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參數資料
型號: TPS65950ZXNR
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PBGA209
封裝: 7 X 7 MM, 0.40 MM PITCH, PLASTIC, BGA-209
文件頁數: 42/167頁
文件大小: 2566K
代理商: TPS65950ZXNR
12.2.3.1 External Crystal Description
Signalswing
limitingcircuit
Biasgenerator
andstartup
circuit
XI
XO
Signal
shaping
C1
C2
Y
Currentcontrol
circuitand
modeselection
XTAL
Externaltodevice
VBATOK
(1)
Internal
GND
Internal
GND
VBATOK
(1)
032-066
TPS65950
Integrated Power Management/Audio Codec
SWCS032 – OCTOBER 2008
www.ti.com
An external square or sine wave of 32.768 kHz through 32KXIN with amplitude of 1.8 or 1.85 V (see
Figure 12-7, Figure 12-8, and Figure 12-9). This configuration is available for master and slave modes
(for more information, see Section 13, Timing Requirements and Switching Characteristics).
Figure 12-5 is a block diagram of the 32-kHz oscillator with crystal in master mode.
NOTE: Switches close by default and open only if register access enables very-low-power mode when VBAT < 2.7 V.
Figure 12-5. 32-kHz Oscillator Block Diagram In Master Mode With Crystal
CXIN and CXOUT represent the total capacitance of the printed circuit board (PCB) and components,
excluding the crystal. Their values depend on the datasheet of the crystal, the internal capacitors, and the
parallel capacitor. The frequency of the oscillations depends on the value of the capacitors. The crystal
must be in the fundamental mode of operation and parallel resonant.
NOTE
For the values of CXIN and CXOUT, see Table 15-1.
Table 12-4 lists the required electrical constraints.
Table 12-4. Crystal Electrical Characteristics
Parameter
Min(1)
Typ(2)
Max(3)
Unit
Parallel resonance crystal frequency
32.768
kHz
Input voltage, Vin (normal mode)
1.0
1.3
1.55
V
Internal capacitor on each input (Cint)
10
pF
Parallel input capacitance (Cpin)
1
pF
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
Clock Specifications
136
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