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AS3412 Arkusz danych(PDF) 44 Page - ams-OSRAM AG

Numer części AS3412
Szczegółowy opis  Ultra Small ANC Speaker Driver
PDF  85 Pages
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Producent  AMSOSRAM [ams-OSRAM AG]
Strona internetowa  https://ams-osram.com/
Logo AMSOSRAM - ams-OSRAM AG

AS3412 Arkusz danych(HTML) 44 Page - ams-OSRAM AG

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ams Datasheet
Page 43
[v1-00] 2016-Apr-06
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AS3412 − Detailed Description
Figure 56:
Production Environment I²C Interface Trimming
I²C Trimming: This block diagram shows a general overview of the production environment when storing the
register settings to the AS3412 using a standard I²C interface.
Timing is important, to avoid latch-up, when using an external
buffer and switching on the ANC device. The timing diagram in
Figure 57 shows that it is important that there is a certain delay
requirement between VBAT and the MODE /CSCL pin. This delay
is mandatory in order to guarantee that the device starts up
properly. The MODE /CSCL pin powers up the ANC device. The
whole sequence to power up the internal charge pump of the
AS3412 takes approximately 1ms. Once VNEG is settled the
external VNEG buffer (e.g. power supply) can be enabled in order
to support the charge pump especially during the trim process.
Charge Pump
CFLY
CVNEG
Power Supply
1.8V
+
-1.8V
-
GND
I2C
OTP Memory
ANC/CSDA
MODE/CSCL
GND
I2C compatible
Hardware
E.g. BT chip, MCU, ...
I2C Clock
I2C Data
Digital Interface Supply Voltage
max. 3.6V
GND
V
Voltage has to be >3.4V for
proper trimming



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