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參數(shù)資料
| 型號(hào)： | MIC184BMM |
| 廠商： | MICREL INC |
| 元件分類(lèi)： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Local/Remote Thermal Supervisor Advance Information |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁(yè)數(shù)： | 7/21頁(yè) |
| 文件大?。?/td> | 140K |
| 代理商： | MIC184BMM |
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November 2000
7
MIC184
MIC184
Micrel
s
u
1
A
0
0
1
1
0
0
1
1
0
0
1
1
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d
A
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1
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a
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1
1
1
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8
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0
0
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0
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0
0
0
0
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0
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I
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1
T
A
0
A
r
x
e
8
9
A
B
C
D
E
F
8
9
A
B
H
4
h
4
h
4
4
4
4
4
4
h
4
h
4
h
4
4
0
0
0
0
1
1
1
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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b
b
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b
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b
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b
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b
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Table 1. MIC184 Slave Address Settings
Temperature Measurement
The temperature-to-digital converter for both internal and
external temperature data is built around a switched current
source and a 9-bit analog-to-digital converter. The tempera-
ture is calculated by measuring the forward voltage of a diode
junction at two different bias current levels. An internal
multiplexer directs the current source
’
s output to either an
internal or external diode junction.
The MIC184 uses two
’
s-complement data to represent tem-
peratures. If the MSB of a temperature value is 0, the
temperature is
≥
0
°
C. If the MSB is 1, the temperature is < 0
°
.
More detail on this is given in
“
Temperature Data Format
”
below. A temperature eventresults if the value in the tem-
perature result register (TEMP) is greater than the value in
the overtemperature setpoint register (T_SET), or if it is less
than the value in the temperature hysteresis register
(T_HYST).
The value of the ZONE bit in the configuration register
determines whether readings are taken from the on-chip
sensor or from the A2/T1 input. At power-up, the ZONE bit of
the configuration register is set to zero. The MIC184 therefore
monitors its internal temperature and compares the result
against the contents of T_SET and T_HYST. Setting the
ZONE bit in CONFIG will result in the MIC184 acquiring
temperature data from an external diode connected to the
A2/T1 pin. This diode may be embedded in an integrated
circuit (such as a CPU, ASIC, or graphics processor), or it
may be a diode-connected discrete transistor. Once the new
value is written to CONFIG, the A/D converter will begin a new
conversion and return temperature data from the external
zone. This data will be compared against T_SET, T_HYST,
and the state of the Fault_Queue (described below). The
internal status bit (STS) and the INT output will then be
updated accordingly. See
“
Applications Information
”
for more
details on switching between zones.
Diode Faults
The MIC184 is designed to respond in a fail-safe manner to
hardware faults in the external sensing circuitry. If the con-
nection to the external diode is lost, or the sense line (A2/T1)
is shorted to V
DD
or ground, the temperature data reported by
the A/D converter will be forced to its full-scale value
(+127.5
°
C). This will cause an overtemperature event to
occur whenever T_SET
≤
+127.0
°
C (0 1111 1110
b
). An
interrupt will be generated if so enabled. The temperature
reported for the external zone will remain 0 1111 1111
b
=
+127.5
°
C until the fault condition is cleared. This fault detec-
tion requires that the MIC184 complete the number of conver-
sion cycles specified by Fault_Queue. The MIC184 may
therefore require one or more conversion cycles following
power-on or a transition from shutdown to normal operation
before reporting an external diode fault.
Serial Port Operation
The MIC184 uses standard SMBus WRITE_BYTE,
READ_BYTE, WRITE_WORD, and READ_WORD opera-
tions for communication with its host. The SMBus
WRITE_BYTE and WRITE_WORD operations involve send-
ing the device
’
s slave address (with the R/W bit low to signal
a write operation), followed by a command byte and one or
two data bytes. The SMBus READ_BYTE operation is simi-
lar, but is a composite write and read operation: the host first
sends the device
’
s slave address followed by the command
byte, as in a write operation. A new
“
start
”
bit must then be
sent to the MIC184, followed by a repeat of the slave address
with the R/W bit (LSB) set to the high (read) state. The data
e
B
H
_
d
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a
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y
0
0
0
0
1
0
1
0
0
1
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0
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B
0
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R
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a
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0
1
2
3
4
l
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M
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O
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H
_
S
_
T
a
L
T
n
p
m
0
1
0
1
0
0
0
0
0
0
b
0
h
0
h
0
h
0
h
0
h
P
t
s
e
a
e
m
0
0
0
0
b
G
T
T
C
T
r
b
S
s
t
b
E
p
s
b
d
e
v
s
e
e
s
u
t
n
o
d
·
·
·
·
·
·
1
1
1
1
1
1
1
1
b
F
F
h
Table 2. MIC184 Register Addresses
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| MIC184BMM TR | 功能描述:IC SUPERVISOR LOCAL/REMOTE 8MSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類(lèi)型:內(nèi)部和外部 感應(yīng)溫度:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠(yuǎn)程（最大） 拓?fù)?ADC（三角積分型），比較器，寄存器庫(kù) 輸出類(lèi)型:I²C?/SMBus? 輸出警報(bào):是 輸出風(fēng)扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
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| MIC184YM TR | 功能描述:板上安裝溫度傳感器 Improved LM75 Series Local/Remote Temperature Sensor in SOIC-8 Lead-Free RoHS:否 制造商:Omron Electronics 輸出類(lèi)型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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