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ADT7490
Table 96. REGISTER 0x7C ? CONFIGURATION REGISTER 5 (POWER-ON DEFAULT = 0x01)
Bit No.
[0]
[1]
[3:2]
[4]
[5]
Mnemonic
TWOS
COMPL
Temp Offset
RES
P ECI  R 1
THERM
Output Only
R1 THERM
Output Only
R/W (Note 1)
R/W
R/W
R/W
R/W
R/W
Description
TWOS COMPL = 1 sets the temperature range to the twos complement temperature range.
TWOS COMPL = 0 changes the temperature range to the Offset 64 temperature range.
When this bit is changed, the ADT7490 interprets all relevant temperature register values as
defined by this bit.
Temp Offset = 0 sets offset range to ? 63 ? C to +64 ? C with 0.5 ? C resolution.
Temp Offset = 1 sets offset range to ? 63 ? C to +127 ? C with 1 ? C resolution.
These settings apply to Register 0x70, Register 0x71, and Register 0x72 (Remote 1, Internal,
and Remote 2 Temperature offset registers. Note that PECI offset is always 1 ? C resolution).
Reserved.
PECI R1 = 1 enables THERM assertions when the PECI temperature read is higher than the
PECI T CONTROL limit and the THERM pin is bidirectional. If THERM is configured as an
output, the THERM timer limit register (0x7A) should be set to 0xFF to avoid unwanted alerts
from being generated.
PECI R1 = 0 indicates that the THERM pin is configured as a timer input only. Can also be
disabled by writing one of the following values to the PECI T CONTROL limit register (0x3D):
Writing ? 64 ? C in Offset 64 mode.
Writing ? 128 ? C in twos complement mode.
R1 = 1 enables THERM assertions when the Remote 1 temperature read is higher than the
Remote 1 THERM limit and the THERM pin is bidirectional. If THERM is configured as an
output, the THERM timer limit (Register 0x7A) should be set to 0xFF to avoid unwanted
alerts from being generated.
R1 = 0 indicates that the THERM pin is configured as a timer input only. Can also be disabled
by writing one of the following values to the Remote 1 THERM Temp Limit register (0x6A):
Writing ? 64 ? C in Offset 64 mode.
Writing ? 128 ? C in twos complement mode.
[6]
[7]
Local
THERM
Output Only
R2 THERM
Output Only
R/W
R/W
R1 = 1 enables THERM assertions when the Local temperature read is higher than the Local
THERM limit and the THERM pin is bidirectional. If THERM is configured as an output, the
THERM timer limit (Register 0x7A) should be set to 0xFF to avoid unwanted alerts from
being generated.
R1 = 0 indicates that the THERM pin is configured as a timer input only. Can also be disabled
by writing one of the below values to the local THERM limit register (0x6B):
Writing ? 64 ? C in Offset 64 mode.
Writing ? 128 ? C in twos complement mode.
R1 = 1 enables THERM assertions when the Remote 2 temperature read is higher than the
Remote 2 THERM limit and the THERM pin is bidirectional. If THERM is configured as an
output, the THERM timer limit (Register 0x7A) should be set to 0xFF to avoid unwanted
alerts from being generated.
R1 = 0 indicates that the THERM pin is configured as a timer input only. C an also be
disabled by writing one of the below values to the Remote 2 THERM temperature limit
register (0x6C):
Writing ? 64 ? C in Offset 64 mode.
Writing ? 128 ? C in twos complement mode.
1. This register becomes read-only when the Configuration Register 1 (0x40) Lock bit is set to 1. Any further attempts to write to this register
have no effect.
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