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ADM1022ARQ-REEL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
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.
a
ADM1022
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
Low-Cost PC Temperature
Monitor and Fan Control ASIC
FUNCTIONAL BLOCK DIAGRAM
2.5V
BANDGAP
REFERENCE
ADDRESS
POINTER
REGISTER
ADC
RESET
GENERATOR 1
ANALOG
MULTIPLEXER
ADM1022
RST1
RST2
D1+
D1–
D2+/GPI
D2–/THERM
GND
SDA
SCL
ADD/NTEST_OUT
MR
V
CC
20k⍀
V
CC
V
MON
FAN_SPD/NTEST_IN
INT
FAN_OFF
LIMIT
COMPARATORS
INTERRUPT
STATUS
REGISTERS
MASK
GATING
CONFIGURATION
REGISTER
SERIAL BUS
INTERFACE
INT MASK
REGISTER
ANALOG
OUTPUT
REGISTER
AND 8-BIT DAC
VALUE AND
LIMIT
REGISTERS
RESET
GENERATOR 2
BANDGAP
TEMPERATURE
SENSOR
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.
REV. 0
–2–
ADM1022–SPECIFICATIONS
Parameter Min Typ
1
Max Unit Test Conditions
POWER SUPPLY
Supply Voltage, V
CC
3.0 3.30 5.5 V
Supply Current, I
CC
1.4 2.6 mA Interface Inactive, ADC Active
TEMPERATURE-TO-DIGITAL CONVERTER
Internal Sensor Accuracy ± 3 °C
± 1 ± 2 °CT
A
= 85°C, Tested at Wafer Sort
Resolution 1 °C
External Diode Sensor Accuracy ± 5 °C
± 3 °CT
A
= 85°C, Tested at Wafer Sort
Resolution 1 °C
Remote Sensor Source Current 60 90 130 µA High Level (D+ = D– +0.65 V)
3.5 5.5 7.5 µA Low Level (D+ = D– +0.65 V)
Total Monitoring Cycle Time, t
C
200 ms
ANALOG OUTPUT
Output Voltage Range 0 2.5 V
Total Unadjusted Error, TUE ± 5% I
L
= 2 mA
Full-Scale Error ± 1 ± 3%
Zero Error ± 2 LSB No Load
Differential Nonlinearity, DNL ± 1 LSB Monotonic by Design
Integral Nonlinearity ± 1 LSB
Output Source Current 2 mA
Output Sink Current 1 mA
VOLTAGE MONITOR THRESHOLDS
Reset Threshold, V
MON
, V
CC
2.85 2.925 3.00 V Measured with V
CC
Falling
Hysteresis 50 mV
MR INPUT
MR Minimum Pulsewidth, t
MR
10 µs
MR Glitch Immunity 100 ns
MR to RST2 Propagation Delay, t
MD
0.5 µs
MR Pull-Up Resistance 10 20 30 kΩ
RESET OUTPUTS, RST1, RST2
Reset Output Voltage, V
OL
0.3 V I
SINK
= 1.2 mA
V
CC
= V
TH
(MAX)
Reset Active Timeout Period, t
RP
140 180 560 ms
V
CC
to Reset Delay, t
D
20 µs
DIGITAL OUTPUT ADD/NTEST_OUT
2
Output High Voltage, V
OH
2.4 V I
OUT
= 3.0 mA
Output Low Voltage, V
OL
0.4 V
OPEN-DRAIN DIGITAL OUTPUTS
(INT, THERM, RST2, RST1)
Output Low Voltage, V
OL
0.4 V I
OUT
= –3.0 mA
High Level Output Leakage Current, I
OH
0.1 1 µAV
OUT
= V
CC
OPEN-DRAIN SERIAL DATA
BUS OUTPUT (SDA)
Output Low Voltage, V
OL
0.4 V I
OUT
= –3.0 mA
High Level Output Leakage Current, I
OH
0.1 1 µAV
OUT
= V
CC
SERIAL BUS DIGITAL INPUTS
(SCL, SDA)
Input High Voltage, V
IH
2.1 V (min)
Input Low Voltage, V
IL
0.8 V (max)
Input Leakage Current ± 5 µA
Hysteresis 500 mV
(T
A
= T
MIN
to T
MAX
, V
CC
= V
MIN
to V
MAX
, unless otherwise noted.)
REV. 0 –3–
ADM1022
Parameter Min Typ Max Unit Test Conditions
DIGITAL INPUT LOGIC LEVELS
(FAN_SPD/NTEST_IN,
ADD/NTEST_OUT, MR, GPI)
Input High Voltage, V
IH
2.2 V
Input Low Voltage, V
IL
0.8 V
DIGITAL INPUT LEAKAGE CURRENT
(ALL DIGITAL INPUTS)
Input High Current, I
IH
–1 –0.005 µAV
IN
= V
CC
Input Low Current, I
IL
+0.005 +1 µAV
IN
= 0
Input Capacitance, C
IN
5pF
SERIAL BUS TIMING
3
Clock Frequency, f
SCLK
400 kHz See Figure 1
Glitch Immunity, t
SW
50 ns See Figure 1
Bus Free Time, t
BUF
1.3 µs See Figure 1
Start Setup Time, t
SU:STA
600 ns See Figure 1
Start Hold Time, t
HD:STA
600 ns See Figure 1
Stop Condition Setup Time, t
SU:STO
600 ns See Figure 1
SCL Low Time, t
LOW
1.3 µs See Figure 1
SCL High Time, t
HIGH
0.6 µs See Figure 1
SCL, SDA Rise Time, t
R
300 ns See Figure 1
SCL, SDA Fall Time, t
F
300 ns See Figure 1
Data Setup Time, t
SU:DAT
100 ns See Figure 1
Data Hold Time, t
HD:DAT
300 ns See Figure 1
NOTES
1
Typicals are at T
A
= 25°C and represent most likely parametric norm. Standby current typ is measured with V
CC
= 3.3 V.
2
ADD is a three-state input that may be pulled high, low or left open-circuit.
3
Timing specifications are tested at logic levels of V
IL
= 0.8 V for a falling edge and V
IH
= 2.2 V for a rising edge.
Specifications subject to change without notice.
PS
P
t
HD;STA
t
SU;STA
t
SU;DAT
t
HIGH
t
F
t
HD;DAT
t
R
t
LOW
t
HD;STA
t
BUF
S
SCL
SDA
t
SU;STO
Figure 1. Diagram for Serial Bus Timing
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

ADM1022ARQ-REEL

Mfr. #:
Buy ADM1022ARQ-REEL
Manufacturer:
ON Semiconductor
Description:
IC SENSOR TEMP/DET 3/5.5V 16QSOP
Lifecycle:
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