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PDF TCM1617MQR Data sheet ( Hoja de datos )
| Número de pieza | TCM1617MQR | |
| Descripción | SMBus Thermal Sensor with External Diode Input | |
| Fabricantes | Microchip Technology | |
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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
VDD 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
1 page  
SMBus Thermal Sensor with External Diode Input
PIN DESCRIPTION
Pin Number
2
3
4
6,10
7,8
11
12
14
15
1,5, 9, 13,16
Symbol
VDD
D+
D–
ADD[1:0]
GND
ALERT#
SDA
SCL
STBY#
NC
Type
Power
Bi-Directional
Bi-Directional
Input
Power
Output
Bi-Directional
Input
Input
—
TCM1617
Description
Power Supply Input
Current Source and A/D Positive Input
Current Sink and A/D Negative Input
Address Select Pins (See Address Decode Table)
System Ground
SMBus Interrupt (SMBALERT#)
SMBus Serial Data
SMBus Serial Clock
Standby Enable
Not Connected
PIN DESCRIPTION
SCL
Input. SMBus serial clock. Clocks data into and out of
the TCM1617. See System Management Bus Specification,
rev. 1.0, for timing diagrams.
INT_TEMP equal to or exceeds INT_HLIM
INT_TEMP falls below INT_LLIM
SDA
EXT_TEMP equal to or exceeds EXT_HLIM
Bi-directional. Serial data is transferred on the SMBus
in both directions using this pin. See System Management
Bus Specification, rev. 1.0, for timing diagrams.
EXT_TEMP falls below EXT_LLIM
External Diode “Open”
ADD1, ADD0
Inputs. Sets the 7-bit SMBus address. These pins are
“tri-state,” and the SMBus addresses are specified in the
Address Decode Table below.
(NOTE: The tri-state scheme allows up to nine
TCM1617s on a single bus. A match between the TCM1617’s
address and the address specified in the serial bit stream
must be made to initiate communication. Many SMBus-
compatible devices with other addresses may share the
same 2-wire bus (see System Management Bus Specifica-
tion rev. 1.0 for address allocations). These pins are only
active at power-on reset, and will latch into the appropriate
states.
ALERT#
Output, Open Collector, Active Low. The ALERT# out-
put corresponds to the general SMBALERT# signal and
indicates an interrupt event. The TCM1617 will respond to
the standard SMBus Alert Response Address (see SMBus
Specification 1.0) and associated protocol when ALERT# is
asserted. Normally, the ALERT# output will be asserted
when any of the following occurs:
The operation of the ALERT# output is controlled by the
MASK1 bit in the CONFIG register. If the MASK1 bit is set to
“1,” no interrupts will be generated on ALERT#. The ALERT#
output is cleared and re-armed by the Alert Response
Address (ARA). This output may be WIRE-ORed with simi-
lar outputs from other SMBus devices. If the alarm condition
persists after the ARA, the ALERT# output will be immedi-
ately re-asserted.
(NOTE: A pull-up resistor is necessary on ALERT#
since it is an open-drain output. Current sourced from the
pull-up resistor causes power dissipation and may cause
internal heating of the TCM1617. To avoid affecting the
accuracy of internal temperature readings, the pull-up resis-
tors should be made as large as possible.)
STBY#
Input. The activation of Standby mode may be achieved
using either the STBY# pin or the CHIP STOP bit (CONFIG
register). If STBY# is pulled low, the TCM1617 uncondition-
ally enters its low-power Standby mode (IDD = 10 µA, max).
The temperature-to-digital conversion process is halted, but
ALERT remains functional. The TCM1617’s bus interface
2001 Microchip Technology Inc. DS21485A
5
TCM1617-1 2/5/99
5 Page 
SMBus Thermal Sensor with External Diode Input
TCM1617
Temperature Registers, 8-Bits, Read-Only
(INT_TEMP, EXT_TEMP)
The binary value (2’s complement format) in these two
registers represents temperature of the internal and external
sensors following a conversion cycle. The registers are
automatically updated in an alternating manner.
Internal Temperature Register (INT_TEMP)
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB x
x
x
x x x LSB
External Temperature Register (EXT_TEMP)
D[7] D[6] D[5] D[4] D[3] D[2] D[1]
MSB x
x
x
x xx
D[0]
LSB
In the two temperature data and four threshold setpoint
registers, each unit value represents one degree (Celsius).
The value is in 2’s-complement binary format such that a
reading of 00000000b corresponds to 0°C. Examples of this
temperature-to-binary value relationship are shown in the
following table.
Temperature-to-Digital Value Conversion
(INT_TEMP, EXT_TEMP, INT_HLIM, INT_LLIM,
EXT_HLIM, EXT_LLIM)
Actual
Temperature
+130.00°C
+127.00°C
+126.50°C
+25.25°C
+0.50°C
+0.25°C
0.00°C
–0.25°C
–0.50°C
–0.75°C
–1.00°C
–25.00°C
–25.25°C
–54.75°C
–55.00°C
–65.00°C
Rounded
Temperature
+127°C
+127°C
+127°C
+25°C
+1°C
0°C
0°C
0°C
0°C
–1°C
–1°C
–25°C
–25°C
–55°C
–55°C
–65°C
Binary
Value
01111111
01111111
01111111
00011001
00000001
00000000
00000000
00000000
00000000
11111111
11111111
11100111
11100110
11001001
11001001
10111111
Hex
Value
7F
7F
7F
19
01
00
00
00
00
FF
FF
E7
E7
C9
C9
BF
Temperature Threshold Setpoint Registers,
8-Bits, Read-Write (INT_HLIM, INT_LLIM,
EXT_HLIM, EXT_LLIM)
These registers store the values of the upper and lower
temperature setpoints for event detection. The value is in
2’s-complement binary. INT_HLIM and INT_LLIM are com-
pared with the INT_TEMP value, and EXT_HLIM and
EXT_LLIM are compared with EXT_TEMP. These registers
may be written at any time.
Internal High Limit Setpoint Register (INT_HLIM)
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB x
x
x
x x x LSB
Internal Low Limit Setpoint Register (INT_LLIM)
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB x
x
x
x x x LSB
External High Limit Setpoint Register (EXT_HLIM)
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB x
x
x
x x x LSB
External Low Limit Setpoint Register (EXT_LLIM)
D[7] D[6] D[5]
MSB x
x
NOTE: POR states:
INT_HLIM
INT_LLIM
EXT_HLIM
EXT_LLIM
D[4] D[3]
xx
01111111b
11001001b
01111111b
11001001b
D[2] D[1] D[0]
x x LSB
+127°C
–55°C
+127°C
–55°C
2001 Microchip Technology Inc. DS21485A
11
TCM1617-1 2/5/99
11 Page | ||
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