AS3931 View Datasheet(PDF) - austriamicrosystems AG
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Description
Manufacturer
AS3931 Datasheet PDF : 31 Pages
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AS3931
Datasheet - Configuring the Product
Table 11. Register Address
Bit
A0
A1
Value
1
0
9.3.1 C0, C1 (RSSI Channel Select)
Bits C0 and C1 are used to select the channel whose RSSI signal is multiplexed to the RSSI pin. In case of both bits C0 and C1 set to 1, a
bandgap voltage VBG (1.25 V) appears at the RSSI pin. After power on, channel 1 is selected.
lid Table 12. C0, C1 Bit Mode
C0
C1
Mode
0
0
Channel 1
a 1
0
Channel 2
v 0
1
Channel 3
ill 1
1
VBG (T0=0), WAKE (T0=1)
9.3.2 C2, C3 (RSSI Output Mode)
t Bits C2 and C3 define the RSSI pin function.
G s Table 13. C2, C3 Bit Mode
C2
A t 0
s n 1
e 0
m t 1
C3
RSSI Pin Function
0
high Z
0
Analog output: RSSI of selected channel or
VBG
1
Digital output: WAKE,
single WAKE or DATA
1
not used
a n Note: The RSSI pin function also depends on the signal CS. If CS = 0, the RSSI pin is always in the high impedance state. This is also the
o case after power on.
c The WAKE or single WAKE function is selected together with bits T0 – T2 and C0 – C1. For more information see Extended Operation
on page 24
l 9.3.3 C4 (Channel Attenuator)
a When bit C4 is set, a resistor (app. 1.5 kΩ) is connected across the differential inputs of each channel. This resistor reduces the Q-factor of the
antenna resonant circuit; therefore the received signal is reduced too. The amount of damping depends on the Q-factor of the antenna circuit.
ic Table 14. C4 Bit Mode
C4
Mode
n0
Input attenuators disabled
Tech 1
Input attenuators enabled
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Revision 6.2
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