Semiconductor Components Industries, LLC, 2012
April, 2012 − Rev. 2
1 Publication Order Number:
ADM1029/D
ADM1029
Dual PWM Fan Controller
and Temperature Monitor for
High Availability Systems
The ADM1029 is a versatile fan controller and monitor for use in
personal computers, servers, telecommunications equipment, or any
high-availability system where reliable control and monitoring of
multiple cooling fans is required. Each ADM1029 can control the
speed of one or two fans and can measure the speed of fans that have a
tachometer output. The ADM1029 can also measure the temperature
of one or two external sensing diodes or an internal temperature
sensor, allowing fan speed to be adjusted to keep system temperature
within acceptable limits. The ADM1029 has FAULT inputs for use
with fans that can signal failure conditions, and inputs to detect
whether or not fans are connected.
The ADM1029 communicates with the host processor over an
System Management (SMBus) serial bus. It supports eight different
serial bus addresses, so that up to eight devices can be connected to a
common bus, controlling up to sixteen fans. This makes software
support and hardware design scalable.
The ADM1029 has an interrupt output (INT
) that allows it to signal
fault conditions to the host processor. It also has a separate, cascadable
fault output (CFAULT
) that allows the ADM1029 to signal a fault
condition to other ADM1029s.
The ADM1029 has a number of useful features including an
automatic fan speed control option implemented in hardware with no
software requirement, automatic use of backup fans in the event of fan
failure, and supports hot-swapping of failed fans.
Features
Software Programmable and Automatic Fan Speed Control
Automatic Fan Speed Control Allows Control
Independent of CPU Intervention after Initial Setup
Control Loop Minimizes Acoustic Noise and Power Consumption
Remote and Local Temperature Monitoring
Dual Fan Speed Measurement
Supports Backup and Redundant Fans
Supports Hot Swapping of Fans
Cascadable Fault Output Allows Fault Signaling between Multiple
ADM1029s
Address Pin Allows Up to Eight ADM1029s in A System
Small 24-lead QSOP Package
This is a Pb-Free Device*
Applications
Network Servers and Personal Computers
Microprocessor-based Office Equipment
High Availability Telecommunications Equipment
* For additional information on our Pb-Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 49 of this data sheet.
ORDERING INFORMATION
1029ARQZ = Special Device Code
# = Pb-Free Package
YYWW = Date Code
MARKING DIAGRAM
QSOP 24
CASE 492B
1029ARQZ
#YYWW
ADM1029
Top View
(Not To Scale)
DRIVE2
FAULT2
TACH2
AIN1/GPIO1
PRESENT2
AIN0/GPIO0
TMIN/INSTALL
D2+/GPIO6
D2−/GPIO5
ADD
D1+/GPIO4
D1−/GPIO3
DRIVE1
FAULT1
TACH1
PRESENT1
SCL
SDA
GND
V
CC
CFAULT
INT
GPIO2
RESET
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
PIN ASSIGNMENT
