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PDF EMC2112 Data sheet ( Hoja de datos )
| Número de pieza | EMC2112 | |
| Descripción | RPM-Based Linear Fan Controller | |
| Fabricantes | SMSC Corporation | |
| Logotipo |  |
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EMC2112
RPM-Based Linear Fan
Controller with Hardware
Thermal Shutdown
PRODUCT FEATURES
Datasheet
General Description
The EMC2112 is an SMBus, closed-loop, RPM-based
fan driver with hardware (HW) thermal shutdown and
reset controller. The EMC2112 offers a single High Side
fan driver capable of sourcing up to 600mA from a 5V
supply.
The EMC2112 utilizes Beta Compensation (an
implementation of the BJT or transistor model for
thermal diodes) and Resistance Error Correction (REC)
to accurately monitor up to three (3) external
temperature zones. These features allow great accuracy
for CPU substrate thermal diodes on multiple process
geometries as well as with discrete diode-connected
transistors. Both Beta Compensation and REC can be
disabled on the EMC2112 to maintain accuracy when
monitoring AMD thermal diodes.
The EMC2112 provides a stand-alone HW thermal
shutdown block. The HW thermal shutdown logic can be
configured for a few common configurations based on
the strapping level of the SHDN_SEL pin on the PCB.
The HW thermal shutdown point can be set in 1°C
increments by using a discrete resistor connected to the
TRIP_SET pin.
The EMC2112 also provides 5V supply ‘power good’
function with a threshold of 4.5V. This function is
provided on the RESET pin.
Applications
Notebook Computers
Desktop Computers
Embedded Applications
Features
Closed-Loop RPM-Based Fan Controller
— 1% accuracy with external clock input
— 3% accuracy with internal clock
— Internal clock can be used as a source
— Aging fan detection
Integrated Linear Fan Driver
— 600mA drive capability
HW Thermal Shutdown (SYS_SHDN)
— 1°C incremental set points for thermal shutdown
— Cannot be disabled by software
Provides Reset Function (RESET) On 5V Supply
Up to Three (3) Remote Thermal Zones
— ±1°C accuracy (60°C to 100°C)
— 0.125°C resolution
— Designed to support 45nm, 65nm, and 90nm CPU
Diodes using BJT and transistor model
— Eliminates temperature offset due to series resistance
from PCB traces and thermal ‘Diode’
Operates From Single 3.0 - 3.6V Supply
— 5V supply for linear fan driver and reset generator
SMBus 2.0 and I2C compatible
— User selectable SMBus address using pull-up resistor
on ADDR_SEL pin
— Supports Block Read and Write functionality
Available in 20-pin, 4x4 QFN Lead-free RoHS
Compliant package
SMSC EMC2112
DATASHEET
Revision 0.88 (11-20-09)
1 page  
RPM-Based Linear Fan Controller with Hardware Thermal Shutdown
Datasheet
List of Figures
Figure 1.1
Figure 2.1
Figure 4.1
Figure 5.1
Figure 5.2
Figure 5.3
Figure 5.4
Figure 5.5
Figure 5.6
Figure 5.7
Figure 8.1
Figure 8.2
Figure 8.3
Figure 8.4
EMC2112 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
EMC2112 Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
EMC2112 System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Spin Up Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Ramp Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
EMC2112 Critical/Thermal Shutdown Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
HW_SHDN Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5V Reset Controller Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Diode Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
EMC2112 Package Drawing - 20-Pin QFN 4mm x 4mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
EMC2112 Package Dimensions and Notes - 20-Pin QFN 4mm x 4mm . . . . . . . . . . . . . . . . 63
EMC2112 PCB Footprint - 20-Pin QFN 4mm x 4mm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
EMC2112 Package Markings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
SMSC EMC2112
5
DATASHEET
Revision 0.88 (11-20-09)
5 Page 
RPM-Based Linear Fan Controller with Hardware Thermal Shutdown
Datasheet
Table 2.2 Pin Types (continued)
PIN TYPE
DO
DIOD
DIO
OD
DIT
DESCRIPTION
Push / Pull Digital Output - this pin is used as a digital
output. It can both source and sink current.
Digital Input / Open Drain Output - this pin is used as a
digital I/O. When it is used as an output, it is open drain
and requires a pull-up resistor. This pin is 5V tolerant.
Digital Input / Output - this pin is used as a digital I/O. It is
push-pull and can sink or source up to 8mA.
Open Drain Digital Output - this pin is used as a digital
output. It is open drain and requires a pull-up resistor. This
pin is 5V tolerant.
Tri-stated Digital Input - this pin is a digital input that
supports 3 logic levels at the input: logic high, logic low, or
high impedance (open).
SMSC EMC2112
11
DATASHEET
Revision 0.88 (11-20-09)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EMC2112.PDF ] | |
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