AS3715 datasheet(64/160 Pages) AMSCO

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Page 64

ams Datasheet, Confidential

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[v1-00] 2014-Sep-10

AS3715 − Detailed Description – System Functions

Internal References

Description

The internal reference is power by the V2_5 always on LDO. It

uses an external capacitor and resistor for filtering and current

setting. In power_off mode the V2_5 stays alive but the

reference will be disabled.

Low Power Mode

Use bit low_power_on to activate the Low Power Mode. In this

mode the on-chip voltage reference and the temperature

supervision comparators are operating in pulsed mode. This

reduces the quiescent current of the AS3715 by 45uA (typ.).

Because of the pulsed function some specifications are not

fulfilled in this mode (e.g. increased noise), but still the full

functionality is available.

For disabling the Low Power Mode low_power_on has to be

cleared via the serial interface.

Parameter

Figure 65:

Reference Parameter

Reference Parameter: Shows the key electrical parameter of the on-chip reference.

Figure 66:

Reference External Components

Reference External Components: Shows the external component parameter of the on-chip reference.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VCEXT

Reference Voltage

Low noise trimmed voltage reference

– connected to Pad CREF; do not load

-1%

1.8

+1%

fCLK

Accuracy of Internal

reference clock

Adjustable by serial interface register

clk_int

-12

fCLK

+12

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

CEXT

External filter capacitor

Ceramic low-ESR capacitor

between CREF and VSS

-10%

100

+10%

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