Datasheet

MSP430FR573x
MSP430FR572x
www.ti.com SLAS639H –JULY 2011–REVISED SEPTEMBER 2013
Crystal Oscillator, XT1, High-Frequency (HF) Mode
(1)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
f
OSC
= 4 MHz,
XTS = 1, XOSCOFF = 0,
175
XT1BYPASS = 0, XT1DRIVE = {0},
T
A
= 25°C, C
L,eff
= 16 pF
f
OSC
= 8 MHz,
XTS = 1, XOSCOFF = 0,
300
XT1BYPASS = 0, XT1DRIVE = {1},
T
A
= 25°C, C
L,eff
= 16 pF
XT1 oscillator crystal current HF
I
VCC,HF
3 V µA
mode
f
OSC
= 16 MHz,
XTS = 1, XOSCOFF = 0,
350
XT1BYPASS = 0, XT1DRIVE = {2},
T
A
= 25°C, C
L,eff
= 16 pF
f
OSC
= 24 MHz,
XTS = 1, XOSCOFF = 0,
550
XT1BYPASS = 0, XT1DRIVE = {3},
T
A
= 25°C, C
L,eff
= 16 pF
XT1 oscillator crystal frequency, XTS = 1,
f
XT1,HF0
4 6 MHz
HF mode 0 XT1BYPASS = 0, XT1DRIVE = {0}
(2)
XT1 oscillator crystal frequency, XTS = 1,
f
XT1,HF1
6 10 MHz
HF mode 1 XT1BYPASS = 0, XT1DRIVE = {1}
(3)
XT1 oscillator crystal frequency, XTS = 1,
f
XT1,HF2
10 16 MHz
HF mode 2 XT1BYPASS = 0, XT1DRIVE = {2}
(3)
XT1 oscillator crystal frequency, XTS = 1,
f
XT1,HF3
16 24 MHz
HF mode 3 XT1BYPASS = 0, XT1DRIVE = {3}
(3)
XT1 oscillator logic-level square- XTS = 1,
f
XT1,HF,SW
1 24 MHz
wave input frequency, HF mode XT1BYPASS = 1
(4) (3)
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {0}, 450
f
XT1,HF
= 4 MHz, C
L,eff
= 16 pF
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {1}, 320
f
XT1,HF
= 8 MHz, C
L,eff
= 16 pF
Oscillation allowance for
OA
HF
Ω
HF crystals
(5)
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {2}, 200
f
XT1,HF
= 16 MHz, C
L,eff
= 16 pF
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {3}, 200
f
XT1,HF
= 24 MHz, C
L,eff
= 16 pF
f
OSC
= 4 MHz, XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {0}, 8
T
A
= 25°C, C
L,eff
= 16 pF
t
START,HF
Startup time, HF mode
(6)
3 V ms
f
OSC
= 24 MHz, XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {3}, 2
T
A
= 25°C, C
L,eff
= 16 pF
(1) To improve EMI on the XT1 oscillator the following guidelines should be observed.
(a) Keep the traces between the device and the crystal as short as possible.
(b) Design a good ground plane around the oscillator pins.
(c) Prevent crosstalk from other clock or data lines into oscillator pins XIN and XOUT.
(d) Avoid running PCB traces underneath or adjacent to the XIN and XOUT pins.
(e) Use assembly materials and praxis to avoid any parasitic load on the oscillator XIN and XOUT pins.
(f) If conformal coating is used, ensure that it does not induce capacitive/resistive leakage between the oscillator pins.
(2) Maximum frequency of operation of the entire device cannot be exceeded.
(3) Maximum frequency of operation of the entire device cannot be exceeded.
(4) When XT1BYPASS is set, XT1 circuits are automatically powered down. Input signal is a digital square wave with parametrics defined in
the Schmitt-trigger Inputs section of this data sheet.
(5) Oscillation allowance is based on a safety factor of 5 for recommended crystals.
(6) Includes startup counter of 4096 clock cycles.
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