AS3701 datasheet(33/110 Pages) AMSOSRAM

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AS3701 − Detailed Description – Power Management Functions

Figure 38:

Capacitor Selection for VUSB, VSUP_CHG and VBAT

Selection of Bypass Capacitors for the Pins VUSB,

VSUP_CHG and VBAT

In most applications using the ideal capacitance values shown

in the table and the application schematic are recommended.

After evaluation of the voltage signals on these pins with real

system operational conditions at the user’s application circuit,

the user can determine if this ideal capacitance values needs to

be adjusted.

It must be kept in mind that the capacitance value depends

strongly on the rated voltage, therefore a selection of the

appropriate nominal capacitor value related to the capacitor

size is mandatory to achieve best performance under the

specific operational voltage and load current condition of the

application system.

Current Sinks

The following description of the Current Sinks refers only to the

pins GPIO1_CURR1 and GPIO2_CURR2. Hence the suffix “X”

stands either for 1 or for 2.

The AS3701 contains 2 GPIO pins (GPIO1_CURR1 and GPIO2_

CURR2), providing general purpose current sinks when the

to this setting, the register gpioX_iosf [GPIOXcontrol] must be

set to one of the GPIO output functions (please see the GPIO

section in the following chapter “Detailed Description – System

Functions”).

Symbol

Parameter

Note

Min

Typ

Max

Unit

CVUSB

Input capacitor

Ceramic X5R or X7R

μF

CVSUP_CHG

Output capacitor

Ceramic X5R or X7R

μF

CVBAT

Output capacitor

Ceramic X5R or X7R

μF

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