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ADC1613D Datasheet(PDF) 24 Page - NXP Semiconductors |
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ADC1613D Datasheet(HTML) 24 Page - NXP Semiconductors |
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24 / 43 page  ADC1613D_SER All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 3 — 9 February 2011 24 of 43 NXP Semiconductors ADC1613D series Dual 16-bit ADC: serial JESD204A interface 11.6 Serial Peripheral Interface (SPI) 11.6.1 Register description The ADC1613D serial interface is a synchronous serial communications port allowing for easy interfacing with many industry microprocessors. It provides access to the registers that control the operation of the chip in both read and write modes. This interface is configured as a 3-wire type (SDIO as bidirectional pin). Pin SCLK acts as the serial clock, and pin CS acts as the serial chip select. Each read/write operation is sequenced by the CS signal and enabled by a LOW level to to drive the chip with 2 bytes to 5 bytes, depending on the content of the instruction byte (see Table 14). [1] R/W indicates whether a read (logic 1) or write (logic 0) transfer occurs after the instruction byte [1] Bits W1 and W0 indicate the number of bytes transferred after the instruction byte. Bits A12 to A0 indicate the address of the register being accessed. In the case of a multiple byte transfer, this address is the first register to be accessed. An address counter is incremented to access subsequent addresses. + 0.99990845 1111 1111 1111 11000111 1111 1111 1100 0 + 0.99993896 1111 1111 1111 1101 0 111 1111 1111 1101 0 + 0.99996948 1111 1111 1111 1110 0 111 1111 1111 1110 0 + 11111 1111 1111 1111 0 111 1111 1111 1111 0 > +11111 1111 1111 1111 0 111 1111 1111 1111 1 Table 13. Output codes versus input voltage …continued INP − INM (V) Offset binary Two’s complement OTR Table 14. SPI instruction bytes MSB LSB Bit 7 6 5 4 3210 Description R/W[1] W1 W0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Table 15. Read or Write mode access description R/W[1] Description 0 Write mode operation 1 Read mode operation Table 16. Number of bytes to be transferred W1 W0 Number of bytes transferred 00 1 byte 01 2 bytes 10 3 bytes 1 1 4 or more bytes |
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