STEVAL-CCA018V1 STMicroelectronics, STEVAL-CCA018V1 Datasheet - Page 21

• Manufacturer Part Number: STEVAL-CCA018V1
• Description: EVAL BOARD A/D TS4657
• Manufacturer: STMicroelectronics
• Type: Other Power Managementr

Specifications of STEVAL-CCA018V1

• Design Resources: STEVAL-CCA018V1 BOM STEVAL-CCA018V1 Schematic
• Featured Product: STM32 Cortex-M3 Companion Products
• Main Purpose: Audio, Audio Processing
• Embedded: No
• Utilized Ic / Part: TS4657
• Primary Attributes: I²S, Right- or Left- Justified
• Secondary Attributes: 3 V ~ 5.5 V Supply
• Interface Type: I2C
• Operating Supply Voltage: 3 V to 5.5 V
• Product: Power Management Development Tools
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TS4657
• Other names: 497-10735

TS4657
4.3
4.3.1
4.3.2
Recommended power-up and power-down sequences
Power-up
It is recommended to power-up the TS4657 prior to applying logical data in order to ensure
correct ESD protection biasing.
When the STDBY pin is in a low state (VIL,) the circuit is in standby; when the pin is in a high
state (VIH), the circuit is enabled. An internal pull-down resistor will force the STDBY pin to
ground if no signal is applied to this pin.
The standby signal can be delayed from the power-up phase but simultaneous stimuli are
possible, as shown in
Figure 51. Standby signal delayed from power-up phase
The wake-up time (Twu) of the TS4657 is defined as the time between the settlement of the
digital input signals STDBY, MCLK, BCLK, LRCLK, SDAT and 80% of the VOUTR/VOUTL
amplitude. The Twu of the circuit is typically 4.5 ms.
If all digital input signals are settled and an ON/OFF sequence is applied quickly on the
STDBY pin, the internal capacitors remain charged and the Twu is around 1 ms.
Power-down
As described in
therefore recommended not to switch off the MCLK during normal operation.
To properly power-down the device, MCLK, BCLK and LRCLK should be switched off after
the STDBY signal.
The power-down time is very short and can be considered as zero.
VOUTR VOUTL
VCCA VCCD
MCLK BCLK
LRCLK
STDBY
SDAT
t=0µs min
t=0µs min
Section
Figure
4.2, the MCLK is internally used to supply some blocks. It is
51.
t=0µs min
Twu
80%
Application information
21/26