Specifications

GOODOCOM Technologies Confidential GOC-BA440 Specification
GOODOCOM Technologies Confidential 12
6. External LPO_CLK Signal Requirement
Parameter LPO Clock Units
Nominal input frequency
32.768
kHz
Frequency accuracy
±200
ppm
Duty cycle
30–70
%
Input signal amplitude
200–3300
mV, p-p
Signal type
Square wave or sine wave
–
Input impedancel
a
>100k
Ω
<5
pF
Clock jitter
<10,000
ppm
a:When power is applied or switched off.
Table 3: External LPO_CLK Signal Requirement
7.Echo cancellation principle
Figure5: Sound processing flow chart
The left picture is a schematic diagram of the echo cancellation principle. After Decodec decoding of the
left and right channel sound, after data sampling and master MIC data comparison, echo cancellation can be
processed. The right picture is a reference example, which can be designed according to the actual plan.
Flying echo cancellation design, priority to use the echo cancellation design of IFLYTEK.
8.Power-Up Sequence and Timing
8.1 Sequencing of Reset and Regulator Control Signals
The GOC-BA440 has two signals that allow the host to control power consumption by enabling or
disabling the Bluetooth, WLAN, and internal regulator blocks. These signals are described below.
Additionally, diagrams are provided to indicate proper sequencing of the signals for various operational
states. The timing values indicated are minimum required values; longer delays are also acceptable.
NOTE:
1)The module has an internal power-on reset (POR) circuit. The device will be held in reset for a maximum
of 110 ms after VDDC and VDDIO have both passed the POR threshold. Wait at least 150 ms after VDDC
and VDDIO are available before initiating PCIe accesses.