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SH3100 Datasheet(PDF) 11 Page - Semtech Corporation |
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SH3100 Datasheet(HTML) 11 Page - Semtech Corporation |
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11 / 80 page  SH3100 POWER MANAGEMENT 11 © 2006 Semtech Corp. www.semtech.com Operating Modes Mode LDO Switching Regulator Fan Control Reset Duration Notes 1 NO NO NO YES Standard operating mode. PWM pin may be used as general- purpose PWM/PDM output. INT defaults to high impedance and may then be programmed by I2C access to define an Interrupt function or GPIO as required. Start-up frequency is determined by configuration fuse setting 2 YES NO NO NO LDO is enabled on PWM pin with default output voltage between 3V and 4.5V as set by fuses. Setting may then be overridden by I2C access 3 NO NO YES NO Automatic fan control is enabled with SNSE input used to detect fan rotation and PWM pin used for fan drive 4 NO YES NO NO Bootstrap boost regulation from an external supply to VDD with internal switching FET and transfer diode on PWM pin. Regulator feedback is determined by the internal VDD divider. The PWM pin is active low during the inductor energize period and floating during the transfer period (to allow current to flow from PWM to VDD through the internal diode). During power up, the PWM pad is clamped to VDD to ensure that the chip can start up with an input battery supply as low as 1.8V. Conversion efficiency is very low due to the relatively high internal switching FET and diode impedances, so this mode is recommended only for powering the SH3100 alone and where energy efficiency is not important 5 NO YES NO NO Bootstrap boost regulation from an external supply to VDD with external switching FET and transfer diode. Regulator feedback is determined by the internal VDD divider. This is suitable for heavier load requirements and is limited by the capabilities of the external components. The PWM pin drives an external NMOS or NPN switching the inductor to GND, and is High during the inductor energize period and Low during the transfer period (to allow current to flow through the external diode) 6 NO YES NO NO Normal boost regulation from VDD to a separate supply with external switching FET and transfer diode. Regulator feedback is input on the SNSE pin. The PWM pin drives an external NMOS or NPN switching the inductor to GND, and is High during the inductor energize period and Low during the transfer period The SH3100 is fuse programmed to a default power-up operating mode from a number of possible options. Once the device has been initialized, it is possible to use the I2C interface to change between any of the following available modes. Note: The Reset Duration column refers to the option to select Low, Medium or fuse set reset durations by the tristate input SNSE pin. If this option is not available then the reset duration defaults to the fuse setting. |
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