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參數(shù)資料
| 型號： | LM94CIMT |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | TruTherTM Hardware Monitor with PI Loop Fan Control for Server Management |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO56 |
| 封裝： | MO-153EE, TSSOP-56 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 693K |
| 代理商： | LM94CIMT |
10.0 Recommended Implementation
(Continued)
20112407
Note:
100 pF cap across each thermal diode is optional and should be placed close to the LM94, if used. The maximum capacitance between thermal diode
pins is 300 pF.
Thermal diode recommended implementation
11.0 Functional Description
The LM94 provides 16 channels of voltage monitoring, 4
remote thermal diode monitors, an internal/local ambient
temperature sensor, 2 PROCHOT monitors, 4 fan tachom-
eters, 8 GPIOs, THERMTRIP monitor for masking error
events, 2 sets of 7 VID inputs, an ALERT output and all the
associated limit registers on a single chip, and communi-
cates to the rest of the baseboard over the System Manage-
ment Bus (SMBus). The LM94 also provides 2 PWM outputs
and associated fan control logic for controlling the speed of
system fans. There are two sets of fan control logic, a lookup
table and a PI (proportional/integral) loop controller. The
lookup table and PI controller are interactive, such that the
fans run at the fastest required speed. Upon a temperature
or fan tach error event, the PWM outputs may be pro-
grammed such that they automatically boost to 100% duty
cycle. A timer is included that sets the minimum time that the
fans are in the boost condition when activated by a fan tach
error.
The LM94 incorporates National Semiconductor’s TruTherm
technology for precision “Remote Diode” readings of proces-
sors on 90nm process geometry or smaller. Readings from
the external thermal diodes and the internal temperature
sensor are made available as an 9-bit two’s-complement
digital value with the LSb representing 0.5C. Filtered tem-
perature
readings
are
available
complement
digital
value
with
0.0625C.
12.0 Please contact your local sales office for complete LM94 applications
information.
as
a
12-bit
representing
two’s-
the
LSb
All but 4 of the analog inputs include internal scaling resis-
tors. External scaling resistors are required for measuring
±
12V. The inputs are converted to 8-bit digital values such
that a nominal voltage appears at
3
4
scale for positive volt-
ages and
1
4
scale for negative voltages. The analog inputs
are intended to be connected to both baseboard resident
VRDs and to standard voltage rails supplied by a SSI com-
pliant power supply.
The LM94 has logic that ties a set of dynamically moving VID
inputs to their associated Vccp analog input for real time
window comparison fault determination. Voltage mapping for
VRD10, VRD10 extended and VRD11are supported by the
LM94. When VRD10 mode is selected GPI8 and GPI9 can
be used to detect external error flags whose state is be
reflected in the status registers.
Error events are captured in two sets of mirrored status
registers (BMC Error Status Registers and Host Status Reg-
isters) allowing two controllers access to the status informa-
tion without any interference.
The LM94’s ALERT output supports interrupt mode or com-
parator mode of operation. The comparator mode is only
functional for thermal monitoring.
The LM94 provides a number of internal registers, which are
detailed in the register section of this document.
13.0 Registers
13.1 REGISTER WARNINGS
In most cases, reserved registers and register bits return zero when read. This should not be relied upon, since reserved registers
can be used for future expansion of the LM94 functions.
Some registers have “N/D” for their default value. This means that the power-up default of the register is not defined. In the case
of value registers, care should be taken to ensure that software does not read a value register until the associated measurement
function has acquired a measurement. This applies to temperatures, voltages, fan RPM, and PROCHOT monitoring.
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM94CIMT/NOPB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型: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 |
| LM94CIMTX | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型: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 |
| LM94CIMTX/NOPB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型: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 |
| LM95010 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Digital Temperature Sensor with SensorPath⑩ Bus in MSOP8 Package |
| LM95010CIMM | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型: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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