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參數資料
型號: TPS65920A2ZCHR
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PBGA139
封裝: 10 X 10 MM, 0.65 MM PITCH, GREEN, PLASTIC, NFBGA-139
文件頁數: 102/115頁
文件大小: 1232K
代理商: TPS65920A2ZCHR
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)
037-042
SWCS037G
– MAY 2008 – REVISED APRIL 2011
11.2.3.1 External Crystal Description
Figure 11-5 shows the 32-kHz oscillator block diagram 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 11-5. 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 14-1.
Table 11-4 lists the required electrical constraints.
Table 11-4. Crystal Electrical Characteristics
Parameter
Min
Typ
Max
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
Nominal load cap on each oscillator input CXIN and CXOUT(1)
CXIN = CXOUT = Cosc*2
– (Cint +
pF
Cpin)
Pin-to-pin capacitance
1.6
1.8
pF
(1)
Nominal load capacitor on each oscillator input defined as CXIN = CXOUT = Cosc*2
– (Cint + Cpin). Cosc is the load capacitor defined
in the crystal oscillator specification, Cint is the internal capacitor, and Cpin is the parallel input capacitor.
Copyright
2008–2011, Texas Instruments Incorporated
Clock Specifications
87
focus.ti.com: TPS65930/TPS65920
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