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参数资料
| 型号： | MAX1805MEE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/17页 |
| 文件大小： | 497K |
| 描述： | IC TEMP SENSOR REMOTE 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 功能： | 温度计，恒温计 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -55°C ~ 125°C，外部传感器 |
| 精确度： | ±3.5°C 本地（最大），±5°C 远程（最大） |
| 拓扑： | ADC，比较器，多路复用器，寄存器库 |
| 输出类型： | I²C?/SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 无 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
Multichannel Remote/Local
Temperature Sensors
______________________________________________________________________________________ 13
Manufacturer and Device
ID Codes
Two ROM registers provide manufacturer and device
ID codes. Reading the manufacturer ID returns 4Dh,
which is the ASCII code M (for Maxim). Reading the
device ID returns 03h for MAX1668, 05h for MAX1805,
and 0Bh for MAX1989. If the read word 16-bit SMBus
protocol is employed (rather than the 8-bit Read Byte),
the least significant byte contains the data and the most
significant byte contains 00h in both cases.
Configuration Byte Functions
The configuration byte register (Table 5) is used to
mask (disable) interrupts and to put the device in soft-
ware standby mode.
Status Byte Functions
The two status byte registers (Tables 6 and 7) indicate
which (if any) temperature thresholds have been
exceeded. The first byte also indicates whether the
ADC is converting and whether there is an open circuit
in a remote-diode DXP_ to DXN_ path. After POR, the
normal state of all the flag bits is zero, assuming none
of the alarm conditions are present. The status byte is
cleared by any successful read of the status byte,
unless the fault persists. Note that the ALERT interrupt
latch is not automatically cleared when the status flag
bit is cleared.
When reading the status byte, you must check for inter-
nal bus collisions caused by asynchronous ADC timing,
or else disable the ADC prior to reading the status byte
(through the RUN/STOP bit in the configuration byte).
To check for internal bus collisions, read the status
byte. If the least significant 7 bits are ones, discard the
data and read the status byte again. The status bits
LHIGH, LLOW, RHIGH, and RLOW are refreshed on the
SMBus clock edge immediately following the stop con-
dition, so there is no danger of losing temperature-relat-
ed status data as a result of an internal bus collision.
The OPEN status bit (diode continuity fault) is only
refreshed at the beginning of a conversion, so OPEN
data is lost. The ALERT interrupt latch is independent of
the status byte register, so no false alerts are generated
by an internal bus collision.
If the THIGH and TLOW limits are close together, its
possible for both high-temp and low-temp status bits to
be set, depending on the amount of time between sta-
tus read operations (especially when converting at the
fastest rate). In these circumstances, its best not to rely
on the status bits to indicate reversals in long-term tem-
perature changes and instead use a current tempera-
ture reading to establish the trend direction.
Conversion Rate
The MAX1668/MAX1805/MAX1989 are continuously
measuring temperature on each channel. The typical
conversion rate is approximately three conversions/s
(for both devices). The resulting data is stored in the
temperature data registers.
Slave Addresses
The MAX1668/MAX1805/MAX1989 appear to the
SMBus as one device having a common address for all
ADC channels. The device address can be set to one
of nine different values by pin-strapping ADD0 and
ADD1 so that more than one MAX1668/MAX1805/
MAX1989 can reside on the same bus without address
conflicts (Table 8).
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-Z
state detection.
The MAX1668/MAX1805/MAX1989 also respond to the
SMBus alert response slave address (see the Alert
Response Address section).
POR and Undervoltage Lockout
The MAX1668/MAX1805/MAX1989 have a volatile
memory. To prevent ambiguous power-supply condi-
tions from corrupting the data in memory and causing
erratic behavior, a POR voltage detector monitors V
CC
and clears the memory if V
CC
falls below 1.8V (typ, see
the Electrical Characteristics table). When power is first
applied and V
CC
rises above 1.85V (typ), the logic
blocks begin operating, although reads and writes at
V
CC
levels below 3V are not recommended. A second
V
CC
comparator, the ADC UVLO comparator, prevents
the ADC from converting until there is sufficient head-
room (V
CC
= 2.8V typ).
Power-Up Defaults
" Interrupt latch is cleared.
" Address select pins are sampled.
" ADC begins converting.
" Command byte is set to 00h to facilitate quick
remote receive byte queries.
" T
HIGH
and T
LOW
registers are set to max and min
limits, respectively.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1805MEE+ | 功能描述:板上安装温度传感器 Remote/Local Temp w/SMBus Serial Int RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| MAX1805MEE+T | 功能描述:板上安装温度传感器 Remote/Local Temp w/SMBus Serial Int RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| MAX1805MEE-T | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| MAX1806EUA08 | 功能描述:低压差稳压器 - LDO 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX1806EUA08+ | 功能描述:低压差稳压器 - LDO 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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