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SH3100 Scheda tecnica(PDF) 13 Page - Semtech Corporation |
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SH3100 Scheda tecnica(HTML) 13 Page - Semtech Corporation |
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13 / 80 page  SH3100 POWER MANAGEMENT 13 © 2006 Semtech Corp. www.semtech.com . Mode 1 – Standard operation No LDO, fan control or switching regulation. General purpose PWM/PDM output is available Use with or without external 32.768 kHz crystal Register settings DeviceMode = 000 Mode 2 – LDO enabled As standard operation but with PWM output pin programmed as LDO output. (Linearly regulated down from VDD). Register settings DeviceMode = 100 ForcedDACValue = xx (to set LDO voltage) Mode 3 – Auto fan speed control Fan speed is automatically controlled by measuring temperature at regular intervals and adjusting PWM duty cycle according to configurable control parameters. SNSE pin is monitored to detect possible fan stall Register settings DeviceMode = 101 ComparatorSource = 11 (SNSE) CLK1HF/LF = 0 ForcedDACValue = xx (to override 70 mV SNSE threshold if required) Application Diagrams - Modes 1 to 3 |
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