TS3002ITD822

TS3002 A 1V/1µA Easy-to-Use Silicon Oscillator/Timer FEATURES DESCRIPTION    The TS3002 is the industry’s first and only singlesupply CMOS oscillator fully specified to operate at 1V while consuming a 1µA supply current at an output frequency of 25kHz. This oscillator is compact, easy-to-use, and versatile. Optimized for ultra-long life, battery-powered applications, the TS3002 is the first oscillator in the “NanoWatt Analog™” highperformance analog integrated circuits portfolio. The TS3002 can operate from single-supply voltages from 0.9V to 1.8V.     Ultra Low Supply Current: 1µA at 25kHz Supply Voltage Operation: 0.9V to 1.8V Programmable Frequency Range: o 5.2kHz ≤ FOUT ≤ 90kHz (BOOST = GND) o 5.2kHz ≤ FOUT ≤ 290kHz (BOOST = VDD) FOUT Period Drift: 0.044%/°C PWMOUT Duty Cycle Range: 12% to 90% Single Resistor and Capacitor Set Output Frequency Output Driver Resistance: 160Ω APPLICATIONS Portable and Battery-Powered Equipment Low-Parts-Count Nanopower Oscillator Compact Nanopower Replacement for Crystal and Ceramic Oscillators Nanopower Pulse-width Modulation Control Nanopower Pulse-position Modulation Control Nanopower Clock Generation Nanopower Sequential Timing Requiring only a resistor and a capacitor to set the output frequency, the TS3002 represents a 66% reduction in pcb area and a factor-of-10 reduction in power consumption over other CMOS-based integrated circuit oscillators. When compared against industry-standard 555-timer-based products, the TS3002 offers up to 93% reduction in pcb area and four orders of magnitude lower power consumption. The TS3002 is fully specified over the -40°C to +85°C temperature range and is available in a low-profile, 8pin 2x2mm TDFN package with an exposed backside paddle. TYPICAL APPLICATION CIRCUIT Table 1: FOUT vs RSET, CSET = 7.9pF RSET (MΩ) FOUT (kHz) 1 2.49 4.32 6.81 9.76 106 43 25 16 11 Table 2: FOUT vs CSET, RSET = 4.32MΩ CSET (pF) FOUT (kHz) 5 7.9 10 15 20 39 25 19 13 10 Page 1 © 2014 Silicon Laboratories, Inc. All rights reserved. TS3002 ABSOLUTE MAXIMUM RATINGS VDD to GND.................................................................... -0.3V to +2V VCNTRL to GND ............................................................... -0.3V to +2V RSET to GND................................................................ -0.3V to +2V CSET to GND................................................................ -0.3V to +2V FOUT, PWMOUT to GND ............................................. -0.3V to +2V Short Circuit Duration FOUT, PWMOUT to GND or VDD .................................................................................. Continuous Continuous Power Dissipation (TA = +70°C) 8-Pin TDFN (Derate at 23.8mW/°C above +70°C) ....... 1951mW Operating Temperature Range ................................. -40°C to +85°C Storage Temperature Range .................................. -65°C to +150°C Lead Temperature (Soldering, 10s)...................................... +300°C 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 TS3002ITD822 Tape & Reel ----- Tape & Reel 3000 AAH TS3002ITD822T Lead-free Program: Silicon Labs supplies only lead-free packaging. Consult Silicon Labs for products specified with wider operating temperature ranges. Page 2 TS3002 Rev. 1.0 TS3002 ELECTRICAL CHARACTERISTICS VDD = 1V, VCNTRL = VDD, VBOOST = 0V, RSET = 4.32MΩ, CSET = 7.9pF, RLOAD(FOUT) = Open Circuit, CLOAD(FOUT) = 0pF, CLOAD(PWM) = 0pF unless otherwise noted. Values are at TA = 25°C unless otherwise noted. See Note 1. PARAMETER Supply Voltage SYMBOL VDD CONDITIONS MIN 0.9 TYP 1 1 -40°C ≤ TA ≤ 85°C 2.1 VCNTRL = 0.15 x VDD Supply