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參數(shù)資料
| 型號： | MAX1618 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Remote Temperature Sensor with SMBus Serial Interface |
| 中文描述： | 遠(yuǎn)程溫度傳感器，帶有SMBus串行接口 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 430K |
| 代理商： | MAX1618 |
Slave Addresses
The device address can be set to one of nine different
values by pin-strapping ADD0 and ADD1 so more than
one MAX1618 can reside on the same bus without
address conflicts (Table 6).
The address pin states are checked at POR only, and
the address data stays latched to reduce quiescent
supply current due to the bias current needed for high-
impedance (high-Z) state detection.
The MAX1618 also responds to the SMBus Alert
Response slave address (see the
Alert Response
Address
section).
POR and UVLO
The MAX1618 has a volatile memory. To prevent ambigu-
ous power-supply conditions from corrupting the data in
the memory and causing erratic behavior, a POR voltage
detector monitors V
CC
and clears the memory if V
CC
falls
below 1.7V (typical, see the
Electrical Characteristics
table). When power is first applied and V
CC
rises above
1.75V (typ), the logic blocks begin operating, although
reads and writes at V
CC
levels below 3V are not recom-
mended. A second V
CC
comparator, the ADC UVLO com-
parator, prevents the ADC from converting until there is
sufficient headroom (V
CC
= 2.8V typ).
Power-Up Defaults:
Interrupt latch is cleared.
Address select pins are sampled.
Command byte is set to 01h to facilitate quick
remote Receive Byte queries.
T
HIGH
and T
LOW
registers are set to max and min
limits, respectively.
Device is in normal mode. (
ALERT
acts as a latched
interrupt output.)
Pentium II is a registered trademark of Intel Corp.
Applications Information
Remote Diode Selection
Temperature accuracy depends on having a good-
quality, diode-connected, small-signal transistor.
Accuracy has been experimentally verified for all of the
devices listed in Table 7. The MAX1618 can also direct-
ly measure the die temperature of CPUs and other inte-
grated circuits with on-board temperature sensing
diodes, such as the Intel Pentium II
.
The transistor must be a small-signal type with a rela-
tively high forward voltage. This ensures that the input
voltage is within the A/D input voltage range. The for-
ward voltage must be greater than 0.25V at 10μA at the
highest expected temperature. The forward voltage
must be less than 0.95V at 100μA at the lowest expect-
ed temperature. The base resistance has to be less
than 100
. Tight specification of forward-current gain
(+50 to +150, for example) indicates that the manufac-
turer has good process controls and that the devices
have consistent V
BE
characteristics. Do not use power
transistors.
ADC Noise Filtering
The integrating ADC has inherently good noise rejec-
tion, especially of low-frequency signals such as
60Hz/120Hz power-supply hum. Micropower operation
places constraints on high-frequency noise rejection.
Lay out the PCB carefully with proper external noise fil-
tering for high-accuracy remote measurements in elec-
trically noisy environments.
Filter high-frequency electromagnetic interference
(EMI) at DXP and DXN with an external 2200pF capaci-
tor connected between the two inputs. This capacitor
can be increased to about 3300pF (max), including
cable capacitance. A capacitance higher than 3300pF
M
Remote Temperature Sensor
with SMBus Serial Interface
12
______________________________________________________________________________________
0011 001
0011 010
High-Z
V
CC
GND
GND
0011 000
ADDRESS
0101 001
0101 010
GND
High-Z
High-Z
High-Z
0101 011
1001 100
V
CC
GND
High-Z
V
CC
1001 101
1001 110
High-Z
V
CC
V
CC
V
CC
GND
GND
ADD0
ADD1
Table 6. Slave Address Decoding
(ADD0 and ADD1)
Note:
High-Z means the pin is left unconnected and floating.
Note:
Transistors must be diode-connected (short the base to
the collector).
SMBT3904
Siemens (Germany)
CMPT3904
Central Semiconductor (USA)
MMBT3904
Fairchild Semiconductor (USA)
SST3904
Rohm Semiconductor (Japan)
FMMT3904CT-ND
Zetex (England)
MANUFACTURER
MODEL NUMBER
Table 7. SOT23 Type Remote-Sensor
Transistor Manufacturers
MMBT3904
Motorola (USA)
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| MAX1618MUB | Remote Temperature Sensor with SMBus Serial Interface |
| MAX1619MEE | Remote/Local Temperature Sensor with Dual- Alarm Outputs and SMBus Serial Interface |
| MAX1619 | Remote/Local Temperature Sensor with Dual- Alarm Outputs and SMBus Serial Interface |
| MAX1636 | Low-Voltage, Precision Step-Down Controller for Portable CPU Power |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1618EVKIT | 制造商:Maxim Integrated Products 功能描述:REMOTE TEMPERATURE SENSOR WITH SMBUS SERIAL I - Bulk |
| MAX1618MUB | 功能描述:板上安裝溫度傳感器 Sensors, Transducers 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 |
| MAX1618MUB+ | 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 |
| MAX1618MUB+T | 功能描述:板上安裝溫度傳感器 Sensors, Transducers 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 |
| MAX1618MUB-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 |
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