TCM1617 Datasheet, PDF (1/14 Pages) Microchip Technology – SMBus Thermal Sensor with External Diode Input

EVALUATION
KIT
AVAILABLE
SMBus Thermal Sensor with External Diode Input
TCM1617
FEATURES
s Includes Internal External Sensing Capability
s Outputs Temperature as 8-Bit Digital Word
s Solid State Temperature Sensing; 1°C Resolution
s 3.0 – 5.5V Operating Range
s Independent Internal and External Threshold
Set-Points With ALERT# Interrupt Output
s SMBus 2-Wire Serial Interface
s Up To Nine TCM1617s May Share the Same Bus
s Standby Mode for Low Standby Power
s Low Power ............................ 70µA (max) Operating
...................................... 10µA (max) Standby Mode
s 16-Pin Plastic QSOP Package
TYPICAL APPLICATIONS
s Thermal Protection For Intel “Deschutes”
Pentium II™ and Other High Performance CPUs
with Integrated On-Board Diode — No Sensor
Mounting Problems!
s Accurate Thermal Sensing From Any Si Junction
Diode
s Thermal Management in Electronic Systems:
Computers, Network Equipment, Power Supplies
GENERAL DESCRIPTION
The TCM1617 is a serially programmable temperature
sensor optimized for monitoring modern high performance
CPUs with on-board integrated thermal diodes. Tempera-
ture data is converted from the CPU’s thermal diode outputs
and made available as an 8-Bit digital word.
Communication with the TCM1617 is accomplished via
the standard System Management Bus (SMBus) commonly
used in modern computer systems. This permits reading the
current internal/external temperature, programming the
threshold setpoints, and configuring the device. Addition-
ally, an interrupt is generated on the ALERT# pin when
temperature moves outside the preset threshold windows in
either direction.
A Standby command may be sent via the SMBus by
signaling the STBY# input to activate the low-power Standby
mode. Registers can be accessed while in Standby mode.
Address selection inputs allow up to nine TCM1617s to
share the same 2-wire SMBus for multi-zone monitoring.
All registers can be read by the host, and both polled and
interrupt driven systems are easily accommodated. Small
size, low installed cost, and ease of use make the TCM1617
an ideal choice for implementing sophisticated system man-
agement schemes, such as ACPI.
BLOCK DIAGRAM
Internal
Sensor
(Diode)
D⁺
∆∑
D^–
Modulator
Register Set
Int. Temp
Ext. Temp
Status Byte
Config. Byte
Conv. Rate
Ext. Hi Limit
Ext. Lo Limit
Int. Hi Limit
Int. Lo Limit
Control
Logic
SMBus
Interface
 2001 Microchip Technology Inc. DS21485A
ALERT#
STBY#
SCL
SDA
ADD 0
ADD 1
ORDERING INFORMATION
Part No.
Package
Temp. Range
TCM1617MQR QSOP-16
–55°C to +125°C
TCM1617EV Evaluation Kit for TCM1617
PIN CONFIGURATION
NC ₁
V_DD 2
D+ 3
D– 4
NC 5
ADD 1 6
GND 7
GND 8
TCM1617
16 NC
15 STBY#
14 SCL
13 NC
12 SDA
11 ALERT#
10 ADD0
9 NC
16-Pin Plastic QSOP
1
TCM1617-1 2/5/99