VS1005g Datasheet
10 VS1005 PERIPHERALS AND REGISTERS
ANA_CF0_LCKCHK and ANA_CF0_LCKST are used to poll 2 GHz vco lock status. When
ANA_CF0_LCKCHK is first set and reset the lock status can be read from ANA_CF0_LCKST.
If ANA_CF0_LCKST remains set the 2 GHz vco is locked.
ANA_CF2 Bits
Name Bits Description
15-14 Reserved
ANA_CF2_TSTE
ANA_CF2_VCMST
ANA_CF2_VCMDIS
ANA_CF2_UTMENA
ANA_CF2_LNAPD
ANA_CF2_2GPD
13
12
11
10
9
Hardware debug test enable, read only
Ground buffer short circuit monitor
Ground buffer driver short circuit protection disable
High Speed USB UTM enable
Low Noise Amplifier power down
2 GHz VCO power down
8
ANA_CF2_AMP1PD
ANA_CF2_AMP2PD
7
6
5
Microphone amplifier 1 power down
Microphone amplifier 2 power down
Reserved, use ’0’
ANA_CF2_REF
ANA_CF2_REFPD
ANA_CF2_M3PD
ANA_CF2_M2PD
ANA_CF2_M1PD
4
3
2
1
Analog reference voltage, 1.2V (0) or 1.6V (1)
Analog reference powerdown
ADC 3 power down, active low
ADC 2 power down, active low
ADC 1 power down, active low
0
ANA_CF2 register controls several analog module power downs. The power downs are active
low i.e. the module is enabled when power down register is set.
ANA_CF3 Bits
Name Bits Description
ANA_CF3_480ENA
ANA_CF3_UTMBIAS
15
14
480 MHz clock enable
Usb pad bias enable
ANA_CF3_FMDIV[1:0] 13:12 FM divider selection 16, 20 or 24
ANA_CF3_DIV[1:0] 11:10 VCO divider select register
ANA_CF3_GAIN2[2:0]
ANA_CF3_GAIN1[2:0]
ANA_CF3_2GCNTR[3:0]
9:7
6:4
3:0
ADC 2 gain register
ADC 1 gain register
VCO center frequency register
ANA_CF3_FMDIV is the VCO divider selection register for FM receiver. When the register is
set the VCO clock is divided by 20 (FM mode). When the register is reset the divider value is
16 (HS USB mode). ANA_CF3_FMDIV2 register selects the divider 24. In this divider mode
the ANA_CF3_FMDIV should be set. The VCO frequency is therefore FM tuning frequency
multiplied by 16, 20 or 24.
FM Divider Bits
FMDIV[1] FMDIV[0] Divider Description
1
0
1
0
1
1
0
0
24
24
20
16
FM frequency is VCO frequency divided by 24
Don’t Use (reserved)
FM frequency is VCO frequency divided by 20
FM frequency is VCO frequency divided by 16
Version: 0.2, 2012-03-16
40
ETC [ ETC ]
