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參數(shù)資料
| 型號(hào)： | MIC184BM TR |
| 廠(chǎng)商： | Micrel Inc |
| 文件頁(yè)數(shù)： | 7/20頁(yè) |
| 文件大?。?/td> | 483K |
| 描述： | IC SUPERVISOR LOCAL/REMOTE 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 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)洌?/td> | ADC（三角積分型），寄存器庫(kù) |
| 輸出類(lèi)型： | I²C?/SMBus? |
| 輸出警報(bào)： | 是 |
| 輸出風(fēng)扇： | 無(wú) |
| 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-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
| 其它名稱(chēng)： | MIC184BMTR MIC184BMTR-ND |
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May 2006
7
MIC184
MIC184
Micrel
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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 tem-
perature is calculated by measuring the forward voltage of a
diode junction at two different bias current levels. An internal
multiplexer directs the current sources output to either an
internal or external diode junction.
The MIC184 uses twos-complement data to represent
temperatures. If the MSB of a temperature value is 0, the
temperature is e 0癈. If the MSB is 1, the temperature is <
0? More detail on this is given in Temperature Data For-
mat below. A temperature event results if the value in the
temperature 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 conguration register deter-
mines whether readings are taken from the on-chip sensor
or from the A2/T1 input. At power-up, the ZONE bit of the
conguration 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-con-
nected 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癈). This will cause an overtemperature event to oc-
cur whenever T_SET d +127.0癈 (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癈 until
the fault condition is cleared. This fault detection requires
that the MIC184 complete the number of conversion cycles
specied by Fault_Queue. The MIC184 may therefore require
one or more conversion cycles following power-on or a transi-
tion 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 operations for
communication with its host. The SMBus WRITE_BYTE and
WRITE_WORD operations involve sending the devices 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 similar, but is a composite
write and read operation: the host rst sends the devices
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 to be read from
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?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
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Table 2. MIC184 Register Addresses
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| MIC184YM | 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(xiàn)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 |
| 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(xiàn)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 |
| MIC184YMM | 功能描述:板上安裝溫度傳感器 Improved LM75 Series Local/Remote Temperature Sensor in MSOP-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(xiàn)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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