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EMC1201 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 EMC1201
기능 (EMC1201 / EMC1202) Single/Dual Single-Wire Temp Sensor
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EMC1201 데이터시트, 핀배열, 회로
EMC1201/EMC1202
Single/Dual Single-Wire Temp
Sensor in SOT23-5 Using
SMSC BudgetBusTMSensor
Interface
PRODUCT FEATURES
Datasheet
General Description
The EMC1201 and EMC1202 are temperature sensors
that communicate with a host over a single-wire SMSC
BudgetBus™ Sensor Interface. The EMC1201 has an
internal temperature sensor and the EMC1202 adds one
remote diode. Packaged in a SOT23-5, the EMC1201
provides an accurate, low-cost, low-current, solution for
critical temperature monitoring in applications such as
embedded systems or computers. 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 extends 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
EMC1201
EMC1202
INTERNAL
TEMPERATURE
MONITOR
1
1
EXTERNAL
TEMPERATURE
MONITOR
0
1
Features
„ Single-wire SMSC BudgetBus™ Sensor Interface
„ Low Power, 3.0V to 3.6V Supply
— < 50uA at 1 conversion per second
— < 3uA 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
„ SOT23-5 Green, Lead-free Packages
Applications
„ Desktop and Notebook Computers
„ Thermostats
„ Smart batteries
„ Industrial/Automotive
„ Other Electronic Systems
Simplified Block Diagram
EMC1201/EMC1202
Switching
Current
Local Temp
Diode
DP
DN
External
Diode for
EMC1202
Only
Analog
Mux
11-bit
delta-sigma
ADC
Temperature
Registers
BBUS
Interface
BBUS
SMSC EMC1201/EMC1202
DATASHEET
Revision 1.0 (06-14-06)




EMC1201 pdf, 반도체, 판매, 대치품
1.2
Single/Dual Single-Wire Temp Sensor in SOT23-5 Using SMSC BudgetBusTMSensor Interface
Datasheet
Absolute Maximum Ratings
Table 1.2 EMC1201/EMC1202 Maximum Ratings
DESCRIPTION
Supply Voltage VDD
Voltage on any other pin
Operating Temperature Range
Storage Temperature Range
Lead Temperature Range
Package Thermal Characteristics for SOT23-5
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
131.7
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 1.0 (06-14-06)
4
DATASHEET
SMSC EMC1201/EMC1202

4페이지










EMC1201 전자부품, 판매, 대치품
Single/Dual Single-Wire Temp Sensor in SOT23-5 Using SMSC BudgetBusTMSensor Interface
Datasheet
VDD
Ihigh
Ilow Ibias
fs
fs
fs
fs/2048
Internal or
Remote Diode
Bias
Diode
Delta Vbe
Sample
&
Hold
1-bit
Sigma
Delta
Modulator
Digital
Averaging
Filter
11-bit
Accurate
Conversion
3.1.1
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
EMC1201 and EMC1202 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.
EMC1202 Temperature Monitoring
The EMC1202, incorporates one internal diode and can monitor an additional temperature zone via
one external diode. An internal analog multiplexer switches between the internal and external diode.
Total conversion time for one internal and one external temperature reading is about 40ms. The
external diode 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:
3.2
to
DP
to
DN
Local Ground
to to
DP DP
to to
DN DN
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 EMC1202 External Diode Examples
SMSC BudgetBus™ Sensor Interface
The EMC1201 and EMC1202 communicate with a host controller, such as the KBC1100, through the
proprietary single wire SMSC BudgetBus™ Sensor Interface known as BBUS. The BBUS is a single
SMSC EMC1201/EMC1202
7
DATASHEET
Revision 1.0 (06-14-06)

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EMC1201

(EMC1201 / EMC1202) Single/Dual Single-Wire Temp Sensor

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