ADT7482
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12
Table 14. SAMPLE OFFSET REGISTER CODES
Offset Value
0x11/0x34
0x12/0x35
128癈
1000 0000
00 00 0000
4癈
1111 1100
00 00 0000
1癈
1111 1111
00 000000
0.25癈
1111 1111
10 00 0000
0癈
0000 0000
00 00 0000
+0.25癈
0000 0000
01 00 0000
+1癈
0000 0001
00 00 0000
+4癈
0000 0100
00 00 0000
+127.75癈
0111 1111
11 00 0000
One-shot Register
The one-shot register initiates a conversion and
comparison cycle when the ADT7482 is in standby mode,
after which the device returns to standby. Writing to the
one-shot register address (0x0F) causes the ADT7482 to
perform a conversion and comparison on both the local and
the remote temperature channels. This is not a data register
as such, and it is the write operation to Address 0x0F that
causes the one-shot conversion. The data written to this
address is irrelevant and is not stored.
Consecutive ALERT
Register
The value written to this register determines how many
out-of-limit measurements must occur before an ALERT
is
generated. The default value is that one out-of-limit
measurement generates an ALERT
. The maximum value
that can be chosen is 4. This register allows some filtering
of the output. This is particularly useful at the fastest three
conversion rates, where no averaging takes place. This
register address is 0x22. For more information, refer to
Table 15.
Table 15. CONSECUTIVE ALERT
REGISTER BIT
Register Value
Amount of Out-of-Limit
Measurements Required
yza?000x
1
yza?001x
2
yza?011x
3
yza?111x
4
NOTES: y = SMBus SCL timeout bit. Default = 0. See the Serial
Bus Interface section for more information.
z = SMBus SDA timeout bit. Default = 0. See the Serial
Bus Interface section for more information.
a = Mask Internal ALERT
s.
x = Dont care bit.
Table 16. LIST OF REGISTERS
Read
Address
(Hex)
Write
Address
(Hex)
Mnemonic
Power-On Default
Comment
Lock
N/A
N/A
Address Pointer
Undefined
No
00
N/A
Local Temperature Value
0000 0000 (0x00)
No
01
N/A
Remote 1 Temperature Value High Byte
0000 0000 (0x00)
Bit 3 Conf. Reg. = 0
No
01
N/A
Remote 2 Temperature Value High Byte
0000 0000 (0x00)
Bit 3 Conf. Reg. = 1
No
02
N/A
Status Register 1
Undefined
No
03
09
Configuration Register 1
0000 0000 (0x00)
Yes
04
0A
Conversion Rate
0000 0111 (0x07)
Yes
05
0B
Local Temperature High Limit
0101 0101 (0x55) (85癈)
Yes
06
0C
Local Temperature Low Limit
0000 0000 (0x00) (0癈)
Yes
07
0D
Remote 1 Temperature High Limit High Byte
0101 0101 (0x55) (85癈)
Bit 3 Conf. Reg. = 0
Yes
07
0D
Remote 2 Temperature High Limit High Byte
0101 0101 (0x55) (85癈)
Bit 3 Conf. Reg. = 1
Yes
08
0E
Remote 1 Temperature Low Limit High Byte
0000 0000 (0x00) (0癈)
Bit 3 Conf. Reg. = 0
Yes
08
0E
Remote 2 Temperature Low Limit High Byte
0000 0000 (0x00) (0癈)
Bit 3 Conf. Reg. = 1
Yes
N/A
0F
(Note 1)
One Shot
N/A
10
N/A
Remote 1 Temperature Value Low Byte
0000 0000
Bit 3 Conf. Reg. = 0
No
10
N/A
Remote 2 Temperature Value Low Byte
0000 0000
Bit 3 Conf. Reg. = 1
No
11
11
Remote 1 Temperature Offset High Byte
0000 0000
Bit 3 Conf. Reg. = 0
Yes
11
11
Remote 2 Temperature Offset High Byte
0000 0000
Bit 3 Conf. Reg. = 1
Yes
12
12
Remote 1 Temperature Offset Low Byte
0000 0000
Bit 3 Conf. Reg. = 0
Yes
12
12
Remote 2 Temperature Offset Low Byte
0000 0000
Bit 3 Conf. Reg. = 1
Yes
13
13
Remote 1 Temperature High Limit Low Byte
0000 0000
Bit 3 Conf. Reg. = 0
Yes
13
13
Remote 2 Temperature High Limit Low Byte
0000 0000
Bit 3 Conf. Reg. = 1
Yes
14
14
Remote 1 Temperature Low Limit Low Byte
0000 0000
Bit 3 Conf. Reg. = 0
Yes
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