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18 DS963F4
CS35L32
4.5 Undervoltage Lockout (UVLO)
4.5 Undervoltage Lockout (UVLO)
If the VP level falls below the lockout threshold specified in Table 3-3, UVLO protection shuts down all analog circuitry of
the CS35L32. Autorecovery occurs as VP rises above the lockout threshold by a voltage equal to the specified hysteresis.
During a UVLO condition, control port, UVLO detection, serial clock, watchdog, and thermal detection circuitry stay active.
Note: During an UVLO condition, the I
2
S port is automatically powered down, preventing the UVLO condition from being
fed back via the ADSP SDOUT pin.
4.6 Boost Converter
The CS35L32's boost converter, shown in Fig. 4-3, delivers power to the supply of the audio speaker amplifier as well as
to the LEDs. Its output voltage is determined by VBOOST_MNG (see p. 38). Section 4.10 further shows how VBOOST_
MNG relates to audio and LED operation. The boost converter features a current-limiting circuit that detects and clamps
peak inductor current if such a peak is equal to the user-programmable limit (BST_IPK, see p. 38). BOOST_CURLIM
interrupt flag is set when the current limit has been detected.
MCLK
INT
sets the frequency of the converter to 2 MHz. MCLK
INT
is derived from MCLK by setting MCLKDIV2 (see p. 37).
If MCLK
INT
stops switching, the converter is placed in Bypass Mode until clocking is restored.
Figure 4-3. Boost Controller Block Diagram
4.7 Die Temperature Monitoring
Onboard die temperature monitoring prevents, shown in Fig. 4-4, the CS35L32 from reaching a temperature that would
compromise reliability or functionality. The CS35L32 incorporates a two-threshold thermal-monitoring system. When die
temperature exceeds the lower threshold, an overtemperature warning (OTW) event occurs; if it exceeds the second
threshold, an overtemperature error (OTE) condition occurs. These conditions are described in Section 4.7.1.
Figure 4-4. Die Temperature Monitoring
Note: The CS35L32 does not support independent powering down of die-temperature monitoring circuitry (other than
powering it down via PDN_ALL, see p. 36).
Boost Converter
VP VBST
VP SW
Rectifying FET
GNDP
Boost Controller
2-MHz Clock
Set
Reset
Pulse
Width
Control
R
BST_SNS
IREF
GEN
V
BANDGAP
Internal
Reference
Circuitry
IREF+
C
BST(OUT)
C
BST(IN)
Boost
FET
L
BST
BST_IPK
on p. 38
Die Temperature Monitoring
Temperature
Sensor
VA
V
BANDGAP
Overtemperature Error Reference (T
OP
)
V
BANDGAP
Overtemperature Warning Reference (T
WRN
)
OTW on p. 41
M_OTW on p. 40
(see Section 4.7.1)
OTE on p. 41
M_OTE on p. 40
OTE_RLS on p. 40
(see Section 4.7.1)
- Audio Input and Gain 1
- Flash LED Drivers 1
- General Description 2
- Table of Contents 4
- 1 Pin Descriptions 5
- 6 DS963F4 6
- 2 Typical Connection Diagram 7
- 8 DS963F4 8
- Table 3-3. DC Characteristics 8
- DS963F4 9 9
- 10 DS963F4 10
- DS963F4 11 11
- OPERATING 12
- = “S” or “M” 13
- 4 Functional Description 15
- 4.3 Speaker Amplifier 16
- 4.4 Low-Battery Management 17
- 4.6 Boost Converter 18
- 4.8 Signal Monitoring 19
- 4.8.3.2 IMON Sense Resistor 20
- Flash LED Current Drivers 21
- 4.10 Power Budgeting 23
- LRCK SCLK 24
- LRCK SCLK SDOUT 24
- 4.11.3 ADSP in I 25
- 4.11.3.1 Data Bit Depths 25
- 4.12 Signaling Format 26
- DS963F4 27 27
- 4.13 Device Clocking 29
- 4.14 Control Port Operation 30
- 1 0 0 0 0 0 x 1 31
- 5 Applications 32
- 5.5 Inductor Selection 34
- 6 Register Quick Reference 35
- 7 Register Descriptions 36
- 7.6 Power Control 2 37
- 7.7 Clocking Control 37
- 7.8 Low Battery Thresholds 37
- 7.9 Battery Voltage Monitor 38
- 7.11 Scaling 38
- 7.13 ADSP Control 39
- 7.16 Interrupt Mask 1 40
- 7.17 Interrupt Mask 2 40
- 7.18 Interrupt Mask 3 41
- 42 DS963F4 42
- 7.22 LED Lighting Status 43
- 7.23 LED Flash Mode Current 43
- 7.24 LED Movie Mode Current 44
- 7.25 LED Flash Timer 44
- 8 Typical Performance Plots 45
- 46 DS963F4 46
- VBST = 5 V 47
- VBST = VP 47
- 48 DS963F4 48
- 9 Parameter Definitions 49
- 10 Package Dimensions 50
- 11 Thermal Characteristics 50
- 12 Ordering Information 50
- 13 References 51
- 14 Revision History 51
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