UPD17062 datasheet(236/298 Pages) RENESAS

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234

µPD17062

19.2

D/A CONVERTER CONFIGURATION

The D/A converter used in the A/D converter of the

µPD17062 is a resistor string D/A converter consisting

of 16 resistors connected in series between the VDD and GND pins in which a voltage at each resistor connection

point is selected. The configuration of the D/A converter is shown in Fig. 19-2.

Fig. 19-2

D/A Converter Configuration

With the configuration shown above, the D/A converter outputs a ground level when the ADCR is set with

value 0000B. It also outputs 1/32

× VDD when the ADCR is set with 0001B. The following expression represents

the reference voltage VREF that the D/A converter outputs when the ADCR is set with value n (decimal).

VREF = VDD

2n – 1

(where 15

≥ n ≥ 1)

Table 19-1

D/A Converter Reference Voltage

ADCR

Selector

1/2R

3/2R

VDD

D/A output

(reference voltage)

Set data (ADCR)

Reference voltage (VREF)

Hexadecimal

Binary

× VDD

VDD = 5 V

0000

0 [V]

0001

1/32

0.15625

0010

3/32

0.46875

0011

5/32

0.78125

0100

7/32

1.09375

0101

9/32

1.40625

0110

11/32

1.71875

0111

13/32

2.03125

1000

15/32

2.34375

1001

17/32

2.65625

1010

19/32

2.96875

1011

21/32

3.28125

1100

23/32

3.59375

1101

25/32

3.90625

1110

27/32

4.21875

1111

29/32

4.53125

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