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ADM1024ARUZ Datasheet(PDF) 23 Page - ON Semiconductor

Part No. ADM1024ARUZ
Description  System Hardware Monitor with Remote Diode Thermal Sensing
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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ADM1024ARUZ Datasheet(HTML) 23 Page - ON Semiconductor

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ADM1024
http://onsemi.com
23
Bits 1 and 2 of Configuration Register 2 lock the values
stored in the Local and Remote Fan Control Registers at
addresses 13h and 14h. The values in these registers cannot
be changed until a power−on reset is performed.
Bit 3 of Configuration Register 2 selects the THERM
interrupt mode. The default value of 0 selects one−time
mode. Setting this bit to 1 selects ACPI mode.
Starting Conversion
The monitoring function (analog inputs, temperature, and
fan speeds) in the ADM1024 is started by writing to
Configuration Register 1 and setting Start (Bit 0) high. The
INT_Enable (Bit 1) should be set to 1, and INT Clear (Bit 3)
set to 0 to enable interrupts. The THERMenable bit (Bit 2)
should be set to 1 and the THERM Clear bit (Bit 6) should
be set to 0 to enable temperature interrupts at the THERM
pin. Apart from initially starting together, the analog
measurements and fan speed measurements proceed
independently, and are not synchronized in any way.
The time taken to complete the analog measurements
depends on how they are configured, as described
elsewhere. The time taken to complete the fan speed
measurements depends on the fan speed and the number of
tachometer output pulses per revolution.
Once the measurements have been completed, the results
can be read from the Value Registers at any time.
Reduced Power and Shutdown Mode
The ADM1024 can be placed in a low power mode by
setting Bit 0 of the Configuration Register to 0. This disables
the internal ADC. Full shutdown mode may then be
achieved by setting Bit 0 of the Test Register to 1. This turns
off the analog output and stops the monitoring cycle, if
running, but does not affect the condition of any of the
registers. The device will return to its previous state when
this bit is reset to 0.
Application Circuit
Figure 37 shows a generic application circuit using the
ADM1024. The analog monitoring inputs are connected to
the power supplies including two processor core voltage
inputs. The VID inputs are connected to the processor
voltage ID pins. There are two tachometer inputs from fans,
and the analog output is used to control the speed of a third
fan. An opto−sensor for chassis intrusion detection is
connected to the CI input. Of course, in an actual
application, every input and output may not be used, in
which case unused analog and digital inputs should be tied
to analog or digital ground as appropriate.
Figure 37. Application Circuit
ADM1024
+
5.0 V
SCL
SDA
SERIAL BUS
VID0/IRQ0
VID1/IRQ1
VID2/IRQ2
VID3/IRQ3
VID4/IRQ4
D1+
12 V
5.0 V
5.0 V
FAN1/AIN1
FAN2/AIN2
CI
GND D
74HC132
MRD901
1N914
5.0 V
1N914
N1
N2
N3
N4
CMOS
BACKUP
BATTERY
1
2
3
4
5
6
7
14
13
12
11
10
9
8
12 V
2N2219A
OP295
NTEST_IN/AOUT
THERM
THERM I/O TO
OTHER CIRCUITS
NTEST_OUT/ADD 1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
0.1mF
10mF
VCC
VCC
RESET
INT
INT TO PROCESSOR
D1–
+VCCP1
+2.5VIN/D2+
+VCCP2/D2–
+5.0VIN
+12VIN
TRANSISTOR
SENSING
TEMP.
PROCESSOR
PINS OF
FROM VID
510kW
510kW
510kW
510kW
510kW
100kW
470kW
10kW
10kW
10kW
39kW


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