ADM1022 Datasheet PDF - Analog Devices
| Part Number | ADM1022 | |
| Description | Low-Cost PC Temperature Monitor and Fan Control ASIC | |
| Manufacturers | Analog Devices | |
| Logo |  |
|
|
There is a preview and ADM1022 download ( pdf file ) link at the bottom of this page. Total 19 Pages | ||
Preview 1 page No Preview Available !
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
|
| |
 
ADM1022
Pin
No. Mnemonic
1 FAN_OFF
2 MR
3 RST1
4 GND
5 VCC
6 VMON
7 RST2
8 FAN_SPD/NTEST_IN
9 D1–
10 D1+
11 D2–/THERM
12 D2+/GPI
13 ADD/NTEST_OUT
14 INT
15 SCL
16 SDA
PIN FUNCTION DESCRIPTION
Description
Digital Output (Open-Drain) Fan Off Request. When asserted low this indicates a request to shut
off the fan independent of the FAN_SPD output. When negated (output FET off) it indicates that
the fan may be turned on.
Digital Input, Manual Reset. A logic low on this input causes RST2 to be asserted. Once this input
is negated that output will remain asserted for tRP. This input has an internal 20 kΩ pull-up resistor.
Leave unconnected if not used.
Digital I/O (Open-Drain). This pin is asserted low while VCC remains below the reset threshold. It
remains asserted for tRP after the reset condition is terminated. It is bidirectional so the ADM1022 can
be optionally reset; external logic must be used to prevent system auxiliary reset from occurring
when used as an input.
GROUND. Power and Signal Ground.
POWER 3.3 V. Power source and voltage monitor input for first reset generator.
Analog Input. Voltage monitor input for second reset generator.
Digital Output (Open-Drain). This pin is asserted low under any of the following conditions:
– VMON or VCC remains below the reset threshold
– while MR is held low
– while RST1 is asserted.
It remains asserted for tRP after the reset conditions are terminated.
Analog Output/Test Input. An active-high input that enables NAND board-level connectivity testing.
Refer to section on NAND testing. Used as an analog output for fan speed control when NAND
test is not selected.
Remote Thermal Diode Negative Input. This is the negative input (current sink) from the remote
thermal diode. This also serves as the negative input into the A/D.
Remote Thermal Diode Positive Input. This is the positive input (current source) from the remote
thermal diode. This serves as the positive input into the A/D.
Analog Input/Digital I/O (Open-Drain). Can be programmed as negative input for a second diode
temperature sensor, or as a digital I/O pin. In this case it is an active low thermal overload output
that indicates a violation of a temperature set point (over-temperature). Also acts as an input to
provide external fan control. When this pin is pulled low by an external signal, a status bit is set and
the fan speed is set to full on.
Analog/Digital Input. Can be programmed as the positive input for a second diode sensor, or as a
general-purpose logic input. In this case it can be programmed as an active high or active low input
that sets Bit 4 of the Status Registers. This bit can only be reset by reading the status registers, pro-
vided GPI is in the inactive state.
Digital I/O. The lowest order programmable bit of the SMBus Address. ADD is sampled at power-
up and changing it while powered on will have no immediate effect. This pin also functions as an
output when doing a NAND test.
Digital Output (Open Drain), System Interrupt Output. This signal indicates a violation of a set
trip point. The output is enabled when Bit 1 of the Configuration Register is set to 1. The default
state is disabled.
Digital Input SMBus Clock.
Digital I/O (Open-Drain) SMBus Bidirectional Data.
REV. 0
–5–
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for ADM1022 electronic component. |
| Information | Total 19 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ ADM1022.PDF Datasheet ] | |
Share Link :
Electronic Components Distributor
|
An electronic components distributor is a company that sources, stocks, and sells electronic components to manufacturers, engineers, and hobbyists. |
| SparkFun Electronics | Allied Electronics | DigiKey Electronics | Arrow Electronics |
| Mouser Electronics | Adafruit | Newark | Chip One Stop |
Featured Datasheets
| Part Number | Description | MFRS |
| ADM1020 | The function is 8-Lead/ Low-Cost/ System Temperature Monitor. Analog Devices | |
| ADM1021 | The function is Low Cost Microprocessor System Temperature Monitor. Analog Devices | |
| ADM1021A | The function is Low Cost Microprocessor System Temperature Monitor Microcomputer. ON Semiconductor |  |
Semiconductors commonly used in industry:
1N4148 |
BAW56 |
1N5400 |
NE555 | | ||
Quick jump to:
ADM1
1N4
2N2
2SA
2SC
74H
BC
HCF
IRF
KA | ||