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Revision 1.11
77 - 91
AS3543 3v2
Data Sheet - R e g i s t e r D e f i n i t i o n
Table 79. SYSTEM Register
Name
Base
Default
SYSTEM
2-wire serial
41h
Offset: 20h
SYSTEM Register
This register is reset at a AVDD27-POR.
Bit
Bit Name
Default
Access
Bit Description
7:4
Design_Version<3:0>
0100
R
AFE number to identify the design version
0100: for chip version 3v0
3
HB_WD_ON
0
R/W
Heartbeat (HBT) Watchdog
The watchdog counter will be reset by a rising edge at the
HBT input pin which has to occur at least every 500ms. If the
watchdog counter is not reset, the AFE will be powered down.
0: HBT watchdog is disabled
1: HBT watchdog is enabled
2
JTEMP_OFF
0
R/W
Junction temperature supervision (level can be set in register
21h)
0: temperature supervision enabled
1: temperature supervision disabled
1
I2C_WD_ON
0
R/W
2-wire serial interface watchdog
To reset the watchdog counter a 2-wire serial read operation
has to be performed at least every 500ms. If the watchdog
counter is not reset, the AFE will be powered down.
0: watchdog is disabled
1: watchdog is enabled
0
PWR_HOLD
0
R/W
0: power up hold is cleared and AFE will power down
1: is automatically set to on after power on
Table 80. SUPERVISOR Register
Name
Base
Default
SUPERVISOR
2-wire serial
00h
Offset: 21h
SUPERVISOR Register
This register is reset at a AVDD27-POR.
Bit
Bit Name
Default
Access
Bit Description
7
SD_TIME
0100
R/W
Sets the emergency shut-down time invoked by PWRUP.
0: 5.4sec
1: 10.9sec
6
BVDDlow_SD_OFF
0
R/W
0: BVDDlow shut down enalbed
1: BVDDlow shut down disabled
5
-
0
n/a
4:0
JTEMP_SUP<4:0>
0
R/W
Sets the threshold for junction temperature emergency
shutdown and junction temperature interrupt
Invoke shutdown at: JTemp_SD=140-JTEMP_Sup*5
°C
Invoke interrupt at: JTemp_IRQ=120-JTEMP_Sup*5
°C
ams
AG
Technical
content
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valid