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參數(shù)資料
| 型號： | ADT7461AR-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | 【1∑C Temperature Monitor with Series Resistance Cancellation |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | MS-012-AA, SOIC-8 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大小： | 854K |
| 代理商： | ADT7461AR-REEL |
ADT7461
Table 7. Configuration Register Bit Assignments
Bit
Name
Function
0 = ALERT Enabled
1 = ALERT Masked
0 = Run
1 = Standby
0 = ALERT
1 = THERM2
Power-On
Default
7
MASK1
0
6
RUN/STOP
0
5
ALERT/THERM2
0
4–
3
Reserved
0
2
Temperature
Range Select
0 = 0°C to 127°C
1 = Extended
Range
0
1–
0
Conversion Rate Register
The conversion rate register is Address 0×04 at read and
Address 0×0A at write. The lowest four bits of this register are
used to program the conversion rate by dividing the internal
oscillator clock by 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, or 1024 to
give conversion times from 15.5 ms (Code 0×0A) to 16 seconds
(Code 0×00). For example, a conversion rate of 8 conver-
sions/second means that beginning at 125 ms intervals the
device performs a conversion on the internal and the external
temperature channels.
Reserved
0
This register can be written to and read back over the SMBus.
The higher four bits of this register are unused and must be set
to 0. The default value of this register is 0×08, giving a rate of 16
conversions per second. Use of slower conversion times greatly
reduces the device power consumption, as shown in
Table 8. Conversion Rate Register Codes
.
Table 8
Code
Conversion/Second
Average Supply
Current μA Typ
at V
DD
= 5.5 V
121.33
128.54
131.59
146.15
169.14
233.12
347.42
638.07
252.44
417.58
816.87
0×00
0×01
0×02
0×03
0×04
0×05
0×06
0×07
0×08
0×09
0×0A
0×0B to 0×FF
0.0625
0.125
0.25
0.5
1
2
4
8
16
32
64
Reserved
Limit Registers
The ADT7461 has eight limit registers: high, low, and THERM
temperature limits for both local and remote 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
for details of the limit registers’ addresses and their
power-on default values.
Table 12
When Pin 6 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°C, then measuring 81°C will result in an
out-of-limit condition, setting a flag in the status register. If the
low limit register is programmed with 0°C, measuring 0°C or
lower will result in an out-of-limit condition.
Exceeding either the local or remote THERM limit asserts
THERM low. When Pin 6 is configured as THERM2, exceeding
either the local or remote high limit asserts THERM2 low. A
default hysteresis value of 10°C is provided that applies to both
THERM channels. This hysteresis value may be reprogrammed
to any value after power up (Register Address 0×21).
It is important to remember that the temperature limits data
format is the same as the temperature measurement data
format. So if the temperature measurement uses default binary,
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 user must
reprogram the limit registers to the desired value in the correct
data format. For example, if the remote low limit is set at 10°C
and the default binary scale is being 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.
Status Register
The status register is a read-only register, at Address 0×02. It
contains status information for the ADT7461.
Bit 7 of the status register indicates that the ADC is busy con-
verting when it is high. The other bits in this register flag the
out-of-limit temperature measurements (Bits 6–3 and Bits 1–0)
and the remote sensor open circuit (Bit 2).
If Pin 6 is configured as an ALERT output, the following applies. If
the local temperature measurement exceeds its limits, Bit 6 (high
limit) or Bit 5 (low limit) of the status register asserts to flag this
condition. If the remote temperature measurement exceeds its lim-
its, then Bit 4 (high limit) or Bit 3 (low limit) asserts. Bit 2 asserts to
flag an open-circuit condition on the remote sensor. These five flags
are NOR’d together, so if any of them is high, the ALERT interrupt
latch will be set and the ALERT output will go low.
Rev. 0 | Page 12 of 24
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