Cirrus Logic CS35L32 - Manual (Page 7)

DS963F4 7
CS35L32
2 Typical Connection Diagram
2 Typical Connection Diagram
Figure 2-1. Typical Connection Diagram
Battery
1 H
C
OUT
0.1 
0.1 F
**
L
BST
44.2 k 
R
BST_SNS
8 
C
OUT **
Applications
Processor
0.1 F
10 F
C
BST
*
*
R
P
R
P
R
P
_
I
PMU 10 F
*
0.1 F
VA
* 4.7 F *
Line Input 1
CS35L32
ISENSE–/
VSENSE+
SPKOUT+
ISENSE+
IREF+
SPKOUT–/
VSENSE–
VBST
GNDP
FLOUT1
FLOUT2 / AD0
GNDPLED
SPKRSUPPLY
SDOUT
LRCK
SCLK
MCLK
FLEN
FLINH
SCL
SDA
INT
RESET
VA
FILT+
GNDA
IN+
IN–
VP SW
*
*
3.0–5.25 V
1.71–1.89 V
10 F
Notes:
• All external passive component values are nominal values.
Key for capacitor types required:
* Use low ESR, X7R/X5R capacitors.
** Use low ESR, X7R capacitors.
If no type symbol is shown next to a capacitor, any type may be used.
• As required, add protection circuitry to ensure compliance with the absolute maximum ratings in Table 3-2 .
1. C
BST
is a ceramic capacitor and derates at DC voltages higher than 0 V. In this application, the capacitor should not derate to a value lower
than 4 F across the specified boost output voltage in Table 3-4 . Capacitor tolerance and the temperature coefficient should also be taken
into account to guarantee the 4- F value.
2. Minimum pull-up resistor values are selected in accordance with the Table 3-8 V
OL
specification . Maximum pull-up resistances are selected
based on load capacitance and relevant switching specs ( Table 3-13 ).
3. Select each capacitor to be 0.22 F for an 18-Hz passband @ 12-dB amplifier gain, for a 3-dB roll-off. The equation for calculating the
capacitance for a given passband is C = 1/(  * f * R
INDIF
), where C is in F, R
INDIF
is the differential input resistance in and f is in Hz (see
the differential input resistance specification in Table 3-3 ). Signals IN+ and IN– are subject to the recommended ranges in Table 3-1 .
4. R
BST_SNS
is inherently tied to the accuracy of the BST_IPK current limit. A resistor with a 0.1% tolerance is required for this component to
meet the specified IMAX(B) max and min values in Table 3-4 .
5. The required tolerance on the 0.1-  ISENSE resistor is 1%. The required temperature coefficient is ±200 ppm/°C.
6. C
OUT
capacitors are optional EMI suppressors used with CS35L32 edge-rate control, depending on application requirements. Because
switching losses increase linearly with increases to these capacitances, it is recommended that C
OUT
values not exceed 2 nF. The
recommended value is 470 pF.
7. LED and I 2 C addressing options:
VBST VBST
c) AD0 = 1 d) AD0 = 0 b) AD0 = 1 a) AD0 = 1
VBST VBST
FLOUT1 FLOUT2 FLOUT1 FLOUT2 FLOUT1 FLOUT2 FLOUT1 FLOUT2
NC
See Note 7 for LED
and I 2 C addressing
options.
Note 1
Note 3
Note 2
Note 5
Note 4
Note 6