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EMC1203 Schematic ( PDF Datasheet ) - SMSC Corporation

Teilenummer EMC1203
Beschreibung (EMC1203 / EMC1204) Triple/Quad Single-Wire Temp Sensor
Hersteller SMSC Corporation
Logo SMSC Corporation Logo 




Gesamt 10 Seiten
EMC1203 Datasheet, Funktion
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)






EMC1203 Datasheet, Funktion
Triple/Quad Single-Wire Temp Sensor in MSOP-8 Using SMSC BudgetBusTM Sensor Interface
Datasheet
Chapter 3 Product Description
The EMC1203 and EMC1204 are temperature sensors with a proprietary single wire SMSC
BudgetBus™ Sensor Interface. Temperature information is communicated to a host device via the
serial bus. All intelligence regarding the interpretation of temperature resides in the host. Figure 3.1,
"System Overview" shows a typical system overview:
EMC1203/
EMC1204
DP1
DN1
BBUS
DP2/DN3
DN2/DP3
Host
(KBC1100)
BBUS
Interface
3.1
Figure 3.1 System Overview
In cooperation with the host device, thermal management can be performed as shown in Figure 3.1.
Thermal management consists of the host acquiring the temperature data from the EMC1203 and
EMC1204 controlling the speed of one or more fans. The host has the ability to compare measured
temperature levels to preset limits and take the appropriate action when values are found to be out of
limit. The EMC1203 and the DP1/DN1 port of the EMC1204 are compatible with CPU substrate diodes.
Two separate temperature zones are monitored using only two pins on the EMC1204. This is
accomplished using two anti-parallel diodes as shown on the pins DP2/DN3 and DN2/DP3 in
Figure 3.1. This technique maintains high accuracy while minimizing pin count and reducing board
routing complexity. The anti-parallel diode architecture performs very well with diode connected
transistors. It is not compatible with substrate transistors (sometimes called thermal diodes or on-chip
sense junctions).
Temperature Monitors
Thermal diode temperature measurements are based on the change in forward bias voltage (ΔVBE) of
a diode when operated at two different currents:
ΔVBE
= VBE _ HIGH
VBE _ LOW
= ηkT
q
ln⎜⎜⎝⎛
I HIGH
I LOW
⎟⎟⎠⎞
where:
k = Boltzmann’s constant
T = absolute temperature in Kelvin
q = electron charge
η = diode ideality factor
The change in ΔVBE voltage is proportional to absolute temperature T.
Revision 1.1 (06-11-08)
6
DATASHEET
SMSC EMC1203/EMC1204

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