AS1854 Datasheet, PDF (37/52 Pages) List of Unclassifed Manufacturers – Digital Power PoE PD Controllers

AS1854/44/34/24
Register Descriptions
The AS1854/34 contains 16 single byte (8-bit)
registers. The registers are accessible via the I²C
interface when Software mode is enabled.
Table 22 provides a summary of the AS1854/34
registers and bit functions. Table 23 through Table
38 provides detailed description of the function and
operation
of
each
register.
Table 22 - AS1854/34 Register and Bit Summary
Register
Addr
(hex)
Access
D7
D6
D5
Data Bits
D4
D3
D2
D1
D0
Alarms and
Power Status
00
Read-
Only
Over-
Current
Alarm
Over-
Temp
Alarm
A/D Over-
Threshold
Alarm
Output #4
Fault
Output #3
Fault
Output #2
Fault
Output #1
Fault
Global
PGOOD
Fault
Interrupt
Mask
01
R/W
Over-
Current
Alarm
Over-
Temp
Alarm
A/D Over-
Threshold
Alarm
Output #4
Fault
Output #3
Fault
Output #2
Fault
Output #1
Fault
reserved
Interrupt
Status
02
Read-
Only
Over-
Current
Alarm
Over-
Temp
Alarm
A/D Over-
Threshold
Alarm
Output #4
Fault
Output #3
Fault
Output #2
Fault
Output #1
Fault
Watchdog
Timeout
PGOOD
Voltage
Masks
03
R/W
reserved reserved reserved
Output #4
Mask
Output #3
Mask
Output #2
Mask
Output #1
Mask
reserved
Watchdog
Enable,
Mask,
Service
04
R/W
reserved reserved reserved
Watchdog
Enable
Watchdog
Interrupt
Mask
Watchdog
PGOOD
Mask
Watchdog
Register
Reset
Mask
Watchdog
Service
Control
PGOOD &
Watchdog
History
05
R/W
reserved reserved reserved
Output #4
caused
PGOOD
fault
Output #3
caused
PGOOD
fault
Output #2
caused
PGOOD
fault
Output #1
caused
PGOOD
fault
Watchdog
Timeout
elapsed
Device
Control and
I/O Status
06
R/W
reserved
Reset all
registers
Enable
Interrupts
Disable
PGOOD
reset
reserved reserved
GPOP
GPIP
Watchdog
Timeout
07 R/W
WDOG timeout counter (8 bits, in 125ms increments)
ADCIN
Voltage Read
08
Read-
Only
ADCIN pin input voltage measurement (8 bits)
ADCIN Alarm
Threshold
09
R/W
Alarm Threshold for ADCIN (8 bits)
PD Status &
System Clock 0A
Control
R/W
reserved
LDET
AT_DET
(AS1854/
1844 only)
CLIM
(not valid in
Local Power
mode)
PWM
Clock
Modulate
Enable
PWM
Clock
Modulate
Type
PWM Clock
Modulation
Amount
D1, D0
PD Voltage
Read
0B
Read-
Only
PD input voltage measurement
(Valid during both PoE and Local Power operation modes)
PD Current
Read
0C
Read-
Only
reserved reserved reserved
PD input current measurement
(PoE only, does not measure Local Power current)
PD Over-
Current
Alarm
Threshold
0D R/W reserved reserved reserved
PD over-current alarm trip threshold
Akros Silicon, Inc.
6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA
408.746.9000  http://www.AkrosSilicon.com
37