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PDF TC1068 Data sheet ( Hoja de datos )
| Número de pieza | TC1068 | |
| Descripción | SMBus Thermal Sensor | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TC1068 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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EVALUATION
KIT
AVAILABLE
SMBus Thermal Sensor with External Diode Input
TC1068
FEATURES
s Backward Compliant to Older APM Systems
s Includes Internal and 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#/COMP# Interrupt Output
s SMBus 2-Wire Serial Interface
s Up To Nine TC1068s May Share the Same Bus
s Standby Mode for Low Standby Power
s Low Power .......................... 70 µA (max) Operating
...................................... 10 µA (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
BLOCK DIAGRAM
Internal
Sensor
(Diode)
D+ ∆∑
D–
Modulator
Control
Logic
Register Set
Int. Temp
Ext. Temp
Status Byte
Config. Byte
Conv. Rate
Ext. Hi Limit
Ext. Lo Limit
Int. Hi Limit
Int. Lo Limit
SMBus
Interface
INT_SEL
ALERT#/COMP#
STBY#
SCL
SDA
ADD 0
ADD 1
GENERAL DESCRIPTION
The TC1068 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 TC1068 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#/COMP# pin
when temperature moves outside the preset threshold win-
dows in either direction.
A Standby command may be sent via the SMBus or by
signaling the STBY# input pin to activate the low-power
Standby mode. Registers can be accessed while in Standby
mode. Address selection inputs allow up to nine TC1068s 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 TC1068
an ideal choice for implementing sophisticated system man-
agement schemes, such as ACPI.
ORDERING INFORMATION
Part No.
TC1068MQR
TCM1617EV
Package
Temp. Range
QSOP-16
–55°C to +125°C
Evaluation Kit Available
PIN CONFIGURATION
16-Pin Plastic QSOP
NC 1
VDD 2
D+ 3
D– 4
NC 5
ADD 1 6
GND 7
GND 8
TC1068
16 NC
15 STBY#
14 SCL
13 INT_SEL
12 SDA
11 ALERT#/COMP#
10 ADD0
9 NC
© 2001 Microchip Technology Inc. DS21352A
1
TC1068-1 2/8/99
1 page  
SMBus Thermal Sensor with
External Diode Input
PIN DESCRIPTION
Pin Number
Symbol
2
3
4
6,10
7,8
11
12
14
15
13
1, 5, 9, 16
VDD
D+
D–
ADD[1:0]
GND
ALERT#/COMP#
SDA
SCL
STBY#
INT_SEL
NC
Type
Power
Bi-Directional
Bi-Directional
Input
Power
Output
Bi-Directional
Input
Input
Input
—
TC1068
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#) or Comparator Output
SMBus Serial Data
SMBus Serial Clock
Standby Enable
Selects ALERT# or COMP# Output on Pin 11
Not Connected
PIN DESCRIPTION
SCL
Input. SMBus serial clock. Clocks data into and out of
the TC1068. See System Management Bus Specification,
rev. 1.0, for timing diagrams.
SDA
Bidirectional. Serial data is transferred on the SMBus in
both directions using this pin. See System Management Bus
Specification, rev. 1.0, for timing diagrams.
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.
(NOTE: The tri-state scheme allows up to nine TC1068s
on a single bus. A match between the TC1068’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 Specification, rev. 1.0, for ad-
dress allocations). These pins are only active at power-on
reset, and will latch into the appropriate states.
1. INT_TEMP equal to or exceeds INT_HLIM
2. INT_TEMP below INT_LLIM
3. EXT_TEMP equal to or exceeds EXT_HLIM
4. EXT_TEMP below EXT_LLIM
5. External Diode “Open”
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 rearmed by the Alert Response Ad-
dress (ARA). This output may be WIRE-ORed with similar
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 TC1068. To avoid affecting the
accuracy of internal temperature readings, the pull-up resis-
tors should be made as large as possible.)
Normally the COMP# output will be asserted upon the
following events:
1. EXT_TEMP equal to or exceeds EXT_HLIM
2. External Diode “Open”
ALERT#/COMP#*
COMP# will be de-asserted upon the following event:
Output, Open Collector, Active Low. The ALERT# out- EXT_TEMP below EXT_HLIM.
put corresponds to the general SMBALERT# signal and
The operation of the COMP# output is controlled by the
indicates an interrupt event. The TC1068 will respond to the MASK1 bit in the CONFIG register. If the MASK1 bit is set to
standard SMBus Alert Response Address (see SMBus “1,” no interrupts will be generated on COMP#. This output
Specification 1.0) and associated protocol when ALERT# is may be WIRE-ORed with similar outputs from other SMBus
asserted. Normally, the ALERT# output will be asserted and devices. Note: A pull-up resistor is necessary on COMP#
latched when any of the following occurs:
since it is an open-drain output. Current sourced from the
© 2001 Microchip Technology Inc. DS21352A
5
TC1068-1 2/8/99
5 Page 
SMBus Thermal Sensor with
External Diode Input
TC1068
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 exter-
nal 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
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
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
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. DS21352A
11
TC1068-1 2/8/99
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet TC1068.PDF ] | |
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