MSP430FR5729 Datasheet, PDF (22/115 Pages) Texas Instruments – MSP430FR572x Mixed-Signal Microcontrollers

MSP430FR5729, MSP430FR5728, MSP430FR5727, MSP430FR5726, MSP430FR5725
MSP430FR5724, MSP430FR5723, MSP430FR5722, MSP430FR5721, MSP430FR5720
SLASE35A – MAY 2014 – REVISED JUNE 2014
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5.13 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
f_OSC = 4 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVE = {0},
T_A = 25°C, C_L,eff = 16 pF
f_OSC = 8 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVE = {1},
I_VCC,HF
XT1 oscillator crystal current HF
mode
T_A = 25°C, C_L,eff = 16 pF
f_OSC = 16 MHz,
3V
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVE = {2},
T_A = 25°C, C_L,eff = 16 pF
f_OSC = 24 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVE = {3},
T_A = 25°C, C_L,eff = 16 pF
f_XT1,HF0
XT1 oscillator crystal frequency,
HF mode 0
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {0} ⁽²⁾
MIN TYP
175
300
350
550
4
f_XT1,HF1
XT1 oscillator crystal frequency,
HF mode 1
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {1} ⁽³⁾
6
f_XT1,HF2
XT1 oscillator crystal frequency,
HF mode 2
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {2} ⁽³⁾
10
f_XT1,HF3
XT1 oscillator crystal frequency,
HF mode 3
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {3} ⁽³⁾
16
f_XT1,HF,SW
XT1 oscillator logic-level square-
wave input frequency, HF mode
XTS = 1,
XT1BYPASS = 1 ^{(4) (3)}
1
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {0},
450
f_XT1,HF = 4 MHz, C_L,eff = 16 pF
XTS = 1,
XT1BYPASS = 0, XT1DRIVE = {1},
320
OA_HF
Oscillation allowance for
HF crystals ⁽⁵⁾
f_XT1,HF = 8 MHz, C_L,eff = 16 pF
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_START,HF
Startup time, HF mode ⁽⁶⁾
T_A = 25°C, C_L,eff = 16 pF
f_OSC = 24 MHz, XTS = 1,
3V
XT1BYPASS = 0, XT1DRIVE = {3},
2
T_A = 25°C, C_L,eff = 16 pF
MAX UNIT
µA
6 MHz
10 MHz
16 MHz
24 MHz
24 MHz
Ω
ms
(1) To improve EMI on the XT1 oscillator the following guidelines should be observed.
• Keep the traces between the device and the crystal as short as possible.
• Design a good ground plane around the oscillator pins.
• Prevent crosstalk from other clock or data lines into oscillator pins XIN and XOUT.
• Avoid running PCB traces underneath or adjacent to the XIN and XOUT pins.
• Use assembly materials and processes that avoid any parasitic load on the oscillator XIN and XOUT pins.
• If conformal coating is used, ensure that it does not induce capacitive or 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.
22
Specifications
Copyright © 2014, Texas Instruments Incorporated
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