M38039G8HKP datasheet(60/92 Pages) RENESAS

60 / 92 page

Rev.1.10

Nov 14, 2005

Page 60 of 91

REJ03B0166-0110

3803 Group (Spec.H QzROM version)

PRELIMINARY

Notice: This is not a final specification.

Some parametric limits are subject to change.

D/A CONVERTER

The 3803 group (Spec.H QzROM version) has two internal D/A

converters (DA1 and DA2) with 8-bit resolution.

The D/A conversion is performed by setting the value in each

DA conversion register. The result of D/A conversion 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

status).

The output analog voltage V is determined by the value n

(decimal notation) in the DA conversion register as follows:

V = VREF× n/256 (n = 0 to 255)

Where VREF is the reference voltage.

At reset, the DA conversion registers are cleared to “0016”, and

the DA output enable bits are cleared to “0”, and the P30/DA1

and P31/DA2 pins become high impedance.

The DA output does not have buffers. Accordingly, connect an

external buffer when driving a low-impedance load.

Fig 52. Block diagram of D/A converter

Fig 53. Equivalent connection circuit of D/A converter (DA1)

DA1 conversion register (8)

DA1 output enable bit

P30/DA1

R-2R resistor ladder

DA2 conversion register (8)

DA2 output enable bit

P31/DA2

R-2R resistor ladder

DA1 output enable bit

AVSS

VREF

LSB

“1”

“0”

MSB

DA1 conversion register

P30/DA1

“0”

“1”

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