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ADM1025 の電気的特性と機能

ADM1025のメーカーはAnalog Devicesです、この部品の機能は「Low-Cost PC Hardware Monitor ASIC」です。


製品の詳細 ( Datasheet PDF )

部品番号 ADM1025
部品説明 Low-Cost PC Hardware Monitor ASIC
メーカ Analog Devices
ロゴ Analog Devices ロゴ 




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ADM1025 Datasheet, ADM1025 PDF,ピン配置, 機能
a
Low-Cost PC
Hardware Monitor ASIC
ADM1025/ADM1025A*
FEATURES
Up to Eight Measurement Channels
Five Inputs to Measure Supply Voltages
VCC Monitored Internally
External Temperature Measurement with Remote Diode
On-Chip Temperature Sensor
Five Digital Inputs for VID Bits
Integrated 100 kPull-Ups on VID Pins (ADM1025 Only)
LDCM Support
I2C®-Compatible System Management Bus (SMBus)
Programmable RESET Output Pin
Programmable INT Output Pin
Configurable Offset for Internal/External Channel
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 ADM1025/ADM1025A is a complete system hardware
monitor for microprocessor-based systems, providing measure-
ment and limit comparison of various system parameters. Five
voltage measurement inputs are provided, for monitoring 2.5 V,
3.3 V, 5 V and 12 V power supplies and the processor core
voltage. The ADM1025/ADM1025A can monitor a sixth power
supply voltage by measuring its own VCC. One input (two pins) is
dedicated to a remote temperature-sensing diode, and an on-chip
temperature sensor allows ambient temperature to be moni-
tored. The ADM1025A has open-drain VID inputs while the
ADM1025 has on-chip 100 kpull-ups on the VID inputs.
Measured values and in/out of limit status can be read out via
an I2C-compatible serial System Management Bus. The device
can be controlled and configured over the same serial bus. The
device also has a programmable INT output to indicate under-
voltage, overvoltage and over-temperature conditions.
The ADM1025/ADM1025A’s 3.0 V to 5.5 V supply voltage
range, low supply current, and I2C-compatible 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
VID0
VID1
VID2
VID3
12VIN/VID4
VCC
VDD
VID0–3
REGISTER
100k
300kPULLUPS
VID4
REGISTER
POWER TO CHIP
SERIAL BUS
INTERFACE
ADM1025/
ADM1025A
VALUE AND
LIMIT
REGISTERS
ADD/RST/INT/NTO
SDA
SCL
VCCPIN
2.5VIN
3.3VIN
5VIN
D+
D–/NTI
BANDGAP
TEMPERATURE
SENSOR
INPUT
ATTENUATORS
AND
ANALOG
MULTIPLEXER
ADDRESS
POINTER
REGISTER
ADC
2.5V
BANDGAP
REFERENCE
LIMIT
COMPARATORS
MEASUREMENT
STATUS
REGISTERS
OFFSET
REGISTER
CONFIGURATION
REGISTER
GND
*Patent Pending.
I2C is a registered trademark of Philips Corporation.
REV. A
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





ADM1025 pdf, ピン配列
ABSOLUTE MAXIMUM RATINGS*
Positive Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . 6.5 V
Voltage on 12 V VIN Pin . . . . . . . . . . . . . . . . . . . . . . . . . 20 V
Voltage on Any 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
ADM1025/ADM1025A
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent 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
16-Lead QSOP Package:
θJA = 105°C/W
θJC = 39°C/W
Model
ADM1025ARQ
ADM1025AARQ
Temperature
Range
0°C to 100°C
0°C to 100°C
ORDERING GUIDE
Package
Description
16-Lead QSOP
16-Lead QSOP
Package
Option
RQ-16
RQ-16
Option
Integrated 100 kVID Pull-Ups
Open-Drain VID Inputs
tR
tLOW
tF
tHD:STA
SCL
tHD:STA
SDA
tBUF
PS
tHD:DAT
tHIGH
tSU:DAT
tSU:STA
S
Figure 1. Diagram for Serial Bus Timing
tHD:STO
P
REV. A
–3–


