ADM1033 Datasheet PDF - ON Semiconductor
| Part Number | ADM1033 | |
| Description | Thermal Monitor and Fan Speed (RPM) Controller | |
| Manufacturers | ON Semiconductor | |
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ADM1033
Thermal Monitor and Fan
Speed (RPM) Controller
The ADM1033 is a one channel remote- and local-temperature
sensor and fan controller. The remote channel monitors the
temperature of the remote thermal diode, which may be discrete
2N3904/6s or may be located on a microprocessor die. The device also
monitors its own ambient temperature.
The ADM1033 can monitor and control the speed of cooling fan.
The user can program a target fan speed, or else use the look-up table
to input a temperature-to-fan speed profile. The look-up table can be
configured to run the fans at discrete speeds (discrete mode) or to ramp
the fan speed with temperature (linear mode).
The ADM1033 communicates over a 2-wire SMBus 2.0 interface.
An 8-level LOCATION input allows the user to choose between
SMBus 1.1 and SMBus 2.0. An ALERT output indicates error
conditions. The THERM I/O signals overtemperature as an output and
times THERM assertions as an input. Pin 8 can be configured as a
reference for the THERM (PROCHOT) input.
Features
1 Local and Remote Temperature Channels
1C Accuracy on Local and Remote Channels
Automatic Remote Temperature Channel, Up to 1 kW
Fast (Up to 64 Measurements per Second)
SMBus 2.0, 1.1, and 1.0 Compliant
SMBus Address Input/LOCATION Input to UDID
Programmable Over/Undertemperature Limits
Programmable Fault Queue
SMBusALERT Output
Fail-Safe Overtemperature Comparator Output
Fan Speed (RPM) Controller
Look-up Table for Temperature-to-Fan Speed Control
Linear and Discrete Options for Look-up Table
FAN_FAULT Output
THERM Input, Used to Time PROCHOT Assertions
REF Input, Used as Reference for THERM (PROCHOT)
3.0 V to 5.5 V Supply
Small 16-lead QSOP Package
This is a Pb-Free Device*
Applications
Desktop and Notebook PCs
Embedded Systems
Telecommunications Equipment
LCD Projectors
* For additional information on our Pb-Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
Semiconductor Components Industries, LLC, 2012
April, 2012 − Rev. 3
1
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QSOP−16
CASE 492
PIN ASSIGNMENT
DRIVE1 1
TACH1 2
ALERT Comp 3
NC 4
GND 5
VCC 6
THERM 7
FAN_FAULT/REF 8
ADM1033
16 SCL
15 SDA
14 ALERT
13 LOCATION
12 NC
11 NC
10 D1+
9 D1−
(Top View)
MARKING DIAGRAM
1033A
RQZ
#YYWW
1033ARQZ = Specific Device Code
# = Pb-Free Package
YY = Date Code
WW = Work Week
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 34 of this data sheet.
Publication Order Number:
ADM1033/D
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ADM1033
Table 4. ELECTRICAL CHARACTERISTICS (TA = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted.) (Note 1)
Parameter
Test Conditions/Comments
Min Typ Max Unit
AGTL + INPUT (THERM)
Input High Level
− 0.75 x −
REF
V
Input Low Level
− − 0.4 V
SERIAL BUS TIMING (Note 4)
Clock Frequency, fSCLK
See Figure 2 for All Parameters
− − 400 kHz
Glitch Immunity, tSW
− 50 − ns
Bus Free Time, tBUF
1.3 −
− ms
Start Setup Time, tSU:STA
0.6 −
− ms
Start Hold Time, tHD:STA
0.6 −
− ms
Stop Condition Setup Time tSU:STO
0.6 −
− ms
SCL Low Time, tLOW
1.3 −
− ms
SCL High Time, tHIGH
0.6 −
− ms
SCL, SDA Rise Time, tr
−
−
1000
ns
SCL, SDA Fall Time, tf
− − 300 ns
Data Setup Time, tSU:DAT
100 −
− ns
Detect Clock Low Timeout, tTIMEOUT
(Note 5)
25 − 35 ms
1. Typicals are at TA = 25C and represent most likely parametric norm. Standby current typ. is measured with VCC = 3.3 V. Timing
specifications are tested at logic levels of VIL = 0.8 V for a falling edge and VIH = 2.1 V for a rising edge.
2. Operation at 5.5 V is guaranteed by design, not production tested.
3. Recommend use of 100 kW pullup resistors for all open-drain outputs from the ADM1033.
4. Guaranteed by design, not production tested.
5. SMBus timeout disabled by default. See the SMBus section for more information.
SCL
SDA
tBUF
PS
t LOW
tR
tHD; STA
tHD; DAT
tF
tHIGH
tSU; DAT
t HD; STA
tSU; STA
S
Figure 2. Serial Bus Timing Diagram
tSU; STO
P
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| Information | Total 30 Pages | |
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