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ADM1021A
–7–
REV. D
Table III. List of ADM1021A Registers
READ Address (Hex)
WRITE Address (Hex)
Name
Power-On Default
Not Applicable
Not Applicable
Address Pointer
Undefined
00
Not Applicable
Local Temp. Value
1000 0000 (80h) (–128
°C)
01
Not Applicable
Remote Temp. Value
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 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
11
Reserved
Undefined
2
12
12
Reserved
Undefined
2
13
13
Reserved
Undefined
2
14
14
Reserved
Undefined
2
15
16
Reserved
Undefined
2
17
18
Reserved
Undefined
2
19
Not Applicable
Reserved
Undefined
2
20
21
Reserved
Undefined
2
FE
Not Applicable
Manufacturer Device ID
0100 0001 (41h)
FF
Not Applicable
Die Revision Code
0011 xxxx
(3xh)
NOTES
1Writing to address 0F causes the ADM1021A 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.
Table I. Temperature Data Format
Temperature
Digital Output
0
°C0 000 0000
1
°C0 000 0001
10
°C0 000 1010
25
°C0 001 1001
50
°C0 011 0010
75
°C0 100 1011
100
°C0 110 0100
125
°C0 111 1101
127
°C0 111 1111
REGISTERS
The ADM1021A contains nine registers that are used to store
the results of remote and local temperature measurements,
high and low temperature limits, and to configure and control
the device. A description of these registers follows, and further
details are given in Tables II to IV. It should be noted that the
ADM1021A’s registers are dual port, and have different addresses
for read and write operations. Attempting to write to a read address,
or to read from a write address, will produce an invalid result.
Register addresses above 0Fh are reserved for future use or used
for factory test purposes and should not be written to.
Address Pointer Register
The Address Pointer Register itself does not have, nor does it
require, an address, as it is the register to which the first data
byte of every write operation is written automatically. This data
byte is an address pointer that sets up one of the other registers
for the second byte of the write operation, or for a subsequent
read operation.
Value Registers
The ADM1021A 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 when it is high that the
ADC is busy converting. 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 corresponding
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 comparator is tripped due to a
value register containing an out-of-limit measurement, or the sen-
sor is open-circuit, the corresponding flag bit cannot be reset. A
flag bit can only be reset if the corresponding value register con-
tains an in-limit measurement, or the sensor is good.
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.


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