MSP430FR573x
MSP430FR572x
SLAS639D –JULY 2011–REVISED AUGUST 2012
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(1)
Crystal Oscillator, XT1, High-Frequency (HF) Mode
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX UNIT
fOSC = 4 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVE = {0},
TA = 25°C, CL,eff = 16 pF
175
fOSC = 8 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVE = {1},
TA = 25°C, CL,eff = 16 pF
300
350
550
XT1 oscillator crystal current HF
mode
IVCC,HF
3 V
µA
fOSC = 16 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVE = {2},
TA = 25°C, CL,eff = 16 pF
fOSC = 24 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVE = {3},
TA = 25°C, CL,eff = 16 pF
XT1 oscillator crystal frequency,
HF mode 0
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {0}
fXT1,HF0
fXT1,HF1
fXT1,HF2
fXT1,HF3
fXT1,HF,SW
4
6
6
MHz
(2)
(3)
(3)
(3)
XT1 oscillator crystal frequency,
HF mode 1
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {1}
10 MHz
16 MHz
24 MHz
24 MHz
XT1 oscillator crystal frequency,
HF mode 2
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {2}
10
16
1
XT1 oscillator crystal frequency,
HF mode 3
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {3}
XT1 oscillator logic-level square-
wave input frequency, HF mode
XTS = 1,
XT1BYPASS = 1
(4) (3)
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {0},
fXT1,HF = 4 MHz, CL,eff = 16 pF
450
320
200
200
8
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {1},
fXT1,HF = 8 MHz, CL,eff = 16 pF
Oscillation allowance for
HF crystals
OAHF
Ω
(5)
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {2},
fXT1,HF = 16 MHz, CL,eff = 16 pF
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {3},
fXT1,HF = 24 MHz, CL,eff = 16 pF
fOSC = 4 MHz, XTS = 1,
XT2BYPASS = 0, XT2DRIVE = {0},
TA = 25°C, CL,eff = 16 pF
(6)
tSTART,HF
Startup time, HF mode
3 V
ms
fOSC = 24 MHz, XTS = 1,
XT2BYPASS = 0, XT2DRIVE = {3},
TA = 25°C, CL,eff = 16 pF
2
(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.
54
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