AS8221
Data Sheet - Detailed Description
8.8 System Description
Figure 9. State Diagram
EN=0 WHILE (STBN=1)
EN=1 WHILE (STBN=1)
NORMAL
Input: Output:
EN = 1 INH1 = 1
STBN = 1 INH2 = 1
RECEIVE ONLY
Input:
Output:
EN = 0 INH1 = 1
STBN = 1 INH2 = 1
UV_VCC
EN=0 WHILE (STBN=0)
GO-TO-SLEEP
STANDBY
OR
UV_VCC
WAKE WHILE (EN=0 AND STBN=0)
Input:
Output:
Input:
Output:
OR
EN = 1 INH1 = 1
STBN = 0 INH2 = float
EN = 0 INH1 = 1
STBN = 0 INH2 = float
UV_VCC WHILE (EN=0 AND STBN=0)
OR
EN=1 WHILE (STBN=0)
VREC_VCC WHILE (EN=0 AND STBN=0)
OR
OR
WAKE WHILE (EN=1 AND STBN=0)
OR
WHILE (UV_VCC
)
VREC_VCC WHILE (EN=1 AND STBN=0)
Timer = tSLEEP
POWER OFF
SLEEP
Output:
EN = x INH1 = float
STBN = 0 INH2 = float
STBN=1 WHILE (EN=0)
OR
Input:
UV_VBAT WHILE (UV_VCC
OR
)
WAKE WHILE (EN=0 AND STBN=1)
OR
VREC_VBAT WHILE (EN=0 AND STBN=1)
OR
UV_Vcc WHILE (UV_VBAT
)
VREC_VIO WHILE (EN=0 AND STBN=1)
UV_VBAT THEN (RESET_WAKE)
OR
UV_VIO THEN (RESET_WAKE)
From any State
(except Power Off)
(EN=0 OR EN=1)
OR
(STBN=1 OR STBN=0) WHILE (UV_VBAT OR UV_VIO
)
OR
UV_VBAT OR UV_VIO OR UV_VCC
OR
VREC_VCC
Note: This state diagram does not include all transitions, which are shown in Table 7
Prefix of “WHILE” is an event and suffix in brackets checks the flags or in case of EN and STBN the input condition. For example: VREC_VBAT
WHILE (EN=0 AND STBN=0)
After the event VBAT supply voltage recovery is detected, the transition is performed if EN and STBN are “low”.
Legend:
UV_VBAT: Undervoltage event and/or flag for VBAT supply voltage
UV_VIO: Undervoltage event and/or flag for VIO supply voltage
UV_VCC: Undervoltage event and/or flag for VCC supply voltage
VREC_VBAT: Voltage recovery event and/or flag for VBAT 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
Wake: Wake event and/or flag
www.austriamicrosystems.com/flexray/AS8221
Revision 1.1
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