ADT7482
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10
Table 10. CONFIGURATION 2 REGISTER (ADDRESS 0x24)
Bit
Mnemonic
Function
7
Lock Bit
Setting this bit to 1 locks all lockable registers to their current values. This prevents tampering with settings
until the device is powered down. Default = 0.
<6:0>
Res
Reserved for future use.
Conversion Rate Register
The conversion rate register is at Address 0x04 for reads
and Address 0x0A for writes. The four LSBs of this register
are used to program the conversion times from 15.5 ms
(Code 0x0A) to 16 seconds (Code 0x00). To program the
ADT7482 to perform continuous measurements, set the
conversion rate register to 0x0B. For example, a conversion
rate of 8 conversions/second means that, beginning at
125 ms intervals, the device performs a conversion on the
local and the remote temperature channels. The four MSBs
of this register are reserved and should not be written to.
This register can be written to and read back over the
SMBus. The default value of this register is 0x07, giving a
rate of 8 conversions per second. Use of slower conversion
times greatly reduces the device power consumption.
Limit Registers
The ADT7482 has three limits for each temperature
channel: high, low, and THERM
temperature limits for
local, Remote 1, and Remote 2 temperature measurements.
The remote temperature high and low limits span two
registers each, to contain an upper and lower byte for each
limit. There is also a THERM
hysteresis register. All limit
registers can be written to and read back over the SMBus.
See Table 16 for limit register addresses and power-on
default values.
When Pin 8 is configured as an ALERT
output, the high
limit registers perform a > comparison while the low limit
registers perform a ?comparison. For example, if the high
limit register is programmed with 80癈, then measuring
81癈 results in an out-of-limit condition, setting a flag in the
status register. If the low limit register is programmed with
0癈, measuring 0癈 or lower results in an out-of-limit
condition.
Exceeding either the local or remote THERM
limit asserts
THERM
low. When Pin 8 is configured as THERM2
,
exceeding either the local or remote high limit asserts
THERM2
low. A default hysteresis value of 10癈 is
provided that applies to both THERM
channels. This
hysteresis value can be reprogrammed.
It is important to remember that the temperature limits
data format is the same as the temperature measurement data
format. If the temperature measurement uses the default
binary scale, then the temperature limits also use the binary
scale. If the temperature measurement scale is switched,
however, the temperature limits do not switch automatically.
The limit registers must be reprogrammed to the desired
value in the correct data format. For example, if the remote
low limit is set at 10癈 and the default binary scale is used,
the limit register value should be 0000 1010b. If the scale is
switched to offset binary, the value in the low temperature
limit register should be reprogrammed to be 0100 1010b.
Table 11. CONVERSION RATE/CHANNEL SELECTOR REGISTER (READ ADDRESS 0x04, WRITE ADDRESS 0x0A)
Bit
Mnemonic
Function
7
Reserved
Reserved for Future Use. Do Not Write to this Bit.
6
Reserved
Reserved for Future Use. Do Not Write to this Bit.
5
Reserved
Reserved for Future Use. Do Not Write to this Bit.
4
Reserved
Reserved for Future Use. Do Not Write to this Bit.
<3:0>
Conversion Rates
These Bits Set how often the ADT7482 Measures each Temperature Channel.
Conversions/sec
Time (seconds)
0000 = 0.0625
16
0001 = 0.125
8
0010 = 0.25
4
0011 = 0.5
2
0100 = 1
1
0101 = 2
500 m
0110 = 4
250 m
0111 = 8 = Default
125 m
1000 = 16
62.5 m
1001 = 32
31.25 m
1010 = 64
15.5 m
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