CS43L36 datasheet(41/89 Pages) CIRRUS

41 / 89 page

DS1081F3

CS43L36

4.7 Headset Interface

Minimize the SRCs’ lock time by programming the serial-port interface sample rates into the x_FS registers (see

Section 7.13.1). If the rates are unknown, programming these registers to “don’t know” would likely increase lock times.

Proper operation is not assured if sample rates are misprogrammed.

4.7 Headset Interface

Split digital-power domains (VD_FILT and VP) within the headset interface support an ultralow-power standby mode

where only the VP supply is used. An output signal may be used to tell the system to wake from its low-power state when

a headset plug is inserted or removed. The interface may be reset by three types of resets with progressively less effect.

Figure 4-23. Headset Interface Block Diagram

The control port includes registers that source individually maskable interrupts. Event-change debouncing is used to filter

applicable status registers. Latchable duplicate registers are used to pass information to the Standby Mode supply domain.

4.8 Plug Presence Detect

The CS43L36 uses TIP_SENSE to detect plug presence. The sense pin is debounced to filter out brief events before being

reported to the corresponding presence-detect bit and generating an interrupt if appropriate.

4.8.1

Plug Types

The CS43L36 supports the following industry-standard plug types:

• Tip–Ring–Sleeve (TRS)—Consists of a segmented metal barrel with the tip connector used for HPOUTA, a ring

connector used for HPOUTB, and a sleeve connector used for HSGND.

• Tip–Ring–Ring–Sleeve (TRRS)—Like TRS, with an additional ring connector for the mic connection. There are two

common pinouts for TRRS plugs:

— One uses the tip for HPOUTA, the first ring for HPOUTB, the second ring for HSGND, and the sleeve for mic.

— The CS43L36 does not support OMTP, or China, headset, which swaps the third and fourth connections, so that

the second ring carries mic and the sleeve carries HSGND.

4.8.2

Tip-Sense Methods

The following methods are used to detect the presence or absence of a plug:

• Tip sense (TS)—A sense pin is connected to a terminal on the receptacle such that, if no plug is inserted, the pin is floating.

If a plug is inserted, the pin is shorted to the tip (T) terminal. The tip is sensed by having a small current source in the

device pull up the pin if it is left floating (no plug). If a plug is inserted and the sense pin is shorted to HPOUTA, the sense

TIP_SENSE

–VCP_FILT

GND

Plug Detect

Headset Interface

Step-Down,

Inverting Charge

Pump

Control Port

INT

WAKE

RESET

–VCP_FILT

GND

RESET

LDO Regulator

and POR

Generator

Power On Reset

Control

Port

Logic

RESET

Level

Shifters

VD_FILT

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