EMC1203/EMC1204
Triple/Quad Single-Wire Temp
Sensor in MSOP-8 Using SMSC
BudgetBus
TM
Sensor Interface
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.
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 -63.875
º
C to +191.875
º
C
— 0.125
º
C resolution
—
±
1
º
C Accuracy 60
º
C to 100
º
C
— Diode Fault Reporting
Self Contained Internal Temperature Sensor
— Range 0
º
C to +85
º
C
— 0.125
º
C resolution
—
±3º
C Accuracy 0º C to 85º C
MSOP-8 3x3mm packages; green, lead-free
packages also available
PART
NUMBER
EMC1203
EMC1204
INTERNAL
TEMPERATURE
MONITOR
1
1
REMOTE
TEMPERATURE
MONITOR
2
3
Applications
Desktop Computers
Notebook Computers
Server Applications
Simplified Block Diagram
Switching
Current
EMC1203/EMC1204
DP1
DN1
Analog Mux
DP2/DN3
DN2/DP3
Local Temp
Diode
11-bit
Sigma Delta
ADC
Temperature
Registers
BBUS
Interface
BBUS
SMSC EMC1203/EMC1204
DATASHEET
Revision 1.1 (06-12-06)
SMSC [ SMSC CORPORATION ]
