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Registers Format

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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 G1 G0

Where G2, G1, and G0 are Gain selection:

G2 G1 G0 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:

Analog Input Range = Maximum Input Voltage / Gain

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 60 61

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