ACS8522AT View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
ACS8522AT Datasheet PDF : 118 Pages
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ACS8522A SETS LITE
ADVANCED COMMS & SENSING
Address (hex): 4D
FINAL
DATASHEET
Register Name cnfg_DPLL_soft_limit
Description
(R/W) Register to program the Default Value
soft frequency limit of the two
DPLLs. Exceeding this limit will
have no effect beyond triggering a
flag.
1000 1110
Bit 7
freq_lim_ph_
loss
Bit 6
Bit 5
Bit 4
Bit 3
DPLL_soft_limit_value
Bit 2
Bit 1
Bit 0
Bit No.
Description
Bit Value Value Description
7
[6:0]
freq_lim_ph_loss
Bit to enable the phase lost indication when the
DPLL hits its hard frequency limit as programmed in
Reg. 41 and Reg. 42 (cnfg_DPLL_freq_limit). This
results in the DPLL entering the phase lost state any
time the DPLL tracks to the extent of its hard limit.
DPLL_soft_limit_value
Register to program to what extent either of the
DPLLs tracks a source before raising its soft
frequency alarm flag (Bits 5 and 4 of Reg. 09,
sts_operating). This offset is compared to the
crystal oscillator frequency taking into account any
programmed calibration.
0
Phase lost/locked determined normally.
1
Phase lost forced when DPLL tracks to hard limit.
-
To calculate the ppm offset multiply this 7-bit value
by 0.628 ppm. The limit is symmetrical about zero.
A value of 0001110 bin is equivalent to ±8.79 ppm.
Address (hex): 50
Register Name cnfg_upper_threshold_0
Description
(R/W) Register to program the
activity alarm setting limit for
Leaky Bucket Configuration 0.
Default Value 0000 0110
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Leaky Bucket Configuration upper_threshold_0_value
Bit 1
Bit 0
Bit No.
Description
Bit Value Value Description
[7:0]
upper_threshold_0_value
The Leaky Bucket operates on a 128 ms cycle. If,
during a cycle, it detects that an input has either
failed or has been erratic, then for each cycle in
which this occurs, the accumulator is incremented
by 1, and for each period of 1, 2, 4, or 8 cycles, as
programmed in Reg. 53 (cnfg_decay_rate_0), in
which this does not occur, the accumulator is
decremented by 1.
When the accumulator count reaches the value
programmed as the upper_threshold_0_value, the
Leaky Bucket raises an input inactivity alarm.
-
Value at which the Leaky Bucket will raise an
inactivity alarm.
Revision 1.00/September 2007 © Semtech Corp.
Page 75
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