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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AS3955 데이터시트(PDF) 70 Page - ams AG |
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AS3955 데이터시트(HTML) 70 Page - ams AG |
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70 / 111 page  Page 70 ams Datasheet Document Feedback [v1-01] 2015-Apr-29 AS3955 − Detailed Description Direct Command Mode Direct Command Mode is comprised of one command byte and argument byte. The two msb’s of command code 11b indicate Direct Command Mode. The following six bits define command code, sent MSB first. Last two bits in argument byte indicate success of the direct command. Value 01h of the argument byte indicates that command was accepted, while 02h indicates it was rejected due to internal access priorities. The argument byte does not provide information on timing of the command execution. Figure 79: Sending a Direct Command over I²C I²C Electrical Connection The AS3955 has two built-in 3kΩ pull-up resistors on SDA and SCL lines as shown on Figure 80 and used only in I²C mode. The SPI pull-down bits in IO Configuration Register must be set 00h. Figure 80: I²C Interface with Built-In Pull-Up Resistors A 6 A 5 A 4 A 3 A 2 A 1 A 0 C 5 C 4 C 3 C 2 C 1 A C K P S Slave address A 6 A 5 A 4 A 3 A 2 A 1 C 0 A C K A 1 1 Mode Byte SCL SDA A C K 00 0 0 0 0 xx Argument byte N A K S Slave address C 7 C 6 RP=3kΩ RP=3kΩ VP_IO VSS SDA SCL AS3955 |
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