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PDF ADM1021A Data sheet ( Hoja de datos )
| Número de pieza | ADM1021A | |
| Descripción | System Temperature Monitor Microcomputer | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Low Cost Microprocessor,
System Temperature Monitor Microcomputer
ADM1021A
FEATURES
PRODUCT DESCRIPTION
Alternative to the ADM1021
On-chip and remote temperature sensing
No calibration necessary
1°C accuracy for on-chip sensor
3°C accuracy for remote sensor
Programmable overtemperature/undertemperature
limits
Programmable conversion rate
2-wire SMBus serial interface
Supports system management bus (SMBus) alert
200 μA max operating current
1 μA standby current
3 V to 5.5 V supply
Small 16-lead QSOP package
APPLICATIONS
Desktop computers
Notebook computers
Smart batteries
Industrial controllers
Telecom equipment
Instrumentation
The ADM1021A1 is a two-channel digital thermometer and
undertemperature/overtemperature alarm, intended for use
in personal computers and other systems requiring thermal
monitoring and management. The device can measure the
temperature of a microprocessor using a diode-connected
PNP transistor, which can be provided on-chip with the
Pentium® III or similar processors, or 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 ADM1021A communicates over a two-wire serial interface
compatible with SMBus standards. Undertemperature and
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.
FUNCTIONAL BLOCK DIAGRAM
ON-CHIP
TEMPERATURE
SENSOR
LOCAL TEMPERATURE
VALUE REGISTER
D+ 3
D– 4
ANALOG MUX
A-TO-D
CONVERTER
BUSY
RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTER
EXTERNAL DIODE OPEN-CIRCUIT
LOCAL TEMPERATURE
LOW LIMIT COMPARATOR
LOCAL TEMPERATURE
HIGH LIMIT COMPARATOR
REMOTE TEMPERATURE
LOW LIMIT COMPARATOR
REMOTE TEMPERATURE
HIGH LIMIT COMPARATOR
STATUS REGISTER
ADDRESS POINTER
REGISTER
ONE-SHOT
REGISTER
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
LOW LIMIT REGISTER
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
REMOTE TEMPERATURE
LOW LIMIT REGISTER
REMOTE TEMPERATURE
HIGH LIMIT REGISTER
CONFIGURATION
REGISTER
INTERRUPT
MASKING
15 STBY
11 ALERT
ADM1021A
SMBUS INTERFACE
125789
NC VDD NC GND GND NC
13
NC
16
NC
12
SDATA
14
SCLK
10
ADD0
6
ADD1
Figure 1.
1Protected by U.S. Patents 5,195,827; 5,867,012; 5,982,221; 6,097,239; 6,133,753; 6,169,442; other patents pending.
NC = NO CONNECT
Rev. F
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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
1 page  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
NC 1
VDD 2
D+ 3
D– 4
NC 5
ADD1 6
GND 7
GND 8
16 NC
15 STBY
ADM1021A
TOP VIEW
(Not to Scale)
14 SCLK
13 NC
12 SDATA
11 ALERT
10 ADD0
9 NC
NC = NO CONNECT
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
1, 5, 9, 13, 16
NC
2 VDD
3 D+
4 D−
6 ADD1
7, 8 GND
10 ADD0
11 ALERT
12 SDATA
14 SCLK
15 STBY
Description
No Connect.
Positive Supply, 3 V to 5.5 V.
Positive Connection to Remote Temperature Sensor.
Negative Connection to Remote Temperature Sensor.
Three-State Logic Input, Higher Bit of Device Address.
Supply 0 V Connection.
Three-State Logic Input, Lower Bit of Device Address.
Open-Drain Logic Output Used as Interrupt or SMBus Alert.
Logic Input/Output, SMBus Serial Data. Open-Drain Output.
Logic Input, SMBus Serial Clock.
Logic Input Selecting Normal Operation (High) or Standby Mode (Low).
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
ADM1021A
SCL
tLOW
tHD;STA
SDA
tBUF
PS
tR tF
tHD;DAT
tHIGH
tSU;DAT
tHD;STA
tSU;STA
S
Figure 3. Diagram for Serial Bus Timing
tSU;STO
P
Rev. F | Page 5 of 20
5 Page 
ADM1021A
Table 6. List of ADM1021A Registers
READ Address (Hex) WRITE Address (Hex)
Not applicable
Not applicable
00 Not applicable
01 Not applicable
02 Not applicable
03 09
04 0A
05 0B
06 0C
07 0D
08 0E
Not applicable
0F1
10 Not applicable
11 11
12 12
13 13
14 14
15 16
17 18
19 Not applicable
20 21
FE Not applicable
FF Not applicable
Name
Address pointer
Local temperature value
Remote temperature value
Status
Configuration
Conversion rate
Local temperature high limit
Local temperature low limit
Remote temperature high limit
Remote temperature low limit
One-shot
Reserved
Remote temperature offset
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Manufacturer device ID
Die revision code
Power-On Default
Undefined
1000 0000 (0x80) (−128°C)
1000 0000 (0x80) (−128°C)
Undefined
0000 0000 (0x00)
0000 0010 (0x02)
0111 1111 (0x7F) (+127°C)
1100 1001 (0xC9) (−55°C)
0111 1111 (0x7F) (+127°C)
1100 1001 (0xC9) (−55°C)
Reserved for future versions
0000 0000 (0°C)
Reserved for future versions
Reserved for future versions
Reserved for future versions
Reserved for future versions
Reserved for future versions
Reserved for future versions
Reserved for future versions
0100 0001 (0x41)
0011 xxxx (0x3x)
1Writing to Address 0F causes the ADM1021A to perform a single measurement. It is not a data register, and data written to it is irrelevant.
The ALERT interrupt latch is not reset by reading the status
CONVERSION RATE REGISTER
register, but is reset when the ALERT output is serviced by the
master reading the device address, provided the error condition
has gone away and the status register flag bits have been reset.
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)
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. If Bit 6 is set to 1, the device is in
standby mode and the ADC does not convert. Standby mode
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 power consumption, as shown
in Table 8.
can also be selected by taking the STBY pin low. In standby
Table 8. Conversion Rate Register Codes
mode, the values stored in the remote and local temperature
registers remain at the values they were when the part was
placed in standby.
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
Data
0x00
0x01
0x02
0x03
0x04
Conversion/Sec
0.0625
0.125
0.25
0.5
1
Average Supply Current
μA Typ at VCC = 3.3 V
150
150
150
150
150
disabled.
0x05
2
150
Table 7. Configuration Register Bit Assignments
Bit Name
Function
Power-On Default
7 MASK1
0 = ALERT enabled 0
0x06
0x07
0x08 to 0xFF
4
8
Reserved
160
180
1 = ALERT masked
6 RUN/STOP 0 = Run 1 = standby 0
5–0
Reserved
0
Rev. F | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ADM1021A.PDF ] | |
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