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Teilenummer | ADM1032 |
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Beschreibung | Remote and Local System Temperature Monitor | |
Hersteller | ON Semiconductor | |
Logo | ||
Gesamt 18 Seiten ADM1032
+15C Remote and Local
System Temperature Monitor
The ADM1032 is a dual-channel digital thermometer and
under/overtemperature alarm intended for use in PCs and thermal
management systems. The device can measure the temperature of a
remote thermal diode, which can be located on the processor die or can
be a discrete device (2N3904/06), accurate to 1°C. A novel
measurement technique cancels out the absolute value of the
transistor’s base emitter voltage so that no calibration is required. The
ADM1032 also measures its ambient temperature.
The ADM1032 communicates over a 2-wire serial interface
compatible with System Management Bus (SMBus) standards.
Under/overtemperature limits can be programmed into the device over
the SMBus, and an ALERT output signals when the on−chip or remote
temperature measurement is out of range. This output can be used as
an interrupt or as a SMBus alert. The THERM output is a comparator
output that allows CPU clock throttling or on/off control of a cooling
fan. An ADM1032−1 and ADM1032−2 are available. The difference
between the ADM1032 and the ADM1032−1 is the default value of
the external THERM limit. The ADM1032−2 has a different SMBus
address. The SMBus address of the ADM1032−2 is 0x4D.
Features
• On-chip and Remote Temperature Sensing
• Offset Registers for System Calibration
• 0.125°C Resolution/1°C Accuracy on Remote Channel
• 1°C Resolution/3°C Accuracy on Local Channel
• Fast (Up to 64 Measurements Per Second)
• 2-wire SMBus Serial Interface
• Supports SMBus Alert
• Programmable Under/Overtemperature Limits
• Programmable Fault Queue
• Overtemperature Fail-safe THERM Output
• Programmable THERM Limits
• Programmable THERM Hysteresis
• 170 mA Operating Current
• 5.5 mA Standby Current
• 3.0 V to 5.5 V Supply
• Small 8-lead SOIC and MSOP Packages
• These are Pb-Free Devices*
Applications
• Desktop and Notebook Computers
• Smart Batteries
• Industrial Controllers
• Telecommunications Equipment
• Instrumentation
• Embedded Systems
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SOIC−8 NB
CASE 751
MSOP−8
CASE 846AB
PIN ASSIGNMENT
VDD
D+
D−
THERM
1
2
3
4
(Top View)
8 SCLK
7 SDATA
6 ALERT
5 GND
MARKING DIAGRAMS
8
1032AR
#YYWW
XXXX
8
1032AR
01
#YYWW
11
Marking #1
Marking #2
SOIC−8 NB
1023AR = Specific Device Code
# = Pb-Free Package
YY = Year
W = Work Week
XX = Assembly Lot
8
T1x
AYWG
G
1
MSOP−8
T1x = Refer to Order Info Table
A = Assembly Location
Y = Year
W = Work Week
G = Pb-Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 16 of this data sheet.
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2013
October, 2013 − Rev. 13
1
Publication Order Number:
ADM1032/D
ADM1032
TYPICAL PERFORMANCE CHARACTERISTICS (Cont’d)
12
10
VIN = 100 mV p−p
8
6
4
VIN = 50 mV p−p
2
0
100K
VIN = 25 mV p−p
1M 10M
100M
FREQUENCY (Hz)
Figure 9. Temperature Error vs. Common-mode
Noise Frequency
80
70
60
50
VDD = 5 V
40
30
20
10
VDD = 3.3 V
0
1 5 10 25 50 75 100 250 500 750 1000
SCLK FREQUENCY (kHz)
Figure 10. Standby Supply Current vs. Clock
Frequency
40
35
30
25
20
15
10
5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
Figure 11. Standby Supply Current vs. Supply Voltage
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6
6 Page ADM1032
SCLK
1
91
9
SDATA
START BY
MASTER
A6
A5 A4 A3 A2 A1 A0 R/W
D7
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
ADM1032
1
SCLK (CONTINUED)
D6 D5 D4 D3 D2 D1 D0
FRAME 2
ADDRESS POINTER REGISTER BYTE
9
ACK. BY
ADM1032
SDATA (CONTINUED)
D7 D6 D5 D4 D3 D2 D1 D0
FRAME 3
DATA BYTE
ACK. BY STOP BY
ADM1032 MASTER
Figure 13. Writing a Register Address to the Address Pointer Register,
then Writing Data to the Selected Register
SCLK
1
91
9
SDATA
START BY
MASTER
A6
A5 A4 A3 A2 A1 A0
FRAME 1
SERIAL BUS ADDRESS BYTE
R/W
D7
ACK. BY
ADM1032
D6 D5 D4 D3 D2 D1 D0
FRAME 2
ADDRESS POINTER REGISTER BYTE
ACK. BY
ADM1032
STOP BY
MASTER
Figure 14. Writing to the Address Pointer Register Only
SCLK
1
91
9
SDATA
A6 A5 A4 A3 A2 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
ADM1032
FRAME 2
DATA BYTE FROM ADM1032
ACK. BY STOP BY
ADM1032 MASTER
Figure 15. Reading Data from a Previously Selected Register
ALERT Output
The ALERT output goes low whenever an out-of-limit
measurement is detected, or if the remote temperature sensor
is open-circuit. It is an open drain and requires a pullup to
VDD. Several ALERT outputs can be wire-OR’ed together
so that the common line goes low if one or more of the
ALERT outputs goes low.
The ALERT output can be used as an interrupt signal to a
processor, or it can be used as an SMBALERT. Slave devices
on the SMBus can not normally signal to the master that they
want to talk, but the SMBALERT function allows them to do
so.
One or more ALERT outputs can be connected to a
common SMBALERT line connected to the master. When
the SMBALERT line is pulled low by one of the devices, the
following procedure occurs (see Figure 16).
MASTER
RECEIVES
SMBALERT
START
ALERT RESPONSE
ADDRESS
MASTER SENDS
ARA AND READ
COMMAND
RD ACK
DEVICE
ADDRESS
NO
ACK
STOP
DEVICE SENDS
ITS ADDRESS
Figure 16. Use of SMBALERT
1. SMBALERT is pulled low.
2. Master initiates a read operation and sends the
alert response address (ARA = 0001 100). This is
a general call address that must not be used as a
specific device address.
3. The device whose ALERT output is low responds
to the alert response address and the master reads
its device address. Since the device address is
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12
12 Page | ||
Seiten | Gesamt 18 Seiten | |
PDF Download | [ ADM1032 Schematic.PDF ] |
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