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ADM1021 Datasheet(PDF) 7 Page - Analog Devices

Part No. ADM1021
Description  Low Cost Microprocessor System Temperature Monitor
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM1021 Datasheet(HTML) 7 Page - Analog Devices

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ADM1021
–7–
REV. 0
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 ADM1021 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 is 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 com-
parator 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 II. 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.
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 ADM1021 Registers
READ Address (Hex)
WRITE Address (Hex)
Name
Power-On Default
Not Applicable
Not Applicable
Address Pointer
Undefined
00
Not Applicable
Local Temp. Value
0000 0000
(00h)
01
Not Applicable
Remote Temp. Value
0000 0000
(00h)
02
Not Applicable
Status
Undefined
03
09
Configuration
0000 0000
(00h)
04
0A
Conversion Rate
0000 0010
(02h)
05
0B
Local Temp. High Limit
0111 1111
(7Fh) (+127
°C)
06
0C
Local Temp. Low Limit
1100 1001
(C9h) (–55
°C)
07
0D
Remote Temp. High Limit
0111 1111
(7Fh) (+127
°C)
08
0E
Remote Temp. Low Limit
1100 1001
(C9h) (–55
°C)
Not Applicable
0F
1
One-Shot
10
Not Applicable
Reserved
Undefined
2
11
13
Reserved
Undefined
2
12
14
Reserved
Undefined
2
15
16
Reserved
1000 0000
2
17
18
Reserved
Undefined
2
19
Not Applicable
Reserved
0000 0000
2
20
21
Reserved
Undefined
FE
Not Applicable
Manufacturer Device ID
0100 0001
(41h)
FF
Not Applicable
Die Revision Code
Undefined
NOTES
1Writing to address 0F causes the ADM1021 to perform a single measurement. It is not a data register as such and it does not matter what data is written to it.
2These registers are reserved for future versions of the device.


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