Current FOUT Period -40°C ≤ TA ≤ 85°C IDD 2.16 VBOOST = VDD -40°C ≤ TA ≤ 85°C VBOOST = VDD, VCNTRL = 0.15 x VDD -40°C ≤ TA ≤ 85°C -40°C ≤ TA ≤ 85°C tFOUT VBOOST = VDD FOUT Period Line Regulation FOUT Period Temperature Coefficient PWMOUT Duty Cycle FOUT, PWMOUT Rise Time FOUT, PWMOUT Fall Time ∆tFOUT/V ∆tFOUT/∆T DC(PWMOUT) CNTRL Output Current PWMOUT Enable PWMOUT Disable BOOST Enable BOOST Disable BOOST Input Current High Level Output Voltage, FOUT and PWMOUT Low-level Output Voltage, FOUT and PWMOUT 1V ≤ VDD ≤ 1.8V -40°C ≤ TA ≤ 85°C 37 34.7 36 33 40.6 39.5 UNITS V µA µs 1.3 VBOOST = VDD VBOOST = VDD VCNTRL = 0.03 x VDD VCNTRL = 0.15 x VDD VCNTRL = 0.27 x VDD VCNTRL = 0.03 x VDD VCNTRL = 0.15 x VDD VCNTRL = 0.27 x VDD %/V -1.6 VBOOST = VDD 4.5 44 83 4.5 47 86 0.044 0.086 8.9 49.3 90.5 8.5 50.4 91.2 %/°C 13 54 97 12.5 54 96 % tRISE See Note 2, CL = 15pF 8.6 ns tFALL See Note 2, CL = 15pF 7.9 ns See Note 3 0.08 % FOUT Jitter RSET Pin Voltage 3.6 MAX 1.8 1.5 2.8 3.7 5.4 3.2 4.8 5.3 7.3 44 45.6 43 48 V(RSET) 0.3 25 ICNTRL V 45 80 nA 131 77 77 10 mV mV mV mV nA -40°C ≤ TA ≤ 85°C VPWM_EN VPWM_DIS VIH VIL IBOOST (VDD - VCNTRL ), 0.9V < VDD < 1.8V (VDD - VCNTRL ), 0.9V < VDD < 1.8V (VDD – VBOOST ), 0.9V < VDD < 1.8V 0.9V < VDD < 1.8V 375 VDD - VOH IOH = 1mA 160 mV VOL IOL = 1mA 140 mV 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: Output rise and fall times are measured between the 10% and 90% of the VDD power-supply voltage levels. The specification is based on lab bench characterization and is not tested in production. Note 3: Timing jitter is the ratio of the peak-to-peak variation of the period to the mean of the period. The specification is based on lab bench characterization and is not tested in production. TS3002 Rev. 1.0 Page 3 TS3002 TYPICAL PERFORMANCE CHARACTERISTICS VDD = 1V, VCNTRL = VDD, VBOOST = 0V, RSET = 4.32MΩ, CSET = 7.9pF, RLOAD(FOUT) = Open Circuit, CLOAD(FOUT) = 5pF, unless otherwise noted. Values are at TA = 25°C unless otherwise noted. Supply Current vs FOUT Period Supply Current vs FOUT Period 2.5 8.5 BOOST = VDD SUPPLY CURRENT - µA SUPPLY CURRENT - µA BOOST = GND 2 1.5 1 0.5 7.1 5.7 4.3 2.9 1.5 0 40 80 120 160 0 200 160 Supply Current vs CLOAD(FOUT) Supply Current vs CLOAD(FOUT) 200 3.2 BOOST = VDD 1.8 SUPPLY CURRENT - µA SUPPLY CURRENT - µA 120 PERIOD - µs BOOST = GND 1.6 1.4 1.2 1 3 2.8 2.6 2.4 2.2 2 0.8 0 10 30 20 40 0 10 30 20 40 CLOAD- pF CLOAD- pF Supply Current vs Temperature Supply Current vs Temperature 1.5 3.2 BOOST = VDD SUPPLY CURRENT - µA BOOST = GND SUPPLY CURRENT - µA 80 PERIOD - µs 2 1.36 1.22 1.08 0.94 0.8 2.88 2.56 2.24 1.92 1.6 -40 -15 10 35 TEMPERATURE - ºC Page 4 40 60 85 -40 -15 10 35 60 85 TEMPERATURE - ºC TS3002 Rev. 1.0 TS3002 TYPICAL PERFORMANCE CHARACTERISTICS VDD = 1V, VCNTRL = VDD, VBOOST = 0V, RSET = 4.32MΩ, CSET = 7.9pF, RLOAD(FOUT) = Open Circuit, CLOAD(FOUT) = 5pF, unless otherwise noted. Values are at TA = 25°C unless otherwise noted. FOUT Period vs Temperature FOUT Period vs Temperature 41.5 43 BOOST = VDD 41 42 40.5 PERIOD - µs PERIOD - µs BOOST = GND 42.5 41.5 41 40.5 40 39.5 39 40 38.5 39.5 38 -40 -15 10 60 35 85 -40 -15 TEMPERATURE - ºC 10 35 60 85 TEMPERATURE - ºC FOUT Period vs Supply Voltage FOUT Period vs Supply Voltage 41.2 40 BOOST = GND BOOST = VDD 39.8 PERIOD - µs PERIOD - µs 41 40.8 39.6 39.4 39.2 40.6 39 40.4 38.8 0.9 1.05 1.35 1.2 1.5 1.65 0.9 1.8 SUPPLY VOLTAGE - Volt 1.05 1.5 1.65 1.8 SUPPLY VOLTAGE - Volt Period vs RSET Period vs RSET 200 200 BOOST = VDD BOOST = GND 160 160 PERIOD - µs PERIOD - µs 1.35 1.2 120 80 120 80 40 40 0 0 0 4 8 12 RSET - MΩ TS3002 Rev. 1.0 16 20 0 4 8 12 16 20 RSET - MΩ Page 5 TS3002 TYPICAL PERFORMANCE CHARACTERISTICS VDD = 1V, VCNTRL = VDD, VBOOST = 0V, RSET = 4.32MΩ, CSET = 7.9pF, RLOAD(FOUT) = Open Circuit, CLOAD(FOUT) = 5pF, unless otherwise noted. Values are at TA = 25°C unless otherwise noted. Period vs CSET Period vs CSET 100 100 BOOST = VDD BOOST = GND 80 PERIOD - µs PERIOD - µs 80 60 40 60 40 20 20 0 4 8 16 12 0 20 4 CSET - pF 12 16 20 CSET - pF Supply Current Distribution Start-up Time vs Supply Voltage 1.8 35% 30% 1.66 PERCENT OF UNITS - % START-UP TIME - ms 8 1.52 1.38 1.24 25% 20% 15% 10% 5% 1.1 0% 0.9 1.2 1.5 SUPPLY VOLTAGE - Volt Page 6 1.8 0.97 0.99 1.01 1.03 SUPPLY CURRENT - µA TS3002 Rev. 1.0 TS3002 FOUT 500mV/DIV FOUT Transient Response VDD = 1.5V, BOOST = VDD, CLOAD = 47pF FOUT 200mV/DIV FOUT Transient Response VDD = 1V, BOOST = VDD, CLOAD = 47pF 5µs/DIV 5µs/DIV PWMOUT 500mV/DIV FOUT 500mV/DIV FOUT and PWMOUT Transient Response VDD = 1V, VCNTRL = 0.035 x VDD, BOOST = VDD, CLOAD = 22pF 5µs/DIV TS3002 Rev. 1.0 Page 7 TS3002 PIN FUNCTIONS Page 8 PIN NAME 1 FOUT 2 BOOST 3 PWMOUT 4 CNTRL 5 CSET 6 GND 7 RSET 8 VDD EP ----- FUNCTION Fixed Frequency Output. A push-pull output stage with an output resistance of 160Ω, the FOUT pin swings from GND to VDD. For lowest power operation, capacitive loads should be minimized and resistive loads should be maximized. BOOST Input. A digital switch input, BOOST controls the propagation delay of the primary timing comparator in the TS3002’s master oscillator subcircuit. Connecting the BOOST pin to GND sets the maximum programmable oscillator frequency to ~90kHz.Connecting the BOOST pin to VDD reduces the comparator’s propagation delay and increases the maximum programmable master oscillator’s frequency to 290kHz. Pulse-width Modulated Output. A push-pull output stage with an output resistance of 160Ω, the PWMOUT pin is wired anti-phase with respect to FOUT and swings from GND to VDD. For lowest power operation, capacitive loads should be minimized and resistive loads should be maximized. PWMOUT Enable and Duty Cycle Control Input. An analog input pin, the VCNTRL pin voltage enables the TS3002’s PWM engine and controls the duty cycle at PWMOUT from 12% (VCNTRL = 0.03 x VDD) to 90% (VCNTRL = 0.27 x VDD). Enabling the PWM engine increases the TS3002’s nominal operating supply current. To disable the TS3002’s PWM engine, CNTRL shall be connected to VDD. FOUT Programming Capacitor Input. A 7.9pF capacitor connected from this pin to GND in junction with a 4.32MΩ resistor at the RSET pin sets the TS3002’s internal oscillator’s output period to ~40µs (25kHz). The maximum capacitance value is 22pF. Ground – Connect this pin to the system’s analog ground plane. FOUT Programming Resistor Input. A 4.32MΩ resistor connected from this pin to GND sets the TS3002’s internal oscillator’s output period to 40μs (25kHz). For optimal performance, the composition of the RSET resistor shall be consistent with tolerances of 1% or lower. The RSET pin voltage is 0.3V at a 1V supply. Power Supply Voltage Input. While the TS3002 is fully specified at 1V, the supply voltage range is 0.9V ≤ VDD ≤ 1.8V. It is always considered good engineering practice to bypass the VDD pin with a 0.1μF ceramic decoupling capacitor in close proximity to the TS3002. Exposed paddle is electrically connected to GND. TS3002 Rev. 1.0 TS3002 BLOCK DIAGRAM THEORY OF OPERATION The TS3002 is a user-programmable oscillator where the period of the square wave at its FOUT terminal is generated by an external resistor and capacitor pair. The output frequency is given by: FOUT (kHz) = 1E6 1 tFOUT (µs) k ∙ RSET MΩ x CSET (pF) Table 1: FOUT vs RSET, CSET = 7.9pF where the scalar k is approximately 1.19. With an RSET = 4.32MΩ and a CSET = 7.9pF, the output frequency is approximately 25kHz with a 50% duty cycle. As design aids, Tables 1 lists TS3002’s typical FOUT for various standard values for RSET with CSET = 7.9pF and Table 2 lists typical FOUT for various standard values for CSET with RSET = 4.32MΩ. The TS3002 also provides a separate PWM output Table 2: FOUT vs CSET, RSET = 4.32MΩ RSET (MΩ) FOUT (kHz) CSET (pF) FOUT (kHz) 1 2.49 4.32 6.81 9.76 106 43 25 16 11 5 7.9 10 15 20 39 25 19 13 10 TS3002 Rev. 1.0 Page 9 TS3002 signal at its PWMOUT terminal that is anti-phase with respect to FOUT. In addition, applying a voltage at the CNTRL both enables the TS3002’s internal PWM engine as well as adjusting the duty cycle from 12% to 90%. A dc control voltage equal to 0.03 x VDD applied to the CNTRL pin enables the PWM engine to set the duty cycle to 12%. A dc control voltage equal to 0.27 x VDD increases the duty cycle to 90% and connecting CNTRL to VDD disables the PWM engine altogether. Configured for nominal operation (PWM engine OFF, BOOST pin to GND), the supply current of the TS3002 is 1µA; enabling the PWM APPLICATIONS INFORMATION Minimizing Power Consumption To keep the TS3002’s power consumption low, resistive loads at the FOUT and PWMOUT terminals increase dc power consumption and therefore should be as large as possible. Capacitive loads at the FOUT and PWMOUT terminals increase the TS3002’s transient power consumption and, as well, should be as small as possible. One challenge to minimizing the TS3002’s transient power consumption is the probe capacitance of oscilloscopes and frequency counter instruments. Most instruments exhibit an input capacitance of 15pF or more. Unless buffered, the increase in transient load current can be as much as 400nA. To minimize capacitive loading, the technique shown in Figure 1 can be used. In this circuit, the principle of series-connected capacitors can be used to reduce the effective capacitive load at the TS3002’s FOUT and PWMOUT terminals. Figure 1: Using an External Capacitor in Series with Probes Reduces Effective Capacitive Load. To determine the optimal value for CEXT once the probe capacitance is known by simply solving for CEXT using the following expression: Page 10 engine increases the TS3002 operating supply current as shown in the electrical specification table. The BOOST pin controls the propagation delay of the TS3002’s internal comparators. When BOOST is connected to GND, the TS3002’s maximum programmable operating frequency is ~90kHz. Connecting the BOOST pin to VDD reduces the propagation delay of the internal oscillators, thereby extending the high end maximum operating frequency to 290kHz. 1 CEXT = 1 CLOAD(EFF) - 1 CPROBE For example, if the instrument’s input probe capacitance is 15pF and the desired effective load capacitance at either or both FOUT and PWMOUT terminals is to be ≤5pF, then the value of CEXT should be ≤7.5pF. TS3002 Start-up Time As the TS3002 is powered up, its FOUT terminal (and PWMOUT terminal, if enabled) is active once the applied VDD is higher than 0.9 volt. Once the applied VDD is higher than 0.9 volt, the master oscillator achieves steady-state operation within 1.2ms. Current- and Voltage-Controlled Oscillators The TS3002 can be configured into a Current-Controlled Oscillator as shown in Figure 2. Figure 2: Configuring the TS3002 into a Current-Controlled Oscillator. With a current source sourcing a current of 223nA to 262nA, FOUT can generate an output signal with a frequency range of 5.2kHz to 90kHz. In a similar manner, a Voltage-Controlled