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ADT7476
automatically add a twos complement 8-bit reading to every
temperature measurement.
Changing Bit 1 of Configuration Register 5 (0x7C)
changes the resolution and therefore, the range of the
Table 19. TEMPERATURE LIMIT REGISTERS
Register Description
0x4E Remote 1 Temperature Low Limit
Default
0x81
temperature offset as either having a ? 63 ° C to +127 ° C range
with a resolution of 1 ° C or having a ? 63 ° C to +64 ° C range
with a resolution of 0.5 ° C. This temperature offset can be
used to compensate for linear temperature errors introduced
by noise.
0x4F
0x50
0x51
0x52
0x53
Remote 1 Temperature High Limit
Local Temperature Low Limit
Local Temperature High Limit
Remote 2 Temperature Low Limit
Remote 2 Temperature High Limit
0x7F
0x81
0x7F
0x81
0x7F
Table 16. TEMPERATURE OFFSET REGISTERS
Reading Temperature from the ADT7476
Register
0x70
0x71
0x72
Description
Remote 1 Temperature Offset
Local Temperature Offset
Remote 2 Temperature Offset
Default
0x00 (0 ° C)
0x00 (0 ° C)
0x00 (0 ° C)
It is important to note that temperature can be read from
the ADT7476 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
back at any time and in no particular order.
ADT7463/ADT7476 Backwards Compatible Mode
By setting Bit 0 of Configuration Register 5 (0x7C), all
temperature measurements are stored in the zone temperature
reading registers (0x25, 0x26, and 0x27) in twos complement
in the ? 63 ° C to +127 ° C range. The temperature limits must
be reprogrammed in twos complement.
If a twos complement 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,
while in the extended temperature range ( ? 63 ° C to +191 ° C),
the fault condition is represented by ? 64 ° C = 0000 0000.
Table 17. TEMPERATURE READING REGISTERS
Register Description Default
If the 10-bit measurement is required, this involves a
2-register read for each measurement. Extended Resolution
Register 2 (0x77) should be read first. This causes all
temperature reading registers to be frozen until all
temperature reading registers have been read from. This
prevents an MSB reading from being updated while its two
LSBs are being read and vice versa.
Additional ADC Functions for Temperature
Measurement
A number of other functions are available on the
ADT7476 to offer the system designer increased flexibility.
Turn-off Averaging
For each temperature measurement read from a value
0x25
0x26
0x27
0x77
Remote 1 Temperature
Local Temperature
Remote 2 Temperature
Extended Resolution 2
?
?
?
0x00
register, 16 readings have actually been made internally, and
the results averaged, before being placed into the value
register. Sometimes it is necessary to take a very fast
measurement. Setting Bit 4 of Configuration Register 2
(0x73) turns averaging off. The default round robin cycle
Table 18. EXTENDED RESOLUTION TEMPERATURE
MEASUREMENT REGISTER BITS
time takes 146.5 ms.
Table 20. CONVERSION TIME WITH AVERAGING
Bit
Mnemonic
Description
DISABLED
[7:6]
[5:4]
[3:2]
TDM2
LTMP
TDM1
Remote 2 Temperature LSBs
Local Temperature LSBs
Remote 1 Temperature LSBs
Channel
Voltage Channels
Remote Temperature 1
Measurement Time (ms)
0.7
7
Temperature Limit Registers
Associated with each temperature measurement channel
Remote Temperature 2
Local Temperature
7
1.3
are high and low limit registers. Exceeding the programmed
high or low limit causes the appropriate status bit to be set.
Exceeding either limit can also generate SMBALERT
interrupts (depending on the way the interrupt mask register
is programmed and assuming that SMBALERT is set as an
When Bit 7 of Configuration Register 6 (0x10) is set, the
default round robin cycle time increases to 240 ms.
Table 21. CONVERSION TIME WITH AVERAGING
ENABLED
output on the appropriate pin).
Channel
Voltage Channels
Remote Temperature
Local Temperature
http://onsemi.com
18
Measurement Time (ms)
11
39
12
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