SH3100IMTR SEMTECH [Semtech Corporation], SH3100IMTR Datasheet - Page 75

• Manufacturer Part Number: SH3100IMTR
• Description: Supervisory IC with I2C Interface and PWM
• Manufacturer: SEMTECH [Semtech Corporation]

Spectrum Spreading
One other function of the HFDCO is that it has the ability
to implement frequency spreading of the HF clock in order
to reduce EMI radiation. This is achieved by modulating
the LSB bank of the HFDCO using a pseudo random coun-
ter clocked at 32.768kHz. Spread spectrum is enabled by
setting the SSEnable bit and choosing a modulation am-
plitude of 16kHz, 32kHz , 64kHz, or 128kHz depending
on the setting of the 2-bit SS Confi g register.
© 2006 Semtech Corp.
POWER MANAGEMENT
Functional Descriptions
Parameter
Minimum programmable frequency
Maximum programmable frequency
Frequency resolution
Free-running accuracy over 0°C to +70°C
Free-running accuracy over -40°C to +85°C
Free-running accuracy over VDD
Short term frequency stability (jitter)
Startup time from standby
Settling time to 0.1% after HFDCO code
Clock duty cycle
Spread spectrum modulation (min. code)
Spread spectrum modulation (max. code)
(continued)
Min
5
33.5
1.5
-0.5
-1
-0.1
40
± 12
± 96
75
Typ
2
0.1
50
± 16
± 128
Max
8
2.5
+0.5
+1
+0.1
0.2
2
10
60
± 20
± 160
45
Units
MHz
MHz
kHz
%
%
%
%
μs
μs
%
kHz
kHz
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SH3100