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ADT7490
Table 14. PECI ERROR INDICATORS
PECI
Table 16. REPLACE MODE TEMPERATURE
REGISTERS
Data
Description
Action
Remote 1
0x8000 to
0x8003
Invalid
FCS
PECI Data Error
PECI Communications Error
Bit 1 of Register
0x43 is set to 1
Bit 2 of Register
0x43 is set to 1
Register Name
Value Register
Low Limit
High Limit
Default
Reg. 0x25
Reg. 0x4E
Reg. 0x4F
PECI0 Default
Reg. 0x33
Reg. 0x34
Reg. 0x35
Each PECI channel also has an associated status bit to
indicate if the PECI high or low limits have been exceeded.
An alert is generated on the SMBALERT pin when these
status bits are asserted.
T MIN
T RANGE
Enhanced Acoustics
Reg. 0x67
Reg. 0x5F,
Bits [7:4]
Reg. 0x62,
Bits [2:0]
Reg. 0x3B
Reg. 0x3C,
Bits [7:4]
Reg. 0x3C,
Bits [2:0]
Table 15. PECI STATUS BITS
Channel Register
PECI0 0x43
PECI1 0x81
PECI2 0x81
PECI3 0x81
Bit
0
3
4
5
Enhanced Acoustics
Enable
THERM T CONTROL
T MIN Hysteresis
Reg. 0x62, Bit 3
Reg. 0x6A
Reg. 0x6D,
Bits [7:4]
Reg. 0x6D,
Bits [3:0]
(Note 1)
Reg. 0x3C, Bit 3
Reg. 0x3D
Reg. 0x6E,
Bits [3:0]
Reg. 0x6E,
Bits [7:4]
(Note 1)
Temperature Data REPLACE Mode
The REPLACE mode is configured by setting Bit 4 of
Register 0x36. In this mode, the data in the existing
Remote 1 registers are replaced by PECI0 data. This is a
legacy mode that allows the thermal data from CPU1 to be
stored in the same registers as in the ADT7476A. This
reduces the software changes in systems transitioning from
CPUs with thermal diodes to CPUs with a PECI interface.
However, note that even though the associated registers are
swapped, the correct data format (PECI vs. absolute
temperature, see Table 6) must be written to and interpreted
from these registers.
Notes
In Table 16, registers listed under the Remote 1 Default
column are in absolute temperature format by default and
are in PECI format in REPLACE mode. Registers listed
under the PECI0 Default column are in PECI format by
default and in absolute temperature format in REPLACE
mode.
Temperature offset Reg. 0x70 Reg. 0x94
Operating Point for Reg. 0x8B Reg. 0x8A
Dynamic T MIN
1. In REPLACE mode, the Remote 2 and local temperature
hysteresis values are swapped.
In REPLACE mode, the temperature zone controlling the
relevant PWM output are also swapped from Remote 1 to
PECI0. The swap of control only occurs if the default
behavior setting for Register 0x5C Bits [7:5],
Register 0x5D Bits [7:5] or Register 0x5E Bits [7:5] is 000.
Local Temperature Measurement
The ADT7490 contains an on-chip band gap temperature
sensor whose output is digitized by the on-chip 10-bit ADC.
The 8-bit MSB temperature data is stored in the local
temperature register (Address 0x26). Because both positive
and negative temperatures can be measured, the temperature
data is stored in Offset 64 format or twos complement
format, as shown in Table 17 and Table 18. Theoretically,
the temperature sensor and ADC can measure temperatures
from ? 128 ? C to +127 ? C (or ? 64 ? C to +191 ? C in the
extended temperature range) with a resolution of 0.25 ? C.
However, this exceeds the operating temperature range of
the device, so local temperature measurements outside the
ADT7490 operating temperature range are not possible.
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