SH3000EK SEMTECH [Semtech Corporation], SH3000EK Datasheet - Page 9

• Manufacturer Part Number: SH3000EK
• Description: Reset Management and Clock Management Support IC for Microcontrollers
• Manufacturer: SEMTECH [Semtech Corporation]

Low Frequency (LF) Oscillator System
circuits and to the dedicated output pin, CLK32.
operations when V
available.
default calibration values for the RC oscillator are loaded
on power-up from the factory-programmed nonvolatile
memory. They can be re-programmed at any time or
they can be permanently protected from any changes by
setting the Lock flag or a write-protect flag. Factory
calibration brings the frequency of the RC oscillator
within ±3 % of the 32768 Hz for the internal reference
resistor, and ± 2% for the external 1 MΩ 1% resistor,
over the entire temperature and supply voltage range.
modulated by varying the external reference resistor,
which should be located as close as possible to R
pin 9.
Copyright ©2002-2005 Semtech Corporation
SYSTEM MANAGEMENT
1 MΩ 1% or
Reference
External
Resistor
variable
This module provides the 32 kHz clock to all internal
If enabled, the CLK32 output continues normal
Just like the V
The frequency of the RC oscillator can be tuned or
BO
DD
R
V
V
REF
SS
SS
9
8
1
value for the Reset circuit, the
is absent and backup power is
Lock / Unlock
Logic
Figure 5. Simplified LF Oscillator System
4-bit Value
REF
,
6-bit Value
I
R
NTERNAL
REF
9
O
N
4-bit Value
Oscillator
RC
Internal R
Lock Logic
REF
SH3002 MicroBuddy™
V1.20
CLK32 O
32.768 kHz
Internal
From / To
Serial I/O
Clock
www.semtech.com
N
CLK32
13