CS35L32 Datasheet, PDF (7/51 Pages) Cirrus Logic – Boosted Class D Amplifier with Speaker-Protection Monitoring and Flash LED Drivers

CS35L32
2 Typical Connection Diagram
2 Typical Connection Diagram
PMU
Battery 3.0–5.25 V
10 F _* 0.1 F
1 H
LBST
VP
SW
CS35L32
VA
1.71–1.89 V
Note 2
RP RP RP_I
Applications
Processor
0.1 F * 4.7 F *
*
Line Input 1
Note 3
*
VA
FILT+
GNDA
IN+
IN–
SDA
SCL
INT
RESET
FLEN
FLINH
SPKRSUPPLY
VBST
GNDP
0.1 F
*
Note 1 ^*
C_BST
10 F 10 F
FLOUT1
FLOUT2 / AD0
GNDPLED
IREF+
ISENSE–/
VSENSE+
RBST_SNS
44.2 k
Note 4
See Note 7 for LED
and I²C addressing
options.
MCLK
ISENSE+
Note 5
SCLK
LRCK
SDOUT
SPKOUT+
0.1 
SPKOUT–/
VSENSE–
Note 6
** ^COUT
** ^COUT
8
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 I²C addressing options:
a) AD0 = 1
b) AD0 = 1
c) AD0 = 1
d) AD0 = 0
VBST
VBST
VBST
VBST
DS963F5
NC
FLOUT1 FLOUT2
FLOUT1 FLOUT2
FLOUT1 FLOUT2
Figure 2-1. Typical Connection Diagram
FLOUT1 FLOUT2
7