STA321 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA321' PDF : 157 Pages View PDF
STA321
Power-up and power-down sequences
4.3
Hardware power-down mode
The hardware power-down is obtained by asserting pin STBY to high.
There are two power-down options available, namely mild mode and full (or deep) mode,
that could be selected using the DC_STBY_EN signal in register STBY_MODES
Figure 8 summarizes the main power-down sequence. “Power on” is the normal operating
status where all the startup procedures have already been executed. The rectangular boxes
indicate the steps to be done by the user whilst the rounded boxes indicate the steps done
by the device.
Figure 8. Hardware power-done sequence
Power on
I2C programming
register
STBY_MODES
bits:
CMP_EN_N
DC_STBY_EN
YES
CMP_EN_N = 1 ?
NO
Comp Cell Pwdn
Pin STBY <= 1'
Embedded amp.
CMOS bridge
Powerdown
CLK_I2C off
CLK_ADC off
CLK Core off
PLL power down
YES
DC_STBY_EN = 1 ?
NO
DC Reg. Stby
Power-down mode
Doc ID 15351 Rev 3
23/157
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