EMC1212
BBUS Compliant Dual
Temperature Monitor
with Beta Compensation
PRODUCT FEATURES
GENERAL DESCRIPTION
The EMC1212 is a temperature sensor that
communicates with a host over a single-wire SMSC
BudgetBus™ Sensor Interface. The EMC1212 monitors
one internal diode and one remote temperature zone.
Packaged in a SOT23-5, the EMC1212 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.
The EMC1212 is designed to operate with 65nm or
90nm PNP substrate transistor used as a thermal diode
with the collector connected to ground.
APPLICATIONS
Desktop and Notebook Computers
Hardware Management
FEATURES
Single Wire BBUS Interface
Resistance Error Correction
Beta Compensation
External Temperature Monitor
— 0.125°C resolution
— ±1°C Accuracy 60°C to 100°C
— Diode Fault Reporting
Datasheet
Internal Temperature Monitor
— Range 0°C to +85°C
— 0.125°C resolution
— ±1.5°C Accuracy 50°C to 70°C
Supply:
— 3.0V to 3.6V
— <5uA in Standby
SIMPLIFIED BLOCK DIAGRAM
EMC1212
Switching
Current
Local Temp
Diode
DP
DN
Beta
Comp
&
REC
Analog Mux
and
anti-aliasing
filter
11-bit
delta-sigma
ADC
Temperature
Registers
BBUS
Interface
BBUS
SMSC EMC1212
DATASHEET
Revision 1.1 (02-07-07)
SMSC [ SMSC CORPORATION ]
