2.8.4.6 VCO Tuning

The VCO can be tuned during the PollingMode and is optionally selectable for each service/channel configuration. To enable the VCO tuning for a specific service/channel configuration, set the VCOtune bit in the associated pollLoopConf[x].config EEPROM configuration.

Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
pollLoopConf[x].config RfCalib — VCOtune — — — EOL EOP

To force VCO tuning on the first used service/channel configuration regardless of its pollLoopConf setting, activate the VCO_TUNE bit in the sysStartConfig EEPROM setting if the PollingMode is started immediately after power-on, or activate it in the systemModeConfig parameter if using the “Set System Mode” SPI command.

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0x0019 sysStartConfig RF_CAL ANT_TUNE VCO_TUNE IDLEModeSelector — TMDEN OPM[1..0]
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
systemModeConfig RF_CAL ANT_TUNE VCO_TUNE IDLEModeSelector — TMDEN OPM[1:0]

The following table shows the relationship between the bit VCO_TUNE and VCO tuning on the first used service/channel configuration.

Table 2-4. Activation of VCO Tuning in Polling Mode

Bit VCO_TUNE

VCO Tuning During

Polling Array Configuration

Power-on (EEPROM)/ SPI Command

First Polling Cycle

Second - Xth Polling Cycle

First Used Service/Channel Configuration

0

0

— —

0

1

x

—

1

0

x

x

1

1

x

x

Note: Activating the VCO_TUNE bit only affects the mode ramp-up behavior of the first used service/channel configuration during the first polling cycle. This feature is not supported in fastPollingMode.

VCO tuning requires additional time. For more information, see Tune and Check.