- 您现在的位置：买卖IC网 > PDF目录69481 > TC74A5-3.3VCT SPECIALTY ANALOG CIRCUIT, PDSO5 PDF资料下载
参数资料
| 型号： | TC74A5-3.3VCT |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| 封装： | SOT-23A, 5 PIN |
| 文件页数： | 14/16页 |
| 文件大小： | 430K |
| 代理商： | TC74A5-3.3VCT |
2002 Microchip Technology Inc.
DS21462B-page 7
TC74
3.0
DETAILED DESCRIPTION
3.1
Functional Description
The
TC74
acquires
and
converts
temperature
information from its onboard solid-state sensor with a
resolution 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 when
temperature acquisition is suspended.
3.1.1
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. Table 3-1 summarizes this operation.
TABLE 3-1:
STANDBY MODE OPERATION
3.1.2
SMBUS SLAVE ADDRESS
The TC74 is internally programmed to have a default
SMBus address value of 1001 101b. Seven other
addresses are available by custom order (contact
factory).
3.2
Serial Port Operation
The Serial Clock input (SCL) and bi-directional data
port (SDA) form a 2-wire bi-directional serial port for
programming
and
interrogating
the
TC74.
The
following conventions are used in this bus architecture:
TABLE 3-2:
SERIAL BUS CONVENTIONS
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 3-1 All data transfers have two
phases; all bytes are transferred MSB first. Accesses
are initiated by a START condition, 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. A
convention called Acknowledge (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).
SHDN Bit
Operating Mode
0Normal
1
Standby
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
pulsefor theACK cycle.
Busy
Communication is not possible because the
busisinuse.
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 condi-
tions.)
相关PDF资料 |
PDF描述 |
|---|---|
| TC74A2-5.0VCT | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| TC74A0-5.0VCT | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| TC74HC4052AFT | DUAL 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, PDSO16 |
| TC74HC4052AF | DUAL 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, PDSO16 |
| TC74HC4053AP | TRIPLE 2-CHANNEL, SGL ENDED MULTIPLEXER, PDIP16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC74A5-5.0VAT | 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 |
| TC74A5-5.0VAT | 制造商:Microchip Technology Inc 功能描述:Temperature Sensor IC |
| TC74A5-5.0VCT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Tiny Serial Digital Thermal Sensor |
| TC74A5-5.0VCTTR | 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 |
| TC74A5-5.0VCTTRG | 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 |
发布紧急采购，3分钟左右您将得到回复。