SI4713 datasheet(21/302 Pages) SILABS

21 / 302 page

AN332

Rev. 1.0

Command 0x32. TX

_TUNE_MEASURE

Enters receive mode (disables transmitter output power) and measures the received noise level (RNL) in units of

dBµV on the selected frequency. The command sets the tuning frequency between 76 and 108 MHz in 10 kHz

units and steps of 50 kHz. For example 76.05 MHz = 7605 is valid because it follows the 50 kHz step requirement

but 76.01 MHz = 7601 is not valid. The command also sets the antenna tuning capacitance. A value of 0 indicates

autotuning, and a value of 1–191 indicates a manual override. The CTS bit (and optional interrupt) is set when it is

safe to send the next command. The ERR bit (and optional interrupt) is set if an invalid argument is sent. Note that

only a single interrupt occurs if both the CTS and ERR bits are set. The optional STC interrupt is set when the

command completes. The STCINT bit is set only after the GET_INT_STATUS command is called. This command

may only be sent when in powerup mode. The command clears the STC bit if it is already set. See Figure 28, “CTS

and STC Timing Model,” on page 226 and Table 45, “Command Timing Parameters for the FM Transmitter,” on

page 227.

Available in: Si4712/13/20/21

Command arguments: Four

Response bytes: None

Command

Response

Bit

D6D5D4D3D2

D1D0

CMD

100

ARG1

000

ARG2

FREQH[7:0]

ARG3

FREQL[7:0]

ARG4

ANTCAP[7:0]

ARG

Bit

Name

Function

7:0

Reserved

Always write to 0.

27:0

FREQH[7:0]

Tune Frequency High Byte.

This byte in combination with FREQL selects the tune frequency in units of

10 kHz. In FM mode the valid range is from 7600 to 10800 (76–108 MHz).

The frequency must be a multiple of 50 kHz.

37:0

FREQL[7:0]

Tune Frequency Low Byte.

This byte in combination with FREQH selects the tune frequency in units of

10 kHz. In FM mode the valid range is from 7600 to 10800 (76–108 MHz).

The frequency must be a multiple of 50 kHz.

7:0

ANTCAP[7:0]

Antenna Tuning Capacitor.

This selects the value of the antenna tuning capacitor manually, or auto-

matic if set to zero. The valid range is 0–191.

Bit

D7D6D5

STATUS

CTS

ERR

RDSINT

ASQINT

STCINT

SI4713 Datasheet(PDF) 21 Page - Silicon Laboratories

SI4713 Datasheet(HTML) 21 Page - Silicon Laboratories

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL