User`s guide

Registers Format

•

CL2 is MSB, and CL0 is LSB.

Where CL2, CL1, and CL0 are multiplexer channel selection:

Channel NO.

CL2 CL1 CL0

0 0 0 0 Power Up Setting

1 0 0 1

2 0 1 0

3 0 1 1

4 1 0 0

5 1 0 1

6 1 1 0

7 1 1 1

3.4 A/D Input Range Control Register

The gain control register is a write-only register using address Base

+ 9. It is used to adjust the gain of the analog input programmable

amplifier. The data format is specified as follows:

Address : BASE + 9

Attribute: write only

Data Format:

Bit 7 6 5 4 3 2 1 0

BASE+9 X X X X X G2

Where G2, G1, and G0 are Gain selection:

GAIN Input Range (V)

0 0 0 x1 ± 5V Power Up Setting

0 0 1 x2 ± 2.5V

0 1 0 x4 ± 1.25V

0 1 1 x8 ± 0.625V

1 0 0 x16 ± 0.3125V

1 0 1 Invalid X

1 1 0 Invalid X

1 1 1 Invalid X

The relationship between input voltage range, maximum input

voltage and gain is specified as the equation: