AS3931 View Datasheet(PDF) - austriamicrosystems AG
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AS3931 Datasheet PDF : 31 Pages
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AS3931
Datasheet - Configuring the Product
9.2.1 P0, P1, P2 (Channel Enable)
If the bit P0, P1 or P2 is set to 1, the related channel is enabled. That means, the logarithmic envelope amplifier and the correlator are enabled
and ready to receive a Wake Up Frame. When disabled, the channel is off, taking no current except for the bias cell to the amplifier. After a power
on, all channels are enabled.
Note: Shaded cells show POR-states
Table 6. P0, P1, P2 Bit Mode
P0, P1, P2
0
lid 1
Mode
Channel Disabled
Channel Enabled
9.2.2 P3 (Regulator Enable)
a Bit P3 enables the regulator (VREG 2.4 V) or switches off the regulator (VREG = VCC). If the regulator is switched off, then the voltage at Pin
v VCC is bypassed unregulated to the internal circuits. After a power on, the regulator is on.
Table 7. P3 Bit Mode
ill P3
Mode
0
Regulator Disabled
t 1
Regulator Enabled
G s 9.2.3 P4, P5 (Antenna Rotator/Input Shortcut)
A t Bits P4 and P5 are used to set the Antenna Connection Mode or to shortcut the differential inputs of each amplifier. See Table 28 for the
description of the rotator modes.
s n Table 8. P4, P5 Bit Mode
e P4
P5
Mode
m t 0
0
Connection Mode1
1
0
Connection Mode2
a n 0
1
Connection Mode3
o 1
1
Amplifier Inputs Shorted
c Table 9. Antenna Rotation Modes
l Connection Mode1
Antenna 1 → Channel 1
a Antenna 2 → Channel 2
ic Antenna 3 → Channel 3
Connection Mode2
Antenna 2 → Channel 1
Antenna 3 → Channel 2
Antenna 1 → Channel 3
Connection Mode3
Antenna 3 → Channel 1
Antenna 1 → Channel 2
Antenna 2 → Channel 3
n 9.3 RSSI Channel Select Register
Table 10. Register Data
hBit
cC0
e C1
T C2
POR state
0
0
0
Description
RSSI select Bit 1
RSSI select Bit 2
RSSI output mode Bit 1
C3
0
RSSI output mode Bit 2
C4
0
Channel attenuator
C5
0
WAKE clear
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