Renesas PCA4738L-64A Información técnica descargar pdf (Pagina 30)

MITSUBISHI MICROCOMPUTERS

3802 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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

1 or DA2 pin by setting the DA output enable bit to “1”.

When using the D-A converter, the corresponding port direction

0/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 = V

REF ✕ n/256 (n = 0 to 255)

Where V

REF 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 P3

0/DA1 and P31/

2 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 V

CC to 3.0 V or more when using the D-A converter.

Fig. 24 Block diagram of D-A converter

Fig. 25 Equivalent connection circuit of D-A converter

/DA

D-A1 conversion register (8)

R-2R resistor ladder

output enable bit

/DA

D-A2 conversion register (8)

R-2R resistor ladder

output enable bit

Data bus

REF

"0"

"1"

MSB

"0"

"1"

2R 2R

LSB

/DA1

D-A1

conversion

output enable bit

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 53 54

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Renesas PCA4738L-64A Información técnica Pagina 30

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