MSP430FR5969_14 Datasheet, PDF (28/132 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FR5969, MSP430FR59691, MSP430FR5968, MSP430FR5967
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SLAS704B – OCTOBER 2012 – REVISED MAY 2014
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Table 5-5. High-Frequency Crystal Oscillator, HFXT⁽¹⁾
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
I_DVCC.HFXT
f_HFXT
PARAMETER
TEST CONDITIONS
f_OSC = 4 MHz,
HFXTBYPASS = 0, HFXTDRIVE = 0,
HFFREQ = 1⁽²⁾
T_A = 25°C
C_L,eff = 18 pF, typical ESR, C_shunt
HFXT oscillator crystal current HF
mode at typical ESR
f_OSC = 8 MHz,
HFXTBYPASS = 0, HFXTDRIVE = 1,
HFFREQ = 1
T_A = 25°C
C_L,eff = 18 pF, typical ESR, C_shunt
f_OSC = 16 MHz,
HFXTBYPASS = 0, HFXTDRIVE = 2,
HFFREQ = 2
T_A = 25°C
C_L,eff = 18 pF, typical ESR, C_shunt
HFXT oscillator crystal frequency,
crystal mode
f_OSC = 24 MHz
HFXTBYPASS = 0, HFXTDRIVE = 3,
HFFREQ = 3
T_A = 25°C
C_L,eff = 18 pF, typical ESR, C_shunt
HFXTBYPASS = 0, HFFREQ = 1 ⁽²⁾
(3)
HFXTBYPASS = 0, HFFREQ = 2 ⁽³⁾
HFXTBYPASS = 0, HFFREQ = 3 ⁽³⁾
V_CC
3.0 V
MIN TYP
75
120
190
250
4
8.01
16.01
DC_HFXT HFXT oscillator duty cycle.
Measured at SMCLK,
f_HFXT = 16 MHz
HFXTBYPASS = 1, HFFREQ = 0⁽⁴⁾
(3)
40
50
0.9
f_HFXT,SW
HFXT oscillator logic-level
square-wave input frequency,
bypass mode
HFXTBYPASS = 1, HFFREQ = 1⁽⁴⁾
(3)
HFXTBYPASS = 1, HFFREQ = 2⁽⁴⁾
(3)
4.01
8.01
HFXTBYPASS = 1, HFFREQ = 3⁽⁴⁾
(3)
16.01
DC_HFXT,
SW
HFXT oscillator logic-level
square-wave input duty cycle
t_START,HFXT Startup time⁽⁵⁾
HFXTBYPASS = 1
f_OSC = 4 MHz
HFXTBYPASS = 0, HFXTDRIVE = 0,
HFFREQ = 1
T_A = 25°C,
C_L,eff = 16 pF
f_OSC = 24 MHz
HFXTBYPASS = 0, HFXTDRIVE = 3,
HFFREQ = 3
T_A = 25°C,
C_L,eff = 16 pF
3.0 V
3.0 V
40
1.6
0.6
MAX UNIT
μA
8
16 ^MHz
24
60 %
4
8
MHz
16
24
60 %
ms
(1) To improve EMI on the HFXT 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 HFXIN and HFXOUT.
• Avoid running PCB traces underneath or adjacent to the HFXIN and HFXOUT pins.
• Use assembly materials and praxis to avoid any parasitic load on the oscillator HFXIN and HFXOUT pins.
• If conformal coating is used, ensure that it does not induce capacitive/resistive leakage between the oscillator pins.
(2) HFFREQ = {0} is not supported for HFXT crystal mode of operation.
(3) Maximum frequency of operation of the entire device cannot be exceeded.
(4) When HFXTBYPASS is set, HFXT circuits are automatically powered down. Input signal is a digital square wave with parametrics
defined in the Schmitt-trigger Inputs section of this datasheet. Duty cycle requirements are defined by DC_{HFXT, SW}.
(5) Includes startup counter of 1024 clock cycles.
28
Specifications
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