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PDF ADM1023 Data sheet ( Hoja de datos )
| Número de pieza | ADM1023 | |
| Descripción | High Accuracy Microprocessor System Temperature Monitor | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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ADM1023
ACPI‐Compliant, High
Accuracy Microprocessor
System Temperature Monitor
The ADM1023 is a 2-channel digital thermometer and
under/overtemperature alarm for use in personal computers and other
systems requiring thermal monitoring and management. Optimized
for the Pentium III, the higher accuracy allows systems designers to
safely reduce temperature guard banding and increase system
performance. The device can measure the temperature of a
microprocessor using a diode-connected PNP transistor, which may be
provided on-chip with the Pentium III or similar processors; or it can
be a low-cost, discrete NPN/PNP device such as the 2N3904/2N3906.
A novel measurement technique cancels out the absolute value of the
transistor’s base emitter voltage so that no calibration is required. The
second measurement channel measures the output of an on-chip
temperature sensor to monitor the temperature of the device and its
environment.
The ADM1023 communicates over a 2-wire serial interface
compatible with SMBus standards. Under/overtemperature limits can
be programmed into the device over the serial bus, and an ALERT
output signals when the on-chip or remote temperature is out of range.
This output can be used as an interrupt or as an SMBus ALERT.
Features
Next Generation Upgrade of ADM1021
On-Chip and Remote Temperature Sensing
Offset Registers for System Calibration
1C Accuracy and Resolution on Local Channel
0.125C Resolution/1C Accuracy on Remote Channel
Programmable Over/Undertemperature Limits
Programmable Conversion Rate
Supports System Management Bus (SMBus) ALERT
2-Wire SMBus Serial Interface
200 mA Max Operating Current (0.25 Conversions/Second)
1 mA Standby Current
3.0 V to 5.5 V Supply
Small 16-Lead QSOP Package
This is a Pb-Free Package*
Applications
Desktop Computers
Notebook Computers
Smart Batteries
Industrial Controllers
Telecomm Equipment
Instrumentation
*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. 10
1
http://onsemi.com
QSOP 16
CASE 492
PIN ASSIGNMENT
NC 1
VDD 2
D+ 3
D− 4
NC 5
ADD1 6
GND 7
GND 8
16 NC
15 STBY
14 SCLK
13 NC
12 SDATA
11 ALERT
10 ADD0
9 NC
ADM1023
(Top View)
MARKING DIAGRAM
1023A
RQZ
YYWWG
1023ARQZ
YY
WW
G
= Specific Device Code
= Year
= Work Week
= Pb-Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
Publication Order Number:
ADM1023/D
1 page  
ADM1023
TYPICAL PERFORMANCE CHARACTERISTICS
20
15
10
5
0
–5
–10
–15
–20
–25
–30
1
D+ TO GND
D+ TO VDD
10
LEAKAGE RESISTANCE (M)
100
Figure 3. Temperature Error vs. Resistance from
Track to VDD and GND
9
100mV p−p
8
7
6
5
4
3
50mV p−p
2
1
25mV p−p
0
1 10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 5. Temperature Error vs. Common-mode
Noise Frequency
5
4
250mV p−p REMOTE
3
2
100mV p−p REMOTE
1
0
100
1k
10k 100k
1M
10M
100M
FREQUENCY (Hz)
Figure 4. Remote Temperature Error vs. Supply
Noise Frequency
3
2
UPPER SPEC LEVEL
1
0
–1 LOWER SPEC LEVEL
–2
–3
50 60 70 80 90 100 110 120
TEMPERATURE (5C)
Figure 6. Temperature Error of ADM1023 vs.
Pentium III Temperature
14
12
10
8
6
4
2
0
–2
2 4 6 8 10 12 14 16 18 20 22 24
CAPACITANCE (nF)
Figure 7. Temperature Error vs. Capacitance
Between D+ and D−
70
60
50
40
VDD = 3.3V
30
20
10
VDD = 5V
0
1 5 10 25 50 75 100 250 500 750 1000
SCLK FREQUENCY (kHz)
Figure 8. Standby Supply Current vs.
