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0W633-001-XTP Datasheet(PDF) 12 Page - ON Semiconductor

Part No. 0W633-001-XTP
Description  High-Performance Programmable Audio Processing System
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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0W633-001-XTP Datasheet(HTML) 12 Page - ON Semiconductor

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BELASIGNA 250
http://onsemi.com
12
Internal Power Supplies
Power management circuitry in BELASIGNA 250 generates separate digital (VDDC) and analog (VREG, VDBL) regulated
supplies. Each supply requires an external decoupling capacitor, even if the supply is not used externally. Decoupling capacitors
should be placed as close as possible to the power pads. Further details on these critical signals are provided in Table 5.
Non−critical signals are outlined in Table 6.
Table 5. CRITICAL SIGNALS
Pin Name
Description
Routing Guideline
VBAT
Power supply
Place 1
mF (min) decoupling capacitor close to pin. Connect
negative terminal of capacitor to DGND plane.
VREG, VDBL
Internal regulator for analog sections
Place separate 1
mF decoupling capacitors close to each pin. Con-
nect negative capacitor terminal to AGND. Keep away from digital
traces and output traces. VREG may be used to generate micro-
phone bias. VDBL shall not be used to supply external circuitry.
AGND
Analog ground return
Connect to AGND plane.
VDDO / VDDC
Internal regulator for digital sections
(pads and core)
Place 10
mF decoupling capacitor close to pin. Connect negative
terminal of capacitor to DGND.
GNDO / GNDC
Digital ground return (pads and core)
Connect to digital ground.
AI0, AI1 / LOUT,
AI2, AI3
Microphone inputs
Keep as short as possible. Keep away from all digital traces and
audio outputs. Avoid routing in parallel with other traces. Connect
unused inputs to AGND.
AIR
Input stage reference voltage
Connect to AGND. If no analog ground plane, should share trace
with microphone grounds to star point.
AO0, AO1
Analog audio output
Keep away from microphone inputs.
RCVR0+, RCVR0−,
RCVR1+, RCVR1−
Direct digital audio output
Keep away from analog traces, particularly microphone inputs.
Route corresponding traces as differential pair; route parallel to each
other and approximately the same length.
AOR
Output stage reference voltage
Connect to star point. Share trace with power amplifier (if present).
RCVRGND
Output stage ground return
Connect to star point. Keep away from analog inputs.
EXT_CLK
External clock input / internal clock
output
Minimize trace length. Keep away from analog signals. If possible,
surround with digital ground.
AI_RC
Infrared receiver input
If used, minimize trace length to photodiode.
Not available on the CABGA option
Table 6. NON−CRITICAL SIGNALS
Pin Name
Description
Routing Guideline
CAP0, CAP1
Internal charge pump − capacitor connection
Place 100 nF capacitor close to pins
DEBUG_TX, DEBUG_RX
Debug port
Not critical − Connect to test points
TWSS_SDA, TWSS_CLK
TWSS port
Not critical
GPIO[14..0]
General−purpose I/O
Not critical
GPIO[15]
General−purpose I/O
Determines voltage mode during boot. For 1.8 V
operation, should be connected to DGND.
Not critical
UART_RX, UART_TX
General−purpose UART
Not critical
PCM_FRAME, PCM_CLK,
PCM_OUT, PCM_IN
Pulse code modulation port
Not critical − Keep away from analog signals.
I2S_INA, I2S_IND, I2S_FA,
I2S_FD, I2S_OUTA, I2S_OUTD
I2S compatible port
Not critical
UCLK
Programmable clock output
Not critical −
If used, keep away from analog inputs/outputs
LSAD[5..0]
Low−speed A/D converters
Not critical
SPI_CLK, SPI_CS,
SPI_SERI, SPI_SERO
Serial peripheral interface port
Connect to EEPROM
Not critical


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