is higher than 90mV, the SET pin sets the trip threshold and controls the comparator output. If the SET pin is not used, connect the pin to to VSS. No Connection Negative Supply Voltage. Latch Enable Pin. When LHDET is set HIGH, the outputs of the comparator will toggle normally based on the inputs to the comparator. When LHDET is set LOW and COUTPP is HIGH, COUTPP will remain HIGH despite any changes to the input of the comparator. COUTPP will once again respond to changes to the input when LHDET is toggled HIGH. If COUTPP is initially LOW and the LHDET is then LOW, COUTPP will stay LOW. If a LOW-to-HIGH transition occurs on COUTPP, COUTPP will switch to HIGH and stay HIGH and not respond to any changes at the input. The LHDET pin must always be set to a known state. For unlatched comparator operation, set LHDET to HIGH. The open-drain output (COUTOD) is the inverted version of the COUTPP output. 0.58V Reference Output No Connection Comparator Open-Drain Output Comparator Push-Pull Output Output Driver Positive Supply Voltage. Connect a 0.1µF bypass capacitor from this pin to analog VSS/GND. Exposed paddle is electrically connected to VSS/GND. TS12001 Rev. 1.0 TS12001 BLOCK DIAGRAM THEORY OF OPERATION The TS12001 combines a 0.58V ±4.5% reference and an analog comparator with a resettable comparator latch in a single package. The TS12001 operates from a single 0.65V to 2.5V power supply and consumes less than 1µA total supply current. The TS12001 comparator has a push-pull and opendrain output driver. The push-pull output driver is powered from a separate supply voltage, OVDD. The open-drain output stage allows for easy output voltage level translation as may be required when driving systems powered with a different power supply rail. The analog comparator exhibits ±10mV of internal hysteresis for clean, chatter-free output switching. The internal reference was designed to sink or source up to 0.1µA load currents. The TS12001 has a preset UVLO threshold voltage of 0.78V (typ) or can be set to other threshold voltages with two external resistors where the divided TS12001 Rev. 1.0 voltage is applied to the SET pin. When the SET pin voltage is grounded or it is less than approximately 90mV, the internal preset UVLO threshold circuit will control the comparator outputs. If the SET pin is above approximately 90mV, the external voltage divider circuit will control the comparator outputs. The 0.58V reference voltage is tied to the inverting input of the comparator and the output of a switch is connected to the non-inverting input of the comparator. The output of the switch is either the SET voltage or the internal UVLO threshold voltage, depending on whether the SET pin voltage is above or below approximately 90mV. If the switch output is above 0.58V, the push-pull output (COUTPP) will be HIGH and the open-drain output (COUTOD) will be LOW and vice versa. For proper operation, the supply voltage VIN must be applied before the output driver supply voltage (OVDD) is applied. The TS12001 has a latch enable pin (LHDET) that Page 7 TS12001 allows the output of the comparator to latch to a HIGH state under certain conditions. If LHDET is set HIGH, the COUTPP output will switch based on the input to the comparator. When LHDET is set LOW and COUTPP is HIGH, COUTPP will remain HIGH until LHDET goes HIGH. If COUTPP is initially LOW instead, COUTPP will remain LOW until a LOW-toHIGH transition occurs on the COUTPP output. After this event, COUTPP will remain HIGH and be unresponsive to any changes at the input of the comparator until LHDET goes HIGH. In essence, the LHDET pin offers a LOW-to-HIGH detection. However, LHDET must not be left open. The opendrain output, COUTOD, is the inverter version of the COUTPP output. Connect LHDET to VIN for normal operation or to VSS for LHDET enable. If the SET pin is not used, it cannot be left unconnected and should be tied to VSS. Comparator The TS12001 has an internal comparator that can eliminate supply glitches that commonly occur when APPLICATIONS INFORMATION External Voltage Detector Design Depending on the battery voltage used and the voltage one wishes to detect, the TS12001 can be designed accordingly. As shown in Figure 1, R1 and R2 can be selected based on the desired voltage to detect. Table 1. provides R1 and R2 resistor combinations for detecting various VIN voltages. VIN Threshold R1(MΩ) R2(MΩ) Voltage(V) 0.9 2.2 4.02 1.07 3.32 4.02 1.28 4.75 4.02 1.52 6.49 4.02 1.85 8.66 4.02 Table 1. Resistor Combinations for Several VIN Threshold Voltages The design equation for this circuit is shown below. The SET pin voltage (VSET) that will cause a HIGH-to-LOW transition on the output is approximately 580mV. To design the circuit, R1 Page 8 output transitions occur. In addition, the input exhibits ±10mV of internal hysteresis in order to insure clean output switching behavior. The outputs can swing to within 100mV of the supply rails. The COUTPP output can source and sink 0.1mA and 0.5mA of current. The COUTD outputs can sink 1.4mA of current with VCOUTOD = 0.78V Internal Reference The TS12001’s on-board 0.58V ±4.5% reference voltage can source and sink 0.1µA and 0.1µA of current and can drive a capacitive load less than 50pF and greater than 50nF with a maximum capacitive load of 250nF. The higher the capacitive load, the lower the noise on the reference voltage and the longer the time needed for the reference voltage to respond and become available on the REFOUT pin. With a 250nF capacitive load, the response time is approximately 20ms. While also available as a separate pin as REFOUT, the reference is tied internally to the inverting input of the comparator. or R2 can be selected along with the desired battery voltage to detect. Then, the second resistor value can be evaluated using the voltage divider equation below. R1= VIN x R2 ‐VSET x R2 VSET A Nanopower 1.8V Core System Voltage Detector When power supply rails sag in any system, it is important to alert the CPU. A CPU can be used to detect when I/O or core system voltages sag below a prescribed threshold as shown Figure 2. In this circuit, a 1.8V core system voltage detector is designed around the TS12001 providing a low battery detect signal. R1 and R2 were selected to set a SET voltage at 582mV so that when VCORE drops below 1.77V, the TS12001 output transitions to LOW. It is recommended to use 1% resistors for optimal accuracy. The circuit consumes approximately 0.75µA of current when VCORE = 1.8V. PC Board Layout and Power-Supply Bypassing While power-supply bypass capacitors are not typically required, it is good engineering practice to use 0.1uF bypass capacitors close to the device’s TS12001 Rev. 1.0 TS12001 power supply pins. When the power supply impedance is high, the power supply leads are long, or there is excessive noise on the power supply traces. To reduce stray capacitance, it is also good engineering practice to make signal trace lengths as short as possible. Also recommended are a ground plane and surface mount resistors and capacitors. Input Noise Radiated noise is common in low power circuits that require high impedance circuits. To minimize this effect, all traces between any of the inputs and passive component networks should be made as short as possible. Figure 1. External Voltage Detector Design Circuit Figure 2. A Nanopower 1.8V Core System Voltage Detector Circuit TS12001 Rev. 1.0 Page 9 TS12001 PACKAGE OUTLINE DRAWING 10-Pin TDFN22 Package Outline Drawing (N.B., Drawings are not to scale) Patent Notice Silicon Labs invests in research and development to help our customers differentiate in the market with innovative low-power, small size, analog-intensive mixed-signal solutions. Silicon Labs' extensive patent portfolio is a testament to our unique approach and world-class engineering team. The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features or parameters. 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