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| 型号： | AT73C224-A |
| 厂商： | Atmel |
| 文件页数： | 17/75页 |
| 文件大小： | 0K |
| 描述： | IC PWR MGMT ANALOG PMAAC 32QFN |
| 标准包装： | 490 |
| 应用： | 手持/移动设备 |
| 电源电压： | 2.8 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 托盘 |
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AT73C224
5.3.2.2
TWI Operation
The TWI interface allows a microcontroller to proceed to read or write accesses to the internal
registers of the AT73C224-x. Unlike the SPI, the TWI operation is based on a standard which
defines a data-link layer and an addressing scheme. The TWI implementation used in the
AT73C224-x conforms to this standard, with the following restrictions:
? slave only
? bit rate: 400 kbps max
? 7-bit fixed address: the default value is 1001001 (D3 is high). But the external D3 bit can
modify it. When D3 is low, the 7-bit fixed address is 1001000 .
? TWCK is an input pin for the clock
? TWD is a bidirectional pin driving (open drain with external resistor connected to V DDIO ) or
receiving the serial data.
The data put on TWD line must be 8 bits long. Data is transferred MSB first. Each byte must be
followed by an acknowledgement. Each transfer begins with a Start condition and terminates
with a STOP condition.
? A high-to-low transition on TWD while TWCK is high defines a START condition.
? A low-to-high transition on TWD while TWCK is high defines a STOP condition.
Figure 5-8.
TWI Start/Stop Condition
TWD
TWCK
START
STOP
Figure 5-9.
TWD
TWCK
TWI Protocol
START
Address
R/W
Ack
Data
Ack
Data
Ack
STOP
After the host initiates a START condition, it sends the 7-bit slave address, as defined above, to
notify the slave device. A Read/Write bit follows (Read = 1, Write = 0). The device acknowledges
each received byte. The first byte sent after device address and R/W bit is the address of the
device register the host wants to read or write. For a write operation, the data follows the internal
address. For a read operation, a repeated START condition needs to be generated followed by
a read on the device.
17
6266A–PMAAC–08-Sep-08
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AT73C224-B | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC) |
| AT73C224-C | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC) |
| AT73C224-D | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC) |
| AT73C224-E | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC) |
| AT73C224-EK1 | 功能描述:电源管理IC开发工具 AT73C224 EVALUATION KIT RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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