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Revision 6.2

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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

9.2.2 P3 (Regulator Enable)

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

VCC is bypassed unregulated to the internal circuits. After a power on, the regulator is on.

9.2.3 P4, P5 (Antenna Rotator/Input Shortcut)

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.

9.3 RSSI Channel Select Register

Table 6. P0, P1, P2 Bit Mode

P0, P1, P2

Mode

0

Channel Disabled

1

Channel Enabled

Table 7. P3 Bit Mode

P3

Mode

0

Regulator Disabled

1

Regulator Enabled

Table 8. P4, P5 Bit Mode

P4

P5

Mode

0

0

Connection Mode1

1

0

Connection Mode2

0

1

Connection Mode3

1

1

Amplifier Inputs Shorted

Table 9. Antenna Rotation Modes

Connection Mode1

Connection Mode2

Connection Mode3

Antenna 1

→ Channel 1

Antenna 2

→ Channel 1

Antenna 3

→ Channel 1

Antenna 2

→ Channel 2

Antenna 3

→ Channel 2

Antenna 1

→ Channel 2

Antenna 3

→ Channel 3

Antenna 1

→ Channel 3

Antenna 2

→ Channel 3

Table 10. Register Data

Bit

POR state

Description

C0

0

RSSI select Bit 1

C1

0

RSSI select Bit 2

C2

0

RSSI output mode Bit 1

C3

0

RSSI output mode Bit 2

C4

0

Channel attenuator

C5

0

WAKE clear