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EMCT03-ACZL Schematic ( PDF Datasheet ) - ETC

Teilenummer EMCT03-ACZL
Beschreibung 1C TRIPLE SMBUS TEMPERATURE SENSOR
Hersteller ETC
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Gesamt 16 Seiten
EMCT03-ACZL Datasheet, Funktion
EMCT03
1°C Triple SMBus
Temperature Sensor
Datasheet
www.DataSheet4U.com
General Description
The EMCT03 is a System Management Bus (SMBus)
temperature sensor that is capable of monitoring three
temperature zones. The three temperature zones
consist of two external and one internal temperature
diode. The internal 11 bit sigma-delta ADC architecture
with digital filtering attributes to superb linearity and
immunity to interference and noise. An extended
temperature format may be selected for compatibility
with a broad range of CPUs. Selectable conversion
rates and standby mode support low-power operation.
Features
Low Power; 3.0V to 3.6V Supply
— Programmable conversion rate
— < 1mA at 16 Conversions per Second
— < 3uA in Standby Mode
SMBus 2.0 Compliant interface
Two External Temperature Monitors:
— Range -64°C to +191°C
— 0.125°C resolution
±1°C Accuracy 40°C to 80°C
— Diode Fault Reporting
Internal Temperature Monitor
— Range 0°C to +85°C
— 0.125°C resolution
±3°C Accuracy 0°C to 85°C
Programmable Conversion Rate
MSOP-8 3x3mm Package; Green, Lead-Free
Package also available.
Simplified Block Diagram
DP1
DN1
Switching
Current
DP2
DN2
Local Temp
Diode
EMCT03
11-bit
Sigma Delta
ADC
Remote Temp
Register 1
Remote Temp
Register 2
Local Temp
Register
Configuration
Register
Digital Mux
and
Byte Interlock
Status Register
SMCLK
SMDATA
SMSC EMCT03
DATASHEET
Revision 2.3 (04-19-05)






EMCT03-ACZL Datasheet, Funktion
Chapter 3 Product Description
1°C Triple SMBus Temperature Sensor
Datasheet
3.1
The EMCT03 is an SMBus sensor that is capable of monitoring three temperature zones. The part
may be used as a companion to one of SMSC’s broad line of SIO host circuits, or other devices
capable of performing the SMBus host function.
EMCT03
DP1
DN1
DP2
DN2
Internal
Diode
SMBus
Host
(SMSC SIO)
SMBus
Interface
Figure 3.1 System Overview
In cooperation with the host device, thermal management can be performed as outlined in Figure 3.1
above. Thermal management consists of the host reading the temperature data from the remote and
internal temperature diodes of the EMCT03 and controlling the speed of one or multiple fans. Since
the EMCT03 incorporates one internal and two external temperature diodes, three separate thermal
zones can be monitored and controlled with this application. Also, measured temperature levels can
quickly be compared to preset limits within the host device which in turn will take the appropriate action
when values are found to be out of limit.
The EMCT03 has two basic modes of operation:
Run Mode: In this mode, the EMCT03 continuously converts temperature data and updates its
registers. The conversion rate is configured by the lower bits in the configuration register as
described in Table 3.11, "Configuration Register, Conversion Rate," on page 11.
Standby Mode: In this mode, the EMCT03 is powered down, drawing a maximum current of only
3uA. The SMBus is still operational and a one-shot command can be given which will force the
circuit to complete one full set of temperature conversions. The EMCT03 will return to Standby
Mode after the one shot conversion has finished.
Temperature Monitors
Thermal diode temperature measurements are based on the change in forward bias voltage of a diode
when operated at two different currents:
Vbe _ high
Vbe _ low
=
n
KT
q
ln
I high
I low

(1)
where:
K is Boltzmann’s constant
T is Absolute Temperature in Kelvin
q is Charge Electron
n is Diode Ideality factor
The change in forward bias voltage is now proportional to absolute temperature T.
Revision 2.3 (04-19-05)
6
DATASHEET
SMSC EMCT03

6 Page









EMCT03-ACZL pdf, datenblatt
1°C Triple SMBus Temperature Sensor
Datasheet
A conversion for all 3 temperature readings takes about 60ms. Therefore, the maximum conversion
rate, equals 16 conversions per second.
Bits 6 set of the Configuration Register sets the power mode of the part:
Table 3.12 Configuration Registers Data Format
NRUN/STOP
0
1
DESCRIPTION
Run Mode
Standby Mode
In Run Mode, the EMCT03 will operate at the preset conversion rate. In Standby Mode, the part is
powered down to minimize current consumption. The SMBus is fully operational in either mode. In
Standby Mode, a WRITE command to the One Shot register will trigger a one time conversion of the
3 temperature monitors. After the part finishes the conversion, it will go back to Standby Mode. The
host can now read the updated temperature information.
Revision 2.3 (04-19-05)
12
DATASHEET
SMSC EMCT03

12 Page





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