SH3100IMTR SEMTECH [Semtech Corporation], SH3100IMTR Datasheet - Page 3

• Manufacturer Part Number: SH3100IMTR
• Description: Supervisory IC with I2C Interface and PWM
• Manufacturer: SEMTECH [Semtech Corporation]

© 2006 Semtech Corp.
Functional Descriptions ............................................................................................. .................................................................. 55
POWER MANAGEMENT
Table of Contents (
32.768 kHz Crystal Oscillator ................................................................................... .................................................................. 55
Plot of Crystal Padding Capacitance versus Adjustment Code .............................. .................................................................. 56
Internal 32.768 kHz Oscillator .................................................................................. .................................................................. 56
System Reset – Programmable VDD Threshold (VBO) ............................................ .................................................................. 57
Programmable Reset Duration ................................................................................. .................................................................. 58
System Reset - Watchdog Timer (WDT) .................................................................... .................................................................. 59
System Reset - Manual Override ............................................................................... .................................................................. 59
Real Time Clock (RTC) ............................................................................................... .................................................................. 60
Periodic Interval Timer (PIT) ...................................................................................... .................................................................. 61
Interrupt Operation .................................................................................................... .................................................................. 62
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General Purpose 8-Bit DAC & Comparator ............................................................... .................................................................. 64
Temperature Measurement ...................................................................................... .................................................................. 65
PWM Operation & Fan Speed Control ...................................................................... .................................................................. 66
Auto-PWM Mode (Fan Control Mode) ....................................................................... .................................................................. 66
Auto-PWM Engine Features: ...................................................................................... ........................................................... 66, 67
Erratum ....................................................................................................................... .................................................................. 67
Manual PWM Control ................................................................................................. .................................................................. 67
PWM Mode ................................................................................................................. .................................................................. 68
Switching Regulator Operation ................................................................................. .................................................................. 69
Low Dropout Linear Regulator (LDO) ........................................................................ .................................................................. 70
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Combined Write Format ............................................................................................ .................................................................. 71
Normal Write Format ................................................................................................. .................................................................. 71
Combined Read Format ............................................................................................ .................................................................. 72
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High-Frequency Digitally-Controlled Oscillator (HFDCO) .......................................... ................................................................. 74
Spectrum Spreading .................................................................................................. .................................................................. 75
Clock Management & Frequency Locked Loop (FLL) .............................................. .................................................................. 76
CLK0 & CLK1 Outputs ............................................................................................... .................................................................. 77
HFDCO Clock On/Off Control ..................................................................................... .................................................................. 78
Outline Drawing and Land Pattern ............................................................................ .................................................................. 79
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C Short-Form Interrupt Clear .................................................................................. .................................................................. 63
C Interface ............................................................................................................... .................................................................. 71
C Timing Diagrams .................................................................................................. .................................................................. 73
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