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CS5525-AP Datasheet(PDF) 11 Page - Cirrus Logic |
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CS5525-AP Datasheet(HTML) 11 Page - Cirrus Logic |
11 / 29 page CS5525 CS5526 DS202F3 11 Reading/Writing On-Chip Registers The CS5525/26’s offset, gain, and configuration registers are read/writable while the conversion data register is read only. To perform a read from a specific register, the R/W bit of the command word must be a logic 1. The SC, CC, and PS/R bits must be logic 0 and the CB (MSB) bit must be a logic 1. The register to be writ- ten is selected with the RSB2-RSB0 bits of the command word. To perform a write to a specific register, the R/W bit of the command word must be a logic 0. The SC, CC, and PS/R bits must be logic 0 and the CB (MSB) bit must be a logic 1. The register to be written is se- lected with the RSB2-RSB0 bits of the command word. Figure 6 illustrates the serial sequence neces- sary to write to, or read from the serial port. If the Set-up Registers are chosen with the RSB2- RSB0 bits, the registers are read or written in the following sequence: Offset, Gain and Configura- tion. This is accomplished by following one 8-bit command word with three 24-bit data words for a total of 72 data bits. Command Register D7(MSB) D6D5D4 D3D2D1D0 CB SC CC R/W RSB2 RSB1 RSB0 PS/R BIT NAME VALUE FUNCTION D7 Command Bit, CB 0 1 Null command (no operation). All command bits, including CB must be 0. Logic 1 for executable commands. D6 Single Conversion, SC 0 1 Single Conversion not active. Perform a conversion. D5 Continuous Conversions, CC 0 1 Continuous Conversions not active. Perform conversions continuously. D4 Read/Write, R/W 0 1 Write to selected register. Read from selected register. D3-D1 Register Select Bit, RSB2-RSB0 000 001 010 011 100 101 110 111 Offset Register Gain Register Configuration Register Conversion Data Register (read only) Set-up Registers (Offset, Gain, Configuration) Reserved Reserved Reserved D0 Power Save/Run, PS/R 0 1 Run Power Save Table 1. Command Set |
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