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TLC5617 Datasheet(PDF) 13 Page - Texas Instruments |
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TLC5617 Datasheet(HTML) 13 Page - Texas Instruments |
13 / 21 page TLC5617, TLC5617A PROGRAMMABLE DUAL 10-BIT DIGITAL-TO-ANALOG CONVERTERS SLAS151B – JULY 1997 – REVISED MARCH 2000 13 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION serial interface When chip select (CS) is low, the input data is read into a 16-bit shift register with the input data clocked in most significant bit first. The falling edge of the SCLK input shifts the data into the input register. The rising edge of CS then transfers the data to the DAC register. All CS transitions should occur when the SCLK input is low. The 16 bits of data can be transferred with the sequence shown in Figure 18. D15 D14 D13 D12 D11 10 Data Bits D2 D1 = x D0 = x Program Bits Data Bits Fill Bits† 16 Bits MSB (Input Word) MSB (Data) LSB (Data) LSB (Input Word) † Two extra (sub-LSB) bits (can be don’t care) Figure 18. Input Data Word Format Table 2 shows the function of program bits D15 – D12. Table 2. Program Bits D15 – D12 Function PROGRAM BIT DEVICE FUNCTION D15 D14 D13 D12 DEVICE FUNCTION 1 X X X Write to latch A with serial interface register data 1 X X X g and latch B updated with buffer latch data 0 X X 0 Write to latch B and double buffer latch 0 X X 1 Write to double buffer latch only X 1 X X 12.5 µs settling time X 0 X X 2.5 µs settling time X X 0 X Powered-up operation X X 1 X Powered-down mode function of the latch control bits (D15 and D12) Three data transfers are possible. All transfers occur immediately after CS goes high and are described in the following sections. latch A write, latch B update (D15 = high, D12 = X) The serial interface register (SIR) data are written to latch A and the double buffer latch contents are written to latch B. The double buffer contents are unaffected. This control bit condition allows simultaneous output updates of both DACs. Serial Interface Register D12 = X D15 = High Latch A Latch B Double Buffer Latch To DAC A To DAC B Figure 19. Latch A Write, Latch B Update |
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