AS3909 Просмотр технического описания (PDF) - austriamicrosystems AG
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AS3909 Datasheet PDF : 77 Pages
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Application Information
By writing Regulated Voltage Definition Register (#16) user
chooses between automatic and “manual” adjustment of
regulated voltage. Automatic mode is chosen when bit reg_s is
0 (default and also recommended state). When bit reg_s is
asserted to 1 regulated voltage is defined by bits rege_3 to
rege_1 of the same register.
Communication to External Microcontroller
The AS3909/10 is a slave device and the external
microcontroller initiates all communication. Communication is
done by a 4-wire Serial Peripheral Interface (SPI). The AS3909/10
asks microcontroller for its attention by sending an interrupt
(pin INTR).
In addition the microcontroller can use clock signal available
on pin MCU_CLK when the oscillator is running.
The microcontroller can also drive pin EN. Putting this pin high
has the same function as setting the Operation Control Register
bit en (entry in Ready mode).
Serial Peripheral Interface (SPI)
For details about SPI timing refer to Figure 8.
Figure 12:
Serial Peripheral Interface (4-wire Interface) Signal Lines
Name
SEN
SDATAI
SDATAO
SCLK
Signal
Digital Input with pull down
Digital Input
Digital Output with tristate
Digital Input
Signal Level
Description
CMOS
SPI Enable
CMOS
Serial Data input
CMOS
Serial Data output
CMOS
Clock for serial communication
AS3909/AS3910 – 22
ams Datasheet, Confidential: 2013-Oct [3-02]
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