Datasheet
AD5522 Data Sheet
Rev. E | Page 56 of 64
READBACK OF COMPARATOR STATUS REGISTER
The comparator status register is a read-only register that
provides access to the output status of each comparator pin on
the chip. Table 33 shows the format of the comparator register
readback word.
READBACK OF ALARM STATUS REGISTER
The alarm status register is a read-only register that provides
information about temperature, clamp, and guard alarm events
(see Table 34). Temperature alarm status is also available in any
of the four PMU readback registers.
Table 33. Comparator Status Register (Read-Only)
Bit Bit Name Description
23 (MSB) MODE1 0
22 MODE0 1
Comparator Status Register-Specific Bits
21 CPOL0 Comparator output conditions per channel corresponding to the comparator output pins.
1 = PMU comparator output is high.
0 = PMU comparator output is low.
20 CPOH0
19 CPOL1
18 CPOH1
17 CPOL2
16 CPOH2
15 CPOL3
14 CPOH3
13 to 0 (LSB) Unused
readback bits
Loads with zeros.
Table 34. Alarm Status Register Readback
Bit Bit Name Description
23
(MSB)
MODE1 1
22 MODE0 1
Alarm Status Register-Specific Bits
21
LTMPALM
TMPALM
corresponds to the open-drain
TMPALM
output pin that flags a temperature event exceeding the default
or user programmed level. The temperature alarm is a per-device alarm; the latched (
LTMPALM
) and unlatched
(
TMPALM
) bits indicate whether a temperature event occurred and whether the alarm still exists (that is, whether
the junction temperature still exceeds the programmed alarm level). To reset an alarm event, the user must write a
1 to the clear bit (Bit 6)
in the PMU register.
20
TMPALM
19
LG0
LGx
is the per-channel latched guard alarm bit, and
Gx
is the unlatched guard alarm bit. These bits indicate which
channel flagged the alarm on the open-drain alarm pin,
CGALM
, and whether the alarm condition still exists.
18
G0
17
LG1
16
G1
15
LG2
14
G2
13
LG3
12
G3
11
LC0
LCx
is the per-channel latched clamp alarm bit, and
Cx
is the unlatched clamp alarm bit. These bits indicate which
channel flagged the alarm on the open-drain alarm pin
CGALM
and whether the alarm condition still exists.
10
C0
9
LC1
8
C1
7
LC2
6
C2
5
LC3
4
C3
3 to 0
(LSB)
Unused
readback
bits
Loads with 0s.