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3.7.1
Spread spectrum modulation (SSM)
STPM098C clock generator implements a frequency modulation (spread spectrum modulation) feature to reduce
the main logic emissions around the main frequency by spreading the power spectrum over a larger frequency
range.
Figure 33. Clock spread spectrum modulation details
f
0.5/fm
1/fm
t
(1+δ)fc
(1-δ)fc
fc
The carrier frequency fc (typ = 40 MHz) is modulated by means of a triangular modulating signal with frequency
fm and a spreading range δ.
Table 31. Clock spread spectrum electrical characteristics
Symbol
Parameter
Test condition Min Typ Max Unit
Notes
SSM_spreading
Spread spectrum modulation spreading
range
1.5
-
3
%
Application information
SSM_freq
Spread spectrum modulating frequency
9.7
-
39
kHz Application information
The clock spread spectrum modulation function can be enabled by a dedicated PMBus™ bit as follows:
Table 32. Clock spread spectrum enable bit
CLK_SSM_EN
Description
0
Clock SSM disabled (default)
1
Clock SSM enabled
Note:
•
When the clock spread spectrum is enabled, the internal digital timings are affected by a timing jitter equal
to the selected spread spectrum spreading range.
•
ICM timeout accuracy is valid only in case of sudden stuck fault. In case of progressive clock frequency
degradation, such an accuracy range is no more valid.
•
If no oscillator clock is available, the PMBus™ data processing cannot work properly: STPM098C delivers
always the latest answer.
STPM098C
Functional description
DS14440 - Rev 1
page 41/110



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