AMIC110 Datasheet, PDF (101/214 Pages) Texas Instruments – Sitara Processors

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AMIC110
SPRS971A – AUGUST 2016 – REVISED SEPTEMBER 2016
Table 6-5. OSC1 Crystal Circuit Requirements
NAME
ƒ_xtal
C_C1
C_C2
C_shunt
ESR
DESCRIPTION
Crystal parallel resonance
frequency
Crystal frequency stability
and tolerance⁽¹⁾
C₁ capacitance
C₂ capacitance
Shunt capacitance
Crystal effective series
resistance
Fundamental mode oscillation only
Maximum RTC error = 10.512 minutes
per year
Maximum RTC error = 26.28 minutes per
year
ƒ_xtal = 32.768 kHz, oscillator has nominal
negative resistance of 725 kΩ and worst-
case negative resistance of 250 kΩ
MIN
–20.0
–50.0
12.0
12.0
TYP
32.768
MAX
UNIT
kHz
20.0 ppm
50.0 ppm
24.0 pF
24.0 pF
1.5 pF
80 kΩ
(1) Initial accuracy, temperature drift, and aging effects should be combined when evaluating a reference clock for this requirement.
NAME
C_pkg
P_xtal
t_sX
Table 6-6. OSC1 Crystal Circuit Characteristics
DESCRIPTION
Shunt capacitance of
package
ZCE package
ZCZ package
The actual values of the ESR, ƒ_xtal, and C_L should be used to yield a
typical crystal power dissipation value. Using the maximum values
specified for ESR, ƒ_xtal, and C_L parameters yields a maximum power
dissipation value.
Start-up time
MIN
TYP
MAX
0.17
0.01
P_xtal = 0.5 ESR (2 π ƒ_xtal C_L
VDDS_RTC)²
2
UNIT
pF
pF
s
CAP_VDD_RTC (min.)
VSS_RTC
VDDS_RTC (min.)
CAP_VDD_RTC
VDDS_RTC
VSS_RTC
RTC_XTALOUT
t_sX
Time
Figure 6-14. OSC1 Start-up Time
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