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EMC1204 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 EMC1204
기능 (EMC1203 / EMC1204) Triple/Quad Single-Wire Temp Sensor
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EMC1204 데이터시트, 핀배열, 회로
EMC1203/EMC1204
Triple/Quad Single-Wire Temp
Sensor in MSOP-8 Using
SMSC BudgetBusTM Sensor
Interface
PRODUCT FEATURES
Datasheet
General Description
The EMC1203 and EMC1204 are temperature sensors
that communicate with a host over a single-wire SMSC
BudgetBus™ Sensor Interface. The EMC1203 has an
internal temperature sensor and monitors up to two
remote diodes. An additional remote diode is added with
the EMC1204 for a total of three remote zones, and both
devices are in a small MSOP-8 package. When used in
combination with an SMSC Super I/O host, such as a
keyboard controller, a complete thermal management
system is created. A power down mode preserves
battery life in portable applications. The internal 11-bit
sigma delta temperature-to-digital converter provides
superb linearity, high accuracy and excellent noise
immunity.
PART
NUMBER
EMC1203
EMC1204
INTERNAL
TEMPERATURE
MONITOR
1
1
REMOTE
TEMPERATURE
MONITOR
2
3
Features
„ Single-wire SMSC BudgetBus™ Sensor Interface
„ Low Power, 3.0V to 3.6V Supply
— < 50uA at 1 conversion per second
— < 2.5uA in Standby
„ External Temperature Sensor
— Range -63.875º C to +191.875º C
— 0.125º C resolution
±1º C Accuracy 60º C to 100º C
— Diode Fault Reporting
„ Self Contained Internal Temperature Sensor
— Range 0º C to +85º C
— 0.125º C resolution
±3º C Accuracy 0º C to 85º C
„ MSOP-8 3x3mm lead-free RoHS compliant packages
Applications
„ Desktop Computers
„ Notebook Computers
„ Server Applications
Simplified Block Diagram
Switching
Current
EMC1203/EMC1204
DP1
DN1
DP2/DN3
DN2/DP3
Local Temp
Diode
11-bit
Sigma Delta
ADC
Temperature
Registers
BBUS
Interface
BBUS
SMSC EMC1203/EMC1204
DATASHEET
Revision 1.1 (06-11-08)




EMC1204 pdf, 반도체, 판매, 대치품
Triple/Quad Single-Wire Temp Sensor in MSOP-8 Using SMSC BudgetBusTM Sensor Interface
Datasheet
1.2 Absolute Maximum Ratings
Table 1.2 EMC1203 and EMC1204 Maximum Ratings
DESCRIPTION
Supply Voltage VDD
Voltage on any other pin
Operating Temperature Range
Storage Temperature Range
Lead Temperature Range
Package Thermal Characteristics for MSOP-8
Power Dissipation
Thermal Resistance(at 0 air flow)
ESD Rating, All Pins Human Body Model
RATING
-0.3 to 5.0
-0.3 to VDD +0.3
0 to 85
-55 to 150
Refer to JEDEC
Spec. J-STD-020
TBD
109.6
2000
UNIT
V
V
°C
°C
°C/W
V
Note:
Stresses above those listed could cause damage to the device. This is a stress rating only
and functional operation of the device at any other condition above those indicated in the
operation sections of this specification is not implied. When powering this device from
laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be
exceeded or device failure can result. Some power supplies exhibit voltage spikes on their
outputs when the AC power is switched on or off. In addition, voltage transients on the AC
power line may appear on the DC output. If this possibility exists, it is suggested that a clamp
circuit be used.
Revision 1.1 (06-11-08)
4
DATASHEET
SMSC EMC1203/EMC1204

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EMC1204 전자부품, 판매, 대치품
Triple/Quad Single-Wire Temp Sensor in MSOP-8 Using SMSC BudgetBusTM Sensor Interface
Datasheet
VDD
Ihigh
Ilow Ibias
3.1.1
Internal
or External
Diode
Bias
Diode
Delta Vbe
Sample
&
Hold
1-bit
Sigma
Delta
Modulator
Digital
Averaging
Filter
11-bit Output
Figure 3.2 Detailed Block Diagram of Temperature Monitor Architecture
Figure 3.2 shows a detailed block diagram of the temperature measurement circuit. As shown, the
EMC1203 and EMC1204 incorporates switched capacitor technology that samples the temperature
diode voltage at two bias currents and holds the difference voltage. The sample frequency is 100kHz
and the current levels Ihigh and Ilow are 170uA and 10uA respectively.
The output of the switched capacitor sample and hold circuit interfaces to a single bit delta sigma
analog to digital converter. This ADC runs at 100kHz sample frequency and its output is digitally filtered
and averaged over 2048 samples effectively generating 11 bit accuracy.
The advantages of this architecture over Nyquist rate FLASH or SAR converters are superb linearity
and inherent noise immunity. The linearity can be directly attributed to the delta sigma ADC single bit
comparator while the noise immunity is achieved by the digital averaging filter. The overall effective
bandwidth of the system is fs/2048 which translates to a 50Hz bandwidth at 100kHz sample rate.
Conversion time equals about 20ms per temperature monitor.
EMC1203 Temperature Monitoring
The EMC1203, incorporates one internal diode and can monitor two additional temperature zones with
two external diodes.An internal analog multiplexer switches between the internal and external diodes.
Total conversion time for one internal and two external temperature readings is about 60ms. The
external diodes can be either a CPU substrate diode or a discrete diode connected transistor like the
2N3904 or 2N3906. External diode connected transistors examples are shown in Figure 3.3:
to
DP
to
DN
Local Ground
to to
DP DP
to to
DN DN
3.1.2
Typical remote
substrate transistor
i.e. CPU substrate PNP
Typical remote
discrete PNP transistor
i.e. 2N3906
Typical remote
discrete NPN transistor
i.e. 2N3904
Figure 3.3 EMC1203 External Diode Examples
EMC1204 Temperature Monitoring
The EMC1204, incorporates one internal diode and can monitor three external diodes. Total conversion
time for one internal and three external temperature reading is 80ms. An internal multiplexer switches
between internal and external diodes. The external thermal diode connected to DP1 and DN1 can
SMSC EMC1203/EMC1204
7
DATASHEET
Revision 1.1 (06-11-08)

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