EMC1001-AFZQ-TR SMSC, EMC1001-AFZQ-TR Datasheet - Page 9

• Manufacturer Part Number: EMC1001-AFZQ-TR
• Description: Board Mount Temperature Sensors SMBus Temp Snsr
• Manufacturer: SMSC

Specifications of EMC1001-AFZQ-TR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

1.5°C SMBus Temperature Sensor in Miniature SOT-23
Datasheet
Chapter 4 Product Description
SMSC EMC1001
4.1
The EMC1001 is an SMBus temperature that monitors a single temperature zone. Thermal
management is performed in cooperation with a host device. The host reads the temperature data from
the EMC1001 and takes appropriate action such as controlling fan speed or processor clock frequency.
The EMC1001 has programmable temperature limit registers that define a safe operating window. After
the host has configured the temperature limits, the EMC1001 can operate as a free-running
independent watchdog to warn the host of temperature hot spots without requiring the host to poll the
device. The
The EMC1001 has two basic modes of operation:
Thermal diode temperature measurements are based on the change in forward bias voltage (ΔV
a diode when operated at two different currents:
The change in
Temperature Monitors
Run Mode: In this mode, the EMC1001 continuously converts temperature data and updates its
registers. The rate of temperature conversion is configured as shown in
Standby Mode: In this mode, the EMC1001 is placed in standby to conserve power as described
in
EMC1001
Δ
Section 4.5 on page
Internal
Diode
V
BE
=
ADDR
V
Figure 4.1 Controlling a fan without host intervention.
Δ
BE
V
/
_
BE
THERM
HIGH
voltage is proportional to absolute temperature T.
SMDATA
ALERT/THERM2
ADDR/THERM
SMCLK
−
output can be used to control a fan without host intervention.
V
12.
BE
_
LOW
DATASHEET
=
η
kT
q
9
ln
⎛
⎜ ⎜
⎝
Interface
I
I
SMBus
HIGH
LOW
Host
⎞
⎟ ⎟
⎠
where:
k = Boltzmann’s constant
T = absolute temperature in Kelvin
q = electron charge
η
= diode ideality factor
Driver
Fan
Section 4.9 on page
Revision 1.6 (01-29-07)
BE
14.
) of