Oscillator can be configured as shown in Figure 3. In this case, a voltage source sourcing a voltage of 290mV to TS3002 Rev. 1.0 TS3002 341mV can generate an FOUT output signal frequency range of 5.2kHz to 90kHz as well. It is recommended to use resistor values with a 1% tolerance. Using Standard Resistors to Increase FOUT Resolution The TS3002 can be configured to provide a 0.1% resolution on the output frequency as shown in Figure 5. To do so, R1 can be set to approximately 10% of the value selected for R2. In addition, R2 and R1 should be chosen with a 0.1% and 1% tolerance, respectively. Since R2 is 90% of the total resistance, it has the largest impact on the resolution of the output frequency. With R1 = 91kΩ and R2 = 910kΩ, the output frequency is 90kHz and with R1 = 400kΩ and R2 = 4MΩ, the output frequency is 23kHz. Figure 3: Configuring the TS3002 into a VoltageControlled Oscillator. Using a Potentiometer to Trim the TS3002’s Output Frequency By using a fixed resistor and a potentiometer, the output frequency of the TS3002 can be trimmed as shown in Figure 4. By selecting a fixed resistor R1 with a tolerance of 0.1% and a potentiometer P1 with a 5% tolerance, the output frequency can be trimmed to provide a ±2% trimming range. As shown in Figure 5, R1+P1 and C2 set the output frequency to 25.052kHz when P1 = 0Ω and with P1 =200kΩ, the resulting output frequency is 24.024kHz. Figure 5: Setting the TS3002’s Output Frequency to 0.1% Resolution using Standard Resistors. Figure 4: Using a Fixed Resistor and a Potentiometer to Trim the TS3002’s Output Frequency. TS3002 Rev. 1.0 Page 11 TS3002 PACKAGE OUTLINE DRAWING 8-Pin TDFN22 Package Outline Drawing (N.B., Drawing not to scale; all dimensions in mm; JEDEC MO-229 compliant) BOTTOM VIEW SIDE VIEW 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. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where personal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized application, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages. Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc. Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders. Silicon Laboratories, Inc. 400 West Cesar Chavez, Austin, TX 78701 +1 (512) 416-8500 ▪ www.silabs.com Page 12 TS3002 Rev. 1.0 Smart. Connected. Energy-Friendly Products Quality Support and Community www.silabs.com/products www.silabs.com/quality community.silabs.com Disclaimer Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products must not be used within any Life Support System without the specific written consent of Silicon Laboratories. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected to result in significant personal injury or death. Silicon Laboratories products are generally not intended for military applications. Silicon Laboratories products shall under no circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons. Trademark Information Silicon Laboratories Inc., Silicon Laboratories, Silicon Labs, SiLabs and the Silicon Labs logo, CMEMS®, EFM, EFM32, EFR, Energy Micro, Energy Micro logo and combinations thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZMac®, EZRadio®, EZRadioPRO®, DSPLL®, ISOmodem ®, Precision32®, ProSLIC®, SiPHY®, USBXpress® and others are trademarks or registered trademarks of Silicon Laboratories Inc. ARM, CORTEX, Cortex-M3 and THUMB are trademarks or registered trademarks of ARM Holdings. Keil is a registered trademark of ARM Limited. All other products or brand names mentioned herein are trademarks of their respective holders. Silicon Laboratories Inc. 400 West Cesar Chavez Austin, TX 78701 USA http://www.silabs.com