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參數(shù)資料
| 型號(hào)： | MAX1668 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Multichannel Remote/Local Temperature Sensors |
| 中文描述： | 多通道遠(yuǎn)端/本地溫度傳感器 |
| 文件頁(yè)數(shù)： | 6/17頁(yè) |
| 文件大?。?/td> | 285K |
| 代理商： | MAX1668 |
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M
Multichannel Remote/Local
Temperature Sensors
6
_______________________________________________________________________________________
_______________Detailed Description
The MAX1668/MAX1805/MAX1989 are temperature
sensors designed to work in conjunction with an exter-
nal microcontroller (μC) or other intelligence in thermo-
static, process-control, or monitoring applications. The
μC is typically a power-management or keyboard con-
troller, generating SMBus serial commands by “bit-
banging” general-purpose input-output (GPIO) pins or
through a dedicated SMBus interface block.
These devices are essentially 8-bit serial analog-to-digi-
tal converters (ADCs) with sophisticated front ends.
However, the MAX1668/MAX1805/MAX1989 also contain
a switched current source, a multiplexer, an ADC, an
SMBus interface, and associated control logic (Figure 1).
In the MAX1668 and MAX1989, temperature data from
the ADC is loaded into five data registers, where it is
automatically compared with data previously stored in
10 over/undertemperature alarm registers. In the
MAX1805, temperature data from the ADC is loaded into
three data registers, where it is automatically compared
with data previously stored in six over/undertemperature
alarm registers.
ADC and Multiplexer
The ADC is an averaging type that integrates over a
64ms period (each channel, typical), with excellent
noise rejection.
The multiplexer automatically steers bias currents
through the remote and local diodes, measures their
forward voltages, and computes their temperatures.
Each channel is automatically converted once the con-
version process has started. If any one of the channels
is not used, the device still performs measurements on
these channels, and the user can ignore the results of
the unused channel. If any remote-diode channel is
unused, connect DXP_ to DXN_ rather than leaving the
pins open.
The DXN_ input is biased at 0.65V above ground by an
internal diode to set up the A/D inputs for a differential
measurement. The worst-case DXP_ to DXN_ differential
input voltage range is 0.25V to 0.95V.
Excess resistance in series with the remote diode caus-
es about +0.5°C error per ohm. Likewise, 200μV of offset
voltage forced on DXP_ to DXN_ causes about 1°C error.
MAX1668/
MAX1989
FUNCTION
1, 3, 5, 7
DXP_
Combined Current Source and A/D Positive Input for Remote-Diode Channel. Do not
leave DXP floating; connect DXP to DXN if no remote diode is used. Place a 2200pF
capacitor between DXP and DXN for noise filtering.
PIN
12
ALERT
SMBus Alert (Interrupt) Output, Open Drain
11
ADD0
SMBus Slave Address Select Pin
10
ADD1
SMBus Address Select Pin (Table 8). ADD0 and ADD1 are sampled upon power-up.
Excess capacitance (>50pF) at the address pins when floating can cause address-
recognition problems.
15
STBY
Hardware Standby Input. Temperature and comparison threshold data are retained in
standby mode. Low = standby mode, high = operate mode.
Ground
No Connection. Not internally connected. Can be used for PC board trace routing.
14
SMBCLK
SMBus Serial-Clock Input
13
SMBDATA
SMBus Serial-Data Input/Output, Open Drain
1, 3
12
11
10
15
14
13
Pin Description
NAME
MAX1805
2, 4, 6, 8
DXN_
Combined Current Sink and A/D Negative Input. DXN is normally biased to a diode volt-
age above ground.
Supply Voltage Input, 3V to 5.5V. Bypass to GND with a 0.1μF capacitor. A 200
series
resistor is recommended but not required for additional noise filtering.
2, 4
9
V
CC
9
16
—
GND
N.C.
16
5–8
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| MAX1668MEE | Multichannel Remote/Local Temperature Sensors |
| MAX1989MUE | Multichannel Remote/Local Temperature Sensors |
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| MAX167BCNG | CMOS 12-Bit A/D Converters With Track-and-Hold |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1668EVKIT | 功能描述:板上安裝溫度傳感器 Multichannel Remote/Local Temperature Sensors 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 |
| MAX1668EVSYS | 功能描述:板上安裝溫度傳感器 Evaluation System for the MAX1668 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 |
| MAX1668MEE | 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 |
| MAX1668MEE+ | 功能描述:板上安裝溫度傳感器 MultiCh Remote Local 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 |
| MAX1668MEE+T | 功能描述:板上安裝溫度傳感器 MultiCh Remote Local 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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