AS3931 View Datasheet(PDF) - austriamicrosystems AG
Part Name
Description
Manufacturer
AS3931 Datasheet PDF : 31 Pages
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AS3931
Datasheet - Configuring the Product
9 Configuring the Product
9.1 Serial Programming Interface
The AS3931 is programmed via an unidirectional three wire Serial Programming Interface.The 3 lines are:
CS: Chip Select, used for selecting AS3931 and for data latching
SCL: Serial Clock
SDA: Serial Data
lid A block of 8 bit data starting with the LSB is sent according to the diagram shown in Figure 19. The received block of 8 bit data is shifted into an
8 bit latch. The two LSBs are register address bits and the remaining 6 bits are data bits. The register address bits A1 and A0 are decoded and
the 6 data bits are stored into one of three 6 bit registers with the falling edge of CS.
a Figure 19. Protocol of 8 Bit Data Serial Transmission
v CS
ill SDA
ADDRESS
DATA
A0
A1
D0
D1
D2
D3
D4
D5
G st SCL
A t D =P : POWER ON REGISTER
D =C : CHANNEL SELECT REGISTER
s n D =T :TEST MODE REGISTER
e D = M: CORRELATOR MODE REGISTER
m t 9.2 Power On Register
a n Table 4. Register Data
o Bit
c P0
P1
l P2
a P3
ic P4
P5
n Table 5. Register Address
h Bit
A0
Tec A1
POR state
1
1
1
1
0
0
Description
Enable Channel 1
Enable Channel 2
Enable Channel 3
Enable Regulator
Antenna Rotator Bit 1
Antenna Rotator Bit 2
Value
0
0
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