SCLK Frequency
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5 Page 
ADM1023
Table 9. STATUS REGISTER BIT ASSIGNMENTS
Bit Name
Function
7 BUSY At 1 when ADC converting
6 LHIGH* At 1 when local high temp limit tripped
5 LLOW* At 1 when local low temp limit tripped
4 RHIGH* At 1 when remote high temp limit tripped
3 RLOW* At 1 when remote low temp limit tripped
2 OPEN* At 1 when remote sensor open-circuit
1 to 0
Reserved
*These flags stay high until the status register is read or they are
reset by POR.
Configuration Register
Two bits of the configuration register are used. If Bit 6 is 0,
which is the power-on default, the device is in operating
mode with the ADC converting (see Table 10). If Bit 6 is set
to 1, the device is in standby mode and the ADC does not
convert. Standby mode can also be selected by taking the
STBY pin low. In standby mode, the values of remote and
local temperature remain at the value they were before the
part was placed in standby mode.
Bit 7 of the configuration register is used to mask the
ALERT output. If Bit 7 is 0, which is the power-on default,
the ALERT output is enabled. If Bit 7 is set to 1, the ALERT
output is disabled.
Table 10. CONFIGURATION REGISTER BIT
ASSIGNMENTS
Bit Name
Function
Power-on
Default
7
6
5 to 0
MASK1
RUN/STOP
0 = ALERT Enabled
1 = ALERT Masked
0 = Run
1 = Standby
Reserved
0
0
0
Conversion Rate Register
The lowest three bits of this register are used to program
the conversion rate by dividing the ADC clock by 1, 2, 4, 8,
16, 32, 64, or 128, to give conversion times from 125 ms
(Code 0x07) to 16 seconds (Code 0x00). This register can be
written to and read back over the SMBus. The higher five
bits of this register are unused and must be set to 0. Use of
slower conversion times greatly reduces the device’s power
consumption, as shown in Table 11.
Table 11. CONVERSION RATE REGISTER CODE
Data
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08 to
0xFF
Conversion/Sec
0.0625
0.125
0.25
0.5
1
2
4
8
Reserved
Average Supply Current
mA Typ at VCC = 3.3 V
150
150
150
150
150
150
160
180
Limit Registers
The ADM1023 has six limit registers to store local and
remote, high and low temperature limits. These registers can
be written to and read back over the SMBus. The high limit
registers perform a > comparison, while the low limit
registers perform a < comparison. For example, if the high
limit register is programmed as a limit of 80C, measuring
81C results in an alarm condition. Even though the
temperature range is 0 to 127C, it is possible to program the
limit register with negative values. This is for
backward-compatibility with the ADM1021.
One−Shot Register
The one-shot register is used to initiate a single conversion
and comparison cycle when the ADM1023 is in standby
mode, after which the device returns to standby. This is not
a data register as such, and it is the write operation that
causes the one-shot conversion. The data written to this
address is irrelevant and is not stored.
Serial Bus Interface
Control of the ADM1023 is carried out via the serial bus.
The ADM1023 is connected to this bus as a slave device,
under the control of a master device. Note that the SMBus
SDA and SCLK pins are three-stated when the ADM1023
is powered down, and they do not pull down the SMBus.
Address Pins
In general, every SMBus device has a 7-bit device address
(except for some devices that have extended, 10-bit
addresses). When the master device sends a device address
over the bus, the slave device with that address responds.
The ADM1023 has two address pins, ADD0 and ADD1, to
allow selection of the device address, so that several
ADM1023s can be used on the same bus and to avoid
conflict with other devices. Although only two address pins
are provided, these pins are three-state and can be grounded,
left unconnected, or tied to VDD, so that a total of nine
different addresses are possible, as shown in Table 12.
Note that the state of the address pins is sampled only at
powerup, so changing them after powerup has no effect.
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADM1023.PDF ] | |
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