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參數資料
| 型號： | ADM1020AR-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | 8-Lead, Low-Cost, System Temperature Monitor |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數： | 7/12頁 |
| 文件大小： | 132K |
| 代理商： | ADM1020AR-REEL7 |
REV. 0
ADM1020
–7–
The power-on default value of the Address Pointer Register is
00h, so if a read operation is performed immediately after power-
on, without first writing to the address pointer, the value of the
local temperature will be returned, since its register address is
00h.
Value Registers
The ADM1020 has two registers to store the results of local and
remote temperature measurements. These registers are written
to by the ADC and can only be read over the SMBus.
Status Register
Bit 7 of the Status Register indicates that the ADC is busy con-
verting when it is high. Bits 5 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, then 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 condi-
tions 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 corresponding 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 II. Status Register Bit Assignments
Bit
Name
Function
7
6
5
4
3
2
1–0
BUSY
LHIGH*
LLOW*
RHIGH*
RLOW*
OPEN*
1 When ADC Converting
1 When Local High-Temp Limit Tripped
1 When Local Low-Temp Limit Tripped
1 When Remote High-Temp Limit Tripped
1 When Remote Low-Temp Limit Tripped
1 When Remote Sensor Open-Circuit
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.
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 Registers
Read Address (Hex)
Write Address (Hex)
Name
Power-On Default
Not Applicable
00
01
02
03
04
05
06
07
08
Not Applicable
10
11
12
15
17
19
20
FE
FF
Not Applicable
Not Applicable
Not Applicable
Not Applicable
09
0A
0B
0C
0D
0E
0F
Not Applicable
13
14
16
18
Not Applicable
21
Not Applicable
Not Applicable
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
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Manufacturer ID
Die Revision Code
Undefined
0000 0000 (00h)
0000 0000 (00h)
Undefined
0000 0000 (00h)
0000 0010 (02h)
0111 1111 (7Fh) (127
°
C)
1100 1001 (C9h) (–55
°
C)
0111 1111 (7Fh) (127
°
C)
1100 1001 (C9h) (–55
°
C)
See Note 1
Undefined (Note 2)
Undefined (Note 2)
Undefined (Note 2)
1000 0000 (Note 2)
Undefined (Note 2)
0000 0000 (Note 2)
Undefined
0100 0001 (41h)
Undefined
NOTES
1
Writing to address 0F causes the ADM1020 to perform a single measurement. It is not a data register as such and it does not matter what data is written to it.
2
These registers are reserved for future versions of the device.
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