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参数资料
| 型号： | DS7505U+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/14页 |
| 文件大小： | 197K |
| 描述： | IC DGTL THERMOMETER 2WIRE 8-USOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 功能： | 温度计，恒温计 |
| 传感器类型： | 内部 |
| 感应温度： | -55°C ~ 125°C |
| 精确度： | ±2°C（最小值） |
| 拓扑： | ADC（三角积分型），比较器，寄存器库 |
| 输出类型： | I²C?/SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 无 |
| 电源电压： | 1.7 V ~ 3.7 V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 管件 |
Shutdown Mode
For power-sensitive applications, the DS7505 offers a
low-power shutdown mode. The SD bit in the configura-
tion register controls shutdown mode. When SD is pro-
grammed to 1, the conversion in progress is completed
and the result stored in the temperature register, after
which the DS7505 goes into a low-power standby state.
The O.S. output is cleared if the thermostat is operating
in interrupt mode and O.S remains unchanged in com-
parator mode. The 2-wire interface remains operational
in shutdown mode, and writing a 0 to the SD bit returns
the DS7505 to normal operation. Upon power-up in
shutdown mode, the DS7505 executes one tempera-
ture measurement. The result is stored in the tempera-
ture register, after which the DS7505 enters the
shutdown state.
Operation疶hermostat
The DS7505 thermostat can be programmed to power
up in either comparator mode or interrupt mode, which
activate and deactivate the open-drain thermostat out-
put (O.S.) based on user-programmable trip points
(T
OS
and T
HYST
). The T
HYST
and T
OS
registers contain
Celsius temperature values in twos complement format
and consist of EEPROM that is shadowed by SRAM.
Once written to the shadow SRAM, values can be
stored in EEPROM by issuance of a Copy Data com-
mand from the master (see the Command Set section
for more details). The device can operate using the
shadow SRAM only or using the EEPROM. If the
EEPROM is used, the values are NV and can be pro-
grammed prior to installation of the DS7505 for stand-
alone operation. The factory power-up settings for the
DS7505 are with the thermostat in comparator mode,
active-low O.S. polarity, overtemperature trip-point
(T
OS
) register set to 80癈, the hysteresis trip-point
(T
HYST
) register set to +75癈, and the number of con-
secutive conversion to trigger O.S. set to 1. If these
power-up settings are compatible with the application,
the DS7505 can be used as a stand-alone thermostat
(i.e., no 2-wire communication required) with no pro-
gramming required prior to installation. If interrupt
mode operation, active-high O.S. polarity, different T
OS
and T
HYST
values, or a different number of conversions
to trigger O.S. are desired, they must be programmed
into the EEPROM either after initial power-up or prior to
IC installation. The programmed values then become
the new power-up defaults.
In both operating modes, the user can program the
thermostat-fault tolerance, which sets how many con-
secutive temperature readings (1, 2, 4, or 6) must fall
outside the thermostat limits before the thermostat out-
put is triggered. The fault tolerance is set by the F1 and
F0 bits in the configuration register. The default factory
power-up setting for fault tolerance is 1 (F1 = 0, F0 = 0).
The data format of the T
OS
and T
HYST
registers is iden-
tical to that of the temperature register (see Figure 3),
i.e., a 2-byte twos complement representation of the
trip-point temperature in degrees Celsius with bits 3
through 0 hardwired to 0. After every temperature con-
version, the measurement is compared to the values
stored in the T
OS
and T
HYST
registers. The O.S. output
is updated based on the result of the comparison and
the operating mode of the IC. The number of T
OS
and
T
HYST
bits used during the thermostat comparison is
equal to the conversion resolution set by the R1 and R0
bits in the configuration register. For example, if the
resolution is 9 bits, only the 9 MSBs of T
OS
and T
HYST
are used by the thermostat comparator.
The active state of the O.S. output can be programmed
by the POL bit in the configuration register. The power-
up factory default is active low (POL = 0).
If the user does not wish to use the thermostat capabili-
ties of the DS7505, the O.S. output should be left
unconnected. Note that if the thermostat is not used,
the T
OS
and T
HYST
registers can be used for general
storage of system data.
Comparator Mode
When the thermostat is in comparator mode, O.S. can
be programmed to operate with any amount of hystere-
sis. The O.S. output becomes active when the mea-
sured temperature exceeds the T
OS
value a
consecutive number of times as defined by the F1 and
F0 fault tolerance (FT) bits in the configuration register.
O.S. then stays active until the first time the tempera-
ture falls below the value stored in T
HYST
. Putting the
device into shutdown mode does not clear O.S. in com-
parator mode. Thermostat comparator mode operation
with FT = 2 is illustrated in Figure 4.
Digital Thermometer and Thermostat
6 _______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS7505U+ | 功能描述:板上安装温度传感器 Thermometer & Thermostat 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 |
| DS7505U+T&R | 制造商:Maxim Integrated Products 功能描述:DGTL THERMOMETER AND THERMOSTAT 8USOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC DGTL THERMOMETER 2WIRE 8-USOP 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Thermometer & Thermostat |
| DS7505U+T&R | 功能描述:板上安装温度传感器 Thermometer & Thermostat 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 |
| DS7505UR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Digital Thermometer and Thermostat |
| DS7505UT | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Digital Thermometer and Thermostat |
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