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AS3412 데이터시트(PDF) 43 Page - ams AG

부품명 AS3412
상세설명  The AS3412 is a speaker driver with Ambient Noise Cancelling
PDF  84 Pages
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제조업체  AMSCO [ams AG]
홈페이지  http://www.ams.com
Logo AMSCO - ams AG

AS3412 데이터시트(HTML) 43 Page - ams 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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