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ADM1024 데이터시트 PDF




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부품번호 ADM1024 기능
기능 System Hardware Monitor with Remote Diode Thermal Sensing
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ADM1024 데이터시트, 핀배열, 회로
a
System Hardware Monitor with
Remote Diode Thermal Sensing
ADM1024
FEATURES
Up to Nine Measurement Channels
Inputs Programmable-to-Measure Analog Voltage, Fan
Speed or External Temperature
External Temperature Measurement with Remote
Diode (Two Channels)
On-Chip Temperature Sensor
Five Digital Inputs for VID Bits
LDCM Support
System Management Bus (SMBus)
Chassis Intrusion Detect
Interrupt and Over Temperature Outputs
Programmable RESET Input Pin
Shutdown 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
PRODUCT DESCRIPTION
The ADM1024 is a complete system hardware monitor for
microprocessor-based systems, providing measurement and limit
comparison of various system parameters. Eight measurement
inputs are provided, of which three are dedicated to monitoring
5 V and 12 V power supplies and the processor core voltage.
The ADM1024 can monitor a fourth power-supply voltage by
measuring its own VCC. One input (two pins) is dedicated to a
remote temperature-sensing diode. Two further pins can be
(continued on page 7)
FUNCTIONAL BLOCK DIAGRAM
VID0/IRQ0
VID1/IRQ1
VID2/IRQ2
VID3/IRQ3
VID4/IRQ4
FAN1/AIN1
FAN2/AIN2
+VCCP1
+2.5VIN / D2+
+5VIN
+12VIN
VCCP2 / D2 –
D1+
D1–
VCC
VCC
VID0–3 AND
FAN DIVISOR
REGISTER
100k
PULLUPS
VID4 AND
DEVICE ID
REGISTER
FAN SPEED
COUNTER
ADM1024
ADDRESS
POINTER
REGISTER
INPUT
ATTENUATORS
AND
ANALOG
MULTIPLEXER
TEMPERATURE
CONFIGURATION
REGISTER
POWER TO CHIP
BANDGAP
TEMPERATURE
SENSOR
10-BIT ADC
2.5V
BANDGAP
REFERENCE
SERIAL BUS
INTERFACE
CHANNEL
MODE
REGISTER
VALUE AND
LIMIT
REGISTERS
LIMIT
COMPARATORS
INTERRUPT
STATUS
REGISTERS
INT MASK
REGISTERS
INTERRUPT
MASKING
CONFIGURATION
REGISTERS
ANALOG
OUTPUT
REGISTER AND
8-BIT DAC
CHASSIS
INTRUSION
CLEAR
REGISTER
NTEST OUT/ADD
SDA
SCL
VCC
100k
VCC
100k
CI
THERM
INT
VCC
100k
NTEST IN/AOUT
RESET
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




ADM1024 pdf, 반도체, 판매, 대치품
ADM1024
ABSOLUTE MAXIMUM RATINGS*
Positive Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . 6.5 V
Voltage on 12 V VIN Pin . . . . . . . . . . . . . . . . . . . . . . . . . 20 V
Voltage on AOUT, N TEST_OUT ADD, 2.5 VIN/D2+
. . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to (VCC + 0.3 V)
Voltage on Any Other Input or Output Pin . . –0.3 V to +6.5 V
Input Current at Any Pin . . . . . . . . . . . . . . . . . . . . . . . ± 5 mA
Package Input Current . . . . . . . . . . . . . . . . . . . . . . . . ± 20 mA
Maximum Junction Temperature (TJ max) . . . . . . . . . . 150°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature, Soldering
Vapor Phase 60 sec . . . . . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared 15 sec . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200°C
ESD Rating All Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000 V
*Stresses above those listed under Absolute Maximum Ratings may cause
permanent damage to the device. This is a stress rating only; functional operation
of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
THERMAL CHARACTERISTICS
24-Lead Small Outline Package: θJA = 50°C/W, θJC = 10°C/W.
ORDERING GUIDE
Model
Temperature
Range
ADM1024ARU 0°C to 100°C
Package
Description
Package
Option
24-Lead TSSOP RU-24
PIN CONFIGURATION
NTEST OUT/ADD 1
24 VID0/IRQ0
THERM 2
23 VID1/IRQ1
SDA 3
22 VID2/IRQ2
SCL 4
21 VID3/IRQ3
FAN1/AIN1
FAN2/AIN2
CI
5 20 VID4/IRQ4
ADM1024
6 TOP VIEW 19 +VCCP1
7 (Not to Scale) 18 +2.5VIN/D2+
GND 8
17 VCCP2/D2
VCC 9
16 +5VIN
INT 10
15 +12VIN
NTEST IN/AOUT 11
14 D1+
RESET 12
13 D1
–4– REV. 0

