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ADM1023ARQ Datasheet(PDF) 8 Page - Analog Devices

No. de pieza ADM1023ARQ
Descripción Electrónicos  ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor
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ADM1023ARQ Datasheet(HTML) 8 Page - Analog Devices

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ADM1023
–8–
REV. A
Table IV.
Remote
Remote
Temperature Temperature
Offset Registers
Offset
(Including
(Without
11h
12h
Value
Offset)
Offset)
1111 1100 0000 0000
–4
°C14°C18°C
1111 1111 0000 0000
–1
°C17°C18°C
1111 1111 1110 0000
–0.125
°C 17.875°C18°C
0000 0000 0000 0000
0
°C18°C18°C
0000 0000 0010 0000
+0.125
°C 18.125°C18°C
0000 0001 0000 0000
+1
°C19°C18°C
0000 0100 0000 0000
+4
°C22°C18°C
Status Register
Bit 7 of the Status Register indicates that the ADC is busy con-
verting when it is high. Bits 6 to 3 are flags that indicate the
results of the limit comparisons.
If the local and/or remote temperature measurement is above
the corresponding high temperature limit, or below the corre-
sponding low temperature limit, one or more of these flags will be
set. Bit 2 is a flag that is set if the remote temperature sensor
is open-circuit. These five flags are NOR’d together, so that if
any of them are high, the
ALERT interrupt latch will be set and
the
ALERT output will go low. Reading the Status Register will
clear the five flag bits, provided the error conditions that caused
the flags to be set have gone away. While a limit comparator
is tripped due to a value register containing an out-of-limit
measurement, or the sensor is open-circuit, the corresponding
flag bit cannot be reset. A flag bit can only be reset if the corre-
sponding value register contains an in-limit measurement, or the
sensor is good.
The
ALERT interrupt latch is not reset by reading the Status
Register, but will be reset when the
ALERT output has been
serviced by the master reading the device address, provided the
error condition has gone away and the Status Register flag bits
have been reset.
Table V. Status Register Bit Assignments
Bit
Name
Function
7
BUSY
1 When ADC Converting.
6
LHIGH
*
1 When Local High Temp Limit Tripped.
5
LLOW
*
1 When Local Low Temp Limit Tripped.
4
RHIGH
*
1 When Remote High Temp Limit Tripped.
3
RLOW
*
1 When Remote Low Temp Limit Tripped.
2
OPEN
*
1 When Remote Sensor Open-Circuit.
1–0
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. 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.
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 III. List of ADM1023 Registers
READ Address (Hex)
WRITE Address (Hex)
Name
Power-On Default
Not Applicable
Not Applicable
Address Pointer
Undefined
00
Not Applicable
Local Temperature Value
1000 0000 (80h) (–128
°C)
01
Not Applicable
Remote Temperature Value High Byte
1000 0000 (80h) (–128
°C)
02
Not Applicable
Status
Undefined
03
09
Configuration
0000 0000 (00h)
04
0A
Conversion Rate
0000 0010 (02h)
05
0B
Local Temperature High Limit
0111 1111 (7Fh) (+127
°C)
06
0C
Local Temperature Low Limit
1100 1001 (C9h) (–55
°C)
07
0D
Remote Temperature High Limit High Byte
0111 1111 (7Fh) (+127
°C)
08
0E
Remote Temperature Low Limit High Byte
1100 1001 (C9h) (–55
°C)
Not Applicable
0F
1
One-Shot
10
Not Applicable
Remote Temperature Value Low Byte
0000 0000
11
11
Remote Temperature Offset High Byte
0000 0000
12
12
Remote Temperature Offset Low Byte
0000 0000
13
13
Remote Temperature High Limit Low Byte
0000 0000
14
14
Remote Temperature Low Limit Low Byte
0000 0000
19
Not Applicable
Reserved
0000 0000
20
21
Reserved
Undefined
FE
Not Applicable
Manufacturer Device ID
0100 0001 (41h)
FF
Not Applicable
Die Revision Code
0011 xxxx (3xh)
NOTE
1Writing to address 0F causes the ADM1023 to perform a single measurement. It is not a data register as such and it does not matter what data is written to it.


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