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TS3005ITD1033T Fiches technique(PDF) 9 Page - Silicon Laboratories

No de pièce TS3005ITD1033T
Description  Single Resistor Sets Output Frequency
Download  12 Pages
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Fabricant  SILABS [Silicon Laboratories]
Site Internet  http://www.silabs.com
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TS3005ITD1033T Fiches technique(HTML) 9 Page - Silicon Laboratories

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TS3005
TS3005 Rev. 1.0
Page 9
in Figure 1 can be used. In this circuit, the principle of
series-connected capacitors can be used to reduce
the effective capacitive load at the TS3005’s FOUT
and PWMOUT terminals.
To determine the optimal value for CEXT once the
probe capacitance is known by simply solving for
CEXT
using
the
following
expression:
For
example,
if
the
instrument’s
input
probe
capacitance is 15pF and the desired effective load
capacitance at either or both FOUT and PWMOUT
terminals is to be
≤5pF, then the value of CEXT should
be
≤7.5pF.
TS3005 Start-up Time
As the TS3005 is powered up, its FOUT terminal
(and PWMOUT terminal, if enabled) is active once
the applied VDD is higher than 1.55V. Once the
applied VDD is higher than 1.55V, the master
oscillator achieves steady-state operation within
18ms.
5 Weeks and 5 Days Counter Circuit with TS3005
The TS3005 can be configured into a 5 Weeks and 5
Days counter as shown in Figure 2. The circuit is
composed of a TS3005 timer and a dual 74VHC393
4-bit counter. The TS3005 divider inputs are set to
FDIV2:0 = 111. With an RSET of 11M
Ω, the FOUT
period is approximately 30 hours. The complete
circuit
consumes
approximately
4.5µA
and
is
powered with a single 3V CR2032 lithium button cell
battery. If a shorter period is desired, a 10 day period
is available via output 1QD.
Divide the PWMOUT Output Frequency by Two
with the TS3005
Using a single resistor and capacitor, the TS3005 can
be configured to a divide by two circuit as shown in
Figure 3. To achieve a divide by two function with the
TS3005, the pulse width of the PWMOUT output
must be at least a factor of 2 greater than the period
set at FOUT by resistor RSET. The CPWM capacitor
selected must meet this pulse width requirement and
Figure 3: Configuring the TS3005 into a Divide by
Two Frequency Divider
Figure 2: 5 Weeks and 5 Days Counter Circuit


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