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PDF EMC2101 Data sheet ( Hoja de datos )
| Número de pieza | EMC2101 | |
| Descripción | SMBus Fan Control | |
| Fabricantes | SMSC Corporation | |
| Logotipo |  |
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EMC2101
SMBus Fan Control
with 1°C Accurate
Temperature Monitoring
PRODUCT FEATURES
Datasheet
General Description
The EMC2101 is an SMBus 2.0 compliant, integrated
fan control solution complete with two temperature
monitors, one external and one internal. Each
temperature channel has programmable high limits that
can assert an interrupt.
The fan drive is selectable as a Pulse Width Modulator
(PWM) or Linear (DAC) output. The fan control output,
whether the PWM or DAC drive circuit, uses an eight
position look-up table to allow the user to program the
fan speed profile based on temperature. The DAC out-
put ranges from 0V to VDD with up to 6 bit resolution
while the PWM output has a range of 0% to 100% with
up to 64 steps.
The EMC2101 has an option to automatically upload the
contents of an attached SMBus compatible EEPROM for
auto-programming upon power up.
Advanced thermal sensing enables reduced validation
and characterization time as well as accurately operat-
ing with smaller-geometry processors. Resistance Error
Correction (REC) automatically corrects the offset errors
of board trace and device resistance, up to 100Ω. Auto-
matic Beta Compensation allows the user the flexibility
to design applications that include processor substrate
transistors.
Features
Automatic Beta Compensation
Resistance Error Correction
Self-programming with available SMBus compatible
EEPROM
Selectable PWM or DAC fan driver output
Temperature Monitors
— External channel ±1°C accuracy
— Internal channel ±2°C accuracy
3.3 Volt Operation (5 Volt Tolerant Input Buffers)
SMBus 2.0 Compliant Interface, supports TIMEOUT
8-Pin MSOP Lead-free RoHS Compliant Packages
8-Pin SOIC Lead-free RoHS Compliant Package
Applications
Graphics Processors
Embedded Application Fan Drive
PWM Controller + Temp Sensor
Block Diagram
VDD
EMC2101
Switching
Current
DP
Analog
Mux
ΔΣ ADC
DN
Internal
Temp Diode
External
Temperature
Register
Internal
Temperature
Register
FAN
PWM Driver
DAC Driver
Fan Control
Logic
SMSC EMC2101
GND
Status Registers
DATASHEET
Address Pointer Register
Conversion Rate Register
Internal High Limit Register
External High Limit Register
External TCRIT Limit Register
Fan Control
Look-Up Table
Configuration Register
Interupt Masking
SMCLK
SMDATA
ALERT / TACH
Revision 2.54 (06-16-09)
1 page  
SMBus Fan Control with 1°C Accurate Temperature Monitoring
Datasheet
List of Figures
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 5.8
Figure 9.1
Figure 9.2
EMC2101 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
System Diagram for EMC2101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
System Diagram for EMC2101-R. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Block Diagram of Temperature Monitoring Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
External Diode configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Temperature Filter Step Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Temperature Filter Impulse Response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Fan Control Look-Up Table Example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Example Fault Queue Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8-PIN MSOP / TSSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
8-PIN SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
SMSC EMC2101
5
DATASHEET
Revision 2.54 (06-16-09)
5 Page 
SMBus Fan Control with 1°C Accurate Temperature Monitoring
Datasheet
Table 3.2 Electrical Specifications (continued)
VDD = 3.0V to 3.6V, TA = 0oC - 85oC, Typical values are at TA = 27°C unless otherwise noted
CHARACTERISTIC SYMBOL MIN TYP MAX
UNIT CONDITIONS
Supply Current
Supply Current
Supply Current
Supply Current
Standby Current
IDD
IDD
IDD
IDD
ISTANDBY
Temperature Accuracy
Temperature
Resolution
Conversion Time
Internal Channel
tCONV
Temperature Accuracy
Temperature
Resolution
Conversion Time
External Channel
Diode Decoupling
Capacitor
Diode Decoupling
Capacitor
Resistance Error
Correction
tCONV
CFILTER
CFILTER
RSERIES
TACH Accuracy
Fan Counter Clock
Frequency
PWM Resolution
PWM Frequency
fPWM
0.6 1 mA
200 uA
300 uA
300 400 uA
270 μA
Internal Temperature Monitor
±1 ±2 °C
±1 °C
16 conversion / second - PWM or
DAC driver operational
1 conversion / 16 seconds - PWM
driver operational
1 conversion / 16 seconds - DAC
Driver, no load
Temp monitoring Disabled, DAC
Driver enabled, no load
PWM disabled, Monitoring
disabled
8 bit resolution
3 ms
External Temperature Monitor
±0.5 ±1 °C
±1 ±3 °C
0.125
°C
60°C
10°C
<
<
TTADIO<D7E0<°C100°C,
0°C < TDIODE < 125°C
11 bit resolution
21 ms
2.2 nF
470 pF
100 Ω
TACH Measurement
10 %
90 kHz
Connected across External Diode
(2N3904)
Connected across Substrate
Transistor (CPU diode)
Series resistance in DP and DN
lines
TACH valid
Pulse Width Modulator Fan Driver
64 steps
22 5k Hz
For 64 steps, higher frequencies
are possible with reduced
resolution (see Appendix A
"Advanced PWM Options").
SMSC EMC2101
11
DATASHEET
Revision 2.54 (06-16-09)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EMC2101.PDF ] | |
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