wm8953 Wolfson Microelectronics plc, wm8953 Datasheet - Page 24
wm8953
Manufacturer Part Number
wm8953
Description
Low Power Stereo Adc With Pll And Tdm Interface Low Power Stereo Adc With Pll And Tdm Interface
Manufacturer
Wolfson Microelectronics plc
Datasheet
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Figure 13 Typical Power up Sequence where DCVDD is Powered before AVDD
Figure 13 shows a typical power-up sequence where DCVDD comes up first. First it is assumed that
DCVDD is already up to specified operating voltage. When AVDD goes above the minimum
threshold, V
chip is held in reset. In this condition, all writes to the control interface are ignored. When AVDD rises
to V
interface may take place.
On power down, where DCVDD falls first, PORB is asserted low whenever DCVDD drops below the
minimum threshold V
Table 1 Typical POR Operation (typical values, not tested)
Notes:
1.
2.
3.
Vpora_on
Vpora_off
Vpord_on
Vpord_off
SYMBOL
pora_on
If AVDD and DCVDD suffer a brown-out (i.e. drop below the minimum recommended operating
level but do not go below V
operation when the voltage is back to the recommended level again.
The chip will enter reset at power down when AVDD or DCVDD falls below V
This may be important if the supply is turned on and off frequently by a power management
system.
The minimum t
specification is guaranteed by design rather than test.
Vpora
, PORB is released high and all registers are in their default state and writes to the control
pora
, there is enough voltage for the circuit to guarantee PORB is asserted low and the
MIN
por
pord_off
period is maintained even if DCVDD and AVDD have zero rise time. This
.
1.52
0.92
TYP
0.6
1.5
0.9
pora_off
MAX
or V
pord_off
UNIT
V
V
V
V
V
) then the chip will not reset and will resume normal
PD, January 2009, Rev 4.0
pora_off
Production Data
or V
pord_off
24
.
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