CS35L32 datasheet(19/51 Pages) CIRRUS

19 / 51 page

DS963F5

CS35L32

4.8 Signal Monitoring

4.7.1

Error Conditions

Table 4-3 lists overtemperature error status and mask bits.

The overtemperature error and warning error conditions are described in detail in the following:

• Overtemperature warning (OTW). An OTW event occurs when the die temperature exceeds the overtemperature

threshold (listed in Table 3-3). When this occurs, an OTW (see p. 41) event is registered in the interrupt status

(Section 7.19); if M_OTW = 0, INT is asserted.

To exit the condition, the temperature must drop below the threshold and interrupt status 1 register must be read.

• Overtemperature error (OTE). An OTE event occurs when the die temperature exceeds the internally preset error

threshold (see Table 3-3). When this occurs, an OTE (see p. 41) event is registered in the interrupt status and, if

M_OTE =0, INT is asserted. The CS35L32 shuts down, the Class D amplifier enters Speaker Safe Mode, as

described in Section 4.3.4, and the LED drivers shut down.

To exit, the temperature must drop below the overtemperature shutdown threshold and OTE_RLS must be

sequenced as described in Section 7.15. After OTE release, the amplifier and LED drivers recover to preshutdown

settings. The LED drivers must be retriggered with FLEN and/or FLINH inputs for a lighting event to occur.

4.8 Signal Monitoring

Signal-monitoring ADCs, shown in Fig. 4-5, give upstream system processors access to important signals entering and

exiting the device. The three monitoring signals are as follows:

• VPMON: Monitors the voltage on the VP pin, which is most commonly the battery for the system.

• VMON: Monitors the output voltage of the Class D amplifier.

• IMON: Monitors the current that flows into the load being driven by the Class D amplifier.

An integrated ADC digitizes these analog signals, at which point, the audio/data serial port (ADSP) can send them to the

system processor.

Figure 4-5. Signal Monitoring Block Diagram (PDN_xMON = 0)

4.8.1

Power-Up and Power-Down Bits (PDN_xMON)

The three ADCs can be powered down independently via their respective PDN_xMON bit in the control port, see

Section 7.6. To power down an ADC and its associated support circuitry, its PDN_xMON bit must be set; clearing PDN_

xMON powers up the corresponding circuitry.

Note:

For proper operation, MCLK must be at the correct frequency (MCLK_ERR =0; see p. 41) and the device must

be powered (PDN_ALL = 0; see p. 36).

Table 4-3. Die Temperature Monitoring Configuration

Error

Cross-Reference to Register Field Description

Overtemperature error/Overtemperature error mask

Overtemperature warning/Overtemperature warning mask

Overtemperature error release

OTE p. 41/M_OTE p. 40

OTW p. 41/M_OTW p. 40

OTE_RLS p. 40

Signal Monitoring

VSENSE+

Multibit

 ADC

VSENSE–

ISENSE+

ISENSE–

Multibit

 ADC

To Audio/

Data Serial

port

VP (3.0–5.25 V)

Multibit

 ADC

Range Scaling

–30 to +36 dB

6-dB steps

VMON ADC Front End

IMON ADC Front End

IMON_SCALE on p. 38

(PDN_xMON = 0)

CS35L32 датащи(PDF) 19 Page - Cirrus Logic

CS35L32 датащи(HTML) 19 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

датащи скачать

ссылки URL