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參數(shù)資料
| 型號(hào)： | MAX6698UE99+ |
| 廠商： | Maxim Integrated |
| 文件頁(yè)數(shù)： | 16/24頁(yè) |
| 文件大?。?/td> | 321K |
| 描述： | IC TEMP MONITOR 7CH 16-TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 96 |
| 功能： | 溫度監(jiān)控系統(tǒng)（傳感器） |
| 傳感器類型： | 內(nèi)部和外部 |
| 感應(yīng)溫度： | -40°C ~ 125°C |
| 精確度： | ±3.5°C 本地（最大），±3°C 遠(yuǎn)程（最大） |
| 拓?fù)洌?/td> | ADC，緩沖器，多路復(fù)用器，寄存器庫(kù) |
| 輸出類型： | 2 線串行，I²C?/SMBUS? |
| 輸出警報(bào)： | 是 |
| 輸出風(fēng)扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-TSSOP |
| 包裝： | 管件 |
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7-Channel Precision Remote-Diode, Thermistor,
and Local Temperature Monitor
16 ______________________________________________________________________________________
VREF supplies a reference voltage (1V nominal) to bias
the thermistor/REXT_ voltage-divider. The voltage
across REXT is measured by the MAX6698s ADC,
resulting in a voltage that is directly proportional to tem-
perature. The data in the thermistor registers gives the
voltage across REXT as a fraction of the reference volt-
age (1LSB = 0.5% of VREF).
Because thermistors have nonlinear temperature-resis-
tance functions, and because different thermistors have
different functions, it is important to understand the
relationship between temperature, REXT, and the volt-
age across REXT for a given thermistor. Table 13
shows temperature vs. the thermistor channel data for a
Betatherm 10k3A1 thermistor and REXT=1600&.
Thermal Mass and Self-Heating
When sensing local temperature, the MAX6698 mea-
sures the temperature of the printed-circuit board
(PCB) to which it is soldered. The leads provide a good
thermal path between the PCB traces and the die. As
with all IC temperature sensors, thermal conductivity
between the die and the ambient air is poor by compar-
ison, making air temperature measurements impracti-
cal. Because the thermal mass of the PCB is far greater
than that of the MAX6698, the device follows tempera-
ture changes on the PCB with little or no perceivable
delay. When measuring the temperature of a CPU or
other IC with an on-chip sense junction, thermal mass
has virtually no effect; the measured temperature of the
junction tracks the actual temperature within a conver-
sion cycle.
When measuring temperature with discrete remote tran-
sistors, the best thermal response times are obtained
with transistors in small packages (i.e., SOT23 or
SC70). Take care to account for thermal gradients
between the heat source and the sensor, and ensure
that stray air currents across the sensor package do
not interfere with measurement accuracy. Self-heating
does not significantly affect measurement accuracy.
Remote-sensor self-heating due to the diode current
source is negligible.
ADC Noise Filtering
The integrating ADC has good noise rejection for low-
frequency signals such as power-supply hum. In envi-
ronments with significant high-frequency EMI, connect
an external 2200pF capacitor between DXP_ and
DXN_. Larger capacitor values can be used for added
filtering, but do not exceed 3300pF because it can
introduce errors due to the rise time of the switched
current source. High-frequency noise reduction is
needed for high-accuracy remote measurements.
Noise can be reduced with careful PCB layout as dis-
cussed in the PCB Layout section.
PCB Layout
Follow these guidelines to reduce the measurement
error when measuring remote temperature:
1) Place the MAX6698 as close as is practical to the
remote diode. In noisy environments, such as a
computer motherboard, this distance can be 4in to
8in (typ). This length can be increased if the worst
noise sources are avoided. Noise sources include
CRTs, clock generators, memory buses, and PCI
buses.
2) Do not route the DXP-DXN lines next to the deflec-
tion coils of a CRT. Also, do not route the traces
across fast digital signals, which can easily intro-
duce +30癈 error, even with good filtering.
MANUFACTURER
MODEL NO.
Central Semiconductor (USA)
CMPT3904
Rohm Semiconductor (USA)
SST3904
Samsung (Korea)
KST3904-TF
Siemens (Germany)
SMBT3904
Zetex (England)
FMMT3904CT-ND
Table 11. Remote-Sensors Transistor
Manufacturers
Note: Discrete transistors must be diode connected (base
shorted to collector).
PART
SMBus SLAVE ID PIN-PA KA E
MAX6698EE34
0011 010
16 QSOP
MAX6698EE38
0011 100
16 QSOP
MAX6698EE99
1001 100
16 QSOP
MAX6698EE9C
1001 110
16 QSOP
MAX6698UE34
0011 010
16 TSSOP
MAX6698UE38
0011 100
16 TSSOP
MAX6698UE99
1001 100
16 TSSOP
MAX6698UE9C
1001 110
16 TSSOP
Table 12. Slave Address
Table 12 lists the MAX6698 slave addresses.
Slave Addresses
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6698UE99+ | 功能描述:板上安裝溫度傳感器 7Ch Precision Remote Diode Thermistor 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 |
| MAX6698UE99+T | 功能描述:板上安裝溫度傳感器 7Ch Precision Remote Diode Thermistor 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 |
| MAX6698UE99-T | 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 |
| MAX6698UE9C | 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 |
| MAX6698UE9C+ | 功能描述:板上安裝溫度傳感器 7Ch Precision Remote Diode Thermistor 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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