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X9530 Datasheet(PDF) 11 Page - Intersil Corporation |
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X9530 Datasheet(HTML) 11 Page - Intersil Corporation |
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11 / 28 page  11 FN8211.1 November 11, 2005 By examining the block diagram in Figure 5, we see that the maximum current through pin I1 is set by fixing values for V(VRef) and R1. The output current can then be varied by changing the data byte at the D/A converter input. In general, the magnitude of the current at the D/A converter output pins (I1, I2) may be calculated by: Ix = (V(VRef) / (384 • Rx)) • N where x = 1,2 and N is the decimal representation of the input byte to the corresponding D/A converter. The value for the resistor Rx (x = 1,2) determines the full scale output current that the D/A converter may sink or source. The full scale output current has a maximum value of ±1.6 mA, which is obtained using a resistance of 510 Ω for Rx. This resistance may be connected externally to pin Rx of the X9530, or may be selected from one of three internal values. Bits I1FSO1 and I1FSO0 select the full scale output current setting for I1 as described in “I1FSO1 - I1FSO0: Current Generator 1 Full Scale Output Set Bits (Non-volatile)” on page 6. Bits I2FSO1 and I2FSO0 select the maximum current setting for I2 as described in “I2FSO1–I2FSO0: Current Generator 2 Full Scale Output Current Set Bits (Non-volatile)” on page 7. When an internal resistor is selected for R1 or R2, then no resistor should be connected externally at the corresponding pin. Bits I1DS and I2DS in Control Register 0 select the direction of the currents through pins I1 and I2 independently (See “I1DS: Current Generator 1 Direction Select Bit (Non-volatile)” on page 4 and “Control and Status Register Format” on page 5). D/A Converter Output Current Response When the D/A converter input data byte changes by an arbitrary number of bits, the output current changes from an intial current level (Ix) to some final level (Ix + ΔIx). The transition is monotonic and glitchless. D/A Converter Control The data byte inputs of the D/A converters can be controlled in three ways: – 1) With the A/D converter and through the look-up tables (default), – 2) Bypassing the A/D converter and directly access- ing the look-up tables, – 3) Bypassing both the A/D converter and look-up tables, and directly setting the D/A converter input byte. The options are summarized in the following tables: D1 D0 Select ADC AD[5:0] LUT1 Row LUT2 Row Out D1 D0 Select Voltage Voltage Input Selection bits Selection bits Reference Out L2DA[5:0]: Control Register 2 L1DA[5:0]: Control Register 1 L2DAS: bit 6 in Control register 5 L1DAS: bit 4 in Control register 5 6 6 Status Register Figure 7. Look-Up Table Addressing X9530 |
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