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AS1116-BSST Datasheet(PDF) 10 Page - ams AG |
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AS1116-BSST Datasheet(HTML) 10 Page - ams AG |
10 / 24 page www.austriamicrosystems.com/LED-Driver-ICs/AS1116 Revision 1.08 9 - 23 AS1116 Datasheet - D e t a i l e d D e s c r i p t i o n Serial Interface The AS1116 contains a 16bit SPI interface to access the internal data and control registers of the device (see Digit- and Control-Registers on page 11) . The SPI interface is driven with the rising edge of SCL. A falling edge on LD signal indicates the beginning of an access on the SPI interface, the rising edge on LD determines an access on SPI. An access must consist of exactly 16bits for write operation and 8bits for read operation. Timing restrictions on the SPI interface pins are defined in Figure 19. Table 6 shows the structure of the 16bit command word for writing data. The bits D0 to D7 are the data information, bits D8 to D12 are the address bits, D13 is set to ‘0’, bit D14 is defining the read (D14 = ‘1’) or the write (D14 = ‘0’) configuration and bit D15 is a don’t care bit. In Table 7 on page 11 the 8bit command word for the read operation can be found. Bit D0 (write operation) or bit D8 (read operation) is the first bit to shift into the SPI interface after the falling edge of LD. Bit D15 is the last bit to write to SPI before rising edge of LD. At a read operation an 8bit operation is executed (see Figure 18). At the first rising edge of SCL after the rising edge of LD D7 of addressed register is written to SDO pin. At the next rising edge of SCL D6 is written to SDO pin. LD must be kept high during reading data from a internal data or control register of AS1116. Figure 17. Write operation Figure 18. Read operation Table 6. 16-Bit Serial Data Format D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 LSB Data MSB Register Address (see Table 7) 0 R/W X 1 9 8 16 D3 D4 D5 D6 D7 D1 D2 D0 SCL LD SDI D11 D12 D13 D14 D15 D9 D10 D8 SDO D3 D4 D5 D6 D7 D1 D2 D0 D11 D12 D13 D14 D15 D9 D10 D8 1 9 8 16 D11 D12 D13 D14 D15 D9 D10 D8 SCL LD SDI D4 D3 D2 D1 D0 D6 D5 D7 SDO |
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