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M38022E4-384SS Datasheet(PDF) 46 Page - Mitsubishi Electric Semiconductor |
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M38022E4-384SS Datasheet(HTML) 46 Page - Mitsubishi Electric Semiconductor |
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46 / 207 page  1-31 HARDWARE 3802 GROUP USER’S MANUAL D-A Converter The 3802 group has two internal D-A converters (DA1 and DA2) with 8-bit resolutions. The D-A converter is performed by setting the value in the D-A conversion register. The result of D-A converter is output from the DA1 or DA2 pin by setting the DA output enable bit to “1”. When using the D-A converter, the corresponding port direction register bit (P30/DA1 or P31/DA2) should be set to “0” (input sta- tus). The output analog voltage V is determined by the value n (base 10) in the D-A conversion register as follows: V = VREF ! n/256 (n = 0 to 255) Where VREF is the reference voltage. At reset, the D-A conversion registers are cleared to “0016”, the DA output enable bits are cleared to “0”, and the P30/DA1 and P31/ DA2 pins are set to input (high impedance). The D-A output is not buffered, so connect an external buffer when driving a low-impedance load. Set VCC to 3.0 V or more when using the D-A converter. Fig. 32 Block diagram of D-A converter Fig. 33 Equivalent connection circuit of D-A converter P30/DA1 D-A1 conversion register (8) R-2R resistor ladder DA1 output enable bit P31/DA2 D-A2 conversion register (8) R-2R resistor ladder DA2 output enable bit FUNCTIONAL DESCRIPTION AVSS VREF "0" "1" MSB "0" "1" R 2R R 2R R 2R R 2R R 2R R 2R R 2R 2R LSB 2R P30/DA1 D-A1 conversion register DA1 output enable bit |
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