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EVK-SH3000USB Datasheet(PDF) 6 Page - Semtech Corporation |
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EVK-SH3000USB Datasheet(HTML) 6 Page - Semtech Corporation |
6 / 22 page SH3002 MicroBuddy™ SYSTEM MANAGEMENT Copyright ©2002-2005 Semtech Corporation 6 V1.20 www.semtech.com Since the clock is only active for the last 1 or 2 ms of the reset interval, when VDD has already been valid for some time, energy savings are realized and the startup of the whole system is made easier. The commonly used reset approach forces the processor to turn the oscillator on and to run at full speed (thus consuming full power) during the critical time when the (possibly depleted) battery is trying to raise VDD to an acceptable level. In contrast, the SH3002 allows the power source to charge the bypass capacitors and raise the level of VDD with little additional load. Only when power has stabilized is the target micro permitted to start expending energy. When a brownout event occurs, the SH3002 continues to provide the clock to the target processor, but at a reduced frequency between 500 kHz and 1.0 MHz. After a delay of 2 ms this clock is stopped, automatically lowering the energy consumption of the whole system, see Figure 2. A Noise Filter (see Figure 1) prevents reset activations from noise and small power glitches on the VDD line. A typical behavior is shown in Figure 3 for the VDD level just above VBO and various amplitudes and durations of the negative-going spikes. When VDD is falling, both reset lines are guaranteed to activate within 5 µs from the time VBO is crossed over. VDD RST N RST CLKOUT Figure 2. Operations of low VDD / Brownout Detector 1V VBO VBO + VHYST 3-5ms 12ms minimum 2 ms 2 ms 1 ms Undefined Normal FOUT Reduced FOUT 0.5-1.0 MHz 6ms 0 5 10 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 Amplitude, V Guaranteed NO reset Guaranteed reset Duration Figure 3. Response to negative voltage spikes |
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