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ADM1024 전자부품, 판매, 대치품
ADM1024
26.5
26.0
25.5
25.0
VDD = 3.3V
24.5
24.0
23.5
23.0
22.5
40 20
0
20 40 60 80 100 120
TEMPERATURE C
Figure 8. Standby Current vs. Temperature
(continued from page 1)
configured as inputs to monitor a 2.5 V supply and a second
processor core voltage, or as a second temperature sensing input.
The remaining two inputs can be programmed as general-purpose
analog inputs or as digital fan-speed measuring inputs.
Measured values can be read out via an SMBus serial System
Management Bus, and values for limit comparisons can be
programmed in over the same serial bus. The high-speed
successive-approximation ADC allows frequent sampling of
all analog channels to ensure a fast interrupt response to any
out-of-limit measurement.
The ADM1024’s 2.8 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 protec-
tion applications in personal computers, electronic test equipment,
and office electronics.
GENERAL DESCRIPTION
The ADM1024 is a complete system hardware monitor for
microprocessor-based systems. The device communicates with
the system via a serial System Management Bus. The serial bus
controller has a hardwired address line for device selection (Pin
1), a serial data line for reading and writing addresses and data
(Pin 3), and an input line for the serial clock (Pin 4). All control
and programming functions of the ADM1024 are performed over
the serial bus.
MEASUREMENT INPUTS
Programmability of the measurement inputs makes the ADM1024
extremely flexible and versatile. The device has a 10-bit A-to-D
converter, and nine measurement input pins that can be configured
in different ways.
Pins 5 and 6 can be programmed as general-purpose analog
inputs with a range of 0 V to 2.5 V, or as digital inputs to
monitor the speed of fans with digital tachometer outputs. The
fan inputs can be programmed to accommodate fans with dif-
ferent speeds and different numbers of pulses per revolution from
their tach outputs.
Pins 13 and 14 are dedicated temperature inputs and may be
connected to the cathode and anode of an external temperature-
sensing diode.
Pins 15, 16, and 19 are dedicated analog inputs with on-chip
attenuators, configured to monitor 12 V, 5 V and the processor
core voltage, respectively.
Pins 17 and 18 may be configured as analog inputs with on-chip
attenuators to monitor a second processor core voltage and a
2.5 V supply, or they may be configured as a temperature input
and connected to a second temperature-sensing diode.
The ADC also accepts input from an on-chip bandgap tempera-
ture sensor that monitors system-ambient temperature.
Finally, the ADM1024 monitors the supply from which it is
powered, so there is no need for a separate 3.3 V analog input,
if the chip VCC is 3.3 V. The range of this VCC measurement
can be configured for either a 3.3 V or 5 V VCC by Bit 3 of the
Channel Mode Register.
SEQUENTIAL MEASUREMENT
When the ADM1024 monitoring sequence is started, it cycles
sequentially through the measurement of analog inputs and the
temperature sensor, while at the same time the fan speed inputs
are independently monitored. Measured values from these inputs
are stored in Value Registers. These can be read out over the
serial bus, or can be compared with programmed limits stored in
the Limit Registers. The results of out-of-limit comparisons are
stored in the Interrupt Status Registers, and will generate an
interrupt on the INT line (Pin 10).
Any or all of the Interrupt Status Bits can be masked by appro-
priate programming of the Interrupt Mask Register.
PROCESSOR VOLTAGE ID
Five digital inputs (VID4 to VID0—Pins 20 to 24) read the
processor voltage ID code. These inputs can also be reconfigured
as interrupt inputs.
The VID pins have internal 100 kpull-up resistors.
CHASSIS INTRUSION
A chassis intrusion input (Pin 7) is provided to detect unauthorized
tampering with the equipment.
RESET
A RESET input/output (Pin 12) is provided. Pulling this pin low
will reset all ADM1024 internal registers to default values. The
ADM1024 can also be programmed to give a low-going 45 ms
reset pulse at this pin.
The RESET pin has an internal, 100 kpull-up resistor.
ANALOG OUTPUT
The ADM1024 contains an on-chip, 8-bit digital-to-analog
converter with an output range of zero to 2.5 V (Pin 11). This is
typically used to implement a temperature-controlled fan by
controlling the speed of a fan dependent upon the temperature
measured by the on-chip temperature sensor.
Testing of board level connectivity is simplified by providing a
NAND tree test function. The AOUT (Pin 11) also doubles as
a NAND test input, while Pin 1 doubles as a NAND tree output.
INTERNAL REGISTERS OF THE ADM1024
A brief description of the ADM1024’s principal internal regis-
ters is given below. More detailed information on the function
of each register is given in Tables VI to XIX.
REV. 0
–7–

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