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Power-Up/-Down Sequence and Reset
T0008-02
V
CC
, V
HP
2.4 V
LRCK, BCK, SCKI
PD
H
OUT
L, H
OUT
R
9334/f
S
9334/f
S
0 V
PCM1770 , PCM1771
SLES011E – SEPTEMBER 2001 – REVISED MARCH 2007
The PCM1770 device has two kinds of power-up/-down methods: the PD terminal through hardware control and
PWRD (register 4, B0) through software control. The PCM1771 device has only the PD terminal through
hardware control for the power-up/-down sequence. The power-up or power-down sequence operates the same
as the power-on or power-off sequence. When powering up or down using the PD terminal, all digital circuits are
reset. When powering up or down using PWRD, all digital circuits are reset except for maintaining the logic
states of the registers. Figure 21 shows the power-up/power-down sequence.
Figure 21. Power-Down and Power-Up Sequences
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