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PDF EMC2105 Data sheet ( Hoja de datos )
| Número de pieza | EMC2105 | |
| Descripción | RPM-Based High Side Fan Controller | |
| Fabricantes | SMSC | |
| Logotipo |  |
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EMC2105
RPM-Based High Side Fan
Controller with Hardware
Thermal Shutdown
PRODUCT FEATURES
Datasheet
General Description
The EMC2105 is an SMBus compliant fan controller with
up to five (up to 4 external and 1 internal) temperature
channels. The fan driver can be operated using two
methods each with two modes. The methods include an
RPM based Fan Speed Control Algorithm and a direct
drive setting. The modes include manually programming
the desired settings or using the internal programmable
temperature look-up table to select the desired setting
based on measured temperature.
The temperature monitors offer 1°C accuracy (for
external diodes) with sophisticated features to reduce
errors introduced by series resistance and beta variation
of substrate thermal diode transistors commonly found
in processors.
The EMC2105 also includes a hardware programmable
temperature limit and dedicated system shutdown
output for thermal protection of critical circuitry.
Applications
Notebook Computers
Embedded Applications
Projectors
Industrial and Networking Equipment
Features
Programmable Fan Control circuit
— 600mA, 5V, High Side Fan Driver
— Optional detection of aging fans
RPM based fan control algorithm
— 2% accuracy from 500RPM to 16k RPM
Temperature Look-Up Table
— Allows programmed fan response to temperature
— 1 to 4 thermal zones to control fan driver
— Controls fan speed or drive setting
— Allows externally generated temperature data to control
fan drivers including two DTS channels
Up to Four External Temperature Channels
— Designed to support 45nm, 60nm, and 90nm CPUs
— Automatically detects and supports CPUs requiring the
BJT or Transistor models
— Resistance error correction
— 1°C accurate (60°C to 100°C)
— 0.125°C resolution
— Detects fan aging and variation
Up to three thermistor compatible voltage inputs
Hardware Programmable Thermal Shutdown
Temperature
— Cannot be altered by software
— 60°C to 122°C Range or 92°C to 154°C Range
Programmable High and Low Limits for all channels
3.3V Supply Voltage
SMBus 2.0 Compliant
— SMBus Alert compatible
Available in 20-pin QFN Package - Lead Free RoHS
compliant (4mm x 4mm)
SMSC EMC2105
DATASHEET
Revision 1.78 (04-21-09)
1 page  
RPM-Based High Side Fan Controller with Hardware Thermal Shutdown
Datasheet
B.1.1 LUT Configuration Bit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
B.2 Example #2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
B.2.1 Configuration 3 Bit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
B.2.2 Fan Configuration 1 Bit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
B.2.3 Fan Spin Up Configuration Bit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
B.2.4 LUT Configuration - Bit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
B.3 Example #3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
B.3.1 Fan Configuration 1 Bit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
B.3.2 Fan Spin Up Configuration Bit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
B.3.3 LUT Configuration - Bit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Chapter 8 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
SMSC EMC2105
5
DATASHEET
Revision 1.78 (04-21-09)
5 Page 
RPM-Based High Side Fan Controller with Hardware Thermal Shutdown
Datasheet
PIN NUMBER
EMC2105
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Table 2.1 Pin Description for EMC2105
PIN NAME
DN1 / VIN1
DP1 / VREF_T1
GND
VDD
ALERT#
CLK_IN / GPIO1
SYS_SHDN#
SMDATA
SMCLK
TACH1
FAN_OUT
FAN_OUT
VDD_5V
VDD_5V
TRIP_SET / VIN4
SHDN_SEL
PIN FUNCTION
DN1 - Negative (cathode) analog input for
External Diode 1 (default)
VIN1 - General voltage input for use with
a thermistor
DP1 - Positive (anode) analog input for
External Diode 1 (default)
VREF_T1 - Reference output for use with
a thermistor and to drive VIN3
Ground connection
Power Supply
Active low interrupt - requires external
pull-up resistor.
CLK_IN - 32.768KHz clock input.
GPI1 - General Purpose Input
(default)
GPO1 - General Purpose push/ pull
Output
GPO1 - General Purpose open drain
Output.
Active low Critical System Shutdown
output
SMBus data input/output - requires
external pull-up resistor
SMBus clock input - requires external
pull-up resistor
Tachometer input for Fan 1
High Side Fan Driver Output
High Side Fan Driver Output
Supply for High Side Fan Driver
Supply for High Side Fan Driver
TRIP_SET - Determines HW Shutdown
temperature features for the hardware
shutdown channel
VIN4 - General voltage input when
Thermal / Critical shutdown disabled
Determines HW Shutdown temperature
features and measurement channel
PIN TYPE
AIO (2V)
AI (2V)
AIO (2V)
AO (2V)
Power
Power
OD (5V)
DI (5V)
DI (5V)
DI (5V)
DI (5V)
OD (5V)
DIOD (5V)
DIOD (5V)
DI (5V)
Power
Power
Power
Power
AI (2V)
AI (2V)
AIO
SMSC EMC2105
11
DATASHEET
Revision 1.78 (04-21-09)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EMC2105.PDF ] | |
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