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參數(shù)資料
型號: TPS65950ZXNT
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費(fèi)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(shù): 47/167頁
文件大小: 2566K
代理商: TPS65950ZXNT
32KX
CK0
CK1
032-071
12.3 Output Clock Specifications
12.3.1 32KCLKOUT Output Clock
TPS65950
Integrated Power Management/Audio Codec
SWCS032 – OCTOBER 2008
www.ti.com
Table 12-7. 32-kHz Input Square- or Sine-Wave Clock Source Electrical Characteristics
Name
Parameter Description
Min(1)
Typ(2)
Max(3)
Unit
f
Frequency
32.768
kHz
CI
Input capacitance
35
pF
CFI
On-chip foot capacitance to GND on each input (see Figure 12-7, Figure 12-8, and
10
pF
VPP
Square-/sine-wave amplitude in bypass mode or not
1.8(4)
V
VIH
Voltage input high, square wave in bypass mode
0.8
V
VIL
Voltage input low, square wave in bypass mode
0.6
V
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
(4)
Bypass input maximum voltage is the same as the maximum voltage provided for the I/O interface.
Table 12-8 lists the input requirements of the 32-kHz square-wave input clock.
Table 12-8. 32-kHz Square-Wave Input Clock Source Timing Requirements
Name
Parameter
Description
Min(1)
Typ(2)
Max(3)
Unit
CK0
1/tC(32KHZ)
Frequency, 32 kHz
32.768
MHz
CK1
tW(32KHZ)
Pulse duration, 32 kHz low or high
0.45*tC(32KHZ)
0.55*tC(32KHZ)
s
CK3
tR(32KHZ)
Rise time, 32 kHz(4)
0.1*tC(32KHZ)
s
CK4
tF(32KHZ)
Fall time, 32 kHz(4)
0.1*tC(32KHZ)
s
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
(4)
The capacitive load is 30 pF.
Figure 12-10 shows the timing of the 32-kHz square- or sine-wave input clock.
Figure 12-10. 32-kHz Square- or Sine-Wave Input Clock
The TPS65950 provides two output clocks:
32KCLKOUT
HFCLKOUT
Figure 12-11 is a block diagram of the 32.768-kHz clock output.
140
Clock Specifications
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