4 functional description, 1 power supplies, 2 interrupts – Cirrus Logic CS35L32 User Manual

Page 15: Section 4.1, Cs35l32

DS963F4

CS35L32

4 Functional Description

Figure 4-1. CS35L32 Block Diagram

4.1 Power Supplies

The VA and VP supplies are required for proper operation of the CS35L32. Before either supply is powered down, RESET
must be asserted. RESET must be held in the asserted state until all supplies are up and within the recommended range.
Timing requirement for RESET during supply power up and power down is described in

Table 3-11

. The VBST supply is

generated internally (as described in

Section 7.12

) and connected to the high-power output stage of the Class D amplifier

through two balls: VBST and SPKRSUPPLY. By so doing, the speaker amplifier benefits from the proximity of the external
decoupling capacitor that is connected to the boosted supply.

4.2 Interrupts

Events that require special attention, such as when a threshold is exceeded or an error occurs, are reported through the
assertion of the interrupt output pin, INT. These events are captured within the interrupt status registers. Events can be
individually masked by setting corresponding bits in the interrupt mask registers.

Table 4-1

lists interrupt status and mask

registers. The configuration of mask bits determines which events cause the immediate assertion of INT:

• When an unmasked interrupt status event is detected, the status bit is set and INT is asserted.
• When a masked interrupt status event is detected, the interrupt status bit is set, but INT is not affected.

Once INT is asserted, it remains asserted until all unmasked status bits that are set have been read. Interrupt status bits
are sticky and read-to-clear: Once set, they remain set until the register is read and the associated interrupt condition is
not present. If a condition is still present and the status bit is read, although INT is deasserted, the status bit remains set.

Class D Power Stage

SPKR SUPPLY

GNDPLED

Current Mode Synchronous

Boost Controller

VCOM

Range

Scaling

Class D Front End

Short Circuit Protection

∆Σ Class D Modulator

REF