40
5.2
Power Supply
CW6632B Bluetooth 3.0 Audio Player SOC
Version 1.0.0
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TO enter IDLE mode, user need to write a „1‟ to IDLE register (Bit2 of PCON0).
When exit IDLE mode, CW6632B will enter interrupt service subroutine if EA is enable. If EA is disabled, the
instruction next to IDLE will be executed.
5.1.4
Power Down Mode
Power Down mode will disable core 1.2V and VDDIO 3.3V power, all the IO state, RAM, MROM and logic will be
power off. The content in RAM and logic disappears, should be initial after wake up.
Enter power down mode:
1) Disable the entire analog model
2) Select wake up source in WK_EN
3) Disable RC, RVDD, VDD1P8, VDD3P3, PMU, in PWRCON (RTC power field); RCEN, RVDD_EN, DVDD_EN,
VDDIO_EN, PMU_EN
Power down mode wake up source:
1) RTC alarm wake up
2) RTC WKO pin wake up
3) RTC every minute wake up
4) RTC every day wake up
NOTE: After exit Power Down mode by wakeup, the device will be reset.
5.2
Power Supply
CW6632B provides two on-chip low drop-out regulators (LDO) to convert from 5V to 3.3V, 2.1V to 1.8V for internal
core power use. It is there to provide high power supply noise rejection and also to minimize power consumption.
LDO is always enabled.
CW6632B also provides Build-in buck converter, DC-DC 5V to 1.5V
To provide a more stable and reliable power source to internal core logic, it is recommended to add frequency
compensation through external component.
Note:
The recommended value for L0 is 10 uH.
The recommended value for C0 is 10 uF.
The recommended value for C1 is 10 uF.
The recommended value for C2 is 10 uF.
The recommended value for C3 is 10 uF.
L0, Cx should be placed closely to the chip.
LDO enable and current select configure, please refer to
“Register 5-x PWRCONx – Power control”
Register 5-1 PWRCON1
– Power control 1
Position
7
6
5
4
3
2
1
0
Name
DB1MODE1 DB1MODE0 DB1TB2
DB1TB1
DB1TB0
DZISEL2
DZISEL1
DZISEL0