AS8220A datasheet(14/33 Pages) AMSCO

14 / 33 page

www.austriamicrosystems.com

Revision 17920-001-10a

14 - 33

AS8220A

Objective Data Sheet - Detailed Description

Power On/Off Events

Starting from power off mode a power on event occurs in case undervoltage flag is reset.

Starting from every operation mode a power off event occurs in case VCC undervoltage flag is set.

System Description

Figure 9. State Diagram

Note: In Table 7 the corresponding transition table is shown

Prefix of “WHILE” is always the event and suffix in brackets checks the flags or in case of STBN the input condition.

For example: VREC_VBAT WHILE (STBN=1)

After the event VIO supply voltage recovery is detected, the transition is performed if STBN is “high”.

Legend:

UV_VIO: Undervoltage event and/or flag for VIO supply voltage

UV_VCC: Undervoltage event and/or flag for VCC supply voltage

VREC_VIO: Voltage recovery event and/or flag for VIO supply voltage

VREC_VCC: Voltage recovery event and/or flag for VCC supply voltage

Normal

Standby

Input:

STBN = 1

Input:

STBN = 0

Power Off

_VC

UV_VCC

VREC_VCC

VREC_VIO WHILE (STBN=0)

UV_VCC

AS8220A Datasheet(PDF) 14 Page - ams AG