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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: 48/167頁
文件大小: 2566K
代理商: TPS65950ZXNR
OR
32kHz
32KXIN
32KXOUT
32-kHz
OSC
IO_1P8
(1.8V)
32KCLKOUT
RTC
032-072
TPS65950
Integrated Power Management/Audio Codec
www.ti.com
SWCS032 – OCTOBER 2008
Figure 12-11. 32.768-kHz Clock Output Block Diagram
The TPS65950 has an internal 32.768-kHz oscillator connected to an external 32.768-kHz crystal through
the 32KXIN/32KXOUT balls or an external digital 32.768-kHz clock through the 32KXIN input (see
Figure 12-11). The TPS65950 also generates a 32.768-kHz digital clock through the 32KCLKOUT pin and
can broadcast it externally to the application processor or any other devices. The 32KCLKOUT clock is
broadcast by default in the TPS65950 active mode, but can be disabled if it is not used.
The 32.768-kHz clock (or signal) also clocks the RTC embedded in the TPS65950. The RTC is not
enabled by default. The host processor must set the correct date and time and enable the RTC.
The 32KCLKOUT output buffer can drive several devices (up to a 40-pF load). At startup, the 32.768-kHz
output clock (32KCLKOUT) must be stabilized (frequency/duty cycle) before the signal output. Depending
on the startup condition, this can delay the startup sequence.
Table 12-9 lists the electrical characteristics of the 32KCLKOUT output clock.
Table 12-9. 32KCLKOUT Output Clock Electrical Characteristics
Name
Parameter Description
Min(1)
Typ(2) Max(3)
Unit
f
Frequency
32.768
kHz
CL
Load capacitance
40
pF
VOUT
Output clock voltage, depending on output reference level IO_1P8 (see Section 2)
1.8(4)
V
VOH
Voltage output high
VOUT – 0.45
VOUT
V
VOL
Voltage output low
0
0.45
V
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
(4)
The output voltage depends on output reference level, which is IO_1P8 (see Section 2, Terminal Description).
Table 12-10 lists the timing characteristics of the 32KCLKOUT output clock. Figure 12-12 shows the
waveform of the 32KCLKOUT output clock.
Clock Specifications
141
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