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CS5529 Datasheet(PDF) 11 Page - Cirrus Logic |
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CS5529 Datasheet(HTML) 11 Page - Cirrus Logic |
11 / 31 page CS5529 DS246F5 11 ages. The differential voltage between VREF+ and VREF- sets the nominal full scale input span of the converter. For a single-ended reference voltage, such as the LT1019-2.5, the reference output is connected to the VREF+ pin of the CS5529 and the ground reference for the LT1019-2.5 is connected to the VREF- pin. Serial Port The CS5529 includes a microcontroller with a command register, a configuration register, a con- version data register (read only), and a gain and off- set register for calibration. All registers, except the 8-bit command register, are 24-bits in length. Fig- ure 3 illustrates a block diagram of all the internal register. After a system initialization or reset, the serial port is set to the command mode. The converter stays in this mode until a valid 8-bit command is received (the first 8-bits into the serial port). Once a valid 8- bit command is received and interpreted by the ADC’s command register, the serial port enters the data mode. In data mode the next 24 serial clock pulses shift data either into or out of the serial port (72 serial clock pulses are needed if the setup reg- ister command is issued). The Command Register Descriptions section illustrates all valid com- mands. AIN C = 20pF f = 32.768 kHz φ Coarse 1 φ Fine 1 V ≤ 25mV i = fV C os os n Figure 1. Input models for AIN+ and AIN- pins. VREF C = 10pF f = 32.768 kHz 2 φ Fine 1 V ≤ 25mV i = fV C os os n φ Coarse Figure 2. Input model for VREF+ and VREF- pins. Latch Outputs Low Power Mode Output Word Rates Unipolar/Bipolar Reset System etc. Configuration Register (1 × 24) Serial Interface CS SDI SDO SCLK Command Register (1 × 8) Conversion Data Register (1x24) Gain Register (1 × 24) Offset Register (1 × 24) Figure 3. CS5529 Register Diagram. |
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