L9662 datasheet(73/80 Pages) STMICROELECTRONICS

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L9662

Functional description

Bits [D5:D4].

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

decoders to be commanded on or off according to the following table.

If both the satellite and decoder are to be enabled then the channel

needs to be enabled first and in a following command the decoder

would be enabled. This is to prevent erroneous/spurious data to be

read.

Bit D3

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 [D2:D0]

These bits program the threshold for the current demodulation affecting

each individual channel. The current ranges supported are showed in

table below.

Table 43. Default speed

Guaranteed frequency operating range

(kHz)

62.66 to 238.66 (default)

43.50 to 158.97

26.32 to 106.04

13.3 to 51.25

Table 44. On/off condition for satellite and decoder

Definition

SPI DATA Register (For appropriate wordx)

Satellite

Decoder

ICH0/ICH1

ICH2/ICH3

OFF (default)

Empty

See Table 33

OFF

Data will reflect if ICHx

current is above/below

threshold setting (1)

D0 = 0 (above thres.)

D0 = 1 (below thres.)

Sat. Data

OFF

Empty

Table 45. Current range supported

Current Threshold (mA)

min/max

1.0/4.0(default)

8.0/11.0

14.85/18.15

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