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参数资料
| 型号： | TC74A1-5.0VCTRT |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| 封装： | EIAJ, SC-74A, SOT-23A, 5 PIN |
| 文件页数： | 5/10页 |
| 文件大小： | 63K |
| 代理商： | TC74A1-5.0VCTRT |
4
TC74-4 3/26/99
Tiny Serial Digital Thermal Sensor
TC74
2001 Microchip Technology Inc.
DS21462A
DETAILED DESCRIPTION
SCL
Input. SMBus serial clock. Clocks data into and out of
the TC74. See System Management Bus Specification rev.
1.0 for timing diagrams.
SDA
Bi-directional. Serial data is transferred on the SMBus
in both directions using this pin. See System Management
Bus Specification rev. 1.0 for timing diagrams.
VDD
Input. Power supply input. See electrical specifications.
GND
Input. Ground return for all TC74 functions.
FUNCTIONAL DESCRIPTION
The TC74 acquires and converts temperature informa-
tion from its on-board solid state sensor with a basic accu-
racy of
±1°C . It stores the data in an internal register which
is read through the serial port. The system interface is a
slave SMBus. The temperature data can be read at any time
through the SMBus port.
Eight SMBus addresses are
programmable for the TC74, which allows for a multi-sensor
configuration.
Also, there is low-power Standby mode
where temperature acquisition is suspended.
Standby Mode
The TC74 allows the host to put it into a low power (IDD
= 5
A, typical) Standby mode. In this mode, the A/D
converter is halted and the temperature data registers are
frozen. The SMBus port operates normally. Standby mode
is enabled by setting the SHDN bit in the CONFIG register.
The table below summarizes this operation.
Standby Mode Operation
SHDN Bit
Operating Mode
0
Normal
1
Standby
SMBus Slave Address
The TC74 is internally programmed to have a default
SMBus address value of 1001 101b.
Seven other ad-
dresses are available by custom order (contact factory).
SERIAL PORT OPERATION
The Serial Clock input (SCL) and bi-directional data port
(SDA) form a 2-wire bi-directional serial port for program-
ming and interrogating the TC74. The following conventions
are used in this bus architecture:
TC74 Serial Bus Conventions
TERM
EXPLANATION
Transmitter
The device sending data to the bus.
Receiver
The device receiving data from the bus.
Master
The device which controls the bus: initiating
transfers (START), generating the clock, and
terminating transfers. (STOP)
Slave
The device addressed by the master.
Start
A unique condition signaling the beginning of a
transfer indicated by SDA falling (High –Low)
while SCL is high.
Stop
A unique condition signaling the end of a transfer
indicated by SDA rising (Low –High) while SCL is
high.
ACK
A Receiver acknowledges the receipt of each byte
with this unique condition. The Receiver drives
SDA low during SCL high of the ACK clock-pulse.
The Master provides the clock pulse for the ACK
cycle.
Busy
Communication is not possible because the bus is
in use.
NOT Busy
When the bus is idle, both SDA and SCL will
remain high.
Data Valid
The state of SDA must remain stable during the
High period of SCL in order for a data bit to be
considered valid. SDA only changes state while
SCL is low during normal data transfers.
( See Start and Stop conditions. )
All transfers take place under control of a host, usually
a CPU or microcontroller, acting as the Master, which
provides the clock signal for all transfers. The TC74
always
operates as a Slave. The serial protocol is illustrated in
Figure 1. All data transfers have two phases; all bytes are
transferred MSB first. Accesses are initiated by a start
condition (START), followed by a device address byte and
one or more data bytes. The device address byte includes
a Read/Write selection bit. Each access must be terminated
by a Stop Condition (STOP). A convention called
Acknowl-
edge (ACK) confirms receipt of each byte. Note that SDA
can change only during periods when SCL is LOW (SDA
changes while SCL is HIGH are reserved for Start and Stop
Conditions).
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相关代理商/技术参数 |
参数描述 |
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| TC74A2-3.3VAT | 功能描述:板上安装温度传感器 Digital Thermal 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 |
| TC74A2-3.3VCT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Tiny Serial Digital Thermal Sensor |
| TC74A2-3.3VCTTR | 功能描述:板上安装温度传感器 Digital Thermal 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 |
| TC74A2-3.3VCTTRG | 功能描述:板上安装温度传感器 Digital Thermal 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 |
| TC74A2-33VAT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Tiny Serial Digital Thermal Sensor |
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