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ADT7467
temperature below ? 63 ? C is entered, the temperature is
clamped to ? 63 ? C. In this mode, the diode fault condition
remains ? 128 ? C = 1000 0000, whereas the fault condition is
represented by ? 64 ? C = 0000 0000 in the extended
temperature range ( ? 64 ? C to +191 ? C).
Table 9. TEMPERATURE MEASUREMENT
REGISTERS
Additional ADC Functions for Temperature
Measurement
A number of other functions are available on the
ADT7467 to offer the system designer increased flexibility.
Turn-off Averaging
For each temperature measurement read from a value
register, 16 readings are made internally, the results of which
Register
0x25
0x26
0x27
0x77
Description
Remote 1 Temperature
Local Temperature
Remote 2 Temperature
Extended Resolution 2
Default
0x01
0x01
0x01
0x00
are averaged and then placed into the value register.
Sometimes it is necessary to perform a very fast
measurement. Setting Bit 4 of Configuration Register 2
(0x73) turns averaging off.
Table 12. CONVERSION TIME WITH AVERAGING
DISABLED
Table 10. EXTENDED RESOLUTION TEMPERATURE
MEASUREMENT REGISTER BITS
Channel
Voltage Channels
Measurement Time
0.7 ms
Bit
<7:6>
<5:4>
<3:2>
Mnemonic
TDM2
LTMP
TDM1
Description
Remote 2 Temperature LSBs
Local Temperature LSBs
Remote 1 Temperature LSBs
Remote Temperature 1
Remote Temperature 2
Local Temperature
7 ms
7 ms
1.3 ms
Temperature Measurement Limit Registers
High and low limit registers are associated with each
Table 13. CONVERSION TIME WITH AVERAGING
ENABLED
temperature measurement channel. Exceeding the
programmed high or low limit sets the appropriate status bit
and can also generate SMBALERT interrupts.
Table 11. TEMPERATURE MEASUREMENT LIMIT
REGISTERS
Channel
Voltage Channels
Remote Temperature
Local Temperature
Measurement Time
11 ms
39 ms
12 ms
Register
0x4E
0x4F
0x50
0x51
0x52
0x53
Description
Remote 1 Temperature Low Limit
Remote 1 Temperature High Limit
Local Temperature Low Limit
Local Temperature High Limit
Remote 2 Temperature Low Limit
Remote 2 Temperature High Limit
Default
0x01
0x7F
0x01
0x7F
0x01
0x7F
Single-channel ADC Conversions
Setting Bit 6 of Configuration Register 2 (0x73) places
the ADT7467 into single-channel ADC conversion mode. In
this mode, users can read a single temperature channel only.
The appropriate ADC channel is selected by writing to
Bits <7:5> of the TACH1 minimum high byte register
(0x55).
Table 14. CHANNEL SELECTION
Reading Temperature from the ADT7467
It is important to note that temperature can be read from
the ADT7467 as an 8-bit value (with 1 ? C resolution) or as
a 10-bit value (with 0.25 ? C resolution). If only 1 ? C
resolution is required, the temperature readings can be read at
any time and in no particular order.
Bits <7:5>, Register 0x55
101
110
111
Channel Selected
Remote 1 Temperature
Local Temperature
Remote 2 Temperature
If the 10-bit measurement is required, this involves a
2-register read for each measurement. The extended
resolution register (0x77) should be read first. Then all
temperature reading registers freeze until all temperature
reading registers are read. This prevents updating of an MSB
reading while its two LSBs are read and vice versa.
Configuration Register 2 (0x73)
<4> = 1, Averaging Off
<6> = 1, Single-channel Convert Mode
TACH1 Minimum High Byte (0x55)
<7:5> Selects ADC Channel for Single-channel Convert
Mode
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