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| 型号： | ADT7461AARMZ-R |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/19页 |
| 文件大小： | 294K |
| 描述： | IC TEMP SENSOR DGTL 2CH 8-MSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 3,000 |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部和外部 |
| 感应温度： | 0°C ~ 127°C，-55°C ~ 150°C |
| 精确度： | ±3°C |
| 拓扑： | ADC，比较器，多路复用器，寄存器库 |
| 输出类型： | 2 线 SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 120°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | Micro8? |
| 包装： | 带卷 (TR) |
ADT7461A
http://onsemi.com
11
The ALERT
interrupt latch is not reset by reading the
status register. It resets when the ALERT
output has been
serviced by the master reading the device address, provided
the error condition has gone away and the status register flag
bits are reset.
When Flag 1 and/or Flag 0 are set, the THERM
output
goes low to indicate that the temperature measurements are
outside the programmed limits. The THERM
output does
not need to be reset, unlike the ALERT
output. Once the
measurements are within the limits, the corresponding status
register bits are automatically reset and the THERM
output
goes high. The user may add hysteresis by programming
Register 0x21. The THERM
output is reset only when the
temperature falls to limit value minus the hysteresis value.
When Pin 6 is configured as THERM2
, only the high
temperature limits are relevant. If Flag 6 and/or Flag 4 are
set, the THERM2
output goes low to indicate that the
temperature measurements are outside the programmed
limits. Flag 5 and Flag 3 have no effect on THERM2
. The
behavior of THERM2
is otherwise the same as THERM
.
Table 11. STATUS REGISTER BIT ASSIGNMENTS
Bit
Name
Function
7
BUSY
1 when ADC is converting
6
LHIGH
(Note 1)
1 when local high temperature limit is
tripped
5
LLOW
(Note 1)
1 when local low temperature limit is
tripped
4
RHIGH
(Note 1)
1 when remote high temperature limit is
tripped
3
RLOW
(Note 1)
1 when remote low temperature limit is
tripped
2
OPEN
(Note 1)
1 when remote sensor is an open circuit
1
RTHRM
1 when remote THERM
limit is tripped
0
LTHRM
1 when local THERM
limit is tripped
1. These flags stay high until the status register is read or they are
reset by POR unless Pin 6 is configured as THERM2
. Then, only
Bit 2 remains high until the status register is read or is reset by
POR.
Offset Register
Offset errors can be introduced into the remote
temperature measurement by clock noise or when the
thermal diode is located away from the hot spot. To achieve
the specified accuracy on this channel, these offsets must be
removed.
The offset value is stored as a 10-bit, twos complement
value in Register 0x11 (high byte) and Register 0x12 (low
byte, left justified). Only the upper two bits of Register 0x12
are used. The MSB of Register 0x11 is the sign bit. The
minimum, programmable offset is 128癈, and the
maximum is +127.75癈. The value in the offset register is
added to, or subtracted from, the measured value of the
remote temperature.
The offset register powers up with a default value of 0癈
and has no effect unless the user writes a different value to it.
Table 12. SAMPLE OFFSET REGISTER CODES
Offset Value
0x11
0x12
128癈
1000 0000
00 00 0000
4癈
1111 1100
00 00 0000
1癈
1111 1111
00 000000
0.25癈
1111 1111
10 00 0000
0癈
0000 0000
00 00 0000
+0.25癈
0000 0000
01 00 0000
+1癈
0000 0001
00 00 0000
+4癈
0000 0100
00 00 0000
+127.75癈
0111 1111
11 00 0000
One-Shot Register
The one-shot register is used to initiate a conversion and
comparison cycle when the ADT7461A is in standby mode,
after which the device returns to standby. Writing to the
one-shot register address (0x0F) causes the ADT7461A to
perform a conversion and comparison on both the internal
and the external temperature channels. This is not a data
register as such, and it is the write operation to Address 0x0F
that causes the one-shot conversion. The data written to this
address is irrelevant and is not stored.
Consecutive ALERT
Register
The value written to this register determines how many
out-of-limit measurements must occur before an ALERT
is
generated. The default value is that one out-of-limit
measurement generates an ALERT
. The maximum value
that can be chosen is 4. The purpose of this register is to
allow the user to perform some filtering of the output. This
is particularly useful at the fastest three conversion rates,
where no averaging takes place. This register is at
Address 0x22.
Table 13. CONSECUTIVE ALERT
REGISTER CODES
Register Value
Number of Out-of-Limit
Measurements Required
yxxx 000x
1
yxxx 001x
2
yxxx 011x
3
yxxx 111x
4
NOTE: x = dont care bits, and y = SMBus timeout bit.
Default = 0. See SMBus section for more information.
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