MSP430F2132-EP Datasheet, PDF (35/72 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F2132-EP
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Crystal Oscillator LFXT1, High-Frequency Mode⁽¹⁾⁽²⁾
PARAMETER
TEST CONDITIONS
f_LFXT1,HF0
LFXT1 oscillator crystal
frequency, HF mode 0
XTS = 1, XCAPx = 0, LFXT1Sx = 0
f_LFXT1,HF1
LFXT1 oscillator crystal
frequency, HF mode 1
XTS = 1, XCAPx = 0, LFXT1Sx = 1
f_LFXT1,HF2
LFXT1 oscillator crystal
frequency, HF mode 2
XTS = 1, XCAPx = 0, LFXT1Sx = 2
f_{LFXT1,HF,logic}
OA_HF
C_L,eff
f_Fault,HF
LFXT1 oscillator logic-level
square-wave input
frequency, HF mode
XTS = 1, XCAPx = 0, LFXT1Sx = 3
Oscillation allowance for HF
crystals (see Figure 19 and
Figure 20)
Integrated effective load
capacitance, HF mode⁽³⁾
Duty cycle, HF mode
Oscillator fault frequency ⁽⁵⁾
XTS = 1, XCAPx = 0, LFXT1Sx = 0,
f_LFXT1,HF = 1 MHz, C_L,eff = 15 pF
XTS = 1, XCAPx = 0, LFXT1Sx = 1,
f_LFXT1,HF = 4 MHz, C_L,eff = 15 pF
XTS = 1, XCAPx = 0, LFXT1Sx = 2,
f_LFXT1,HF = 16 MHz, C_L,eff = 15 pF
XTS = 1, XCAPx = 0⁽⁴⁾
XTS = 1, XCAPx = 0,
Measured at P2.0/ACLK,
f_LFXT1,HF = 10 MHz
XTS = 1, XCAPx = 0,
Measured at P2.0/ACLK,
f_LFXT1,HF = 16 MHz
XTS = 1, XCAPx = 0, LFXT1Sx = 3⁽⁶⁾
SLAS913A – JULY 2013 – REVISED AUGUST 2013
V_CC
1.8 V to 3.6 V
1.8 V to 3.6 V
1.8 V to 3.6 V
2.2 V to 3.6 V
3 V to 3.6 V
1.8 V to 3.6 V
2.2 V to 3.6 V
3 V to 3.6 V
MIN TYP MAX UNIT
0.4
1 MHz
1
2
2
2
0.4
0.4
0.4
2700
4 MHz
10
12 MHz
16
10
12 MHz
16
800
Ω
300
1
pF
2.2 V, 3 V
2.2 V, 3 V
40
50
60
%
40
50
60
30
300 kHz
(1) To improve EMI on the XT2 oscillator the following guidelines should be observed:
(a) Keep the trace 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 or resistive leakage between the oscillator pins.
(g) Do not route the XOUT line to the JTAG header to support the serial programming adapter as shown in other documentation. This
signal is no longer required for the serial programming adapter.
(2) Use of the LFXT1 Crystal Oscillator at T_A > 105°C is not ensured. It is recommended that an external digital clock source or the internal
DCO is used to provide clocking.
(3) Includes parasitic bond and package capacitance (approximately 2 pF per pin). Because the PCB adds additional capacitance, it is
recommended to verify the correct load by measuring the ACLK frequency. For a correct setup, the effective load capacitance should
always match the specification of the used crystal.
(4) Requires external capacitors at both terminals. Values are specified by crystal manufacturers.
(5) Frequencies below the MIN specification set the fault flag, frequencies above the MAX specification do not set the fault flag, and
frequencies in between might set the flag.
(6) Measured with logic-level input frequency, but also applies to operation with crystals.
Copyright © 2013, Texas Instruments Incorporated
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