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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: 39/167頁
文件大小: 2566K
代理商: TPS65950ZXNR
12.2 Input Clock Specifications
12.2.1 Clock Source Requirements
12.2.2 High-Frequency Input Clock
HFCLKIN
SLEEP1
SLEEP2
CLKEN
Clock
generator
CLKREQ
Mainstate-machine
Optionalrequest
configurablebysoftware
onlyforlegacysupport
HFCLKOUT
Slicer
Timer
CLKEN2
SLICER_OK
Slicerbypass
032-063
TPS65950
Integrated Power Management/Audio Codec
www.ti.com
SWCS032 – OCTOBER 2008
The clock system accepts two input clock sources:
32-kHz crystal oscillator clock or sinusoidal/squared clock
HFCLKIN high-frequency input clock
Table 12-1 lists the input clock requirements.
Table 12-1. TPS65950 Input Clock Source Requirements
Pad
Clock Frequency
Stability
Duty Cycle
Crystal
±30 ppm
40%/60%
32KXIN
32.768 kHz
Square wave
45%/55%
32KXOUT
Sine wave
Square wave
±150 ppm
45%/55%
HFCLKIN
19.2, 26, 38.4 MHz
Sine wave
HFCLKIN is the high-frequency input clock. It can be a square- or sine-wave input clock. If a square-wave
input clock is provided, it is recommended to switch the block to bypass mode when possible to avoid
loading the clock.
Figure 12-2 shows the HFCLKIN clock distribution.
Figure 12-2. HFCLKIN Clock Distribution
When a device needs a clock signal other than 32.768 kHz, it makes a clock request and activates the
CLKREQ pin. As a result, the TPS65950 immediately sets CLKEN to 1 to warn the clock provider in the
Clock Specifications
133
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