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AS3956 数据表(PDF) 74 Page - ams AG |
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AS3956 数据表(HTML) 74 Page - ams AG |
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74 / 107 page ![]() Page 74 ams Datasheet Document Feedback [v1-11] 2018-Nov-14 AS3956 − Detailed Description EEPROM Read In order to read data from EEPROM, first a slave address and mode byte is sent, followed by the block address byte (MSB first). Then one or more blocks of data with address auto-incrementing (packets of 4 bytes) are transferred via SDA line, also MSB first. SDA is sampled at the SCL falling edge. In case the block on defined address does not exist, all 0 data is sent via SDA line. Figure 77: Reading a EEPROM Block over I²C Loading Transmission Data into Buffer Loading the transmitting data into the buffer is similar to writing data into an addressable register. Difference is that, in case of loading more bytes, all bytes go to the buffer. The command mode code 10b indicates buffer operations. The following figure shows how to load the transmitting data into the buffer. Figure 78: Loading Data into Buffer over I²C A 6 A 5 A 4 A 3 A 2 A 1 A 0 0 1 11 111 A C K 0 S Slave address W A 6 W A 5 W A 4 W A 3 W A 2 W A 1 1 A C K W A 0 x EEPROM page address EEPROM read command SCL SDA A C K P Slave address A 2 A 1 A 0 1 A C K A 4 A 3 A 6 A 5 S Data D 3 D 2 D 1 D 0 N A K D 5 D 4 D 7 D 6 A 6 A 5 A 4 A 3 A 2 A 1 A 0 0 0 00 000 A C K 1 P S Data Slave address D 7 D 6 D 5 D 4 D 3 D 2 0 A C K D 1 D 0 D 3 D 2 D 1 D 0 A C K D 5 D 4 D 7 D 6 Data Load buffer command SCL SDA A C K |
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