MSP430F543XA_12 Datasheet, PDF (48/104 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F543xA, MSP430F541xA
SLAS655B – JANUARY 2010 – REVISED OCTOBER 2010
Crystal Oscillator, XT1, High-Frequency Mode⁽¹⁾
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V_CC
MIN TYP
f_OSC = 4 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVEx = 0,
200
T_A = 25°C
f_OSC = 12 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVEx = 1,
260
I_DVCC.HF
XT1 oscillator crystal current,
HF mode
T_A = 25°C
f_OSC = 20 MHz,
3.0 V
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVEx = 2,
325
T_A = 25°C
f_OSC = 32 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVEx = 3,
450
T_A = 25°C
f_XT1,HF0
XT1 oscillator crystal frequency, XTS = 1,
HF mode 0
XT1BYPASS = 0, XT1DRIVEx = 0⁽²⁾
4
f_XT1,HF1
XT1 oscillator crystal frequency, XTS = 1,
HF mode 1
XT1BYPASS = 0, XT1DRIVEx = 1⁽²⁾
8
f_XT1,HF2
XT1 oscillator crystal frequency, XTS = 1,
HF mode 2
XT1BYPASS = 0, XT1DRIVEx = 2⁽²⁾
16
f_XT1,HF3
XT1 oscillator crystal frequency, XTS = 1,
HF mode 3
XT1BYPASS = 0, XT1DRIVEx = 3⁽²⁾
24
f_XT1,HF,SW
XT1 oscillator logic-level
square-wave input frequency,
HF mode, bypass mode
XTS = 1,
XT1BYPASS = 1^{(3) (2)}
0.7
XTS = 1,
XT1BYPASS = 0, XT1DRIVEx = 0,
450
f_XT1,HF = 6 MHz, C_L,eff = 15 pF
XTS = 1,
XT1BYPASS = 0, XT1DRIVEx = 1,
320
OA_HF
Oscillation allowance for
HF crystals⁽⁴⁾
f_XT1,HF = 12 MHz, C_L,eff = 15 pF
XTS = 1,
XT1BYPASS = 0, XT1DRIVEx = 2,
200
f_XT1,HF = 20 MHz, C_L,eff = 15 pF
XTS = 1,
XT1BYPASS = 0, XT1DRIVEx = 3,
200
f_XT1,HF = 32 MHz, C_L,eff = 15 pF
f_OSC = 6 MHz, XTS = 1,
XT1BYPASS = 0, XT1DRIVEx = 0,
T_A = 25°C,
0.5
t_START,HF Startup time, HF mode
C_L,eff = 15 pF
f_OSC = 20 MHz, XTS = 1,
3.0 V
XT1BYPASS = 0, XT1DRIVEx = 2,
T_A = 25°C,
0.3
C_L,eff = 15 pF
www.ti.com
MAX UNIT
µA
8 MHz
16 MHz
24 MHz
32 MHz
32 MHz
Ω
ms
(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) This represents the maximum frequency that can be input to the device externally. Maximum frequency achievable on the device
operation is based on the frequencies present on ACLK, MCLK, and SMCLK cannot be exceed for a given range of operation.
(3) 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 datasheet.
(4) Oscillation allowance is based on a safety factor of 5 for recommended crystals.
48
Submit Documentation Feedback
Copyright © 2010, Texas Instruments Incorporated