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from a single cell) and provide a periodic boosted voltage without the need for a separate regulator. Figure 1. Basic Oscillator Design
Note that since VUPTHR and VLWTHR are just a scaling of VBATT, neither TON nor TOFF are dependent on VBATT. The TSM9119’s input bias currents of less than 2 nA (across temperature) enable the use of high-value resistors. timing circuit). Table 1 lists the currents measured for the duty-cycling clock shown. *Note: See “Troubleshooting Analog Circuits,” p.66, by Bob Pease. periodically check system status. action, not simply whenever it is interrupted by the timer. Table 1. Duty Cycling Clock Currents
reasonable transmit power level. Table 2. No-Load Currents
Figure 5. Applying Duty-cycle Control to Boost Power from a Single 1 V Cell TSM9119. Also, the circuit has been simplified and provides lower currents. load cutoff circuitry ensuring that the microcontroller is completely off with zero leakage. currents. If higher currents are needed, the circuit may be modified with the additional circuitry of Figure 3.
Figure 6. “On-Time” Waveforms (for the Circuit in Figure 5) very low duty cycle, providing boost capability without a regulator, and even burst-powering a microcontroller.
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