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TLE9461ES Datasheet(PDF) 43 Page - Infineon Technologies AG

Part # TLE9461ES
Description  Lite CAN SBC Family
PDF  140 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLE9461ES Datasheet(HTML) 43 Page - Infineon Technologies AG

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TLE9461ES
Lite CAN SBC Family
System Features
Datasheet
43
Rev.1.1
2019-09-27
5.5
Spread Spectrum Modulation Frequency Function
The spread spectrum modulation frequency function can be used to reduce electromagnetic emissions for
the charge pump.
The spread spectrum function can be enabled and configured by the bits SS_MOD_FR.
The spread spectrum function is derived from the internal 2MHz oscillator (~0.5µs period). The calculations
below are applied to the 2.0MHz setting (2MHZ_FREQ = ‘001’ (for all the other frequencies the values can be
derived).
There is a counter adjusting the oscillator step values up and down. There is a maximum of 32 steps for the
counter available. For the frequency range 2MHZ_FREQ = ‘0xx’ we can choose following modulation
frequencies:
Table 13
Deriving the Modulation Frequency Steps
Setting
Periods / Step Width
Typ. Resulting Period
Typ. Modulation Frequency
SS_MOD_FR = ‘11’ 0.5us / 1 period of 0.5us
16us
1/16us = 62.5 kHz
SS_MOD_FR = ‘10’ 1.0us / 2 periods of 0.5us
32us
1/32us = 31.25 kHz
SS_MOD_FR = ‘01’ 2.0us / 4 periods of 0.5us
64us
1/64us = 15.625 kHz



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