3Pages


ADM1025 電子部品, 半導体
ADM1025/ADM1025A
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
GENERAL DESCRIPTION
The ADM1025/ADM1025A is a complete system hardware
monitor for microprocessor-based systems. The device commu-
nicates with the system via a serial System Management Bus.
The serial bus controller has a hardwired address line for device
selection (Pin 16), a serial data line for reading and writing
addresses and data (Pin 1), and an input line for the serial clock
(Pin 2). All control and programming functions of the ADM1025/
ADM1025A are performed over the serial bus.
MEASUREMENT INPUTS
The device has six measurement inputs, five for voltage and one
for temperature. It can also measure its own supply voltage and
can measure ambient temperature with its on-chip temperature
sensor.
Pins 11 through 15 are analog inputs with on-chip attenuators,
configured to monitor 12 V, 5 V, 3.3 V, 2.5 V and the processor
core voltage, respectively. Pin 11 may alternatively be programmed
as a digital input for Bit 4 of the processor voltage ID code.
Power is supplied to the chip via Pin 4 and the system also
monitors the voltage on this pin.
Remote temperature sensing is provided by the D+ and D–
inputs, to which a diode-connected, external temperature-
sensing transistor may be connected.
An on-chip bandgap temperature sensor monitors system ambi-
ent temperature.
SEQUENTIAL MEASUREMENT
When the ADM1025/ADM1025A monitoring sequence is started,
it cycles sequentially through the measurement of analog inputs
and the temperature sensors. 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 Status Registers, which can be read over the
serial bus to flag out of limit conditions.
PROCESSOR VOLTAGE ID
Five digital inputs (VID4 to VID0—Pins 5 to 8 and 11) read the
processor voltage ID code and store it in the VID registers, from
which it can be read out by the management system over the
serial bus. If Pin 11 is configured as a 12 V analog input (power-
up default), the VID4 bit in the VID4 register will default to 0.
The VID pins have internal 100 kpull-up resistors (ADM1025
only).
ADD/RST/INT/NTO
Pin 16 is a programmable digital I/O pin. After power-up, at the
first sign of SMBus activity, it is sampled to set the lowest two
bits of the serial bus address. During board-level, NAND tree
connectivity testing, this pin functions as the output of the NAND
tree. During normal operation Pin 16 may be programmed as a
reset output to provide a low going 20 ms reset pulse when
enabled, or it may be programmed as an interrupt output for
out-of-limit temperature and/or voltage events. These functions
are described in more detail later.
INTERNAL REGISTERS OF THE ADM1025/ADM1025A
A brief description of the ADM1025/ADM1025A’s principal
internal registers is given below. More detailed information on
the function of each register is given in Tables V to XV.
Configuration Register: Provides control and configuration.
Address Pointer Register: This register contains the address that
selects one of the other internal registers. When writing to the
ADM1025/ADM1025A, the first byte of data is always a register
address, which is written to the Address Pointer Register.
Status Registers: Two registers to provide status of each limit
comparison.
VID Registers: The status of the VID0 to VID4 pins of the
processor can read from these registers.
Value and Limit Registers: The results of analog voltage
inputs and temperature measurements are stored in these regis-
ters, along with their limit values.
Offset Register: Allows either an internal or external tempera-
ture channel reading to be offset by a two’s complement value
written to this register.
SERIAL BUS INTERFACE
Control of the ADM1025/ADM1025A is carried out via the
serial bus. The ADM1025/ADM1025A is connected to this
bus as a slave device, under the control of a master device or
master controller.
The ADM1025/ADM1025A has a 7-bit serial bus address. When
the device is powered up, it will do so with a default serial bus
address. The five MSBs of the address are set to 01011, the two
LSBs are determined by the logical states of Pin 16 at power-up.
This is a three-state input that can be grounded, connected to
VCC or left open-circuit to give three different addresses:
Table I. Address Selection
ADD Pin
GND
No Connect
VCC
A1
0
1
0
A0
0
0
1
–6– REV. A

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