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Teilenummer | EMC1043 |
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Beschreibung | Triple Temperature Sensor | |
Hersteller | SMSC | |
Logo | ||
Gesamt 29 Seiten EMC1043
1°C Triple Temperature
Sensor with Beta
Compensation and
Hotter of Two Zones
PRODUCT FEATURES
Datasheet
General Description
The EMC1043 is a family of System Management Bus
(SMBus) temperature sensors that monitors three
temperature zones, one internal diode and two
externally connected diodes, for PC and embedded
environments. The EMC1043 includes beta
compensation circuitry to correct for variation in the beta
of measurement transistors. Other extended features
include resistance error correction and ideality factor
configuration to eliminate major sources of temperature
measurement error.1
An added feature to the EMC1043 is a function that
automatically compares the two external temperature
zones and reports the hotter of the two temperatures.
Selectable conversion rates and standby mode support
low-power operation. The temperature measurement
ranges support two data ranges (and formats), -64°C to
+127°C and -64°C to +191°C.
Applications
Desktop and Notebook Computers
Hardware Management
Servers
Embedded Applications
Features
Supports two External Temperature Diodes
— ±1°C Accuracy (40°C to 80°C)
— 0.125°C Resolution
— Ideality Factor Configuration
— Accepts 2200pF Cap Across External Diodes for Noise
Suppression
— Optional Resistive Error Correction on External Diode 2
— Resistance Error Correction (up to 100 Ohms)
— Beta Compensation
Internal Temperature Diode
— ±3°C Accuracy (0°C to 85°C)
— 0.125°C Resolution
Low Power Operation
— 4uA Standby Current
3.0V to 3.6V Supply
Programmable Conversion Rate
SMBus 2.0 Compliant
— Four SMBus Address Available
Reports Hotter of Two Diodes with Dual-core CPU
1.Patents pending
Simplified Block Diagram
DP1
DN1
Switching
Current
DP2
DN2
Local Temp
Diode
SMSC EMC1043
11-bit
delta-sigma
ADC
External Diode
1 Register
External Diode
2 Register
Internal Diode
Register
Configuration
Register
Digital Mux
and
Byte Interlock
Status Register
DATASHEET
SMCLK
SMDATA
Revision 1.44 (04-14-08)
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Chapter 1 Pin Function
PIN
DP1
DN1
DP2
DN2
GND
VDD
SMDATA
SMCLK
DP1
DN1
DP2
DN2
18
27
8-MSOP
36
45
SMCLK
SMDATA
VDD
GND
Figure 1.1 EMC1043 Pin Diagram
PIN NO.
1
2
3
4
5
6
7
8
Table 1.1 EMC1043 Pin Description
DESCRIPTION
External Diode 1 Positive (anode) Connection
External Diode 1 Negative (cathode) Connection
External Diode 2 Positive (anode) Connection
External Diode 2 Negative (cathode) Connection
Ground
Supply Voltage
System Management Bus Data - bi-directional data, open drain output
System Management Bus Clock Input
Revision 1.44 (04-14-08)
6
DATASHEET
SMSC EMC1043
6 Page 3.3
3.3.1
3.3.2
1°C Triple Temperature Sensor with Beta Compensation and Hotter of Two Zones
Datasheet
Operation During Run Mode
When the device is active, there are two modes of operation available.
Normal Mode (power-up default) - In this mode of operation, the EMC1043 continuously samples
and updates all of its temperature channels.
Hotter of Two Mode - In this mode, the EMC1043 continuously samples and then compares the
two remote zones. The hotter of the two remote zones is loaded into the External Diode 2 Data
Registers. In addition, the HOTTER bit in the Status register is set or cleared to indicate which
external diode zone is hotter. If the two remote zones are exactly equal to each other, then the
HOTTER bit is cleared (set to ‘0’), and the results of the two remote zones are stored in their
respective registers.
Conversion Rates
The EMC1043 may be configured for different conversion rates based on the system requirements.
The available rates are 1 full set of conversions per second to 16 full sets of conversions per second.
The conversion rate is configured as described in Section 4.4. The available conversion rates are
shown in Table 4.4.
Dynamic Averaging
The EMC1043 temperature channels support a new feature that measures the external diode channels
for an extended time based on the selected conversion rate. This functionality can be disabled as
described in Section 4.5 for increased power savings at the lower conversion rates. When Dynamic
Averaging is enabled, the device will automatically adjust the sampling and measurement time for both
external diode channels. This allows the device to average 2x or 4x longer than the normal 11 bit
operation while still maintaining the selected conversion rate. The benefits of Dynamic Averaging are
improved noise rejection due to the longer integration time as well as less random variation on the
temperature measurement.
The Dynamic Averaging applies when a One-Shot command is issued. The device will perform the
desired averaging during the one-shot operation according to the selected conversion rate.
The Dynamic Averaging will affect the average supply current based on the chosen conversion rate
as shown in Table 3.1.
Table 3.1 Supply Current vs. Conversion Rate and ADC Averaging Factor
CONVERSION RATE
4X
(MAX_RES = 1)
(DA_N = 0)
1 / sec
2 / sec
4 / sec
8 / sec
16 / sec
190uA
315uA
580uA
N/A
N/A
ADC AVERAGING FACTOR
2X
(MAX_RES = 0)
(DA_N = 0)
132uA
205uA
350uA
640uA
N/A
1X
(DA_N = 1)
105uA
150uA
235uA
405uA
750uA
Revision 1.44 (04-14-08)
12
DATASHEET
SMSC EMC1043
12 Page | ||
Seiten | Gesamt 29 Seiten | |
PDF Download | [ EMC1043 Schematic.PDF ] |
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