Rainbow-electronics ATR1841 Manuel d'utilisateur télécharger pdf (Page 5)

9103AS–DVD–08/07

ATR1841 [Preliminary]

6. Two-wire Interface (TWI)

6.1 Slave Address

6.2 Data

6.3 Mode Setting

The first two bits select the mode/gain level.

6.4 Gain Setting

The last six bits are used to finely adjust the gain by ±6 dB

MSB (ADS) LSB

0 01110 0 R/W = 0 Pin ADS = low (GND)

0 01110 1 R/W = 0 Pin ADS = high (V

)

MSB LSB

m1 m2 g1 g2 g3 g4 g5 g6

Table 6-1. Mode Selection Register

m1 m2 Mode Select

1 1 High gain

1 0 Middle gain

0 1 Low gain

00 Sleep

Table 6-2. Gain Selection Register

g1 g2 g3 g4 g5 g6 Gain

111111 +6dB

……

100000 0dB

……

000000 –6dB

1 2 3 4 5 6 7 8

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Rainbow-electronics ATR1841 Manuel d'utilisateur Page 5