TPS65930 Datasheet, PDF (90/114 Pages) Texas Instruments – Integrated Power Management Audio Codec (TPS65930 Only)

TPS65930/TPS65920
Integrated Power Management
\Audio Codec (TPS65930 Only)
SWCS037D – MAY 2008 – REVISED JUNE 2009
Current control
circuit and mode
selection
Bias generator
and startup
circuit
Signal swing
limiting circuit
Signal
shaping
www.ti.com
Y
(1)
VBATOK
Internal
GND
XI
XO
Floating
Square wave:
Vpp = VIO_1P8V
(1)
VBATOK
Internal
GND
037-040
(1) Switches close by default and open only if register access enables very-low-power mode when VBAT < 2.7 V.
Figure 11-9. 32-kHz Oscillator in Bypass Mode Block Diagram Without Crystal Option 3
Table 11-7 lists the electrical constraints required by the 32-kHz input square- or sine-wave clock.
Table 11-7. 32-kHz Input Square- or Sine-Wave Clock Source Electrical Characteristics
Name
Parameter Description
Min
f
Frequency
C_I
Input capacitance
C_FI
On-chip foot capacitance to GND on each input (see Figure 11-7, Figure 11-8, and
Figure 11-9)
V_PP
Square-/sine-wave amplitude in bypass mode or not
V_IH
Voltage input high, square wave in bypass mode
0.8
V_IL
Voltage input low, square wave in bypass mode
(1) Bypass input maximum voltage is the same as the maximum voltage provided for the I/O interface.
Typ
32.768
35
10
1.8 ⁽¹⁾
Max Unit
kHz
pF
pF
V
V
0.6 V
Table 11-8 lists the timing requirements of the 32-kHz square-wave input clock.
Table 11-8. 32-kHz Square-Wave Input Clock Source Timing Requirements
Name
Parameter
Description
CK0
CK1
CK3
CK4
1/t_C(32KHZ)
t_W(32KHZ)
t_R(32KHZ)
t_F(32KHZ)
Frequency, 32 kHz
Pulse duration, 32 kHz low or high
Rise time, 32 kHz⁽¹⁾
Fall time, 32 kHz⁽¹⁾
(1) The capacitive load is 30 pF.
Min
0.45*t_C(32KHZ)
Typ
32.768
Max
0.55*t_C(32KHZ)
0.1*t_C(32KHZ)
0.1*t_C(32KHZ)
Unit
MHz
µs
µs
µs
90
Clock Specifications
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