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PDF ( 数据手册 , 数据表 ) EMC1072

零件编号 EMC1072
描述 Temperature Sensor
制造商 SMSC
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EMC1072 数据手册, 描述, 功能
EMC1072
1°C Temperature Sensor
with Selectable Address
PRODUCT FEATURES
Datasheet
General Description
Features
The EMC1072 is a high accuracy, low cost, System
Management Bus (SMBus) temperature sensor with pin
selectable SMBus address.
The device provides ±1° accuracy (max) for external
diode temperatures and ±2°C accuracy (max) for the
internal diode temperature. The EMC1072 monitors two
temperature channels (one external and one internal).
„ Pin Compatible with ADM1032, MAX6649, and LM99
„ External Temperature Monitors
— ±0.25°C typ accuracy (20°C < TDIODE < 110°C)
— 0.125°C resolution
— Supports 2N3904 and AMD diodes
„ Internal Temperature Monitor
— ±0.25°C typ accuracy (-5°C < TA < 100°C)
„ 3.3V Supply Voltage
Applications
„ SMBus 2.0 Compliant
— Programmable SMBus address
„ Notebook Computers
„ Desktop Computers
„ Industrial
„ Embedded applications
„ Programmable Temperature Limits for ALERT and
THERM
„ Available in Small 8-pin MSOP Lead-free RoHS
Compliant Package
Block Diagram
EMC1072
VDD
Switching
Current
DP
DN
Internal Temp
Diode
Analog
Mux
ΔΣ ADC
External Temperature
Register(s)
Internal
Temperature Register
Status Registers
GND
Conversion Rate Register
Low Limit Registers
High Limit Registers
THERM Limit Register
THERM Hysteresis Register
SMCLK
SMDATA
Configuration Register
Interupt Masking
SMBus Address Decode
ALERT
THERM/ADDR
SMSC EMC1072
DATASHEET
Revision 1.39 (10-11-10)







EMC1072 pdf, 数据表
Chapter 2 Pin Description
1°C Temperature Sensor with Selectable Address
Datasheet
VDD
DP
DN
THERM / ADDR
1
2
3
4
8 SMCLK
7 SMDATA
6 ALERT
5 GND
Figure 2.1 EMC1072 Pin Diagram
PIN NUMBER
1
2
3
4
5
6
7
8
Table 2.1 EMC1072 Pin Description
NAME
VDD
DP
DN
THERM / ADDR
GND
ALERT
SMDATA
SMCLK
FUNCTION
Power supply
External diode positive (anode)
connection
External diode negative (cathode)
connection
Active low Critical THERM output
signal - requires pull-up resistor to
set SMBus Address
Ground
Active low digital ALERT output
signal - requires pull-up resistor
SMBus Data input/output
SMBus Clock input
TYPE
Power
AIO
AIO
OD (5V)
Power
OD (5V)
DIOD (5V)
DI (5V)
The pin types are described below. All pins labelled with (5V) are 5V tolerant.
APPLICATION NOTE: For the 5V tolerant pins that have a pull-up resistor (SMCLK, SMDATA, THERM, and
ALERT), the voltage difference between VDD and the pull-up voltage must never exceed
3.6V.
Power - these pins are used to supply either VDD or GND to the device.
AIO - Analog Input / Output.
DI - Digital Input.
OD - Open Drain Digital Output.
DIOD - Digital Input / Open Drain Output.
Revision 1.39 (10-11-10)
8
DATASHEET
SMSC EMC1072







EMC1072 equivalent, schematic
5.1.2
1°C Temperature Sensor with Selectable Address
Datasheet
Dynamic Averaging
Dynamic averaging causes the EMC1072 to measure the external diode channels for an extended time
based on the selected conversion rate. This functionality can be disabled for increased power savings
at the lower conversion rates (see Section 6.4, "Configuration Register"). When dynamic averaging is
enabled, the device will automatically adjust the sampling and measurement time for the external diode
channels. This allows the device to average 2x or 16x longer than the normal 11 bit operation
(nominally 21ms per channel) 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 of the temperature measurement.
When enabled, 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.
When enabled, the dynamic averaging will affect the average supply current based on the chosen
conversion rate as shown in Table 5.1 for the EMC1072.
Table 5.1 Supply Current vs. Conversion Rate for EMC1072
CONVERSION RATE
1 / 16 sec
1 / 8 sec
1 / 4 sec
1 / 2 sec
1 / sec
2 / sec
4 / sec (default)
8 / sec
16 / sec
32 / sec
64 / sec
AVERAGE SUPPLY CURRENT
ENABLED
(DEFAULT)
660uA
660uA
660uA
660uA
660uA
930uA
950uA
1010uA
1020uA
1050uA
1100uA
DISABLED
430uA
430uA
430uA
430uA
430uA
475uA
510uA
630uA
775uA
1050uA
1100uA
AVERAGING FACTOR (BASED ON
11-BIT OPERATION)
ENABLED
(DEFAULT)
16x
16x
16x
16x
16x
16x
8x
4x
2x
1x
0.5x
DISABLED
1x
1x
1x
1x
1x
1x
1x
1x
1x
1x
0.5x
5.2
THERM Output
The THERM output is asserted independently of the ALERT output and cannot be masked. Whenever
any of the measured temperatures exceed the user programmed THERM Limit values for the
programmed number of consecutive measurements, the THERM output is asserted. Once it has been
asserted, it will remain asserted until all measured temperatures drop below the THERM Limit minus
the THERM Hysteresis (also programmable).
When the THERM pin is asserted, the Therm status bits will likewise be set. Reading these bits will
not clear them until the THERM pin is deasserted. Once the THERM pin is deasserted, the THERM
status bits will be automatically cleared.
Revision 1.39 (10-11-10)
16
DATASHEET
SMSC EMC1072










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