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CDCM6208V1FRGZR Datasheet(PDF) 39 Page - Texas Instruments |
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CDCM6208V1FRGZR Datasheet(HTML) 39 Page - Texas Instruments |
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39 / 87 page  SCS SCL SCI WRITE READ SCI SCO HI-Z 16-BIT COMMAND 16-BIT DATA '21¶7&$5( A31 A30 A29 A28 A27 A26 A25 A24 A23 A22 A21 A20 A19 A18 A17 A16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 A16 A17 A18 A19 A20 A21 A22 A23 A24 A25 A26 A27 A28 A29 A30 A31 CDCM6208 SDO (#34) Data out SCS (#37) LVCMOS & 0 0 0 SDO internal enable signal CDCM6208V1F www.ti.com SCAS943 – MAY 2015 Programming (continued) 10.5.2 Reading from the CDCM6208V1F As with the write operation, the host first initiates a SPI transfer by asserting the SCS pin low. The host signals a read operation by shifting a logical high in the first bit position, signaling the CDCM6208V1F that the host is imitating a read data transfer from the device. During the portion of the message in which the host specifies the CDCM6208V1F register address, the host presents this information on the SDI pin of the device (for the first 15 clock cycles after the W/R bit). During the 16 clock cycles that follow, the CDCM6208V1F presents the data from the register specified in the first half of the message on the SDO pin. The SDO output is 3-stated anytime SCS is high, so that multiple SPI slave devices can be connected to the same serial bus. The host signals the CDCM6208V1F that the transfer is complete by de-asserting the SCS pin high. Figure 31. 10.5.3 Block Write/Read Operation The device supports a block write and block read operation. The host need only specify the lowest address of the sequence of addresses that the host needs to access. The CDCM6208V1F will automatically increment the internal register address pointer if the SCS pin remains low after the SPI port finishes the initial 32-bit transmission sequence. Each transmission of 16 bits (a data payload width) results in the device automatically incrementing the address pointer (provided the SCS pin remains active low for all sequences). Figure 32. CDCM6208V1F SPI Port Message Sequencing 10.5.4 I2C Serial Interface With SI_MODE1=0 and SI_MODE0=1 the CDCM6208V1F enters I 2C mode. The I2C port on the CDCM6208V1F works as a slave device and supports both the 100 kHz standard mode and 400 kHz fast mode operations. Fast mode imposes a glitch tolerance requirement on the control signals. Therefore, the input receivers ignore pulses of less than 50 ns duration. The inputs of the device also incorporates a Schmitt trigger at the SDA and SCL inputs to provide receiver input hysteresis for increased noise robustness. NOTE Communication through I2C is not possible while RESETN is held low. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 39 Product Folder Links: CDCM6208V1F |
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