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Registers • 35

4.4 A/D Range Control Register

The A/D range register is used to adjust the analog input ranges for the

A/D channels. Two factor effects the input range: Gain and Polarity. For

the ACL-8112PG, This register controls the PGA (programmable gain)

directly and there is no Unipolar setting. When a different gain value is set,

the analog input range is changed. For the ACL-8112DG/HG, both the

PGA and polarity are controlled by this register. Table 4.2 shows the

relationship between the register data and the A/D input range.

Address : BASE + 9

Attribute: write only

Data Format:

Bit 7 6 5 4 3 2 1 0

BASE+9 X X X X G3 G2 G1 G0

G0~G3: Gain / Range selection, G3 is not used for ACL-8112PG

( This table is only for the ACL-8112HG: High Gain Card)

GAIN

Bipolar

Unipolar

Input Range

0 0 0 0 1 Bipolar

0 0 0 1 10 Bipolar

0.5V

0 0 1 0 100 Bipolar

0.05V

0 0 1 1 1,000 Bipolar

0.005V

0 1 0 0 1 Unipolar 0V ~ 10V

0 1 0 1 10 Unipolar 0V ~ 1V

0 1 1 0 100 Unipolar 0V ~ 0.1V

0 1 1 1 1,000 Unipolar 0V ~ 0.01V

1 0 0 0 0.5 Bipolar

10V

1 0 0 1 5 Bipolar

1 0 1 0 50 Bipolar

0.1V

1 0 1 1 500 Bipolar

0.01V

1 1 0 0 1 Unipolar N/A

1 1 0 1 10 Unipolar N/A

1 1 1 0 100 Unipolar N/A

1 1 1 1 1,000 Unipolar N/A

Table 4.2-1 Function of the Gain Control Bits

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 91 92

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