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SM5309A Scheda tecnica(PDF) 11 Page - Nippon Precision Circuits Inc |
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SM5309A Scheda tecnica(HTML) 11 Page - Nippon Precision Circuits Inc |
11 / 24 page SM5309A SEIKO NPC CORPORATION —11 FUNCTIONAL DESCRIPTION I2C-BUS Control The SM5309A uses an I2C BUS interface to set the following functions. 1) Cutoff frequency 2) Input multiplexer selection 3) fc mode switching (1/2 cutoff frequency switching) 4) Filter mode/filter bypass mode switching 5) Input type switching (sync-tip clamp, bias, direct) 6) Power-down function The transfer rate of I2C-BUS corresponds to the fast-mode (up to 400kbit/s). Note that the SM5309A does not support a read function (IC is write only). Basic cycle The basic access cycle comprises the following elements. 1) Start condition 2) 1st byte: Slave address 3) 2nd byte: Subaddress 4) 3rd byte: Control data 5) Stop condition If the input data does not match the slave address or the subaddress is incorrect, the corresponding ACK (acknowledge) bit is not output LOW. However, the ACK bit is output after 3rd byte irrespective of the byte data. Also note that the IC does not support a subaddress auto-increment function, hence each subaddress access requires all the basic cycle steps 1 to 5. I2C-BUS start/stop condition SDA SCL Start condition Stop condition SCL 1 SDA Start Stop 1st byte:Slave address 2nd byte:Subaddress 3rd byte:Control data D7 D6 D1 D0 Low ACK D7 D6 D1 D0 ACK D7 D6 D1 D0 ACK 27 8 9 1 2 7 8 9 1 2 7 8 9 |
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