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ADM1022 の電気的特性と機能

ADM1022のメーカーはAnalog Devicesです、この部品の機能は「Low-Cost PC Temperature Monitor and Fan Control ASIC」です。


製品の詳細 ( Datasheet PDF )

部品番号 ADM1022
部品説明 Low-Cost PC Temperature Monitor and Fan Control ASIC
メーカ Analog Devices
ロゴ Analog Devices ロゴ 




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ADM1022 Datasheet, ADM1022 PDF,ピン配置, 機能
a
Low-Cost PC Temperature
Monitor and Fan Control ASIC
ADM1022
FEATURES
External Temperature Measurement with Remote
Diode (Two Channels)
On-Chip Temperature Sensor
Interrupt and Over-Temperature Outputs
Fault Tolerant Fan Control
Brownout Detection
LDCM Support
System Management Bus (SMBus)
Standby Mode to Minimize Power Consumption
Limit Comparison of all Monitored Values
APPLICATIONS
Network Servers and Personal Computers
Microprocessor-Based Office Equipment
Test Equipment and Measuring Instruments
GENERAL DESCRIPTION
The ADM1022 is a low cost temperature monitor and fan con-
troller for microprocessor-based systems. The temperature of
one or two remote sensor diodes may be measured, allowing
monitoring of processor temperature in single- or dual-pro-
cessor systems.
Measured values can be read out via a serial System Manage-
ment Bus, and values for limit comparisons can be programmed
in over the same serial bus.
The ADM1022 also contains a DAC for fan speed control.
Automatic hardware temperature trip points are provided and
the fan will be driven to full speed if they are exceeded.
Finally, the chip has two supply voltage monitors for brownout
detection.
The ADM1022’s 3.0 V to 5.5 V supply voltage range, low supply
current, and SMBus interface make it ideal for a wide range of
applications. These include hardware monitoring and protection
applications in personal computers, electronic test equipment
and office electronics.
FUNCTIONAL BLOCK DIAGRAM
VCC VMON
RST1
RESET
GENERATOR 1
ADM1022
RST2
VCC
20k
MR
RESET
GENERATOR 2
BANDGAP
TEMPERATURE
SENSOR
D1+
D1–
D2+/GPI
D2–/THERM
ANALOG
MULTIPLEXER
ADDRESS
POINTER
REGISTER
ADC
2.5V
BANDGAP
REFERENCE
SERIAL BUS
INTERFACE
ANALOG
OUTPUT
REGISTER
AND 8-BIT DAC
VALUE AND
LIMIT
REGISTERS
LIMIT
COMPARATORS
INTERRUPT
STATUS
REGISTERS
INT MASK
REGISTER
MASK
GATING
CONFIGURATION
REGISTER
ADD/NTEST_OUT
SDA
SCL
FAN_SPD/NTEST_IN
INT
FAN_OFF
GND
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000

1 Page





ADM1022 pdf, ピン配列
ADM1022
Parameter
Min Typ Max Unit
Test Conditions
DIGITAL INPUT LOGIC LEVELS
(FAN_SPD/NTEST_IN,
ADD/NTEST_OUT, MR, GPI)
Input High Voltage, VIH
Input Low Voltage, VIL
2.2 V
0.8 V
DIGITAL INPUT LEAKAGE CURRENT
(ALL DIGITAL INPUTS)
Input High Current, IIH
Input Low Current, IIL
Input Capacitance, CIN
SERIAL BUS TIMING3
Clock Frequency, fSCLK
Glitch Immunity, tSW
Bus Free Time, tBUF
Start Setup Time, tSU:STA
Start Hold Time, tHD:STA
Stop Condition Setup Time, tSU:STO
SCL Low Time, tLOW
SCL High Time, tHIGH
SCL, SDA Rise Time, tR
SCL, SDA Fall Time, tF
Data Setup Time, tSU:DAT
Data Hold Time, tHD:DAT
–1 –0.005
+0.005 +1
5
50
1.3
600
600
600
1.3
0.6
100
300
400
300
300
µA
µA
pF
kHz
ns
µs
ns
ns
ns
µs
µs
ns
ns
ns
ns
VIN = VCC
VIN = 0
See Figure 1
See Figure 1
See Figure 1
See Figure 1
See Figure 1
See Figure 1
See Figure 1
See Figure 1
See Figure 1
See Figure 1
See Figure 1
See Figure 1
NOTES
1Typicals are at TA = 25°C and represent most likely parametric norm. Standby current typ is measured with V CC = 3.3 V.
2ADD is a three-state input that may be pulled high, low or left open-circuit.
3Timing specifications are tested at logic levels of VIL = 0.8 V for a falling edge and VIH = 2.2 V for a rising edge.
Specifications subject to change without notice.
SCL
tLOW
tR
tF
tHD;STA
tHD;DAT
tHIGH
tSU;DAT
tHD;STA
tSU;STA
SDA
tBUF
PS
S
Figure 1. Diagram for Serial Bus Timing
tSU;STO
P
REV. 0
–3–


3Pages


ADM1022 電子部品, 半導体
ADM1022–Typical Performance Characteristics
30
20
10
DXP TO GND
0
10
DXP TO VCC (5V)
20
30
40
50
60
1
3.3 10
30
LEAKAGE RESISTANCE M
100
Figure 2. Temperature Error vs. PC Leakage Resistance
120
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100 110
MEASURED TEMPERATURE
Figure 5. Pentium® III Temperature Measurement vs.
ADM1022 Reading
6
5
4
250mV p-p REMOTE
3
2
1
100mV p-p REMOTE
0
1
50
500
5k 50k 500k
FREQUENCY Hz
5M 50M
Figure 3. Temperature Error vs. Power Supply Noise
Frequency
30
25
20
15
ERROR
10
5
0
5
1.0 2.2 3.2 4.7 7.0 10.0 14.0 22.0 29.0
DXP-DXN CAPACITANCE nF
Figure 6. Temperature Error vs. Capacitance Between D+
and D–
25
20
100mV p-p
15
10
50mV p-p
5
0 25mV p-p
5
50
500
5k 50k 500k
FREQUENCY Hz
5M 50M
Figure 4. Temperature Error vs. Common-Mode Noise
Frequency
80
70
60
50
40
VCC = 5V
30
20
10 VCC = 3V
0
0 1k 5k 10k 25k 50k 75k 100k 250k 500k 750k 1M
SCLK FREQUENCY Hz
Figure 7. Standby Current vs. Clock Frequency
Pentium is a registered trademark of Intel Corporation.
–6–
REV. 0

6 Page



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