Rainbow Electronics ATR1841 - Manual (Page 5)

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 0 1 1 1 0 0 R/W = 0 Pin ADS = low (GND)
0 0 1 1 1 0 1 R/W = 0 Pin ADS = high (V
CC
)
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
0 0 Sleep
Table 6-2. Gain Selection Register
g1 g2 g3 g4 g5 g6 Gain
1 1 1 1 1 1 +6 dB
… …
1 0 0 0 0 0 0 dB
… …
0 0 0 0 0 0 –6 dB