SH3100

2

© 2006 Semtech Corp.

www.semtech.com

POWER MANAGEMENT

Table of Contents

Description .................................................................................................................. .................................................................. 1

Features ...................................................................................................................... .................................................................. 1

Absolute Maximum Ratings ..................................................................................... .................................................................. 4

Current Consumption ................................................................................................ ................................................................ 4,5

Pin Configuration ....................................................................................................... .................................................................. 6

Ordering Information ................................................................................................. .................................................................. 6

Pin Descriptions ......................................................................................................... .............................................................. 6, 7

Block Diagram ...........................................................................................................

.................................................................. 8

Power Supply and Battery Backup .......................................................................... .................................................................. 9

VBAK Protection ........................................................................................................

................................................................. 10

Operating Modes ........................................................................................................ ........................................................... 11, 12

Application Diagrams: Modes 1 to 3 ...................................................................... ................................................................. 13

Application Diagrams: Modes 4 to 6 ...................................................................... ................................................................. 14

Application Diagrams: Modes 7 to 9 ...................................................................... ................................................................. 15

Non-Volatile Fuse Memory Registers ....................................................................... ........................................................... 16, 17

SH3100 Default Settings .......................................................................................... .................................................................. 18

Register Memory Map ............................................................................................... ................................................................. 19

Register Organization ................................................................................................ ................................................................. 19

Register Initialization from Fuses .............................................................................. ................................................................. 19

Multi-Word Registers ................................................................................................. ................................................................. 19

System Management ................................................................................................. .................................................................. 20

Register Descriptions ................................................................................................ ............................................................ 21-47

Applications Information ........................................................................................... ................................................................. 48

Initial Power-Up .......................................................................................................... ................................................................. 48

Standard Operation, VDD settles at greater than programmed VBO ..................... ................................................................. 48

Standard Operation, VDD settles at less than programmed VBO .......................... ................................................................. 49

Automatic Fan Speed Control Enabled ..................................................................... .................................................................. 49

Switching Regulator Modes Enabled ........................................................................ .................................................................. 50

Pad Specifications ..................................................................................................... .................................................................. 51

Standard Digital Input: CLKIN .................................................................................. .................................................................. 51

Tri-State / Analog Input: SNSE ................................................................................. .................................................................. 51

Dual Supply Digital Output: CLK0 & CLK1 ............................................................... .................................................................. 52

Asymmetric Drive Digital Output: NRST .................................................................... .................................................................. 52

Dual Drive Digital Bidirectional: INT .......................................................................... .................................................................. 53

Multi-Function Output: PWM ..................................................................................... .................................................................. 54