MSP430BT5190_15 Datasheet, PDF (21/105 Pages) Texas Instruments – Mixed-Signal Microcontroller

www.ti.com
MSP430BT5190
SLAS703B – APRIL 2010 – REVISED AUGUST 2015
5.16 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
f_OSC = 4 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVEx = 0,
T_A = 25°C
f_OSC = 12 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVEx = 1,
I_DVCC.HF
XT1 oscillator crystal current,
HF mode
T_A = 25°C
f_OSC = 20 MHz,
3V
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVEx = 2,
T_A = 25°C
f_OSC = 32 MHz,
XTS = 1, XOSCOFF = 0,
XT1BYPASS = 0, XT1DRIVEx = 3,
T_A = 25°C
f_XT1,HF0
XT1 oscillator crystal frequency, XTS = 1,
HF mode 0
XT1BYPASS = 0, XT1DRIVEx = 0⁽²⁾
MIN TYP
200
260
325
450
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)}
1.5
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,
0.5
t_START,HF Start-up time, HF mode
T_A = 25°C, C_L,eff = 15 pF
f_OSC = 20 MHz, XTS = 1,
3V
XT1BYPASS = 0, XT1DRIVEx = 2,
0.3
T_A = 25°C, C_L,eff = 15 pF
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.
• 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 techniques that avoid any parasitic load on the oscillator XIN and XOUT pins.
• If conformal coating is used, make sure that it does not induce capacitive or 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. The input signal must be a digital square wave with the
parametrics defined in the Schmitt-Trigger Inputs section.
(4) Oscillation allowance is based on a safety factor of 5 for recommended crystals.
Copyright © 2010–2015, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links: MSP430BT5190
Specifications
21