CS43L36 datasheet(43/89 Pages) CIRRUS

43 / 89 page

DS1081F3

CS43L36

4.9 Power-Supply Considerations

Table 4-11 describes the plug/unplug status.

4.9 Power-Supply Considerations

Because some power supply combinations can produce unwanted system behavior, note the following:

• Control-port transactions can occur 1 ms after VP, VD_FILT, VCP, and VL exceed the minimum operating voltage.

• If VP supply is off, it is recommended that all other supplies are also off. VP must be the first supply turned on.

• RESET must be asserted until VP is valid.

• If VD_FILT is supplied externally (DIGLDO_PDN = GND), VL must be supplied before VD_FILT, VA, VL, and VCP

can come up in any order. Due to the VD_FILT POR, VD_FILT must be turned off before VA, VL, or VCP are turned

off; otherwise, current could be drawn from supplies that remain on.

Table 4-12 shows the maximum current for each supply when VP is on, but other supplies are on or off (all clocks are off

and all registers are set to default values, i.e., reset).

Table 4-13 shows requirements and available features for valid power-supply configurations.

4.9.1

VP Monitor

The CS43L36 voltage comparator monitors the VP power supply for potential brown-out conditions due to power-supply

overload or other fault conditions. To perform according to specifications, VP is expected to remain above 3.0 V at all

times. The VP monitor is enabled by setting VPMON_PDNB (see p. 63). Fig. 4-25 shows the behavior of the VP monitor.

Figure 4-25. VP Monitor

Table 4-11. Tip Plug/Unplug Status

Plug Status

Unplug Status

Interpretation

Tip is fully unplugged/not present

Reserved

Tip connection is in a transitional state

Tip is fully plugged/present

Table 4-12. Typical Leakage Current during Nonoperational Supply States (with VP Powered On)

Supply

Current (µA)

Notes

VCP

IVp

IVCP

IVA

IVL

Off

VA may source or sink current

Off

328

VA may source or sink current

Off

—

Off

328

—

Off

VA may source or sink current

328

—

Notes:

• Values shown reflect typical voltage and temperature. Leakage current may vary by orders of magnitude across the maximum

and minimum recommended operating supply voltages and temperatures listed in Table 3-2.

• Test conditions: Clock/data lines are held low, RESET is held high, and all registers are set to their default values.

Table 4-13. Valid Power-Supply Configurations

Configuration

Notes

On: VP

Off: VD_FILT = VCP = VL = VA

Limited set of headset plug-detect and WAKE output features, see Section 4.7 and Section 4.8.

On: VP = VL

Off: VD_FILT = VCP = VA = OFF

Limited set of headset plug-detect and WAKE output features, see Section 4.7 and Section 4.8.

Digital I/O ESD diodes are powered to prevent conduction in pin-sharing applications.

On: VP = VD_FILT = VCP = VL = VA

Full chip functionality

VPMON_TRIP

2.6 V

3.0 V

3.6 V

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