SH3100 datasheet(13/80 Pages) SEMTECH

Part #	SH3100

Description	Supervisory IC with I2C Interface and PWM

PDF	80 Pages

Scroll/Zoom	100%

Manufacturer	SEMTECH [Semtech Corporation]

Direct Link	http://www.semtech.com

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13 / 80 page

SH3100

POWER MANAGEMENT

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

DeviceMode = 000

Mode 2 – LDO enabled

As standard operation but with PWM output pin

programmed as LDO output. (Linearly regulated

down from VDD).

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

DeviceMode = 101

ComparatorSource = 11 (SNSE)

CLK1HF/LF = 0

ForcedDACValue = xx (to override 70 mV

SNSE threshold if required)

Application Diagrams - Modes 1 to 3

SH3100 Datasheet(PDF) 13 Page - Semtech Corporation