TS3002 1V/1µA Easy-to-Use Silicon Oscillator/Timer Demo Board FEATURES DESCRIPTION The demo board for the TS3002 is a completely assembled and tested circuit board that can be used for evaluating the TS3002. The TS3002 is the industry’s first and only single-supply CMOS oscillator fully specified to operate at 1V while consuming a 1µA supply current at an output frequency of 25kHz. The TS3002 is the first oscillator in the “NanoWatt Analog™” high-performance analog integrated circuits portfolio. The TS3002 can operate from a single-supply voltage from 0.9V to 1.8V. FOUT Output frequency: 25kHz o RSET = 4.32MΩ, CSET = 7.9pF PWMOUT Output Duty Cycle Range: o 12% to 90% Programmable Frequency Range: o 5.2kHz ≤ FOUT ≤ 90kHz (BOOST = GND) o 5.2kHz ≤ FOUT ≤ 290kHz (BOOST = VDD) Fully Assembled and Tested 2in x 2in 2-layer circuit board COMPONENT LIST DESIGNATION QTY DESCRIPTION C1 1 C2 1 R1 R2 PWM_ADJ U1 VDD-GND,F_OUT, PWM_OUT IBOOST, J1 1 1 1 1 3 0.1µF ±10% capacitor (0805) 7.9pF ±10% capacitor (0805) 1MΩ ± 1% (0805) 4.32MΩ± 1% (0805) 1MΩ Potentiometer TS3002 Test points 2 Jumpers The TS3002 requires only a resistor and a capacitor to set the output frequency. The demo board is available with an on-board 4.32MΩ RSET resistor and 7.9pF CSET capacitor that sets FOUT, at 25kHz. In addition, a PWMOUT output is made available where a voltage controlled pin is available to modulate the duty cycle of the signal from 12% to 90%. 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. Product data sheet and additional documentation can be found at www.silabs.com. ORDERING INFORMATION Order Number TS3002DB Figure 1. TS3002 Oscillator/Timer Circuit Description TS3002 Demo Board Figure 2. TS3002 Evaluation Board Page 1 © 2014 Silicon Laboratories, Inc. All rights reserved. TS3002 1V/1µA Easy-to-Use Silicon Oscillator/Timer Demo Board DESCRIPTION The demo board includes an on-board 0.1µF decoupling capacitor at the VDD pin. To modulate the duty cycle of the PWMOUT signal, adjust the potentiometer counter-clockwise to increase the duty cycle and vice versa. The PWMOUT is wired antiphase with the FOUT output and can be disabled by removing jumper J1. Furthermore, when the BOOST pin is connected to VDD, the propagation delay of the internal comparators is reduced and in turn, extends the high end of the master oscillator frequency from 90kHz to 290kHz. The default setting for the BOOST pin is GND. An on-board jumper can be used to set the BOOST pin. 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) where the scalar k is approximately 1.19. 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. Furthermore, refer to page 4 and 5 for a series of plots of FOUT frequency and period vs RSET and CSET. Table 1: FOUT vs RSET, CSET = 7.9pF RSET (MΩ) 1 2.49 4.32 6.81 9.76 FOUT (kHz) 106 43 25 16 11 QUICK START PROCEDURE Required Equipment TS3002 Demo Board A DC Power Supply Oscilloscope equivalent Two 10X, 15pF//10MΩ oscilloscope probes Potentiometer screwdriver Model Page 2 or 1) Before connecting the DC power supply to the demo board, turn on the power supply, set the DC voltage to 1V, and then turn it off. 2) Connect the DC power supply positive terminal to the test point labeled VDD. Connect the negative terminal of the DC power supply to the test point labeled GND. 3) To monitor the FOUT output signal, connect the signal terminal of an oscilloscope probe to the test point labeled FOUT and the ground terminal to the test point labeled GND. 4) To monitor the PWMOUT output signal, connect the signal terminal of a second oscilloscope probe to the test point labeled PWMOUT and the ground terminal to the test point labeled GND. 5) To minimize transient power consumption of the probe capacitance of the oscilloscope, a seriesconnected capacitor can be added at either or both FOUT and PWMOUT terminals. To determine what the external series capacitor value should be, use the following expression: CEXT = FOUT (kHz) 39 25 19 13 10 DSO1014A To evaluate the TS3002 silicon oscillator/timer, the following steps are to be performed: Table 2: FOUT vs CSET, RSET = 4.32MΩ CSET (pF) 5 7.9 10 15 20 Agilent 1 1 1 – CLOAD(EFF) CPROBE where CEXT is the external series capacitor, CLOAD(EFF) is the effective load capacitance, and CPROBE is the capacitance of the oscilloscope probe. TS3002-EVB Rev. 1.0 TS3002 1V/1µA Easy-to-Use Silicon Oscillator/Timer Demo Board 6) Select two channels on the oscilloscope and set the vertical voltage scale and the vertical position on each channel to 200mV/DIV and 500mV, respectively. Set the horizontal time scale to 20µs/DIV. The coupling should be DC coupling. Turn on the power supply. The supply current will vary depending on the load on the output, the BOOST pin setting, and whether the PWMOUT is enabled or disabled. Given the default set-up on the board with BOOST set to 0V, the PWMOUT duty cycle is set to ~49.3%. With an output load of 15pF on both FOUT and PWMOUT outputs due to the oscilloscope probes, the supply current should be less than 3µA. Refer to step 5 in order to minimize transient power consumption due to the probe capacitance, which can, in turn, reduce the supply current. Period vs RSET Period vs RSET 200 200 BOOST = GND BOOST = VDD 160 CSET = 7.9pF 120 PERIOD - µs PERIOD - µs 160 80 40 CSET = 7.9pF 120 80 40 0 0 0 4 8 12 16 20 0 4 RSET - MΩ 12 16 20 RSET - MΩ FOUT vs RSET FOUT vs RSET 100 350 BOOST = GND 80 BOOST = VDD 300 CSET = 7.9pF CSET = 7.9pF FREQUENCY - kHz FREQUENCY - kHz 8 60 40 20 250 200 150 100 50 0 0 0 4 8 12 RSET - MΩ TS3002-EVB Rev. 1.0 16 20 0 4 8 12 16 20 RSET - MΩ Page 3 TS3002 1V/1µA Easy-to-Use Silicon Oscillator/Timer Demo Board Period vs CSET Period vs CSET 100 100 80 PERIOD - µs PERIOD - µs BOOST = VDD BOOST = GND RSET = 4.32MΩ 80 60 RSET = 4.32MΩ 60 40 40 20 20 0 4 8 12 16 20 0 4 CSET - pF FOUT vs CSET 16 20 FOUT vs CSET 100 BOOST = GND 30 BOOST = VDD 80 RSET = 4.32MΩ RSET = 4.32MΩ FREQUENCY - kHz FREQUENCY - kHz 12 CSET - pF 40 20 10 0 60 40 20 0 4 8 12 CSET - pF Page 4 8 16 20 0 4 8 12 16 20 CSET - pF TS3002-EVB Rev. 1.0 TS3002 1V/1µA Easy-to-Use Silicon Oscillator/Timer Demo Board Silicon Laboratories, Inc. 400 West Cesar Chavez, Austin, TX 78701 +1 (512) 416-8500 ▪ www.silabs.com Page 5 TS3002-EVB Rev. 1.0 Smart. 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