CYRF69213_13 Datasheet, PDF (28/86 Pages) Cypress Semiconductor – Programmable Radio on Chip Low Power

CYRF69213
Table 35. IOSC Trim (IOSCTR) [0x34] [R/W]
Bit #
7
6
5
4
3
2
1
0
Field
foffset[2:0]
Gain[4:0]
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
D
D
D
D
D
The I/OSC Calibrate register is used to calibrate the internal oscillator. The reset value is undefined, but during boot the SROM
writes a calibration value that is determined during manufacturing test. This value should not require change during normal use.
This is the meaning of ‘D’ in the Default field
Bits 7:5 foffset [2:0]
This value is used to trim the frequency of the internal oscillator. These bits are not used in factory calibration and is zero. Setting
each of these bits causes the appropriate fine offset in oscillator frequency
foffset bit 0 = 7.5 kHz
foffset bit 1 = 15 kHz
foffset bit 2 = 30 kHz
Bits 4:0 Gain [4:0]
The effective frequency change of the offset input is controlled through the gain input. A lower value of the gain setting increases
the gain of the offset input. This value sets the size of each offset step for the internal oscillator. Nominal gain change (KHz/off-
setStep) at each bit, typical conditions (24 MHz operation):
Gain bit 0 = –1.5 kHz
Gain bit 1 = –3.0 kHz
Gain bit 2 = –6 kHz
Gain bit 3 = –12 kHz
Gain bit 4 = –24 kHz
Table 36. LPOSC Trim (LPOSCTR) [0x36] [R/W]
Bit #
7
6
5
4
3
2
1
0
Field
32 kHz Low Reserved
Power
32 kHz Bias Trim [1:0]
32 kHz Freq Trim [3:0]
Read/Write
R/W
–
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
D
D
D
D
D
D
D
This register is used to calibrate the 32 kHz Low speed Oscillator. The reset value is undefined, but during boot the SROM writes
a calibration value that is determined during manufacturing test. This value should not require change during normal use. This is
the meaning of ‘D’ in the Default field. If the 32 kHz Low power bit needs to be written, care should be taken not to disturb the 32
kHz Bias Trim and the 32 kHz Freq Trim fields from their factory calibrated values
Bit 7
32 kHz Low Power
0 = The 32 kHz Low speed Oscillator operates in normal mode
1 = The 32 kHz Low speed Oscillator operates in a low power mode. The oscillator continues to function normally but with re-
duced accuracy
Bit 6
Reserved
Bits 5:4 32 kHz Bias Trim [1:0]
These bits control the bias current of the low power oscillator.
0 0 = Mid bias
0 1 = High bias
1 0 = Reserved
1 1 = Reserved
Important Note Do not program the 32 kHz Bias Trim [1:0] field with the reserved 10b value, as the oscillator does not oscillate at
all corner conditions with this setting
Bits 3:0 32 kHz Freq Trim [3:0]
These bits are used to trim the frequency of the low power oscillator
Document Number: 001-07552 Rev. *H
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