L9654 datasheet(52/59 Pages) STMICROELECTRONICS

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Functional description

L9654

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DocID14218 Rev 3

Bits[2:0]

These bits program the threshold for the current demodulation affecting each individual

channel. The current ranges supported are given in Table 36.

Table 36. Current ranges supported are given in following table

Bit D2

Bit D1

Bit D0

Current Threshold (mA)

16.50(default)

19.00

22.50

26.50

32.00

39.00

48.50

60.00

All incoming satellite signals are processed through deglitch filter before reaching the

decoder. D3 enables a hysteresis around the current threshold for added noise immunity.

Bits[5:4]

These bits are used to enable the satellite channels and the internal decoders to be

commanded on or off according to the following table. The suggested sequence to avoid

spurious error code inside FIFO is to switch on the channel first, and enable decoder only

once satellite is powered.

Table 37. Satellite/decoder control

Bit D5

Bit D4

Definition

Satellite

Decoder

OFF (default)

OFF

Bits[7:6]

These bits are used to configure the number of bits in the "B" protocol data field. For these

bits to execute on any given channel, the channel has to be configured for "B" protocol

through bits <11:8> in the MCR register.

Current Trip Point threshold (refer to Table 36)

Table 35. Channel configuration register definition

Bit

State

Description

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