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CY25823
Document #: 38-07579 Rev. *C
Page 4 of 12
2
0
Reserved must equal 0
1
1
11, 12
Spread Enable
Spread spectrum enable, 0 = Disable, 1 = Enable
0
0
HW/SW Control
Hardware/software control of S[3:0], and output frequency.
0 = hardware control, 1= software control.
Table 4. Spread Spectrum Select (Charge Pump = 00 or Default Condition)
SS3
SS2
SS1
SS0
Spread Mode
Spread Amount %
0
0
0
0
Down
0.65
0
0
0
1
Down
0.80
0
0
1
0
Down
0.90
0
0
1
1
Down
1.10
0
1
0
0
Down
1.30
0
1
0
1
Down
1.40
0
1
1
0
Down
1.80
0
1
1
1
Down
2.25
1
0
0
0
Center
±0.25
1
0
0
1
Center
±0.30
1
0
1
0
Center
±0.40
1
0
1
1
Center
±0.45
1
1
0
0
Center
±0.60
1
1
0
1
Center
±0.80
1
1
1
0
Center
±1.00
1
1
1
1
Center
±1.10
Table 5. Spread Spectrum Select (Charge Pump = 11 and 01)
SS3
SS2
SS1
SS0
Spread Mode
Spread Amount %
(Charge pump = 11)
Spread Amount %
(Charge pump = 01)
0
0
0
0
Down
0.80
0.90
0
0
0
1
Down
0.90
1.10
0
0
1
0
Down
1.20
1.40
0
0
1
1
Down
1.40
1.60
0
1
0
0
Down
1.60
2.00
0
1
0
1
Down
1.75
2.20
0
1
1
0
Down
2.20
2.75
0
1
1
1
Down
2.60
3.30
1
0
0
0
Center
±0.38
±0.40
1
0
0
1
Center
±0.40
±0.50
1
0
1
0
Center
±0.50
±0.60
1
0
1
1
Center
±0.60
±0.70
1
1
0
0
Center
±0.75
±0.90
1
1
0
1
Center
±1.00
±1.25
1
1
1
0
Center
±1.15
±1.45
1
1
1
1
Center
±1.30
±1.65
Byte 0: Control Register (continued)
Bit
@Power-up
Pin#
Name
Pin Description
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