công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
|
SC622A bảng dữ liệu(PDF) 20 Page - Semtech Corporation |
|
SC622A bảng dữ liệu(HTML) 20 Page - Semtech Corporation |
20 / 23 page SC622A 20 The I2C General Specification The SC622A is a read-write slave-mode I2C device and complies with the Philips I2C standard Version 2.1, dated January 2000. The SC622A has four user-accessible internal 8-bit registers. The I2C interface has been designed for program flexibility, supporting direct format for write operation. Read operations are supported on both combined format and stop separated format. While there is no auto increment/decrement capability in the SC622A I2C logic, a tight software loop can be designed to randomly access the next register independent of which register you begin accessing. The start and stop commands frame the data-packet and the repeat start condition is allowed if necessary. SC622A Limitations to the I2C Specifications The SC622A only recognizes seven bit addressing. This means that ten bit addressing and CBUS communication are not compatible. The device can operate in either standard mode (100kbit/s) or fast mode (400kbit/s). Slave Address Assignment The seven bit slave address is 0110 111x.The eighth bit is the data direction bit. 0x6E is used for a write operation, and 0x6F is used for a read operation. Supported Formats The supported formats are described in the following subsections. Direct Format — Write The simplest format for an I2C write is direct format. After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The SC622A I2C then acknowledges that it is being addressed, and the master responds with an 8 bit data byte consisting of the register address. The slave acknowledges and the master sends the appropriate 8 bit data byte. Once again the slave acknowledges and the master terminates the transfer with the stop condition [P]. Combined Format — Read After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The SC622A I2C then acknowledges that it is being addressed, and the master responds with an 8 bit data byte consisting of the register address. The slave acknowledges and the master sends the repeated start condition [Sr]. Once again, the slave address is sent, followed by an eighth bit indicating a read. The slave responds with an acknowledge and the previously addressed 8 bit data byte; the master then sends a non-acknowledge (NACK). Finally, the master terminates the transfer with the stop condition [P]. Stop Separated Reads Stop-separated reads can also be used. This format allows a master to set up the register address pointer for a read and return to that slave at a later time to read the data. In this format the slave address followed by a write command are sent after a start [S] condition. The SC622A then acknowledges it is being addressed, and the master responds with the 8-bit register address. The master sends a stop or restart condition and may then address another slave. After performing other tasks, the master can send a start or restart condition to the SC622A with a read command. The device acknowledges this request and returns the data from the register location that had previously been set up. Serial Interface |
Số phần tương tự - SC622A |
|
Mô tả tương tự - SC622A |
|
|
Link URL |
Chính sách bảo mật |
ALLDATASHEET.VN |
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không? [ DONATE ] |
Alldatasheet là | Quảng cáo | Liên lạc với chúng tôi | Chính sách bảo mật | Trao đổi link | Tìm kiếm theo nhà sản xuất All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |